User's Guide Digital 20MHz and 60MHz Oscilloscopes Model MS460 - 60MHz Model MS420 - 20MHz 1
INTRODUCTION Congratulations on your purchase of the Extech Digital Oscilloscope. This manual is divided into two sections: Section One for the Oscilloscope functions and Section Two for the MultiMeter functions. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. 2 V5.
TABLE OF CONTENTS GENERAL INFORMATION WARRANTY 5 PRODUCT CONTENTS 6 SAFETY INFORMATION 7 INPUT CONNECTIONS 10 FRONT PANEL AND CONTROL KEYS OVERVIEW 11 RECALL FACTORY DEFAULT SETTINGS 19 PC DATA TRANSMISSION 63 FAQ. 76 APPENDIX A: SPECIFICATIONS 77 APPENDIX B: MAINTENANCE AND CLEANING 82 APPENDIX C: BATTERY CHARGING AND REPLACEMENT 83 APPENDIX D: SETTING THE REAL TIME CLOCK 84 SECTION ONE - OSCILLOSCOPE BASIC INSTRUCTIONS ON USING THE OSCILLOSCOPE POWERING THE OSCILLOSCOPE.
DISPLAY SETTINGS STORING WAVEFORMS IN THE METER FUNCTION SETTINGS MENU AUTO CALIBRATION. AUTO RANGE MEASUREMENTS AUTOSCALE MODE . CURSOR MEASUREMENTS FREQUENCY COUNTER (MS460) SQUARE WAVE OUTPUT. FFT MODE.(MS420) SYSTEM STATUS MENU. TIME BASE MODE . 40 42 43 44 44 45 49 52 53 54 61 62 SECTION TWO – MULTIMETER FUNCTIONS 64 CONNECTING THE METER. DISPLAY WINDOW. RESISTANCE MEASUREMENTS MEASURING DIODE VOLTAGE CONTINUITY TEST.
PRODUCT CONTENTS (REFER TO THE FIG. 1 BELOW) 1. MS420 / MS460 Instrument 2. AC Adaptor 3. Oscilloscope Probes (2); Grey in color 4. Multimeter test leads (2); One black, one red 5. USB mass storage connection cable 6. Extension module for low capacitance measurements 7. Probe adjustment tools 8. USB or Serial PC Communication cable 9. User manual 10. CD-ROM Software Program 11. Carrying Case Figure 1: Supplied Equipment 5 V5.
SAFETY INFORMATION Please read the user manual before use to ensure safety and precision SAFETY SYMBOLS AND TERMS SAFETY SYMBOLS THESE SYMBOLS MAY APPEAR IN THIS MANUAL OR ON THE INSTRUMENT: WARNING: “WARNING” IDENTIFIES CONDITIONS & ACTIONS THAT POSE A HAZARD TO THE USER Caution: “Caution” identifies conditions and actions that may damage the product or external equipment DANGER: High Refer to the Manual Protective Conductor Terminal Chassis Ground Earth (ground) Terminal SAFETY TERMS The followin
GENERAL SAFETY INFORMATION Carefully read the following safety information in order to avoid personal injury and damage to this product or to products connected to it. This product must only be used in the specified manner to prevent danger and hazard to products and persons. Warning: To avoid fire or electrical shock please use the proper power adapter. Use only the power adapter recommended by the manufacturer.
applications and as V dc for DC applications. Overvoltage Category II refers to local level applicable for appliances and portable equipment. Only qualified technical personnel should perform maintenance on these devices. Observe the nominal value limits for all terminals: To avoid fire or electric shock, observe all nominal value limits, markings, and specifications for this product. Before connecting to this product, carefully read the user’s manual.
INPUT CONNECTIONS INPUT CONNECTIONS See Figure 2 below 6 Figure 2 Description 1. The power adapter is use to supply AC power and for battery recharging 2. Multimeter test leads 3. Multimeter input jacks (L to R: Current 2A-10A input, mA Current input, COM ground input, Voltage/Resistance/Capacitance input) 4. Oscilloscope probes 5. Oscilloscope channel inputs 6. Square wave output jack 9 V5.
FRONT PANEL AND KEYPAD OVERVIEW Figure 3 10 V5.
Description of Meter Front Panel and Keypad (Figure 3) 1. AC adapter Port 2. RS-232C Port 3. USB Port 4. USB Mass Storage Port 5. Power switch 6. F1 – F5 Soft-key options 7. AUTO SET: In the Scope mode, the meter automatically selects the horizontal/vertical scale and trigger level 8. COPY: Press to store the waveform data into a USB storage device 9. ▲ (Red): Adjust the horizontal scale for Channel 1 10. VOLTS POSITION (Red): Switch between voltage and horizontal scales for Channel 1 11.
