USER MANUAL 8500 SERIES DC ELECTRONIC LOADS Models 8500, 8502, 8510, 8512, 8514, 8518, 8520, 8522, 8524 & 8526
Safety The following general safety precautions must be observed during all phases of operation of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. B&K Precision assumes no liability for the customer’s failure to comply with these requirements. Verify that all safety precautions are taken. Note the instrument's external markings described under "Safety Symbols".
Table of Contents Safety......................................................................................................................................................2 Safety Symbols...................................................................................................................................2 Notation...................................................................................................................................................5 Quick reference.................
Triggering..........................................................................................................................................39 Voltage threshold operation..............................................................................................................40 Passwords........................................................................................................................................40 Protection features......................................................
Notation I-set Represents a key on the front panel. Note that some of these may be accessed in combination with the Shift key. OFF Annunciator, value, or message shown on the vacuum fluorescent display.
Quick reference Model numbers covered by this document The B&K Precision DC Loads covered by this manual are: ● ● ● ● ● ● ● ● ● ● 8500 8502 8510 8512 8514 8518 8520 8522 8524 8526 Unless otherwise noted, this document will refer to all of these instruments as the DC Load. Instrument differences, where appropriate, will be noted. Options and accessories The items included with the instrument are: 1. Power cord 2. User manual 3.
whose resistance doesn't change as a function of current or voltage). The DC Load can present dynamically changing loads to the DC source with millisecond switching times. The DC Load can be remotely programmed via a serial interface (RS-232 or USB). Versatile triggering options allow the dynamic load behavior to be synchronized with other events. A battery test mode is provided that will measure the ampere*hour (A*hr) characteristic of a battery.
2 1 3 4 6 5 Button Function(s) 1 16-character display shows voltage and current measurements. Rotary knob. Turn to adjust a setting value. Press in to toggle between setting the currently-selected mode's value and reading the voltage and current, as shown in the above picture. Power switch to turn the instrument on or off. Numeric keypad: Numeric entry keys. Secondary key functions. Keypad: Enable/disable input. Set up the current, voltage, power, and resistance modes.
Standard display The standard display for the instrument is the voltage and current at the instrument's terminals. You may press the △ or ▽ keys to see the instantaneous power and the mode's parameter setting.
Shift + Menu Shift + Short Shift + Tran Shift + Trigger Shift + Battery Shift + S-Tran On/Off Shift △ ▽ 0 to 9 • Esc Enter Enter the instrument's menu system. Turn short circuit on or off. Start or stop transient condition. Causes an immediate trigger. Turn on or off battery testing function (measures battery capacity in ampere*hours). Set transient condition parameters. Turns DC Load ON or OFF (OFF is high impedance state).
4 not covered by warranty. Line voltage selection switch (110 VAC or 220 VAC) Display annunciators Annunciator OFF UNREG CC CV CW CR PROT TRAN LIST SENSE LIMIT ERROR LINK RMT SHIFT LOCK Meaning The load is off. The input is unregulated. Constant current mode. Constant voltage mode. Constant power mode. Constant resistance mode. Not used. Transient operation is enabled. List mode is initiated or running. Remote sensing is on. Not used. An error has occurred.
Lvl Menu item 2 2 3 INITIAL CONFIG POWER-ON RECALL ON 3 2 OFF INPUT RECALL 3 ON 3 OFF 2 3 3 2 3 3 2 ON OFF KNOB LOCK SET ON OFF SHORT CUT RECALL ON 3 OFF RANGE SELECT 3 ON 3 OFF 2 3 3 2 3 3 Return instrument to factory default settings. Power on state of instrument. Remembers state at last power-down. Does not remember state at last power-down. Remember whether load was ON If load was ON prior to turning the power off, the ON state will be resumed after power on.
