Instruction Manual TCPA300/400 Amplifiers & TCP300/400 Series AC/DC Current Probes 071-1183-03 This document applies for firmware version 1.0 and above. Warning The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to all safety summaries prior to performing service. www.tektronix.
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Warranty 2 Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product.
Table of Contents Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Optional Accessories . . .
Table of Contents Inductance Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuity Test of Multiple-Conductor Cable . . . . . . . . . . . . . . . . . . . . . . . . . . Measuring Inductor Turns Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Measurement and Analysis Software . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-- 13 3-- 15 3-- 16 3-- 17 Troubleshooting and Error Codes . . . . . . . . . . . . . . . .
Table of Contents Adjustment Procedures Adjustment Procedures Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . TCPA300 and TCPA400 Amplifier Adjustments . . . . . . . . . . . . . . . . 6--1 6--3 Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accessing the Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TCPA300 Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents iv TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Table of Contents List of Figures Figure 1--1: Typical TCPA300/400 current measurement system . . . Figure 1--2: Using the probe holders . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 1--3: Equipment locations in the travel case . . . . . . . . . . . . . . Figure 1--4: Connecting and disconnecting a current probe to the amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 1--5: TCP312 and TCP305 slide operation . . . . . . . . . . . . . . .
Table of Contents Figure 4--8: Measuring 750A noncontinuous at 50 °C ambient temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 4--9: Measuring 600A noncontinuous at 50 °C ambient temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 4--10: Measuring 750A noncontinuous at 23 °C ambient temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 5--1: Check LED functionality . . . . . . . . . . . . .
Table of Contents Figure 7--10: Removing the strain relief boot . . . . . . . . . . . . . . . . . . . Figure 7--11: Removing the top half of the probe . . . . . . . . . . . . . . . . Figure 7--12: Removing the probe slide . . . . . . . . . . . . . . . . . . . . . . . . Figure 7--13: Removing the current transformer . . . . . . . . . . . . . . . . Figure 7--14: Removing the circuit board and cable assembly . . . . . Figure 7--15: Removing the handle . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents viii TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Table of Contents List of Tables Table 1--1: Amplifier options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 1--2: Service options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1--3 1--3 Table 3--1: Unpowered circuit degauss limits . . . . . . . . . . . . . . . . . . . Table 3--2: Automobile charging systems test setup . . . . . . . . . . . . . Table 3--3: Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents Table 5--19: DC gain accuracy test worksheet for the TCP303 and TCP404XL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 5--20: Equipment settings for rise time . . . . . . . . . . . . . . . . . . Table 5--21: Equipment settings for bandwidth . . . . . . . . . . . . . . . . . Table 5--22: Bandwidth test for the TCP303 . . . . . . . . . . . . . . . . . . . x 5--35 5--37 5--40 5--41 Table 6--1: Amplifier and probe adjustments . . . . . . . . .
General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. To avoid potential hazards, use this product only as specified. Only qualified personnel should perform service procedures. While using this product, you may need to access other parts of the system. Read the General Safety Summary in other system manuals for warnings and cautions related to operating the system.
General Safety Summary Provide Proper Ventilation. Refer to the manual’s installation instructions for details on installing the product so it has proper ventilation. Symbols and Terms Terms in this Manual. These terms may appear in this manual: WARNING. Warning statements identify conditions or practices that could result in injury or loss of life. CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property. Terms on the Product.
Service Safety Summary Only qualified personnel should perform service procedures. Read this Service Safety Summary and the General Safety Summary before performing any service procedures. Do Not Service Alone. Do not perform internal service or adjustments of this product unless another person capable of rendering first aid and resuscitation is present. Disconnect Power. To avoid electric shock, switch off the instrument power, then disconnect the power cord from the mains power.
Service Safety Summary xiv TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Preface This Instruction Manual supports the operation and basic maintenance of the TCPA300 and TCPA400 Current Probe Amplifiers, and the TCP300/400 Series AC/DC current probes that mate with the amplifiers.
Preface xvi TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Getting Started
Getting Started The TCPA300 and TCPA400 current probe amplifiers let you use one probe to simultaneously measure AC and DC current. The amplifiers convert the sensed current into a proportional voltage signal that you can measure directly with an oscilloscope. The TCPA300 and TCPA400 current probe amplifiers provide better linearity than other current measurement systems because of a current feedback process used with the probe.
Getting Started TCPA300 and TCPA400 Current Probe Amplifiers Current Probes The amplifier amplifies the current sensed by the probe and converts the current to a proportional voltage that is displayed on an oscilloscope or other similar measuring device.
Getting Started Options Table 1--1 lists options that are available for the TCPA300 and TCPA400 amplifiers. Table 1- 1: Amplifier options Option Description A1 Universal Euro power cord A2 United Kingdom power cord A3 Australia power cord A5 Switzerland power cord A6 Japan power cord AC China power cord A99 No power cord L5 Japanese Instruction Manual Table 1--2 lists the Tektronix service options you can order for your amplifiers and probes.
Getting Started Standard Accessories The following accessories are shipped with the amplifiers and probes. Refer to the Replaceable Parts List beginning on page 8--1 for Tektronix part numbers to use in ordering accessories. Amplifiers Probes 1- 4 The following accessories are shipped with the TCPA300 and TCPA400 amplifiers.
Getting Started Optional Accessories You can order the following optional accessories for the amplifiers and probes. Refer to the Replaceable Parts List beginning on page 8--1 for Tektronix part numbers to use in ordering accessories. H One-turn 50 Ω current loop. The current loop is used in the performance verification procedure for checking the performance of the TCPA300 Amplifier and the compatible probes. H CT-4 High-Current Transformer.
Getting Started Probe Covers The TCP300/400 Series Current Probes come with a probe cover that stores the probe when not in use. Use the probe cover to hold your probe in a convenient place at your bench or workstation when you are not using it. You can attach the probe cover to the side of the bench to keep the probe off of your work surface. See Figure 1--2.
Getting Started Travel Case The travel case is a recommended accessory for the TCPA300/400 Amplifiers. The travel case includes room to store one amplifier and two TCP300/400 Series Current Probes, one of each size. (For example, you can store a TCP305 and a TCP303 probe.) A compartment is included to store associated cables and terminations. See Figure 1--3 for the proper location of the equipment.
Getting Started Connecting the Amplifier to an Oscilloscope You will need an oscilloscope to display the TCPA300 and TCPA400 measurement output. To use the full dynamic range of the probe/amplifier combination, the oscilloscope must be capable of displaying a vertical scale factor of 1 mV/div to 1V/div. If you are using a TEKPROBE II-compatible oscilloscope, use the TEKPROBEto-TEKPROBE interface cable.
Getting Started Connecting a Current Probe to the Amplifier To connect a current probe to the amplifier input connector, align the red dot on the probe connector with the red dot on the amplifier front panel, as shown in Figure 1--4. Push the probe connector in to lock the connector. Do not twist the connector. The connector locks into place when you push it all the way into the front panel.
Getting Started Operating the Current Probe Slide The current probes each have a slide mechanism that opens and closes the probe jaw. This allows you to clamp the probe around a conductor under test. The slide must be locked closed to accurately measure current or to degauss the probe. If a probe is unlocked, the PROBE OPEN indicator on the amplifier will light. WARNING. Do not clamp the TCP305 or TCP312 current probes around uninsulated wires. Damage to the probe or personal injury may result.
Getting Started (2) Lock the probe (1) Unlock the probe (1) Release the handle (2) Squeeze the handle (a) Opening the probe (b) Closing and locking the probe Figure 1- 6: TCP303 and TCP404XL slide operation Degaussing and Autobalancing the Current Probe Degaussing the probe removes any residual magnetization from the probe core. Such residual magnetization can induce measurement error. Autobalancing removes unwanted DC offsets in the amplifier circuitry.
Getting Started To degauss and autobalance a current probe, perform these steps: 1. Verify that the current probe is connected to the amplifier. 2. Remove the current probe from the conductor under test. 3. Lock the probe slide closed (see Figures 1--5 and 1--6). 4. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. 5. Wait about five seconds for the degauss procedure to complete. The PROBE DEGAUSS AUTOBALANCE LED glows green when the operation has successfully completed.