BASIC OSCILLOSCOPE FUNCTIONS ABOUT THIS CHAPTER This chapter provides introductory Oscilloscope instructions. This introduction does not cover all of the oscilloscope capabilities but provides basic examples of menu navigation and operations. Detailed instructions are provided in the Advanced Oscilloscope functions section. POWERING THE OSCILLOSCOPE Connect the oscilloscope to an AC power source using the supplied AC adaptor.
Description of Oscilloscope Display Screen (Figure 4) 1. Battery power status icon ( , , and ) 2. Auto measurement screen No. 1 (“f” for frequency, “T” for cycle, “V” for average value, “Vp” is the peak-peak value and “Vk” is the root-meansquare value 3. Auto measurement screen No. 2 4. Horizontal triggering position 5. The difference in time between the horizontal triggering position and the screen’s centerline (zero when the pointer is in the center of the screen) 6.
13. The coupling mode for CH2; “~” AC, “-” DC, and ground 14. The vertical Voltage units scale for CH2 15. The coupling mode for CH1; “~” AC, “-” DC, and ground 16. Vertical Unit Scale for CH1 17. The blue pointer shows the ground point of the waveform for CH2 (zero position). If this pointer is not shown, the channel has not been opened. 18. OPTION (options vary with each function) 19. The red pointer shows the ground point of the waveform for CH1 (zero position).
MENU DESCRIPTION The following explains how to navigate the menus to select a function. 1. Press the MENU key to open the Function Menu. The Menu appears on the right of the screen with the corresponding options available on the bottom of the screen. Press MENU again to hide the Function Menu. 2. Use the MENU ▲ or MENU ▼ keys to navigate and select menu functions. 3.
Figure 6 2. Press ◄ (yellow) or ► (yellow) to adjust the main time base. Press ▲ (yellow) or▼ (yellow) to adjust the trigger horizontal position. 3. Press OPTION again and the following will appear: ◄/► – Time ▲/▼– Trig See Figure 7: Figure 7 4. Press ◄ (yellow) or ► (yellow) to adjust time base horizontal position, press▲ (yellow) or ▼ (yellow) to adjust trigger position. 5. Use the OPTION key to toggle between the two modes described above. 16 V5.
When triggering in the Alternate trigger mode: 7. Press OPTION and the following will appear: —Time —Trig 2 See Figure 8: Figure 8: 7. Press ◄ (yellow) or ► (yellow) to adjust the time base horizontal position and press ▲ (yellow) or ▼ (yellow) to adjust the trigger horizontal position for Channel 2. 8. Press OPTION again to display the following: — Time Base — Trig 1 See Figure 9: 17 V5.
Figure 9: 9. Press ◄ (yellow) or ► (yellow) to adjust the main time base and press ▲ (yellow) or▼ (yellow) to adjust the trigger horizontal position for Channel 1. 10. Press OPTION again to return to step 6 above.
RECALL THE FACTORY DEFAULT SETTINGS To reset the Oscilloscope to the factory default settings, refer to the following: 1. Press the MENU key; the function menu will appear on the right side of the screen 2. Press the MENU ▲ or MENU ▼ key to select a FUNCTION; three options will be visible at the bottom of the screen. 3. Press F1 (Recall Factory) to recall the factory settings. 4. Press F2 to select “Auto calibration”.
MEASURE UNKNOWN SIGNALS USING THE AUTO‐SET FEATURE The Auto-Set feature allows the Oscilloscope to measure and display unknown signals automatically. This function optimizes position, range, time-base, and triggering. It also assures a stable display of virtually any waveform. Auto Range is especially useful for quickly checking several signals. To enable the Auto-Set feature, perform the following steps: 1. Connect the test probe to the circuit or device under test. 2.
Refer to Figure 11: Figure 11: Automatic Scope Measurements DATA HOLD (FREEZING THE DISPLAYED READING) To freeze any displayed reading or waveform, follow these steps: 1. Press the RUN/STOP key to freeze the screen: STOP appears at the top (right) of the screen. 2. Press the RUN/STOP key again to resume normal mode. Refer to Fig. 12: Figure 12: Freezing the Screen 21 V5.
USING THE AVERAGE MODE TO SMOOTH WAVEFORMS Use the Average mode to smooth the displayed waveform; multiple data samples will be averaged. The number of samples to average is selectable from 4, 16, 64, up to 128. Note: For best results, the waveform must be repetitive. As the number of average samples increases the waveform updating time increases. Refer to the following: 1. Press the MENU key; the function menu will appear on the right side of the screen. 2.
1. Press the MENU key; the function menu will appear on the right side of the screen. 2. Press MENU ▲ or MENU ▼ to select DISP SET. Four (4) selectable options will appear at the bottom of the screen. 23 V5.
3. Press the F2 key to select 1 sec, 2 sec, 5 sec, infinite or OFF. Select a 1, 2, or 5 second waveform display duration as desired. When Infinite is selected the waveform will remain on the screen indefinitely. When OFF is selected, the Persistence function has no effect on displayed waveforms. Refer to Figure 14.