Lvl 2 3 3 3 3 2 Menu item BAUDRATE SET 9600 19200 38400 COMM. PARITY SET NONE 3 3 EVEN ODD 2 ADDRESS SET 2 KEY LOCK SET EXIT SYSTEM SET 2 MAX CURRENT SET 2 MAX POWER SET 2 MAX VOLTAGE SET 2 VOLTAGE ON SET 2 VOLTAGE OFF SET 2 1 2 3 EXIT LIST SET MODE SET FIXED MODE 3 LIST MODE 2 3 CALL LIST FILE RECALL N 2 EDIT LIST FILE 3 4 Set the serial bus connection speed. 4800 3 2 1 Function CURRENT LIST ONCE 8500 DC Load Series Serial connection parity. Set the instrument's address.
Lvl Menu item Function 4 3 4 4 3 4 4 3 4 4 2 3 2 REPEAT VOLTAGE LIST ONCE REPEAT POWER LIST ONCE REPEAT RESISTANCE LIST ONCE REPEAT CALL TEST FILE RECALL N EDIT TEST FILE List is repeatedly executed after the trigger is received. 2 LIST STORE MODE 3 3 3 3 2 1 2 8 X 120 STEPS 4 X 250 STEPS 2 X 500 STEPS 1 X 1000 STEPS EXIT LOAD ON TIMER TIMER STATE 3 ON 3 OFF 2 TIMER SET 2 1 EXIT EXIT 8500 DC Load Series List is executed once per trigger.
Specifications Models 8500 & 8502 (300 W) Parameter 8500 0 to 120 V 1 mA to 30 A Voltage Current Power Input rating 8502 0 to 500 V 1 mA to 15 A 300 W 8500/8502 common characteristics Range Accuracy 8500 8502 0.1-18 V ±(0.05%+0.02% FS) 0.1 – 120 V 0.1 – 500 V ±(0.05%+0.025% FS) 0–3A 0–3A ±(0.1%+0.1% FS) 0 – 30 A 0 – 15 A ±(0.2%+0.15% FS) 0–3A 0–3A ±(0.1% + 0.1% FS) 8500: ±(0.2%+0.15% FS) 0 – 30 A 0 – 15 A 8502: ±(0.2%+0.3% FS) 0-18 V ±(0.02% + 0.02% FS) 0-120 V 0 – 500 V ±(0.02% + 0.
Models 8520/8522/8524/8526 (2400W & 5000W) Parameter Input rating Parameter CV Mode Regulation CC Mode Regulation Current Measurement Voltage Measurement 8520 Voltage Current Power 8522 0 – 120 V 0 – 500 V 0 – 240 A 0 – 120 A 2400 W 8524 0 – 60 V 0 – 240 A 8526 0 – 500 V 0 – 120 A 5000 W 8520/8522/8524/8526 common characteristics Range Accuracy 8520 8522 8524 8526 0.1-18 V ±(0.05%+0.02% FS) 0.1 V to Vmax ±(0.05%+0.025% FS) 0-24 A 0-12 A 0-24 A 0-12 A ±(0.1%+0.1% FS) 0 – max Current ±(0.2%+0.
Parameter Specification Humidity ≤ 95% relative humidity, non-condensing Altitude ≤ 2000 m AC Line voltage 220 AV±10%，47～63 Hz 110 AV±10%，47～63 Hz Operating temperature 0 – 40 ºC Storage temperature -10 – 60 ºC Internal Resistances The internal resistances of the DC load models are less than or equal to the following values: Model Internal Resistance(mΩ) 8500 ≤ 35 8502 ≤ 200 8510 ≤ 15 8512 ≤ 100 8514 ≤8 8518 ≤5 8520 ≤ 45 8522 ≤ 30 8524 ≤ 6.
The curved portion is where the dissipated power is at the rated power of the instrument (and is actually a hyperbolic shape). When you use the menu to set lower-than-maximum power or current, the operating region may look like the following: Note the gap between the operating region and the current axis for lower voltages. More detail is described in the following section.