Getting Started WARNING. Do not clamp the TCP305 or TCP312 current probes around uninsulated wires. Damage to the probe or personal injury may result. Only use the TCP305 or TCP312 current probes on INSULATED wires. The TCP303 and TCP404XL current probes can be used to measure current on uninsulated wires. However, the circuit must be de-energized when connecting or removing the current probe. 6. Open the probe slide, place the probe around the conductor under test, and then lock the slide.
Getting Started AC Measurements To measure AC current only, and remove the DC component of the current being measured, follow the instructions below. These are identical to the instructions for DC current measurements except that the amplifier coupling in step 2 is set to AC. 1. Verify that the oscilloscope input coupling is set to DC. 2. Verify that the amplifier input coupling is AC, and the input impedance is set to 50 Ω. (The NOT TERMINATED INTO 50 Ω LED is on if impedance is not 50 Ω.) 3.
Operating Basics
Control Summary This section describes the function of each TCPA300 and TCPA400 front panel control and connector. The overview in Figure 2--1 is followed by a detailed description. Some seldom-used functions do not appear in Figure 2--1. These functions are completely discussed in the detailed descriptions that follow Figure 2--1. The PROBE DEGAUSS AUTOBALANCE button removes residual magnetism from the attached current probe. A multi-color LED indicates the status of the degauss circuit.
Control Summary TCPA300 and TCPA400 Controls These front panel controls and indicators are common to both the TCPA300 and TCPA400 current probe amplifiers, unless otherwise indicated. PROBE DEGAUSS AUTOBALANCE Button and Indicator When pressed, this button performs two functions that maximize measurement accuracy. First, the amplifier generates a degauss signal to remove any residual magnetism from the attached current probe.
Control Summary Displaying Error Codes with the Probe Degauss Autobalance Button on page 3--22. NOTE. The NOT TERMINATED INTO 50 Ω LED is on when the amplifier output is not properly terminated into a 50 Ω load. Make sure your amplifier OUTPUT is connected to an oscilloscope input using a 50 Ω BNC cable, and that the oscilloscope input is set to 50 Ω impedance. See Figure 1--1 on page 1--1 for proper cabling.
Control Summary NOT TERMINATED INTO 50 Ω Indicator When lit, this indicator informs you that the TEKPROBE interface cable or BNC cable from the OUTPUT of the amplifier is not connected to a 50 ohm input on the oscilloscope. You need to switch the termination setting on the oscilloscope to 50 Ω, or use a 50 Ω termination on the oscilloscope input. NOTE. NOT TERMINATED INTO 50 Ω is only detected during the DEGAUSS AUTOBALANCE operation.
Control Summary PROBE INPUT Connector OUTPUT Connector All current probes compatible with the TCPA300 and TCPA400 attach at the PROBE INPUT connector, which is a multi-pin female connector. For information about connecting a probe, see Connecting a Current Probe to the Amplifier on page 1--9. The amplifier current measurement output is accessed at the OUTPUT connector, which should be connected to the oscilloscope input.
Control Summary GPIB Operation The TCPA300 and TCPA400 Current Probe Amplifiers do not have direct GPIB connections. However, you can use a computer to control the oscilloscope that the amplifier is connected to, enabling you to change the time and scale factors of your current measurements over the oscilloscope GPIB bus. Refer to your oscilloscope manual for instructions on using the GPIB bus.
Reference
Reference Notes These notes are provided to help you utilize the full potential of the TCPA300 and TCPA400 current probe systems. Degaussing a Probe with an Unpowered Conductor in the Jaws Under almost all conditions, you can degauss your current probe while a conductor of an unpowered circuit is clamped in the jaws. The advantage of degaussing with an unpowered circuit is that any offset from stray DC magnetic fields are compensated.
Reference Notes Measuring Differential Current You can place two conductors in a current probe to provide differential or null current measurement. This avoids the necessity of using two current measurement systems with a differential oscilloscope. WARNING. Do not put more than one uninsulated conductor at a time in the TCP303 or TCP404XL probes. Do not put any uninsulated conductors in the TCP305 or TCP312 probes.
Reference Notes Conductor #2 Conductor #1 Current Current Current probe Figure 3- 1: Measuring differential current and nulls AC and DC Coupling You can couple the signal input to the TCPA300 and TCPA400 with either DC or AC coupling. DC coupling shows the DC and AC measurement components while AC coupling removes the DC component from the displayed signal. When you use AC coupling, make sure that the input DC current does not exceed the probe specifications.
Reference Notes 1. Select the range setting that will display the maximum detail without exceeding the dynamic range of the signal. 2. Adjust the oscilloscope V/div sensitivity (A/div if using the TEKPROBE interface), to display maximum signal detail. Maximum Current Limits Current probes have three maximum current ratings: continuous, pulsed, and Ampere-second product. Exceeding any of these ratings can saturate the probe core, magnetizing the core and causing measurement errors.
Reference Notes Imax Maximum pulsed current Do Not Exceed p Pulse width at 50% Pulse width at 50% 50% 50% Imax c Maximum continuous current 0A (a) Maximum allowable pulse width (b) Maximum allowable pulse amplitude Figure 3- 3: Applying the amp-second product rule Procedure B To determine the maximum allowable pulse amplitude, measure the pulse width at the 50% points (see Figure 3--3b). Divide the Ampere-second (or Amperemicrosecond) specification of your probe by the pulse width.
Reference Notes Measuring Noncontinuous Current with the TCP404XL Probe When you measure a noncontinuous current with the TCP404XL probe, you need to take into consideration several factors to ensure that you make accurate measurements and do not trip the thermal overload circuit. The amplitude and duty cycle of the continuous and noncontinuous current, and the ambient temperature, all affect the maximum amount of time allowed for the measurement, which defines the safe operating area of the probe.
Reference Notes varying duty cycles and levels of continuous current. The ambient temperature in these two examples is kept constant at 50 °C. WARNING. When using the probe near the upper current limit and maximum ambient temperature for extended lengths of time, the probe head surface can become hot to the touch. To prevent injury, keep your hands away from the probe head until it has had time to cool after disconnecting the probe from the circuit.
Reference Notes Extending Current Range You may encounter situations where your measurement exceeds the maximum current rating of the connected probe. This section discusses methods for extending AC and DC current ranges without exceeding specified limits. WARNING. To avoid personal injury or equipment damage, do not exceed the specified electrical limits of the TCPA300 and TCPA400 or any applicable accessories. When using multiple conductors, do not exceed current limits on either conductor.
Reference Notes Current Current Current Current Conductor under test Conductor under test Bucking current supplied by second conductor Current probe Current probe (a) Adding a second conductor Extra turns added to increase bucking current (b) Adding multiple turns Figure 3- 5: Increasing the DC measurement range Extending AC Range You can extend the AC amplitude limit of the TCPA300 by using the Tektronix CT-4 High-Current Transformer.
Reference Notes Increasing Sensitivity If you are measuring DC or low-frequency AC signals of very small amplitudes, you can increase measurement sensitivity of your Current Probe by winding several turns of the conductor under test around the probe as shown in Figure 3--6. The signal is multiplied by the number of turns around the probe. WARNING. Do not put more than one uninsulated conductor at a time in the probe jaws.
Application Notes This section describes some of the typical measurement applications of the TCPA300 and TCPA400 Current Probe Amplifiers: H Automobile Charging Systems H Inductance Measurements H Continuity Test of Multiple-Conductor Cable H Measuring Inductor Turns Count H Power Measurement and Analysis Software Applications Automobile Charging Systems Most automotive charging systems are three-phase alternators with a diode rectifier network.
Application Notes TCP303/404XL + + --- Battery --- Alternator To ground To ground To current probe amplifier Figure 3- 7: Setup for measuring charging current The waveform in Figure 3--8(a) shows the three-phase ripple frequency. The average charge current is approximately 27 A with a minimum peak of approximately 23 A and a maximum peak of approximately 31 A. The waveform shows a continuous cycle with no dropouts, so the alternator circuit appears to be functioning properly.
Application Notes Inductance Measurements You can use the TCPA300 and TCPA400 to measure inductance of coils. Two different methods can be used: one for low-impedance pulse sources and another for high-impedance pulse sources of known value. Low-Impedance Pulse Sources Figure 3--9 shows a measurement setup using a constant-voltage pulse generator of extremely low output impedance. The inductor is connected across the output terminals of the pulse source.