Figure 15: Peak Detection Glossary of Terms • Collecting mode: The oscilloscope converts the collected analog data into digital data for each of the following three modes: Sampling, Peak Detect, and Averaging. • Sampling: The waveform sampling resolution in seconds. Waveforms that change faster than the sample duration will not be accurately captured.
After a reset, the Oscilloscope is dc-coupled so that ac and dc voltages appear on the screen. Use ac-coupling to observe a small ac signal that rides on a dc signal. To select ac-coupling, perform the following steps: 1. Press the MENU key; the function menu will appear at the right side of the screen. 2. Press MENU ▲ or MENU ▼ to select the CH1 Setting. Four (4) selectable options appear at the bottom of the screen. 3. Press the F1 key and select AC. The AC coupling icon will appear on the screen.
Figure 17: Inverted Waveform USING MATHEMATICAL FUNCTIONS ON WAVEFORMS When adding (CH1 + CH2), subtracting (CH1 – CH2, CH2 – CH1), multiplying (CH1 * CH2) or dividing (CH1/CH2) the input waveforms of CH1 and CH2, the oscilloscope will display the mathematical result waveform M and the input waveforms of CH1 and CH2 on the screen. The Mathematical functions perform a point-to-point calculation on the waveforms (CH1 and CH2). To use a Math function, perform the following steps: 1.
5. Press▲(yellow) or ▼(yellow) to adjust the vertical display position of waveform M. Press ◄(yellow) or ►(yellow) to adjust the display time factor for waveform M. Refer to Figure 18. Figure 18: Waveform Mathematical Calculations USB MASS STORAGE DEVICE / SAVE WAVEFORM DATA Connect a USB mass storage device to the USB port on the meter using the supplied cable. Press the COPY key. The current waveform data will then be saved (the file names are automatically sequenced (WAVE1.bin, WAVE2.bin, etc.).
ADVANCED OSCILLOSCOPE FUNCTIONS ABOUT THIS CHAPTER Advanced Oscilloscope functions are covered in this chapter. VERTICAL SETTINGS FOR CH1 AND CH2 Each channel has its own independent vertical menu and each item can be set respectively based on the specific channel. To make vertical CH1 and CH2 settings, perform the following steps: 1. Press the MENU key; the function menu will appear at the right of the screen. 2. Press MENU ▲ or MENU ▼ to select CH1 SETUP.
The following Table describes the Vertical Channel menu: Function Description Setting menu Coupling AC The dc component in the input signal is blocked DC The ac and dc components of the input signal are available OFF Close the channel ON Open the channel Channel 1X 10X Probe Select the desired probe attenuation 100X 1000X Inverted OFF Waveform is displayed normally ON Open the Invert function for the waveform setting SETTING THE CHANNEL COUPLING CH1 will be used in this example.
Figure 20: AC Coupling 31 V5.
Figure 21: DC Coupling OPEN AND CLOSE MEASUREMENT CHANNELS CH1 will be used in this example. Press the F2 Channel key and then OFF to Close CH1. Press the F2 Channel key and then ON to Open CH1. SETTING THE PROBE ATTENUATION To prevent excessive input voltage, set the probe attenuation level to the 10X position. Next, magnify the display by 10X to match the displayed amplitude to the actual amplitude. Press F3 Probe to adjust the probe attenuation level.
INVERT A WAVEFORM Inverted waveform: The displayed signal reverses 180 degrees relative to ground. Press F4 Invert to invert the waveform; press F4 Invert again to exit the inversion mode. 33 V5.
WAVE MATH FUNCTION MENU SETTINGS The WAVE MATH functions show the calculation results (adding, subtracting, multiplying or dividing CH1 and CH2 channel waveforms). Arithmetic operation results can be displayed using a grid or a cursor. The amplitude of the calculated waveform can be adjusted with CHM VOL, which is displayed in the scale factor form. The amplitude ranges from 0.001 through 10 (in 1, 2, and 5 step increments) that is, it can be expressed as 0.001X, 0.002X, 0.005X…10X.
Figure 22: Waveform Mathematics SETTING THE TRIGGER SYSTEM The trigger determines when the acquisition and display of waveform data occurs. When starting to acquire data, the oscilloscope collects sufficient information to draw the waveform at the left side of the triggering point. While waiting for a triggering condition, the oscilloscope gathers data continuously. After a trigger is detected, the oscilloscope gathers data continuously to draw the waveform at the right side of the triggering point.
TRIGGERING CONTROL There are three triggering modes: Edge triggering, Video triggering, and Alternating triggering. Each trigger mode has its own function menu. Edge triggering: The edge trigger triggers on the incoming signal edge. Use the edge trigger for all signals except for video. Video triggering: Perform video field trigger or line trigger on standard video signals. Alternate trigger: Use this mode when the CH1 and CH2 signal frequency differs.
The Edge triggering menu is described in the following table Description Function Settings menu Slope Source Trig mode Rising Triggering on the rising edge of the signal Falling Triggering on the falling edge of the signal.