Slew rate The slew rate for each DC load varies from model to model. The variations are also dependent on the different regions measured for each individual load. In general, the slew rate for low current transitions, say 0 to 0.5 A, is significantly lower than slew rate for current transitions from 30 to 70 A. The provided table below indicates measured slew rates based on the maximum range of current transition of the models are capable of.
As a reference, below is a table of slew rates for their respective models: 8500 DC Load Series Model Slew rate 8500 0.5A/ S 8502 0.5A/ S 8510 1A/ S 8512 0.
Glossary △ Up arrow key. Used to scroll through the menu or cause the temporary display of the alternate standard display. ▽ Down arrow key. Used to scroll through the menu or cause the temporary display of the alternate standard display. A Value for first setting of transient mode. B Value for second setting of transient mode. Battery Select battery testing mode. See Battery test section. CC Constant current Condition Steady state, transient, or dynamic.
R-set Configure the instrument for constant resistance mode. Recall Recall instrument state from non-volatile memory. Remote sensing Allows the instrument to measure the load power properly in case of large currents by sensing the voltage at the source, rather than at the instrument's terminals. This removes the effect of the resistance of long leads. S-Tran Set parameters (A, B, and transition times) for transient mode.
Installation Inspection Items you should have received When you open the box containing the instrument, you should find the following items: 1. 2. 3. 4. 5. 6. The DC Load instrument Power cord User manual Installation CD with application software PV8500 TTL to RS-232 serial converter IT-E131 Calibration report Instrument location This instrument is intended for indoor use in a pollution degree 2 environment. Please refer to the specifications table for the allowable environment operating limits.
Models 8510, 8512, 8514 & 8518 Models 8520, 8522 8500 DC Load Series Version: September 2, 2009 Page 24 of 76
Models 8524 & 8526 Unit (mm) 8500 DC Load Series Version: September 2, 2009 Page 25 of 76
Model number Dimensions in mm Mass in kg 8500 215W×88H×355D 5.2 8502 215W×88H×355D 5.2 8510 429W×88H×355D 14 8512 429W×88H×355D 14 8514 429W×88H×355D 14 8518 429W×88H×355D 14 8520 444W×180H×539D 30 8522 444W×180H×539D 30 8524 444W×357H×539D 67 8526 490W×357H×539D 67 Bench operation The 8500 DC Load is provided with a carrying handle. The following pictures demonstrate various ways to use the handle. The handle may be removed if desired.
First turn-on checkout CAUTION Ensure that the line voltage selector switch on the back panel is set to match your line voltage. Failure to do so could result in damage to the instrument. Connect an appropriate IEC power cord to the DC Load and plug the power cord into an AC power outlet. Ensure that nothing is connected to the INPUT terminals. Turn the instrument on by pushing the Power button in. The instrument should display SYSTEM SELFTEST, then display 0.00V 0.000A.
watt. Press the R-set button (you may have to press it twice). Set the resistance to 100 Ω. Press the On/Off key. Verify that the current is approximately the displayed voltage in V divided by 100. You can cycle between the four modes by pressing the I-set, V-set, P-set, and R-set buttons. Note that the previously-set values are remembered. If the instrument worked as explained above, you've demonstrated that the four operating modes of the instrument are working.
Steady state B Transient A Dynamic Repeat Time Power-on state The default power-on instrument state is to not remember the instrument mode settings before the last power-down.
Key Display I-set If you press this key after powering up and there is no currentlystored constant current value, you'll be prompted for the desired current level. If there was a current value already stored, it will be momentarily displayed and the instrument will be in CC mode. If you wish to change the current setting, press I-set again. The OFF annunciator will be displayed. On/Off Turns the constant current load on. The CC annunciator will be on.
Key Display power level. If there was a power value already stored, it will be momentarily displayed and the instrument will be in CW mode. If you wish to change the power setting, press P-set again. The OFF annunciator will be displayed. On/Off Turns the constant power load on. The CW annunciator will be on. △ or ▽ Momentarily display the power level and the set power value. On/Off Turns the load off. To operate the DC Load in CW mode in a transient condition, see the Transient operation section.