Application Notes Current flow (i) di Time (t) dt Figure 3- 10: Linear current vs. time ramp High-Impedance Pulse Sources If the pulse source has a higher impedance of known resistance, such that the output voltage drops as the current increases, the inductance of a coil can be calculated by the time constant of the charge curve. Figure 3--11 shows the setup diagram, which is similar to the previous example.
Application Notes Resistance L Current flow (i) Pulse generator Inductance Current probe Figure 3- 11: Measuring inductance with a high-impedance source Current flow (i) 100% 63.2% 36.8% 0 τ τ Time (t) Figure 3- 12: High-impedance source current ramp Continuity Test of Multiple-Conductor Cable Single conductors in a multiconductor cable can be tested with the TCPA300 and TCPA400.
Application Notes Measuring Inductor Turns Count To obtain an approximate turns count of an inductor, connect the inductor to a current limited source, as shown in Figure 3--13. Measure the input current on one of the inductor leads, then clamp the current probe around the inductor and note the current value. The number of turns is equal to the ratio of coil current to input current. The accuracy of this method is limited by the current measurement accuracy.
Application Notes TCP303 Current probe Current flow in coil #1 Input current Current flow in coil #2 Figure 3- 14: Turns measurement using reference coil Power Measurement and Analysis Software Power measurement software that is available for some Tektronix oscilloscopes transform your current measurement system into a sophisticated analysis tool that quickly measures and analyzes many different applications, such as: H Power dissipation at switching devices and magnetic components in switching power
Application Notes 3- 18 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Troubleshooting and Error Codes Table 3--3 lists possible problems that you may encounter when measuring current with the TCPA300 and TCPA400. Use this as a quick troubleshooting reference. Table 3- 3: Troubleshooting Problem Remedy Amplifier will not power on Check that the amplifier is plugged into a working AC outlet. Defective amplifier. See HW Troubleshooting on page 7-- 21 to help determine which module is defective, or refer the instrument to qualified service personnel for repair.
Troubleshooting and Error Codes Table 3- 3: Troubleshooting (Cont.) Problem Remedy Degauss takes longer than 10 seconds Probe is attached to an energized circuit. Disconnect probe from circuit and retry. Probe is faulty - Probe transformer (defective Hall device with excessive noise or drift) may cause this symptom. May also be caused by a shorted or open wire in the probe cable assembly.
Troubleshooting and Error Codes Table 3- 3: Troubleshooting (Cont.) Problem Remedy Measurements exhibit excessive noise Current Probe is not locked. Lock the current probe. Current Probe is improperly connected to the amplifier input. Amplifier output is not terminated into 50 Ω load. Set input impedance of oscilloscope to 50 Ω or connect a 50 Ω feed-through termination at the oscilloscope input, not at the amplifier output. Defective current probe transformer.
Troubleshooting and Error Codes Displaying Error Codes with the Probe Degauss Autobalance Button This section describes the error codes that the amplifiers display using the function indicator LEDs. When an internal error condition exists, the amplifiers may generate error codes when you press the PROBE DEGAUSS AUTOBALANCE button. The AC and DC Coupling LEDs will flash alternately to indicate that error codes are being displayed instead of normal conditions.
Troubleshooting and Error Codes Four-- bit error code is displayed here MSB = binary 0010 = code 2 = = a null error in the DC offset occurred LSB Figure 3- 16: Interpreting the error code display Table 3--4 shows the complete list of error codes for the amplifier. Table 3- 4: Amplifier error codes Code Description of error 1 The amplifier detected a probe, but a Disconnect and reattach the probe to the amplifier. valid Hall device was not detected. Power cycle the amplifier.
Troubleshooting and Error Codes Correcting the Cause of an Error Code After interpreting the error code, disconnect the probe from the circuit and degauss the probe again. Take the measurement again. If the error code persists, contact your Tektronix Service Center. Shutdown Error If all LEDs flash at the same time, a shutdown condition exists. If this occurs, turn off the amplifier and disconnect the probe from the circuit under test. Turning off the amplifier clears the error register.
Specifications
Specifications These specifications are valid only under the following conditions: H The probe and amplifier have been calibrated at an ambient temperature of 23 _±5 _C. H The probe and amplifier are operating within the environmental limits described in Table 4--6 on page 4--5 (the operating temperature limits are 0 _C to +50 _C, unless otherwise stated). H The probe and amplifier have had a warm-up period of at least 20 minutes.
Specifications Nominal and Typical Characteristics Nominal and typical characteristics, listed in Table 4--2, are not guaranteed. They are provided to characterize the configuration, performance, or operation of typical probe/amplifier combinations.
Specifications Table 4- 2: Nominal and typical amplifier characteristics (Cont.) Installed probe TCP312 TCP305 TCP303 TCP404XL 1 A/V Range 5 A/V Range 5 A/V Range N/A . . . . . . . DC (continuous) ( ) 5A 25 A 25 A --- . . . . . . . DC (noncontinuous) ( ) N/A N/A N/A --- . . . . . . . RMS ((sinusoidal)) 3.5 A 17.7 A 17.7 A --- . . . . . . .
Specifications Mechanical characteristics of the probes are listed in Table 4--4. Table 4- 4: Probe mechanical characteristics TCP305 and TCP312 TCP303 and TCP404XL . . . . . . . . . . . . . . Length: 20 cm (7.77 inches) 268 cm (10.55 inches) . . . . . . . . . . . . . . Width: 1.6 cm (0.625 inches) 41 cm (1.60 inches) . . . . . . . . . . . . . . Height: 3.2 cm (1.25 inches) 156 cm (6.13 inches) Cable length 1.5 m (5 feet) TCP303: 2 m (6.6 feet) Probe dimensions TCP404XL: 8 m (26.
Specifications Environmental Characteristics The environmental characteristics in Table 4--6 are warranted performance specifications. Unlike the warranted characteristics in Table 4--1, the environmental characteristics are type tested; therefore there are no performance verification procedures provided to test these characteristics. Unless otherwise noted, these characteristics apply to all probes and amplifiers.
Specifications Table 4--7 lists the certifications and compliances for the amplifiers and probes. Table 4- 7: Certifications and compliances Category Standards or description EC Declaration of Conformity EMC Meets intent of Directive 89/336/EEC for Electromagnetic Compatibility.
Specifications Table 4- 7: Certifications and compliances (cont.) Category Standards or description Additional Compliance UL 61010B-1 Safety requirements for electrical equipment for measuring, controlling and laboratory use. IEC61010-1/A2:1995 Safety requirements for electrical equipment for measurement, control, and laboratory use. IEC 61010-2-032:1995 Particular requirements for hand-held current clamps for electrical measurement and test.
Specifications TCP312 derating curve 35 50_C ambient 25_C ambient Peak current (A) 30 25 20 15 10 5 0 1k 10k 100k 1M Frequency (Hz) 10M 100M Figure 4- 2: Frequency derating- TCP312 TCP305 derating curve Peak current (A) 60 50_C ambient 25_C ambient 50 40 30 20 10 0 1k 10k 100k 1M Frequency (Hz) 10M 100M Figure 4- 3: Frequency derating- TCP305 4- 8 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Specifications TCP303 derating curve 250 50_C ambient 25_C ambient Peak current (A) 200 150 100 50 0 100 1k 10k 100k Frequency (Hz) 1M 10 M 100M Figure 4- 4: Frequency derating- TCP303 TCP404XL derating curve 800 50_C ambient 25_C ambient 700 Peak current (A) 600 500 400 300 200 100 0 0 1k 10k 100k Frequency (Hz) 1M 10M Figure 4- 5: Frequency derating- TCP404XL TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual 4- 9
Specifications 1.0 Insertion Z (ohms) TCP312 .1 .01 .001 10k 100k 1M Frequency (Hz) 10M 100M 1M Frequency (Hz) 10M 100M 10M 100M 1.0 Insertion Z (ohms) TCP305 .1 .01 .001 10k 100k 1.0 Insertion Z (ohms) TCP303 .1 .01 .