Figure 24a (screen 1) and 24b (screen 2): Odd Field Video Trigger Fig. 25: Video Line trigger (screen 1) Fig. 26: Video Line Trigger (screen 2) The Video triggering menu is described in the following table.
Odd field Set synchronous trigger in video odd line Even field Set synchronous trigger in video even line Line NUM Set synchronous trigger in video Line NUM Move to next menu When the sync is Line, Field, Odd Field, Even Field, the second page is as follows: NTSC National Television System Committee standard (most common) PAL/SECAM Less common video standard (used in Europe) MODU (Modulation) Hold-off Move to the Hold-off menu Return to previous menu When the sync is Designed Line, the second p
ALTERNATE TRIGGER In Alternate trigger mode, the trigger signal is taken from two vertical channels. Alternate trigger mode can be used to observe two signals of differing frequencies. From this menu the user can set a different trigger type for two separate vertical channels. Refer to Figure 27a. Figure 27a: Alternate Trigger The Alternate triggering menu is described in the following tables.
Coupling AC The DC component is blocked DC All components are allowed to pass HF Rjc The HF part of the signal is blocked and only the LF component is allowed LF Rjc The LF part of the signal is blocked and only the HF component is allowed SENS Set trigger sensitivity Hold-off Move to the Hold-off menu Return to previous menu Function menu Settings Description When VIDEO TRIGGERING is selected: CH SEL CH1 CH2 Set trigger type and other parameters for CH1 Set trigger type and other paramete
Line NUM Set synchronous trigger in video Line NUM When the sync is Line, Field, Odd Field, Even Field, the menu is as follows: MODU NTSC Common video standard (used in the U.S.) (Modulation) PAL/SECAM Least common standard (common in Europe) Hold-off Move to the Hold-off menu When the sync is Designed Line, the menu is as follows: MODU NTSC Common video standard (used in the U.S.
When the ‘Hold-off’ menu is accessed the screen will appear as below: Figure 27b: ‘Hold-off’ menu screen (MS420) Refer to the Table below for details on the ‘Hold-off’ mode: (MS420 only) Function menu Settings OFF Time Time Description Select a time duration (hold-off time) that will act as a delay before each trigger event Increase Increase the time Decrease Decrease the time Reset the Time Reset the hold-off time to 100ns Back Return to the previous menu Note: Trigger Hold-off can stabilize
Glossary of Terms • Hold-off time: Programmable time period between trigger events (100ns default). • Trigger modes: There are three trigger modes: Auto (acquires signal continuously), Normal (acquires signal when trigger conditions are met) and Single (manually triggers the signal). • Automatic trigger mode: In this mode, the oscilloscope can acquire a waveform without a triggering condition • Normal trigger mode: In this mode, the oscilloscope cannot acquire the waveform until it is triggered.
ACQUISITION MODE The Acquiring Mode menu is described in the Table shown below. Function menu Settings Description Sample Peak Detect The waveform data sampling time interval. The sample mode accurately reconstructs the waveform, but cannot respond to rapid changes and sudden peaks. 50ns max. Average Averages The peak detect mode captures rapid changes and sudden peaks. Multiple samples are averaged.
Carry XY vertical axis Bitmap Data transmitted in bitmap format (dots) Vectors Data transmitted in vector format (line) DISPLAY STYLE The display style includes Vector and Dot display types, as shown in Figure 28 and 29. 46 V5.
Figure 28: Dot Style Figure 29: Vector Style PERSISTENCE The user can select the duration of time that past traces remain on the display. The selections are 1, 2, 5 seconds, Infinite, and OFF. XY MODE This mode is only applicable to simultaneous CH1 and CH2 measurements. The X-Y format plots the CH1 input as X-axis and CH2 input as Y-axis. This display mode is 47 V5.
convenient for viewing the phase relationship between CH1 and CH2; if the oscilloscope does not detect triggering the data appear in light spots. 48 V5.
Description of Control Keys: ■ The CH1 VOL and CH1 ZERO keys for CH1 are used to set the horizontal scale and position. ■ The CH2 VOL and CH2 ZERO keys for CH2 are used to set the vertical scale and position continuously.
2. Use the MENU ▲ or MENU ▼ key to select Wave Save. Four (4) selectable options will then appear at the bottom of the screen. 3. Press the F1 key to select CH1 as the signal source. 4. Press the F2 key to select Address A. 5. Press the F3 key to save the waveform on CH1 in address A. To display the saved waveform on the screen, perform the following steps: 6. Press F4 to select Start for Address A. The waveform saved in Address A will be displayed in green.