Key Display Enter :TIMER STATE Enter Use arrow keys to set to :ON. ▽ :TIMER SET Enter TIMER=XXXXXS Enter desired time interval. Valid values are 1 to 60000 seconds (1000 minutes). Enter :TIMER SET Esc Esc Standard display Now, when you turn a load on, it will stay on for the designated time, then turn off. To turn off timed operation, enter the menu :CONFIG:LOAD ON TIMER:TIMER STATE and set it to :OFF.
the battery) in ampere*hours (A*hrs) of the battery is calculated and displayed. To run a battery test, follow these steps: Key presses Display I-set, enter current value with numerical keys, then press Enter. Set the DC Load to constant current mode and set the current you want to draw from the battery. (You may have to press the I-set key twice to be able to set the current value.) Shift + Battery MIN VOLT= 0.
Keys Display Shift + S-Tran LEVEL A= X.XXXA You are being prompted for the first current value. Press the 5 key for 5 A. Enter Enters the 5 A value, then displays WIDTH A = X.XMS. You're being prompted for the duration of the 5 A load -- press the 3 key for 3 ms. Enter Enters the 3 ms value, then displays LEVEL B= X.XXXA. You are being prompted for the second current value. Press the 1 and 0 keys to enter 10 A. Enter Enters the 10 A value, then displays WIDTH B = X.XMS.
Keys Display current value. Press the 1 and 0 keys to enter 10 A. Enter Enters the 10 A value, then displays WIDTH B = X.XMS. You're being prompted for the duration of the 10 A load -- press the 1 and 0 key for 10 ms. Enter Enters the 10 ms duration, then displays :CONTINUOUS, :PULSE, or :TOGGLED. Use the △ or ▽ arrow keys to display :PULSE. Enter Returns to the standard display of voltage and current. To activate this pulse transient condition, press Shift + Tran, then press On/Off.
Keys Display Enter Displays LEVEL B= X.XXXA. You are being prompted for the second current value. Press the 1 and 0 keys to enter 10 A. Enter Enters the 10 A value, then displays WIDTH B = X.XMS. You're being prompted for the duration of the 10 A load. . In the toggled mode of operation, this width is ignored, so enter any convenient value Enter Displays :CONTINUOUS, :PULSE, or :TOGGLED. Use the △ or ▽ arrow keys to display :TOGGLED. Enter Returns to the standard display of voltage and current.
Current, A Duration, ms Between times 3 0 2 0 6 1000 800 500 300 500 0 and 1 1 and 2 2 and 3 3 and 4 4 and 5 This list has 5 steps, located at the transitions 1 through 5. The first duration, 1000 ms, occurs after the triggered event. Subsequent durations are from the previous transition to the current transition. Here are the keystrokes to set up this list: Keys Display Shift + Menu :CONFIG ▽ ▽ :LIST SET Enter :MODE SET Enter Select :LIST mode.
modes, mode parameters, and durations. They are useful for executing a set of tests on a device, then displaying whether the tests passed or failed. We will illustrate how to use test files by a short example. Suppose we have a small AC to DC power supply (a "wall-wart") and we want to set up an acceptance test for a number of these devices. Our test will consist of two steps: 1. Set the DC load to constant current mode to draw the rated current of 0.35 A from the device.
Keys Display 2.5 Enter SHORT OFF We select short on and then press Enter. ▽ Enter READBACK A We want to readback the current, so we press Enter. Enter MIN 2= 4.950A Our minimum value is 2.0 A. 2 Enter MAX 2= 5.050A We choose 2.5 A as the maximum value. 2.5 Enter DELAY 2= 3.0 We'll wait 2 seconds for the maximum current. 2 Enter STORE TEST FILE1 The 1 is underlined, meaning you can choose which test file number to store this test to. You can choose any number between 1-8.