Specifications TCP312 Max peak pulse vs PW 60 Maximum peak pulse ≤50A Amperes (Peak) 50 500 A*μs 40 Range setting 1 A/V 10 A/V ≤30 A continuous 30 20 Any width 50 A*µs 10 ≤5 A continuous 0 0 5 10 15 20 25 Allowable pulse width (µseconds) TCP305 Max peak pulse vs PW 60 Maximum peak pulse ≤50A Amperes (Peak) 50 500 A*µs Range setting 5 A/V 10 A/V 40 30 Any width ≤25 A continuous 20 10 0 0 5 10 15 Allowable pulse width (µseconds) 20 25 TCP303 Max peak pulse vs PW 600 Range setting
Specifications TCP404XL Maximum Measurement Times Figures 4--8 through 4--10 show the maximum measurement time for the TCP404XL probe, with varying duty cycles and temperatures. For more detail on the relationship between measurement factors, refer to Measuring Noncontinuous Current with the TCP404XL Probe on page 3--6.
Specifications Measuring 750A at 23 _C ambient Maximum measurement time (min) 25 0A Continuous 20 200A Continuous 300A Continuous 15 400A Continuous 10 5 500A Continuous 0 0 10 20 30 Duty cycle (%) 40 50 60 Figure 4- 10: Measuring 750A noncontinuous at 23 °C ambient temperature At 23 degrees ambient temperature, 600 A can be measured continuously with the TCP404XL probe.
Specifications 4- 14 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
WARNING The following servicing instructions are for use only by qualified personnel. To avoid injury, do not perform any servicing other than that stated in the operating instructions unless you are qualified to do so. Refer to all safety summaries before performing any service.
Performance Verification
Performance Verification Overview The Performance Verification tests allow you to demonstrate that the Current Probe Amplifier and Current Probes meet their specified levels of performance. Since the TCPA300 and TCPA400 cannot operate without a current probe, a calibration adapter is used to verify the amplifier(s) separately. The TCPA Calibration Adapter is an optional accessory--see Replaceable Parts for part numbers.
Performance Verification Overview Table 5- 2: Probe performance verification checks (Cont.) Probe DC gain accuracy TCP303 TCP404XL Bandwidth Risetime Test Procedure Conditions These procedures are valid only under the following conditions: H The system has been calibrated at an ambient temperature of 23_ ±5 _C. H The system is operating in an environment whose limits are described in Table 4--6 on page 4--5.
TCPA300 and TCPA400 Performance Verification This section covers the performance verification for the TCPA300 and TCPA400 Current Probe Amplifiers. Refer to the list of equipment required in Table 5--3. Power on the amplifier and test equipment and let them warm up for 20 minutes. Before starting these procedures, photocopy the appropriate test record beginning on page 5--16 to record the performance test results. The recommended calibration interval is one year.
TCPA300 and TCPA400 Performance Verification Making DC Current Loops You need to construct simple current loops to complete some tests for the amplifiers. The current loops are also used in the DC gain accuracy tests for the probes. 5-Turn DC Current Loop Construct the loop using a cylindrical form approximately 3 inches in diameter: 1. Wind exactly 5 turns of #18 coated wire around the form. 2. Scrape about a half-inch of coating off of the ends of the wire. NOTE.
TCPA300 and TCPA400 Performance Verification Front-Panel Display The status and error LEDs on the front panel are illuminated briefly during the amplifier power-on sequence. Verify that all LEDs are functional by doing the following procedure: 1. Power-cycle the amplifier and check that the LEDs shown in Figure 5--1 light briefly. Note that the PROBE DEGAUSS AUTOBALANCE and OVERLOAD LEDs are multi-color: a. The PROBE DEGAUSS AUTOBALANCE LED lights in an orange→red→green sequence. b.
TCPA300 and TCPA400 Performance Verification DC Gain Accuracy Use the following procedure to verify the DC gain accuracy of the amplifier. Test Equipment Setup Refer to Figure 5--2 and set up the test equipment as follows: 1. Connect the output of the amplifier to the DMM: a. Connect a BNC Cable from the amplifier OUTPUT to the 50 Ω precision feedthrough termination. b. Attach the termination to a BNC-to-dual banana adapter. c.
TCPA300 and TCPA400 Performance Verification 3. Make or verify the equipment settings in Table 5--4: Table 5- 4: Equipment settings Digital multimeter Measurement Type Range DC volts Autoranging Current source Voltage Current Output 6V 100 mA Off TCPA300 and TCPA400 amplifier Coupling Procedure DC After the equipment is set up, proceed as follows: 4. Connect the Calibration Adapter to the PROBE INPUT of the amplifier. 5. For each of the Range settings in Table 5--5, perform the following steps: a.
TCPA300 and TCPA400 Performance Verification d. Calculate the %Error between the measured output, M1, and the expected output (VE) %Error as follows: %Error = M1 − VE × 100 VE For example, using an expected output VE of 2.5000 V and a measured output M1 of 2.510, the %Error would be: %Error = 2.5100 − 2.5000 × 100 = + 0.4% 2.5000 NOTE. It is important that the correct polarity be used to calculate the %Error. 6.
TCPA300 and TCPA400 Performance Verification Bandwidth This procedure tests the bandwidth of the TCPA300 and TCPA400 amplifiers. In this test you measure a signal at a relatively low frequency and again at the upper test frequency. The two measurements are compared to verify that the signal amplitude does not fall below a certain limit. Refer to Figure 5--3 when making equipment connections.
TCPA300 and TCPA400 Performance Verification Table 5- 6: Equipment settings for bandwidth check (Cont.) Oscilloscope Record length Coupling Offset Trigger type Trigger mode Trigger position Acquisition mode Number of waveforms to average Measurement type Leveled sine wave generator Frequency Amplitude TCPA300 TCPA400 TCPA300 and TCPA400 Coupling 500 DC 0 V (mid-scale) Edge Auto 50% Average 16 Peak-to-Peak 3 MHz ~3.0 Vp-p 1.0 Vp-p DC 4.
TCPA300 and TCPA400 Performance Verification c. Using the peak-peak measurement capability of the oscilloscope, measure and record the peak-peak reading as M2 in Table 5--7 or Table 5--8 on page 5--11. 9. The system meets the bandwidth specification if the ratio of the signal amplitude at the warranted bandwidth is at least 70% of the signal amplitude at 3 MHz. Using the following calculation, verify system bandwidth: Ꮛ Ꮠ correction factor M 2 > 0.707 M1 10.
TCPA300 and TCPA400 Performance Verification AC Coupling The following test checks that the AC coupling circuit of the amplifier functions properly. First, you measure a square-wave signal in DC coupling mode and record the value, and then switch to AC coupling and measure the signal amplitude.
TCPA300 and TCPA400 Performance Verification Table 5- 9: TCPA300 and TCPA400 AC coupling measurements TEKPROBE Interface cable BNC coaxial cable Amplifier Square wave generator amplitude Vertical gain setting DC coupled amplifier output Minimum AC coupled amplifier output Maximum AC coupled amplifier output Vertical gain setting DC coupled amplifier output Minimum AC coupled amplifier output Maximum AC coupled amplifier output TCPA300 0.5 Vp 200 mA/div 1.00 Ap-- p 1.05 Ap-- p 1.
TCPA300 and TCPA400 Performance Verification Current Overload Test (TCPA300 Only) This test checks the functionality of the TCPA300 current overload detection circuit using the setup shown in Figure 5--6. You set the current source to output the maximum rated current for the probe/amplifier you are testing, and then increase the current source to a level that engages the overload circuit (the OVERLOAD LED is on). Then, you repeat the test at the opposite polarity.
TCPA300 and TCPA400 Performance Verification Table 5- 10: Maximum current ratings for TCPA300-compatible probes Probe model Range Maximum current rating, Amps TCP312 10 A/V ±30 5T ±6 TCP305 10 A/V ±50 5T ±10 TCP303 50 A/V ±2122 50 T ±4.24 Current loop used for test1 Current source output, Amps 1 Refer to page 5- 4 for instructions on making the current loops. 2 The TCP303 is a 150 A RMS probe with a peak current of 212 A. Apply current for only a short amount of time. 5.
TCPA300 and TCPA400 Performance Verification TCPA300 Amplifier Test Record Photocopy this form and use it to record the performance test results. TCPA300 amplifier test record Instrument Serial Number: Temperature: Date of Calibration: Certificate Number: Relative Humidity %: Technician: Performance test Range, A/V Front-Panel Display - 1% +1% 5 - 1% +1% 10 - 1% +1% 50 - 1% +1% 50 (COMP) - 1% +1% 1 .707 ------ 1 (100 MHz) .707 ------ 5 .707 ------ 10 .707 ------ 50 .