Refer to Figure 30: Figure 30: Save and Recall Waveforms FUNCTION SETTING MENU (REFER TO TABLE BELOW) Press the MENU button and use the up/down arrow keys to scroll to FUNCTION Function menu Description Recall Factory Set the meter’s settings to their factory default conditions Auto Calibration Perform an Auto-calibration procedure Language Select the desired display language (English, Chinese, Deutsch, or Greek) Auto-calibration The Auto-calibration function automatically configures internal par
and probes from the oscilloscope 3. After removing all cables, press F2 (Auto calibration) again. The Auto-calibration automatically starts and a status message appears. To interrupt calibration, press any key during the calibration. 52 V5.
AUTOMATIC RANGING MEASUREMENTS The oscilloscope can perform twenty (20) automatic measurements: Frequency, cycle, average, peak-to-peak, root mean square, Vmax, Vmin, Vtop, Vbase, Vamp, overshoot, pre-shoot, rise time, fall time, +width, -width, +duty, -duty, delayA B and delayA B . Two measurement results can be displayed simultaneously on the screen. The function menu for automatic measurements is described in the following Table.
CH1 Measure the Overshoot of CH1 CH2 Measure the Overshoot of CH2 CH1 Measure the Preshoot of CH1 CH2 Measure the Preshoot of CH2 CH1 Measure the RiseTime of CH1 CH2 Measure the RiseTime of CH2 CH1 Measure the Fall Time of CH1 CH2 Measure the Fall Time of CH2 CH1 Measure the +Width of CH1 CH2 Measure the +Width of CH2 CH1 Measure the -Width of CH1 CH2 Measure the -Width of CH2 CH1 Measure the +Duty of CH1 CH2 Measure the +Duty of CH2 CH1 Measure the -Duty of CH1 CH2 Measure th
options will then appear at the bottom of the screen 3. Press the F1 key to select the frequency measurement of CH1. The measurement window will appear red in color and show the frequency of CH1 4. Press the MENU ▲ or MENU ▼ key to select MEAS SET 2. Five (5) selectable options will then appear at the bottom of the screen 5. Press the F4 key to select the peak-to-peak value of CH2.
changing horizontal setting Horizontal Adjust horizontal scale without changing vertical setting HORI—VERT Adjust the vertical and horizontal settings Display one or two periods Display multi-period waveforms To measure CH1 voltage: 1. Press MENU, the function menu will appear on the right side of the screen. 2. Press MENU ▲ or MENU ▼ and choose AUTOSCALE; three (3) options will appear at the bottom of the screen 3. Press F1 to select ON 4.
Fig 32: Autoscale Horizontal - Vertical multi-period waveforms Fig 33: Autoscale Horizontal - Vertical mono-period waveform 57 V5.
Fig 34: Vertical mode multi-period waveform Fig 35: Horizontal mode multi-period waveform 58 V5.
Notes: 1. In Autoscale mode the meter can automatically set the Trigger mode (Edge, Video, and Alternate) and Type (Edge, Video) 2. In Autoscale mode the meter switches to YT Mode (Auto) from XY mode (STOP) 3. In Autoscale, the meter defaults to DC coupling and AUTO triggering mode 4. If the user attempts to manually adjust the vertical position, voltage division, trigger level or time scale while in the Autoscale mode the meter will automatically exit the Autoscale mode 5.
CURSOR MEASUREMENTS Two cursors can be used to make instantaneous Time and Voltage measurements for CH1 and CH2 signals. Refer to the following table for more information.
Figure 36-a: Use the Cursor for a Voltage Measurement When the MENU button is pressed, the data table appears as shown in Figure 36-b: Figure 36-b: Data Table To use the cursor for a Time measurement on CH1, perform the following steps: 1. Press the MENU key; the function menus will appear at the right of the screen. 2. Press the MENU ▲ or MENU ▼ key to select Cursor measurement. Two (2) selectable options will then appear at the bottom of the screen. 3.
5. Press OPTION and the display will show: —Cursor 2 —Cursor 1 Press ▲ (yellow) or ▼ (yellow) to move T1 left and right; the value of T1 (relative to the middle of the screen) will display. Press ◄(yellow) or ►(yellow) to move T2 left and right; the value of T2(relative to the middle of the screen) will display as shown in Figure 37-a: Figure 37-a: Time Measurement using cursor When the MENU button is pressed, the data table appears as shown in Fig. 37-b. Figure 37-b: Data Table 62 V5.
SIX (6) DIGIT FREQUENCY COUNTER (CYMOMETER) MS460 ONLY The frequency counter measurement range is 2Hz~60MHz. When the meter is configured for edge triggering, it can only measure one channel (the channel that is triggering). When the triggering mode is set to Alternating trigger the instrument can measure both channels (CH1 and CH2). To configure the Frequency Counter for two channel operation: 1. Press MENU and the function menu will appear on the right side of the screen. 2.
SQUARE WAVE OUTPUT TEST SIGNAL (5V, 1 KHZ) The 5V Square Output is available on the jack at the left side of the meter. The 5V digital output has a frequency of 1 KHz and can be used to adjust the probe, as shown as Fig.39 Fig 39: Square-wave test signal Fig 40: 5V square wave output adaptor 64 V5.