Trigger Type Explanation front panel keys. EXTERNAL An external trigger is a TTL high signal applied to the Trigger connection on the back panel. This TTL signal must last for more than 5 ms. A trigger applied to this input can be used to change settings (voltage, current , resistance), toggle between settings in transienttoggle mode, or generate a pulse in pulse mode. BUS The instrument will be triggered if a 5AH command is sent via the RS232 interface.
To set these protection values, use the following keystrokes: Keys Display Shift + Menu :CONFIG ▽ :SYSTEM SET Enter Select between: :MAX CURRENT SET :MAX POWER SET :MAX VOLTAGE SET using the △ and ▽ arrow keys, then press Enter. Enter the desired value, then press Enter to accept it. Esc Esc Exit from the menu. Example: Suppose you are measuring current vs. voltage characteristics of a 1 watt resistor. You could set the maximum allowed power to 1.
Over Temperature protection If internal temperature exceeds safety limits (80℃;176°F), the Over temperature circuitry will be activated. The DC Load will turn off the input, the buzzer will sound, and the display will show OVERHEAT. Remote sensing Remote sensing is used to counteract the effect of lead resistance.
Example: A power supply is connected to the DC load with 72.5 cm of 20-gauge solid copper wires. The constant current i set to 5 A. The power supply's output meter reads 27.0 V and the DC Load's voltage display reads 26.71 V with a power dissipation of 133.70 W. This is without remote sensing enabled. With remote sensing turned on and the remote sensing terminals connected to the power supply output terminals, the DC Load reads 26.98 V and indicates 134.95 W of power dissipation.
Remote operation Communication cables The DC Load has a DB9 connector on the rear panel that allows remote communication. WARNING Do not connect the DC Load's DB9 connector to a standard RS-232 instrument. Doing so may damage the instrument, as the instrument requires TTL logic signals, not standard RS-232 voltages. Two adapters are available to perform the correct level shifting.
This COM port can then be accessed as if it were a regular RS-232 port. The LEDs in the adapter will blink when information is being sent through the adapter. This is a good way to tell if your communication link is active. RS-232 settings In order for the computer to communicate with the DC Load, both must be set to the same RS-232 settings. These communication settings are: 1. Baud rate must be one of 4800, 9600, 19200, or 38400. 2. 8 data bits. 3. One stop bit. 4. No parity.
The checksum number is the arithmetic sum of each of the bytes modulo 256. Status packets When you send a command that does not cause the DC Load to send requested information back to you, you will receive a status packet back.
if i % 10 == 0 and i != 0: print print header, if i % 5 == 0: print " ", s = "%02x" % ord(bytes[i]) if s == "00": s = chr(250)*2 print s, print def CalculateChecksum(cmd): assert((len(cmd) == length_packet - 1) or (len(cmd) == length_packet)) checksum = 0 for i in xrange(length_packet - 1): checksum += ord(cmd[i]) checksum %= 256 return checksum def main(): port = 3 # COM4 for my computer baudrate = 38400 sp = serial.
You can download a complete python program along with detailed documentation from our website at www.bkprecision.com Here are the printed results when the above script is ran: Set to remote command: aa ·· 20 01 ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· Response: aa ·· 12 80 ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· cb ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· 3c The · characters represent the bytes with a value of 0x00 . This makes it easier to see the nonzero bytes in the string.
Chapter organization The remainder of this chapter contains a reference on the syntax of DC Load commands and some example programs. The Summary of commands section is a list of the commands, but without details. The Command details section explains how to use each command. Summary of commands The Byte values in the following table are used to identify the commands to be sent in the command packet (byte 2).