TCPA300 and TCPA400 Performance Verification TCPA400 Test Record Photocopy this form and use it to record the performance test results. TCPA400 amplifier test record Instrument Serial Number: Temperature: Date of Calibration: Certificate Number: Relative Humidity %: Technician: Performance test Minimum Front-Panel Display Pass/Fail DC Gain Accuracy (% Error) - 1% +1% Bandwidth .707 ------ TEKPROBE Cable 1050 Ap-p 1500 Ap-p BNC Coax Cable 1.05 Vp-p 1.
TCPA300 and TCPA400 Performance Verification 5- 18 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP305 and TCP312 Performance Verification The test procedures in this section verify warranted specifications and proper performance of the TCP305 and TCP312 current probes, using the TCPA300 Amplifier. Tolerances that are specified in these procedures apply to the amplifier and current probe and do not include test equipment error. Before starting these procedures, photocopy the appropriate test record beginning on page 5--29 to record the performance test results.
TCP305 and TCP312 Performance Verification Required Test Equipment To perform the acceptance tests in this section, you will need the test equipment listed in Table 5--11. The test equipment must meet or exceed the specifications listed. The test procedures may need to be modified if the recommended equipment is not used.
TCP305 and TCP312 Performance Verification DC Gain Accuracy This procedure tests the DC gain accuracy of the TCP305 and TCP312 Current Probes. In this test you compare the voltage output of the amplifier to a reference input. This test uses current loops that you make using wire and 3-inch forms. Refer to page 5--4 for instructions on making the current loops. Equipment Connections 1. Using a BNC cable, connect the amplifier OUTPUT to the 50 Ω feedthrough termination.
TCP305 and TCP312 Performance Verification Table 5- 12: Equipment settings for DC gain accuracy (Cont.) Current source Output TCPA300 Coupling Procedure Off DC 1. Do not clamp the current probe around any conductor, but make sure the jaws are locked shut. 2. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for the degauss/autobalance routine to complete before proceeding. The routine is complete when the indicator light turns green. 3.
TCP305 and TCP312 Performance Verification Table 5- 13: DC gain accuracy test for the TCP305 and TCP312 Probe Range TCP305 5 A/V / 10 A/V / TCP312 1 A/V / 10 A/V / Current source output (ADC) Expected output, VE (VAC) ±1.00 A ±1.00 V ±3.00 A ±3.00 V ±5.00 A ±5.00 V ±2.00 A ±1.00 V ±6.00 A ±3.00 V ±10.00 A ±5.00 V ±0.20 A ±1.00 V ±0.60 A ±3.00 V ±1.00 A ±5.00 V ±1.20 A ±0.60 V ±3.60 A ±1.80 V ±6.00 A ±3.00 V M1 (VDC) M2 (VDC) M1- M2 (VDC) % Error, calculated g.
TCP305 and TCP312 Performance Verification Rise Time This procedure measures the rise time of the TCP305 and TCP312 Current Probes. In this test you directly measure the rise time of a step input. Refer to Figure 5--8 when making equipment connections. Test oscilloscope 50 Ω oscilloscope input - use the TekProbe Interface Cable or use a 50 Ω cable. (Add 50 Ω termination here if oscilloscope has only high-impedance input.
TCP305 and TCP312 Performance Verification Table 5- 14: Equipment settings for rise time Oscilloscope Vertical input impedance Vertical scale Time base Record length Coupling Offset Trigger type Trigger mode Trigger position Acquisition mode Number of waveforms to average Measurement type Procedure 50 Ω 200 mA/division 2 ns/division 500 DC 0 V (mid-scale) Edge Auto 50% Average 32 Rise Time High amplitude pulse generator Amplitude Maximum TCPA300 Coupling Range TCP305 TCP312 DC 5A/V 1A/V 1.
TCP305 and TCP312 Performance Verification The system rise time (tr system) is the rise time of the displayed signal when output of the pulse generator is connected directly to the oscilloscope input. (The current probe and amplifier are excluded.) 7. Verify that the probe rise time is less than the warranted specification listed in the test record. 8. Record the results on the test record. 9. Disconnect the probe from the pulse generator.
TCP305 and TCP312 Performance Verification Equipment Settings Make or verify the equipment settings in Table 5--15.
TCP305 and TCP312 Performance Verification Table 5- 16: Bandwidth test for the TCP305 and TCP312 Oscilloscope vertical gain TCPA300 output w/TEKPROBE cable w/BNC cable w/TEKPROBE cable w/BNC cable TCP305 5 A/V 10 mA/div 2 mV/div ~60 mA p-- p ~12 mV p-- p 50 MHz TCP312 1 A/V 10 mA/div 10 mV/div ~60 mA p-- p ~60 mV p-- p 100 MHz Probe 1 Range M1 @3 MHz ref freq BW freq M2 @ warranted BW freq Calculation1 Use the formulas in step 9 on page 5- 28. 7.
TCP305 and TCP312 Performance Verification TCP305 Current Probe Test Record Photocopy this form and use it to record the performance test results. TCP305 test record Instrument Serial Number: Temperature: Date of Calibration: Certificate Number: Relative Humidity %: Technician: Performance test Range, A/V Test current, A Minimum DC Gain Accuracy (% Error) 5 A/V / 1.00 A - 3% +3% 3.00 A - 3% +3% 5.00 A - 3% +3% 2.00 A - 3% +3% 6.00 A - 3% +3% 10.
TCP305 and TCP312 Performance Verification TCP312 Current Probe Test Record Photocopy this form and use it to record the performance test results. TCP312 test record Instrument Serial Number: Temperature: Date of Calibration: Certificate Number: Relative Humidity %: Technician: Performance test Range, A/V Test current, A Minimum DC Gain Accuracy (% Error) 1 A/V / 0.20 A - 3% +3% 0.60 A - 3% +3% 1.00 A - 3% +3% 1.20 A - 3% +3% 3.60 A - 3% +3% 6.
TCP303 and TCP404XL Performance Verification The test procedures in this section verify warranted specifications and proper performance of the TCP303 and TCP404XL Current Probes, using the appropriate amplifier. Tolerances that are specified in these procedures apply to the amplifier and current probe and do not include test equipment error. Before starting these procedures, photocopy the appropriate test record beginning on page 5--42 to record the performance test results.
TCP303 and TCP404XL Performance Verification Equipment Required To perform the acceptance tests in this section, you will need the test equipment listed in Table 5--17. The test equipment must meet or exceed the specifications listed. The test procedures may need to be modified if the recommended equipment is not used.
TCP303 and TCP404XL Performance Verification DC Gain Accuracy This procedure tests the DC gain accuracy of the TCP303 and TCP404XL. In this test you compare the voltage output of the amplifier to a reference input. This test uses a 50-turn current loop that you make using wire and a 3-inch form. Refer to page 5--4 for instructions on making the current loop. Equipment Connections 1. Using a BNC cable, connect the amplifier OUTPUT to the 50 Ω feedthrough termination.
TCP303 and TCP404XL Performance Verification Procedure 1. Do not clamp the current probe around any conductor, but make sure the jaws are locked shut. 2. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for the degauss/autobalance routine to complete before proceeding. The routine is complete when the indicator light turns green. 3. Clamp the current probe around the 50 turn current loop, as shown in Figure 5--10 on page 5--33.
TCP303 and TCP404XL Performance Verification 5. Record the results on the test record. Table 5- 19: DC gain accuracy test worksheet for the TCP303 and TCP404XL Probe Range Current source output (ADC) TCP303 5 A/V / ±0.100 A ±1.00 V ±0.300 A ±3.00 V ±0.500 A ±5.00 V ±0.600 A ±0.600 V ±1.80 A ±1.80 V ±3.00 A ±3.00 V ±3.00 A ±0.150 V ±9.00 A ±0.450 V ±15.00 A ±0.750 V 50 A/V / TCP404XL 1 A/mV / Expected output, VE (VAC) M1 (VDC) M2 (VDC) M1- M2 (VDC) % Error, calculated 6.