USING FFT (FAST FOURIER TRANSFORM) (MS420 ONLY) FFT breaks down signals into component frequencies, which the oscilloscope uses to display a graph of the frequency domain of a signal (as opposed to the oscilloscope’s standard time domain graph). These frequencies can then be matched with known system frequencies, such as system clocks, oscillators, or power supplies.
*1 Set multiple *1 *2 Set multiple *2 *5 Set multiple *5 *10 Set multiple *10 Zoom The steps below instruct on the operation of the FFT feature: 1. Press the MENU key; the function menu will appear on the right side of the screen. 2. Press MENU ▲ or MENU ▼ to select FFT MODE. Five options will then be available at the bottom of the screen. 3. Press F1 to turn FFT ON/OFF (the green waveform F will be shown on the screen after the FFT calculation is completed). 4.
z One of the following two prompts will display at the bottom-left of the screen when the Format is set to Vrms. — CH1 voltage level — FFT vertical position Press the blue button VOLTS POSITION; the following will appear: — CH2 OFF 9. If the FFT source is CH2, press the blue button VOLTS POSITION , z One of the following three prompts will display at the bottom-left of the screen when the Format is set to dB.
of CH1 ("CH1 2v~ " appears at bottom side of the screen); z If the display at the bottom left side of the screen is " —FFT vertical position", use the red buttons VOLTS POSITION▲ and ▼ to adjust the position of the waveform along the vertical position. For example, "FFT 1.20 DIV (24.0dB)" indicates that the cursor departs from the center line for 1.20 DIV and "CH1 20dB" is shown on the bottom left side of the screen; the arithmetic product is 24.0dB.
Figure 41 Selecting an FFT Window ■ The FFT feature provides four (4) windows. Each is a trade-off between frequency resolution and magnitude accuracy. What is measured and what the source signal characteristics are help determine which window to use. Use the following guidelines to select the best window.
Hamming This is a good window for resolving frequencies that are very close to the same value with somewhat improved amplitude accuracy over the rectangle window. It has a slightly better frequency resolution than the Hanning selection. Use Hamming for measuring sine, periodic, and narrow band random noise. This window works on transients or surges where the signal levels before and after the event are significantly different.
Fig 42 - Rectangle window Fig 43 - Blackman window Fig.44 - Hanning window 71 V5.
Fig.45 - Hamming window Quick Tips If desired, use the zoom feature to magnify the FFT waveform. Use the default dBV RMS scale to see a detailed view of multiple frequencies, even if their amplitudes vary greatly. Use the linear RMS scale to see an overall view of how frequencies compare. Signals that have a DC component or an offset can cause incorrect FFT waveform component magnitude values. To minimize the DC component, choose AC Coupling on the source signal.
3) XY Formatting in the DISPLAY SET mode 4) “SET 50%” (trigger level at the vertical point of the signal amplitude) in the Trigger setting mode 5) Autoscale 6) Wave recording 7) Measure 1 and Measure 2 73 V5.
SYSTEM STATUS MENU The system status menu is used to display configuration information concerning horizontal, vertical, trigger, and other systems. Follow the steps below to check status: 1. Press the MENU key; the function menu will then appear at the right side of the screen. 2. Press the MENU ▲ or MENU ▼ key to select SYSTEM STAT. Four (4) selectable options will then appear at the bottom of the screen. 3. Sequentially press F1 through F4 to view the corresponding status information.
MAIN TIME BASE MODE The time base mode menu is explained as the following table. Function menu Setting Explanation Main Time Base Horizontal main time base Zone Window Use the two cursors to define a zoom window area Window Full-screen display To zoom in on a small area of the display, perform the following steps: 1. Press MENU to view the function menu on the right side of the screen. 2. Press MENU ▲ or MENU ▼ to select the TIME MODE.
Figure 48: Window Zoom PC DATA TRANSMISSION For PC data transmission, perform the following steps: 1. Press MENU; the function menu will then appear on the right side of the screen 2. Press MENU ▲ or MENU ▼ to select the display setting mode DISP SET; the display will show four (4) selectable options at the bottom of the screen 3. Press the F4 key; select Bitmap or Vectors 4. Connect the oscilloscope to the PC using the supplied data transmission cable 5. Install and open the supplied software 6.
User's Guide Model MS460 60 MHz Digital Oscilloscope Model MS420 20 MHz Digital Oscilloscope SECTION TWO: Multimeter Operation 77 V5.
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USING THE MULTIMETER ABOUT THIS CHAPTER This chapter provides step-by-step instructions for using the Multimeter functions. These instructions also provide basic examples of menus and other basic operations. MAKING METER CONNECTIONS Use the four 4-mm safety banana jack inputs for the Meter functions: COM, V/Ω/C, 10A, mA.