Command Group Byte Action 0x3A Select the list operation (CC/CV/CW/CR) 0x3B Read the list operation (CC/CV/CW/CR) 0x3C Set how lists repeat (ONCE or REPEAT) 0x3D Read how lists repeat 0x3E Set the number of list steps 0x3F Read the number of list steps 0x40 Set one of the step's current and time values 0x41 Read one of the step's current and time values 0x42 Set one of the step's voltage and time values List operations 0x43 Read one of the step's voltage and time values 0x44 Set one of the step's power
Command Group Byte Action 0x5C Recall DC Load's settings 0x5D Select FIXED/SHORT/TRAN/LIST/BATTERY function Function 0x5E Get function type (FIXED/SHORT/TRAN/LIST/BATTERY) Read display values 0x5F Read input voltage, current, power and relative state 0x60 Enter instrument calibration state 0x61 Get the instrument calibration state 0x62 Set voltage calibration point index 0x63 Send the actual voltage to the calibration program Calibration 0x64 Set current calibration point index 0x65 Send the actual
Most significant two bytes, least significant byte Most significant two bytes, most significant byte Higher low byte Higher high byte As an example, for the integer 0x23A749F5, we'd have 1st byte 2nd byte 3rd byte 4th byte 0xF5 Lower low byte 0x49 Lower high byte 0xA7 Higher low byte 0x23 Higher high byte 0x12 Indicates a return packet for a command sent to the DC Load Byte offset 3 4-24 Meaning Status byte (i.e., status of last command sent to DC Load).
Byte offset Meaning 5 Upper low byte of maximum voltage. 6 Upper high byte of maximum voltage. 7-24 Reserved Example: Suppose you want to set the maximum voltage to 16.23V. Since 1 represents 1mV, therefore 16.23V translates to 16,230 in decimal. With 4 bytes in Hex, that would be 0x0003F66. Since the bytes are ordered in little-endian format, 0x66 would be the 3rd byte, 0x3F the 4th byte, 0x00 as 5th byte, and 0x00 as the 6th byte.
Byte offset Meaning 5 Upper low byte of maximum current. 6 Upper high byte of maximum current. 7-24 Reserved 0x26 Set the maximum power allowed Byte offset Meaning 3 Lower low byte of maximum power. 1 represents 1 mW. 4 Lower high byte of maximum power. 5 Upper low byte of maximum power. 6 Upper high byte of maximum power. 7-24 Reserved Example: Suppose you want to set the maximum power to 213.45W. Since 1 represents 1mW, 213.45W translates to 213,450 in decimal.
Byte offset 3 4-24 Meaning Mode: 0 is CC 1 is CV 2 is CW 3 is CR Reserved 0x2A Set CC mode current Byte offset Meaning 3 Lower low byte of current. 1 represents 0.1 mA. 4 Lower high byte of current. 5 Upper low byte of current. 6 Upper high byte of current. 7-24 Reserved 0x2B Read CC mode current Byte offset Meaning 3 Lower low byte of current. 1 represents 0.1 mA. 4 Lower high byte of current. 5 Upper low byte of current. 6 Upper high byte of current.
Byte offset Meaning 4 Lower high byte of voltage. 5 Upper low byte of voltage. 6 Upper high byte of voltage. 7-24 Reserved 0x2E Set CW mode power Byte offset Meaning 3 Lower low byte of power. 1 represents 1 mW. 4 Lower high byte of power. 5 Upper low byte of power. 6 Upper high byte of power. 7-24 Reserved 0x2F Read CW mode power Byte offset Meaning 3 Lower low byte of power. 1 represents 1 mW. 4 Lower high byte of power. 5 Upper low byte of power. 6 Upper high byte of power.
Byte offset Meaning 5 Upper low byte of resistance. 6 Upper high byte of resistance. 7-24 Reserved 0x32 Set CC mode transient current and timing Byte offset Meaning 3 to 6 Value A of current in units of 0.1 mA. Little-endian 4 byte number. 7 to 8 Time for A current in units of 0.1 ms. Little-endian 2 byte number. 9 to 12 Value B of current in units of 0.1 mA. Little-endian 4 byte number. 13 to 14 Time for B current in units of 0.1 ms. Little-endian 2 byte number.