TCP303 and TCP404XL Performance Verification Rise Time This procedure measures the rise time of the TCP303 and TCP404XL Probes. In this test you directly measure the rise time of a step input. Refer to Figure 5--11 when making equipment connections. High amplitude pulse generator Test oscilloscope Current probe 50 Ω oscilloscope input - use the TekProbe Interface Cable or use a 50 Ω cable. (Add 50 Ω termination here if oscilloscope has only high-impedance input.
TCP303 and TCP404XL Performance Verification Equipment Settings Make or verify the equipment settings in Table 5--20: Table 5- 20: Equipment settings for rise time Oscilloscope Vertical scale: TCP303 200 mA/division TCP404XL 1 A/division Vertical input impedance Time base: TCP303 TCP404XL Record length Coupling 20 MHz BW limit: TCP303 TCP404XL Offset Trigger type Trigger mode Trigger position Acquisition mode Number of waveforms to average Measurement type Procedure 50 Ω 10 ns/division 80 ns/divisi
TCP303 and TCP404XL Performance Verification a. If you are testing a TCP303, clamp the current probe around the HF current loop. Verify that the arrow-shaped indicator on the probe points away from the pulse generator. b. If you are testing a TCP404XL, clamp the current probe around the built--in current loop on the pulse generator. Verify that the arrow-shaped indicator on the probe points away from the output terminal on the pulse generator. 4.
TCP303 and TCP404XL Performance Verification Bandwidth (TCP303) This procedure tests the bandwidth of the TCP303 Current Probe. In this test you measure a signal at a relatively low frequency and again at the rated bandwidth of the probe. The two measurements are compared to verify that the signal amplitude does not fall below --3 dB at the probe bandwidth. Refer to Figure 5--12 when making equipment connections.
TCP303 and TCP404XL Performance Verification Equipment Settings Make or verify the equipment settings in Table 5--21.
TCP303 and TCP404XL Performance Verification Table 5- 22: Bandwidth test for the TCP303 Probe Range TCP303 5 A/V 1 TEKPROBE cable BNC cable Oscilloscope vertical Gain TCPA300 output Oscilloscope vertical gain TCPA300 output 10 mA/div ~60 mA p-- p 2 mV/div ~12 mV p-- p M1 @ 3 MHz ref freq M2 @ warranted BW freq (15 MHz) Calculation1 Use the formula in step 9 below. 9. The probe meets the bandwidth specification if the ratio of the signal amplitude at the warranted bandwidth is at least 70.
TCP303 and TCP404XL Performance Verification TCP303 Current Probe Test Record Photocopy this form and use it to record the performance test results. TCP303 test record Instrument Serial Number: Temperature: Date of Calibration: Performance test DC Gain Accuracy1 (% Error) Certificate Number: Relative Humidity %: Technician: Range, A/V Test current, A Minimum 5 A/V / 1 - 3% +3% 3 - 3% +3% 5 - 3% +3% 0.6 - 3% +3% 1.8 - 3% +3% 3.
TCP303 and TCP404XL Performance Verification TCP404XL Current Probe Test Record Photocopy this form and use it to record the performance test results. TCP404XL test record Instrument Serial Number: Temperature: Date of Calibration: Certificate Number: Relative Humidity %: Technician: Performance test Range Test current Minimum DC Gain Accuracy (% Error) 1 A/mV / 3.0 A - 3% +3% 9.0 A - 3% +3% 15.
TCP303 and TCP404XL Performance Verification 5- 44 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Adjustment Procedures
Adjustment Procedures Overview The following procedures describe adjustments to the current probes and amplifiers. Before performing the adjustment procedures, do the following: 1. If you are adjusting an amplifier, remove the outer case to gain access to the adjustments. Refer to Disassembly on page 7--3. Next, attach the calibration adapter to the amplifier. 2. If you are adjusting a probe, attach the current probe to the amplifier. 3.
Adjustment Procedures Overview 6- 2 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCPA300 and TCPA400 Amplifier Adjustments This section covers the adjustments for the TCPA300 and TCPA400 Current Probe Amplifiers. Refer to the list of equipment required in Table 6--2. Required Test Equipment The adjustment procedures require the test equipment listed in Table 6--2. The test equipment must meet or exceed the specifications listed. You may need to modify the test procedures if you do not use the recommended equipment.
TCPA300 and TCPA400 Amplifier Adjustments TCPA300 Amplifier The TCPA300 has four internal adjustments that affect the gain of the amplifier. (The TCPA400 has one adjustment.) Each range has an individual control, except the 1A/V range, which does not have an adjustment. To make adjustments to the amplifier, do the following: 1. Set up the circuit shown in Figure 6--1.
TCPA300 and TCPA400 Amplifier Adjustments TCPA400 only; 25 Ω 25 Ω Comp(5 A/V) 5 Ω Comp (10A/V and 50 A/V) 12.5 Ω (10 A/V) 5 Ω (50 A/V) TCPA300 Adjustments Figure 6- 2: Gain adjustment locations TCPA400 Amplifier The TCPA400 has one internal gain adjustment in the amplifier. To make adjustments to the amplifier, do the following: 1. Set up the circuit shown in Figure 6--1 on page 6--4. 2.
TCPA300 and TCPA400 Amplifier Adjustments 6- 6 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP305 and TCP312 Adjustments The TCP305 and TCP312 Current Probes have one characteristic that is adjustable--DC gain. The following text describes the DC gain adjustment procedure. Tolerances that are specified in these procedures apply to the current probes and do not include test equipment error. Required Test Equipment To perform the adjustment procedure in this section, you will need the test equipment listed in Table 6--5. The test equipment must meet or exceed the specifications listed.
TCP305 and TCP312 Adjustments TCP305 and TCP312 DC Gain Adjustment Use the following procedure to adjust the DC Gain of the TCP305 and TCP312 Probes. Equipment Connections 1. Connect the amplifier OUTPUT to the DMM input using a BNC-to-Dual Banana connector, 50 Ω BNC cable, and a 50 Ω precision feedthrough termination. Do not connect the termination at the amplifier output. 2. Connect the current probe to the amplifier PROBE INPUT connector. 3.
TCP305 and TCP312 Adjustments Current source DMM -- Output + + -- 5 Turns BNC-to-dual banana adapter 50 Ω Precision termination Current probe Current flow 50 Ω Coaxial cable Figure 6- 4: DC gain adjustment setup for TCP305 and TCP312 Procedure 1. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for the degauss/autobalance routine to complete before proceeding. The routine is complete when the indicator light turns green. 2. Connect the current probe to the DC current loop. 3.
TCP305 and TCP312 Adjustments 6- 10 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCP303 and TCP404XL Adjustments Each of the following adjustment procedures describes how to adjust specific performance characteristics of the TCP303 and TCP404XL. Tolerances that are specified in these procedures apply to the current probe and do not include test equipment error. Required Test Equipment To perform the adjustment procedures in this section, you will need the test equipment listed in Table 6--8. The test equipment must meet or exceed the specifications listed.
TCP303 and TCP404XL Adjustments Adjustment Locations Refer to Figure 6--5 for the location of the probe adjustments.
TCP303 and TCP404XL Adjustments TCP303 and TCP404XL Transient Response and Coarse Gain Adjustment These procedures describe how to adjust and optimize the transient response and coarse gain adjustment of the TCP303 and TCP404XL probes, using the 1 s, 10 s, and DC gain adjustments. The current source and current loop setups are different between the two probes, but the connections are similar. Refer to Figure 6--6 when making equipment connections. Equipment Connections 1.
TCP303 and TCP404XL Adjustments AC current source + -- TCP303 probe Test oscilloscope TCPA300/400 amplifier 1 Turn High amplitude pulse generator Current probe 50 Ω oscilloscope input - use the TEKPROBE Interface Cable or use a 50 Ω cable. (Add 50 Ω termination here if oscilloscope has only high-impedance input).
TCP303 and TCP404XL Adjustments Table 6- 9: Settings for transient response and preliminary gain adjustments (Cont.
TCP303 and TCP404XL Adjustments TCP303 Procedure 1. Remove the access plugs that cover the DC gain, 10 s, and 1 s adjustments on the probe. 2. Preset the probe adjustments: Refer to Figure 6--5 on page 6--12 for adjustment locations. Do this only at the beginning of the probe adjustment process. a. Set the 1 s adjustment fully clockwise. b. Set the 10 s adjustment fully counter-clockwise. 3. Do not clamp the current probe around any conductor, but make sure the jaws are locked shut. 4.