Description 1. Battery status indicator 2. Manual range indicator. In MANUAL mode the user selects the measurement range 3. Measurement mode indicators: DCV: DC Voltage measurement ACV: AC voltage measurement DCA: Direct current (DC) measurement ACA: AC current measurement R: Resistance measurement : Diode measurement : Continuity measurement C: Capacitance measurement 4. Relative measurement mode indicator 5. RUN: Continuous update mode. STOP: Display data hold mode 6.
MAKING MULTIMETER MEASUREMENTS Press the DMM/OSC key; the oscilloscope will switch to the multimeter mode. The meter will prompt the user to correctly insert the test leads. Use the A, V, and R keys to select the desired multimeter function. MEASURING RESISTANCE To measure resistance, first remove power from the component or circuit under test and then follow these steps: 1. Insert the black lead into the COM banana jack input and the red lead into the V/Ω/C banana jack input 2. Press the R key.
5. Reverse the test lead polarity and perform the test again Refer to the example display screen in Figure 3. 82 V5.
Figure 3: Diode Measurement CONTINUITY TEST To perform a resistance continuity test, refer to the following: 1. Insert the black lead into the COM banana jack input and the red lead into the V/Ω/C banana jack input 2. Press the R key. An ‘R’ appears at the top of the screen 3. Press the SET key repeatedly until the following is shown on the screen: 4. Connect the red and black leads to the test points.
Figure 4: Continuity Test 84 V5.
MEASURING CAPACITANCE To measure Capacitance, refer to the following: 1. Insert the black lead into the COM jack, and the red lead into the V/Ω/C jack 2. Press the R key. An ‘R’ appears at the top of the screen 3. Press the SET key until the C appears at the top of the screen 4.
Figure 6: DC Voltage Measurement MEASURING AC VOLTAGE To measure AC voltage, refer to the following: 1. Insert the black lead into the COM banana jack input and the red lead into the V/Ω/C banana jack input. 2. Press the V key and then press SET so that the ACV symbol appears at the top of the screen 3. Connect the red and black leads to the measured points and the AC voltage values of measured points will be displayed on the screen. Refer to the example diagram in Figure 7.
MEASURING DC CURRENT To measure a DC current lower than 400 mA, do the following: 1. Insert the black lead into the COM banana jack input and the red lead into the mA banana jack input 2. Use the A key and the SET key as needed to select the DCA mode (the DCA symbol will appear at the top of the screen 3. Ensure that the displayed unit of measure on the main reading screen is mA. Use the F4 soft-key to select mA if necessary. 4.
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Figure 9: 10A DC Current Measurement MEASURING AC CURRENT To measure AC current lower than 400 mA, perform the following: 1. Insert the black lead into the COM banana jack input and the red lead into the mA banana jack input 2. Press the A key and then the use the SET key to select the ACA mode. The ACA symbol will appear at the top of the screen when selected 3. Use the F4 soft-key to select the mA mode 4.
Figure 10: 400mA AC Current Measurement 90 V5.
To measure AC current larger than 400 mA, perform the following: 5. Press the A key and use the SET key to select the ACA mode (ACA symbol will appear at the top of the screen when selected) 6. Press the F5 soft-key to select the 10A measurement mode, the unit of measure on the main reading screen should be A 7. Connect the red and black test leads to the measured points on the circuit under test; The AC current value will be displayed on the screen. 8.
Figure 12: Freezing the Readings TAKING A RELATIVE MEASUREMENT The meter can display a reading ‘relative’ to a user-selectable reference value. Refer to the following discussion on how to make a relative measurement. First program a reference value. To do so, take a measurement and when the desired reading is displayed press the “||/ ” soft-key until the ‘ ’ symbol is displayed at the top of the screen; this indicates that the unit is in the Relative mode.
SELECTING THE AUTOMATIC / MANUAL RANGE MODES The default mode of the instrument is the automatic range. To switch to the manual range, perform the following steps: 1. Repeatedly press the F1 MANUAL soft-key until the desired range is selected on the meter’s display. MANUAL will be displayed on the upper left hand corner of the meter’s display when in the manual mode 2. In the manual range mode, the measuring range is increased by one stage with each press of the F1 key.
V5.
FAQ The oscilloscope does not power up Check that the battery is charged. If the battery is not charged, plug the AC Adaptor charger into an AC source and then into the meter. Charge the battery for at least 15 minutes before using the Oscilloscope. Please contact Extech for service if the instrument fails to power on after a charge The oscilloscope shuts down after operating for only several seconds The battery is most likely very weak or completely drained; Check the displayed battery status symbol.
When using average sampling in the sampling mode or when selecting a long display time in the oscilloscope display mode, the display speed is slow; this is normal 96 V5.
APPENDICES APPENDIX A: SPECIFICATIONS OSCILLOSCOPE Unless otherwise indicated, all technical specifications are applicable to the 10X probe attenuation switch setting. The oscilloscope should meet the following requirements in order to meet the published specifications.
( T) measurement accuracy（full bandwidth） Average 16 : ± (1 sampling interval time +100ppm×reading+0.4ns) 98 V4.