Byte offset Meaning 0 is CONTINUOUS 1 is PULSE 2 is TOGGLED 16-24 Reserved 0x35 Read CV mode transient parameters Byte offset Meaning 3 to 6 Value A of voltage in units of 1 mV. Little-endian 4 byte number. 7 to 8 Time for A voltage in units of 0.1 ms. Little-endian 2 byte number. 9 to 12 Value B of voltage in units of 1 mV. Little-endian 4 byte number. 13 to 14 Time for B voltage in units of 0.1 ms. Little-endian 2 byte number.
Byte offset 15 16-24 Meaning Transient operation: 0 is CONTINUOUS 1 is PULSE 2 is TOGGLED Reserved 0x38 Set CR mode transient resistance and timing Byte offset Meaning 3 to 6 Value A of resistance in units of 1 mΩ. Little-endian 4 byte number. 7 to 8 Time for A resistance in units of 0.1 ms. Little-endian 2 byte number. 9 to 12 Value B of resistance in units of 1 mΩ. Little-endian 4 byte number. 13 to 14 Time for B resistance in units of 0.1 ms. Little-endian 2 byte number.
Byte offset Meaning 3 is constant resistance (CR) 4-24 Reserved 0x3B Read the list operation (CC/CV/CW/CR) Byte offset 3 4-24 Meaning List operation mode: 0 is constant current (CC) 1 is constant voltage (CV) 2 is constant power (CW) 3 is constant resistance (CR) Reserved 0x3C Set how lists repeat (ONCE or REPEAT) Byte offset 3 4-24 Meaning How lists repeat: 0 is ONCE 1 is REPEAT Reserved 0x3D Read how lists repeat (ONCE or REPEAT) Byte offset 3 4-24 Meaning How lists repeat: 0 is ONCE 1 is REPE
0x40 Set one of the step's current and time values Byte offset Meaning 3 to 4 2 byte little-endian integer specifying which step number in the list 5 to 8 4 byte little-endian integer specifying the current in units of 0.1 mA 9 to 10 2 byte little-endian integer specifying the step timing in units of 0.
0x45 Read one of the step's power and time values Byte offset Meaning 3 to 4 2 byte little-endian integer specifying which step number in the list 5 to 8 4 byte little-endian integer specifying the power in units of 1 mW 9 to 10 2 byte little-endian integer specifying the step timing in units of 0.
Byte offset 3 4-24 Meaning Partition scheme: 1 means 1 file of 1000 list steps 2 means 2 files of 500 list steps 4 means 4 files of 250 list steps 8 means 8 files of 120 list steps Reserved 0x4B Read the memory partitioning for storing list steps Byte offset 3 4-24 Meaning Partition scheme: 1 means 1 file of 1000 list steps 2 means 2 files of 500 list steps 4 means 4 files of 250 list steps 8 means 8 files of 120 list steps Reserved 0x4C Save the list file Byte offset 3 4-24 Meaning Storage location,
Byte offset 7-24 Meaning Reserved 0x50 Set timer value of for LOAD ON Byte offset Meaning 3 to 4 2 byte little-endian integer specifying the time in units of 1 second 5-24 Reserved 0x51 Read timer value for LOAD ON Byte offset Meaning 3 to 4 2 byte little-endian integer specifying the time in units of 1 second 5-24 Reserved 0x52 Disable/enable timer for LOAD ON Byte offset 3 4-24 Meaning 0 is disable timer 1 is enable timer Reserved 0x53 Read timer state for LOAD ON Byte offset 3 4-24 Meani
Byte offset Meaning 1 means to enable the Local key on the front panel 4-24 Reserved 0x56 Enable/disable remote sensing Byte offset 3 4-24 Meaning 0 means to disable remote sensing 1 means to enable remote sensing Reserved 0x57 Read the state of remote sensing Byte offset 3 4-24 Meaning 0 means remote sensing is disabled 1 means remote sensing is enabled Reserved 0x58 Select trigger source Byte offset 3 4-24 Meaning Trigger: 0 means immediate trigger (i.e.