TCP303 and TCP404XL Adjustments TCP404XL Procedure 1. Move the oscilloscope trace to one graticule line from the bottom of the screen. 2. Do not clamp the current probe around any conductor, but make sure the jaws are locked shut. 3. Remove the probe access plugs for 1 s, 10 s, and DC Gain. 4. Preset the probe adjustments: Refer to Figure 6--5 on page 6--12 for adjustment locations. Do this only at the beginning of the probe adjustment process. a. Set the 1 s adjustment fully clockwise b.
TCP303 and TCP404XL Adjustments DC Gain Adjustment This procedure adjusts the DC gain accuracy of the TCP303 and TCP404XL probes. Equipment Connections 1. Connect the amplifier OUTPUT to the DMM input using a BNC-to-Dual Banana connector, 50 Ω BNC cable, and a 50 Ω precision feedthrough termination. Do not connect the termination at the amplifier output. 2. Connect the current probe to the amplifier PROBE INPUT connector. 3.
TCP303 and TCP404XL Adjustments Equipment Settings Make or check the equipment settings in Table 6--10: Table 6- 10: Equipment settings for DC gain accuracy Digital multimeter Measurement Type AC volts, autorange Current source Output waveshape/frequency Output Squarewave, 40 Hz Off TCPA300 and TCPA400 Coupling Range: DC 5 A/V TCP303 Procedure 1. Do not clamp the current probe around any conductor, but make sure the jaws are locked shut. 2. Press the amplifier PROBE DEGAUSS AUTOBALANCE button.
TCP303 and TCP404XL Adjustments 6. If the DC gain adjustment was adjusted, verify the pulse response by repeating the TCP303 and TCP404XL Transient Response and Coarse Adjustment procedure beginning on page 6--13. 7. When the probe adjustments are done, reinstall the probe access plugs for the 1 s, 10 s, and DC Gain adjustments.
Maintenance
Customer Maintenance This manual supports maintenance of the amplifiers and probes. Service Strategy The amplifiers have some mechanical and electrical parts that may be replaced by the customer. This section describes the preventive maintenance and repair procedures. The probes can be repaired to component level. Information on troubleshooting and repair begin on page 7--13.
Customer Maintenance 7- 2 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Disassembly To access the internal adjustments or to replace internal components of the amplifiers, you need to remove the instrument case and internal covers. This section covers the disassembly of the amplifiers. Current probe procedures are described later in this section. Amplifiers Use these procedures when making adjustments or replacing components in the amplifiers. WARNING. Amplifier disassembly must be performed by qualified service personnel at an antistatic workstation.
Disassembly Removing the Outer Case and Internal Covers To replace internal components, you need to remove the outer case and internal covers. You may also want to remove the case and covers to access the internal adjustments. The following procedures describe the removal process: 1. Disconnect the AC cord and any probes or cables from the amplifier. 2. Remove the 3 screws from the rear of the amplifier and slide the case off the rear side of the amplifier. See Figure 7--1.
Disassembly 3. Remove the 6 screws that secure the right-side inner panel to the chassis. See Figure 7--2.
Disassembly 4. Remove the 4 screws that secure the left-side inner panel to the chassis. See Figure 7--3. Amplifier Left-- side panel Screws (4) Torque screws to 8 in-lbs when reassembling Figure 7- 3: Removing the left-side inner panel You now have exposed access to the amplifier adjustments. If you need to replace any of the internal components, refer to the following instructions.
Disassembly Replacing the Front Panel Assembly If you need to replace the Front Panel Assembly, do the following: 1. Wear an antistatic wriststrap when handling the circuit assemblies. 2. Using pliers, remove the heat sink clip from U9. See Figure 7--4. U9 heat sink clip Lift up the tab to remove the ribbon cable Probe input connector frame Screw Torque screws to 4 in-lbs when reassembling Figure 7- 4: Disconnecting the front-panel assembly 3.
Disassembly Replacing the Amplifier Board If you need to replace the amplifier board, you must detach the rear- and frontpanel assemblies of the amplifier from the chassis. 1. Wear an antistatic wriststrap when handling the circuit assemblies. 2. Remove the 2 Phillips screws that attach the AC power connector to the rear panel. 3. Gently pull back the rear panel enough to allow clearance for the amplifier board. 4. Disconnect the DC power supply connector from J3 on the amplifier board. 5.
Disassembly 8. Remove the screw that attaches the probe input connector to the front panel amplifier board to the chassis. Pull the front panel assembly away from the amplifier and set it aside. See Figure 7--6. 9. Remove the three screws that attach the amplifier board to the chassis. 10. Do in reverse steps 8 through 2 to install a new amplifier board.
Disassembly Replacing the Power Supply To replace the power supply, refer to Figure 7--7 and do the following: 1. Disconnect the AC and DC power connectors from the power supply. 2. Remove the four screws from the power supply. 3. Remove the power supply from the chassis. 4. Do in reverse steps 3 through 1 to install a new power supply.
Disassembly Replacing the Fan If you need to replace the fan, you must first detach the rear panel of the amplifier from the chassis to gain access to the fan: 1. Remove the 2 Phillips screws that attach the AC power connector to the rear panel. See Figure 7--8.
Disassembly 2. Disconnect the DC power supply connector from J2 on the amplifier board. See Figure 7--9. 3. Disconnect the fan connector from J3 on the amplifier board. 4. Gently pull back the rear panel enough to allow access to the four nuts that secure the fan to the rear panel. Nuts (4) Move the rear panel back Screws (2) from power connector. Torque screws to 4 in-lbs when reassembling J3 connector J2 connector Figure 7- 9: Removing the fan 5.
Disassembly Probes Use these procedures when repairing or replacing defective components in the current probes. WARNING. Probe disassembly must be performed by qualified service personnel. The probes that mate with the TCPA300 and TCPA400 Current Probe Amplifiers have two physical styles. The TCP305 and TCP312 use a slender form factor that contain three replaceable assemblies -- the connector/cable, the circuit board, and the current transformer.
Disassembly TCP305 and TCP312 Disassemble the TCP305 or TCP312 probe body as follows: 1. Remove the two screws from the bottom of the probe and pull the strain relief boot back as shown in Figure 7--10. Note: When reassembling the probe, insert and tighten the two screws. Verify that the slider works smoothly. If it does not, loosen the screws slightly. Probe body Strain relief boot Screws Figure 7- 10: Removing the strain relief boot 2. Move the probe slide assembly to the open position. NOTE.
Disassembly Be careful to keep this tiny metal ball from falling out (b) (a) (2) Grasp the top half of the probe body here with your other hand, then (1) Hold the bottom half of the probe body in one hand (a) pivot the back end up, and (b) slide the top forward off the end of the bottom half of the probe body Figure 7- 11: Removing the top half of the probe (1) Hold the bottom half of the probe body in one hand (a) (b) (2) Grasp the top half of the probe body here with your other hand, then (a) push
Disassembly Replacing the Current Transformer Replace the current transformer of the probe as follows: 1. Gently lift the front edge of the circuit board and transformer enough to clear the probe body. Refer to Figure 7--13. 2. Pull the transformer socket straight off the circuit board pins. Circuit board Current transformer Body half Figure 7- 13: Removing the current transformer 3. Before reassembling the probe, be sure that the gap between the stationary and moveable core pieces is clean.
Disassembly Replacing the Circuit Board or Cable Assembly Replace the circuit board or cable assembly of the probe as follows: 1. Remove the current transformer using the procedure on page 7--16. 2. Lift the plastic cable housing from the probe body half. See Figure 7--14. 3. Unsolder the probe body connection on the circuit board. Be careful not to damage the circuit board. 4. Lift the cable and the circuit board from the probe body half.
Disassembly TCP303 and TCP404XL The following procedures explain how to disassemble the probe body and replace the current transformer, the circuit board, and the cable assembly. WARNING. Probe disassembly must be performed by qualified service personnel. 1. Unlock the probe slide. 2. Place the probe on a flat surface with the screw heads facing up. 3. Using a 3/32 inch Allen wrench, remove the eight retaining screws from the case. 4.