Vertical Analog digital converter A/D 8 bits resolution (both channels synchronously) Sensitivity range 5mV/div 5V/div(for the BNC connector input V/div Displacement range ± 10 div (MS420), ±2V(5mV/div ~ 200mV/div), ±50V(500mV/div ~5 V /div) (MS460) Analog bandwidth 60MHz (MS460); 20MHz (MS420) Single bandwidth Full bandwidth Low frequency response ≥ 5Hz (BNC connector (A/D coupling, -3dB) Rise time ≤17.5ns (MS420) , ≤5.
Trigger sensitivity (Video triggering and typical mode) 2 divisions of peak-to-peak value Signal system and line/field frequency (Video triggering mode) Supports NTSC, PAL and SECAM broadcasting systems of any field or line frequency Measurement Cursor measurements Voltage difference and time difference between cursors Auto measurements Peak-to-Peak voltage, mean voltage, root mean square value, frequency and period (MS420 0nly):Vmax, Vmin, Vtop, Vbase, Width, Overshoot, Pre‐shoot, Rise time, Fall
Probe 1X position 10X position Bandwidth Up to 6 MHz (DC) Up to full bandwidth (DC) Attenuation rate 1: 1 10: 1 Compensation range 20pf 40pf Input resistance 1MΩ ±2 10MΩ ±2 Input impedance 85pf 115pf 14.5pf 17.5pf Input voltage 150 V DC 300 V DC MULTIMETER Voltage (VDC) Input Impedance: 10MΩ Max. Input Voltage: 1000V (DC or AC peak-to-peak value) Range Accuracy Resolution 400.0mv ±1.5% ±2 digit 100uV 4.000V ±1% ±1 digit 1mV 40.00V 10mV 400.
Range Accuracy Resolution 40.00mA ±1.5% ±1 digit 10uA 400.0mA ±1.5% ±1 digit 100uA 10A ±3% ±3 digit 10mA 102 V4.
Alternating Current (AC) Range Accuracy Resolution 40.00mA ±1.5% ±3 digit 10uA 400.0mA ±2% ±1 digit 100uA 10A ±5% ±3digit 10mA Range Accuracy Resolution 400.0 Ω ±1% ±3 digit 0.1Ω 4.000KΩ ±1% ±1 digit 1Ω Resistance 40.00KΩ 10Ω 400.0KΩ 100Ω 4.000MΩ 1KΩ 40.00MΩ ±1.5% ±3 digit 10KΩ Range Accuracy Resolution 51.20nF ±3% ±3 digit 10pF Capacitance 512.0nF 100pF 5.120uF 1nF 51.20uF 10nF 100uF 100nF Diode Voltage reading: 0 V ～1.
GENERAL SPECIFICATIONS Dimensions 7.1 x 4.5 x 1.6” (18 × 11.5 × 4cm) Weight 1.4 lbs. (645 g) Power consumption 6W Display type 3.7" color liquid crystal display (LCD) Display resolution 640 (horizontal) × 480 (vertical) pixels Display color 65536 colors Power Adapter Power supply 100-240 V AC 50/60Hz Power output 8.
APPENDIX B: MAINTENANCE AND CLEANING MAINTENANCE Do not store or place this instrument where the liquid crystal display (LCD) may be directly exposed to sunlight for extended periods Warning: Do not allow the instrument to become wet Cleaning Inspect the instrument and the probe frequently in accordance with operating conditions. Clean the outer surface of the instrument according to the following steps: 1. Wipe the outside of the instrument and the probe using a soft cloth.
APPENDIX C: CHARGING THE INSTRUMENT The lithium battery may ship un-charged. The battery must be initially charged for 4 hours (the instrument must be turned off during charging). The battery can supply power for 4 hours after being charged completely. When supplying power by using the battery, a battery indicator is displayed on the top of the screen. The battery symbols appear as follows: , , and , where indicates that the battery can only be used for about 5 minutes.
APPENDIX D: SET THE REAL‐TIME CLOCK 1. Press the MENU key; the function menu will display on the right side of the screen. 2. Use the MENU ▲ or MENU ▼ key to select SYS STAT; four (4) options will appear at the bottom of the screen. 3. Use the F4 key to select the MISC option and the system time, along with other information, will appear as shown below: 4. Press OPTION to enter the Time setting mode. The highlighted field can be edited. 5.
Warranty (English) EXTECH INSTRUMENTS CORPORATION (A FLIR COMPANY) warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact information.
Garantie (Français) EXTECH APPAREILS CORPORATION (Une société FLIR) garantit que cet appareil est exempt de défauts matériels et de fabrication pendant un an à compter de la date d’envoi (une garantie limitée de six mois s’applique aux capteurs et câbles). Si le renvoi de l’appareil pour réparation devient nécessaire durant ou après la période de garantie, contactez le service client au (781) 890-7440 poste. 210 pour autorisation ou visitez notre site Web à l’adresse www.extech.