Byte offset 3 4-24 Meaning Storage register, a number between 1 and 25 inclusive Reserved 0x5C Recall DC Load's settings Byte offset 3 4-24 Meaning Storage register, a number between 1 and 25 inclusive Reserved 0x5D Select FIXED/SHORT/TRAN/LIST/BATTERY function Byte offset 3 4-24 Meaning Function: 0 means FIXED 1 means SHORT 2 means TRANSIENT 3 means LIST 4 means BATTERY Reserved 0x5E Get function type (FIXED/SHORT/TRAN/LIST/BATTERY) Byte offset 3 4-24 Meaning Function: 0 means FIXED 1 means SHORT
The operation state register's bit meanings are: Bit Meaning 0 Calculate the new demarcation coefficient 1 Waiting for a trigger signal 2 Remote control state (1 means enabled) 3 Output state (1 means ON) 4 Local key state (0 means not enabled, 1 means enabled) 5 Remote sensing mode (1 means enabled) 6 LOAD ON timer is enabled 7 Reserved The demand state register's bit meanings are: Bit Meaning 0 Reversed voltage is at instrument's terminals (1 means yes) 1 Over voltage (1 means yes)
Byte offset 3 4-24 Meaning Calibration protection state: Bit 0: value of 0 means the calibration state is not protected Bit 0: value of 1 means the calibration state is protected Reserved 0x62 Set voltage calibration point index Byte offset 3 4-24 Meaning Voltage calibration point. Valid values are 0x01 to 0x04. Reserved The DC Load has four calibration points for voltage. These would typically span the full range of the instrument's voltage range.
The stored calibration data will be used the next time the DC Load is power cycled. 0x67 Set calibration information Byte offset Meaning 3 to 22 ASCII information representing the calibration. Example: you might wish to store the date and time of the calibration and the initials of the person who performed the calibration. 23-24 Reserved 0x68 Read calibration information Byte offset Meaning 3 to 22 ASCII information representing the calibration.
Byte offset 12-24 Meaning Reserved 8500 DC Load Series Version: September 2, 2009 Page 70 of 76
Serial number and firmware version To find out the serial number and firmware version of the DC load, turn the instrument on. While the SYSTEM SELFTEST message is displayed, quickly press and hold down the Shift key. By pressing the △ and ▽ keys, you will see the following information: 120V 30A 320W SN: XXX-XXX-XXX VER: X.XX Instrument's capabilities Serial number Firmware version Press the Esc key to return to normal operation of the instrument.
In case of trouble Instrument won't turn on If the instrument won't turn on when the POWER switch is pressed in, please ensure the power cord is plugged into the back of the instrument and the other end of the cord is plugged into a live AC power outlet. If the instrument still won't turn on, remove the power cord from the instrument. Open the fuse container on the rear panel and check the fuse for continuity.
Enter again. Now the password is cleared.
Appendix: Service and warranty information SERVICE INFORMATION Warranty Service: Please go to the service and support section on our website www.bkprecision.com to obtain an RMA #. Return the product in the original packaging with proof of purchase to the address below. . Clearly state on the RMA form the performance problem and return any leads, probes, connectors and accessories that you are using with the device. Non-Warranty Service: Please go to the service and support section on our website www.
Index Alphabetical Index Battery...............................................................21 Battery test...............................................7, 21, 32 CC.....................................................................21 Condition............................................................21 Constant current.................................9, 11, 21, 29 Constant power..................................9, 11, 21, 30 Constant resistance........................9, 11, 21p.
22820 Savi Ranch Parkway Yorba Linda CA, 92831 Printed in China 8500 DC Load Series Version: September 2, 2009 Page 76 of 76