Disassembly Removing the Current Transformer Remove the current transformer of the probe as follows: 8. To remove the current transformer, lift the assembly out of the probe as shown in Figure 7--16 and unplug it from the circuit board.
Disassembly 10. To remove the cable, do step 9 and then unsolder the two switch wires. Cut cable tie. (Before tightening new cable tie, check for enough cable lead length when seated in case) Disconnect cable Unsolder switch wires TCP404XL Unsolder switch wires TCP303 Figure 7- 17: Removing the circuit board and cable Removing the Circuit Board and Cable Assembly (TCP404XL) Reassembling the Probe The circuit board and cable are replaced as an assembly on TCP404XL probes. 11.
Isolating Hardware Faults Use the following procedures to help locate a hardware malfunction. You can isolate the symptoms to the amplifier or probe by substituting a known good probe or amplifier. If you suspect that you have a defective probe and you don’t have another compatible probe, you can use the calibration adapter in place of the probe to verify some of the amplifier functions. Tables 7--3 and 7--4 list some of the failures that can occur with the amplifiers and probes.
Isolating Hardware Faults Table 7- 4: Probe hardware faults Symptom Possible Cause Repair Action Probe Open LED stays continuously lit, even with the probe slider closed. Open coil in probe.
Replaceable Parts
Replaceable Parts This section contains a list of the components that are replaceable for the TCPA300 and TCPA400. As described below, use these lists to identify and order replacement parts. Parts Ordering Information Replacement parts are available from or through your local Tektronix, Inc., service center or representative. Changes to Tektronix instruments are sometimes made to accommodate improved components as they become available and to give you the benefit of the latest circuit improvements.
Replaceable Parts Indentation System This parts list is indented to show the relationship between items.
Amplifier Replaceable Parts 8 7 6 5 1 4 8 3 2 16 9 17 10 8 8 14 15 13 12 11 Figure 8- 1: TCPA300 and TCPA400 replaceable parts TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual 8- 3
Amplifier Replaceable Parts Replaceable parts list Fig. & index number 8-- 1-- 1 8- 4 Tektronix part number Serial no. effective Serial no. discont’d Qty Name & description Mfr. code Mfr. part number 174-- 4676-- 00 1 CABLE ASSEMBLY,DC, POWER SUPPLY 80009 174-- 4676-- 00 -2 210-- 0457-- 00 4 NUT,PL,ASSEM WA:6-- 32 X 0.312,STL CD PL,W/LOCKWASHER 0KB01 ORDER BY DESCRIPTION -3 119-- 6721-- 00 1 FAN,TUBEAXIAL:12VDC,0.10A,1.2W,14CFM,5600RP M,32DBA,50MM X 50MM X 15MM, W/3.
Amplifier Replaceable Parts Table 8- 1: Power cord identification Plug configuration Normal usage North America 120 V Option number/ part number Standard 161-0066-00 Universal Euro A1 161-0066-09 United Kingdom A2 161-0066-10 Australia A3 161-0066-11 Switzerland A5 161-0154-00 Japan A6 161-A005-00 China AC 161-0306-00 No power cord supplied.
Amplifier Replaceable Parts 2 3 1 Figure 8- 2: TCPA300 and TCPA400 standard accessories TCPA300 and TCPA400 standard accessories Fig. & index number Tektronix part number 8-- 2-- 1 -2 -3 8- 6 Serial no. effective Serial no. discont’d Qty Name & description Mfr. code Mfr. part number 011-- 0049-- 02 1 TERMINATOR,BNC:COAXIAL,50 OHMS,2W,BNC 61162 50L-- 012 BNC 012-- 0117-- 00 1 CABLE ASSY:COAX,RFD,50 OHM,30.
Amplifier Replaceable Parts 2 1 3 Figure 8- 3: TCPA300 and TCPA400 optional accessories TCPA300 and TCPA400 optional accessories Fig. & index number Tektronix part number Qty Name & description Mfr. code Mfr.
Amplifier Replaceable Parts 8- 8 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Current Probes Replaceable Parts 3 1 2 4 13 5 12 6 11 10 7 15 8 14 9 Figure 8- 4: TCP305 and TCP312 replaceable parts TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual 8- 9
Current Probes Replaceable Parts TCP305 and TCP312 Replaceable parts list Fig. & Index Number Tektronix Part Number 8-- 4-- 1 Serial No. Effective Serial No. Discont’d Qty Name & Description Mfr. Code Mfr. Part Number 204-- 0288-- 03 1 BODY HALF,PROBE:UPPER BODY HALF,BLACK,POLY 80009 204-- 0288-- 03 -2 214-- 0835-- 00 1 SPRING,HLCPS:0.127 OD X 2.
Current Probes Replaceable Parts 4 3 2 1 5 6 13 14 12 11 15 7 8 9 10 16 Figure 8- 5: TCP303 replaceable parts TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual 8- 11
Current Probes Replaceable Parts TCP303 Replaceable Parts List Fig. & Index Number Tektronix Part Number 8-- 5-- 1 Serial No. Effective Serial No. Discont’d Qty Name & Description Mfr. Code Mfr.
Current Probes Replaceable Parts 4 3 2 1 5 6 13 11 12 A1 10 7 8 9 14 Figure 8- 6: TCP404XL replaceable parts TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual 8- 13
Current Probes Replaceable Parts TCP404XL Replaceable Parts List Fig. & Index Number Tektronix Part Number 8-- 6-- 1 Serial No. Effective Serial No. Discont’d Qty Name & Description Mfr. Code Mfr.
Current Probes Replaceable Parts Manufacturers Cross Index Mfr.
Current Probes Replaceable Parts 8- 16 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Glossary and Index
Glossary amp-second product The unit of measure defining the maximum amount of pulsed current that can be measured before the probe core becomes saturated. The amp-second rating applies only to measurement values between the maximum continuous and maximum pulse current ratings of the probe. The amp-second rating is equal to the peak current multiplied by the pulse width at the 50% point.
Glossary Hall device A thin, rectangular piece of semiconductor material located in the core of the current probe. The Hall device uses the Hall effect for DC and low-frequency AC measurements. Hall effect The effect that produces a voltage potential in the Hall device when magnetic lines of force pass through the device. The voltage potential is directly proportional to the the magnetic field strength. The voltage polarity is determined by the magnetic field polarity.
Index A AC coupling, 1-- 14, 2-- 4, 3-- 3 Adjustments overview, 6-- 1 TCP303 & TCP404XL, 6-- 11 TCP305 & TCP312, 6-- 7 TCPA300 & TCPA400, 6-- 3 Amp-- second product, 3-- 4 Applications, 3-- 11 Autobalance function, 2-- 2 B Bucking current, 3-- 8 Button COUPLING, 2-- 4 MANUAL BALANCE, 2-- 3 ON/STANDBY, 2-- 4 PROBE DEGAUSS/AUTOBALANCE, 2-- 2 RANGE, 2-- 4 Degauss function, 1-- 11, 2-- 2, 3-- 1 functional check, 5-- 13 Differential current, 3-- 2 E Error Codes correcting, 3-- 25 displaying, 3-- 23 shutdown e
Index Maximum measurement times, 3-- 6 Maximum pulsed current rating, 3-- 4 Measuring continuity, 3-- 15 Measuring current AC, 1-- 14 current nulls, 3-- 2 DC, 1-- 12 differential current, 3-- 2 Measuring inductance, 3-- 13 N NONCOMPATIBLE PROBE TYPE, indicator, 2-- 4 NOT TERMINATED INTO 50 OHMS indicator, 2-- 4 Null current, 3-- 2 O ON/STANDBY button, 2-- 4 Optional Accessories, 1-- 5, 8-- 7 Options, 1-- 3 OUTPUT connector, 2-- 5 OVERLOAD indicator, 2-- 3 extending the current range, 3-- 8 increasing th
Index disassembly, 7-- 3 front panel display check, 5-- 5 TEKPROBE-- to-- TEKPROBE interface cable, 1-- 8 Termination, 50-- ohm feedthrough, 1-- 8 Test Record, Performance Verification TCP303, 5-- 42 TCP305, 5-- 29 TCP312, 5-- 30 TCP404XL, 5-- 43 TCPA300, 5-- 16 TCPA400, 5-- 17 Travel Case, 1-- 7 Troubleshooting, 3-- 19 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual Index- 3
