BK Precision 8500 User Manual Download Page 52

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Most significant two bytes, most significant byte

Higher high byte

As an example, for the integer 0x23A749F5, we'd have

1st byte

0xF5

Lower low byte

2nd byte

0x49

Lower high byte

3rd byte

0xA7

Higher low byte

4th byte

0x23

Higher high byte

0x12 Indicates a return packet for a command sent to the DC Load

Byte

offset

Meaning

Status byte (i.e., status of last command sent to DC Load).

4-24

Reserved

Below is a table of all possible status byte values and their corresponding indication.

0x90

Checksum incorrect

0xA0

Parameter incorrect

0xB0

Unrecognized command

0xC0

Invalid command

0x80

Command was successful

0x20 Set the DC Load to remote operation

Byte

offset

Meaning

0 means front panel operation.
1 means remote operation.

4-24

Reserved

0x21 Turn the load ON or OFF

Byte

offset

Meaning

0 is OFF.
1 is ON.

4-24

Reserved

0x22 Set the maximum voltage allowed

Byte

offset

Meaning

Lower low byte of maximum voltage. 1 represents 1 mV.

Lower high byte of maximum voltage.

8500 DC Load Series

Version: February 4, 2009

Page 52 of 76

Summary of Contents for 8500

Page 1: ...USER MANUAL 8500 SERIES DC ELECTRONIC LOADS Models 8500 8502 8510 8512 8514 8518 8520 8522 8524 8526 ...

Page 2: ... not remove instrument covers Component replacement and internal adjustments must be made only by qualified service personnel Do not replace components with the power cable connected Under certain conditions dangerous voltages may exist even with the power cable removed To avoid injuries always disconnect power discharge circuits and capacitors and remove external voltage sources before touching c...

Page 3: ...23 Items you should have received 23 Instrument location 23 Outline Drawings 23 Bench operation 26 First turn on checkout 27 Operational introduction 28 Power on state 29 Constant current mode 29 Constant voltage mode 30 Constant power mode 30 Constant resistance mode 31 Timed operation 31 Changing display resolution 32 Increasing current resolution 32 Increasing voltage resolution 32 Short 32 Bat...

Page 4: ...l converter cable IT 131 standard 44 USB to TTL serial converter cable IT 132 option 44 RS 232 settings 45 Overview of DC Load programming 45 Packet structure 45 Status packets 46 Chapter organization 48 Summary of commands 49 Command details 51 Serial number and firmware version 71 In case of trouble 72 Instrument won t turn on 72 Error messages during power up 72 Keypad unlock procedure Keypad w...

Page 5: ...anel 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 CONFIG Menu item OFF Default menu item 8500 DC Load Series Version February 4 2009 Page 5 of 76 ...

Page 6: ...s are 6 rack mount kit IT E151 7 TTL to USB serial adapter IT 132 Overview of instrument The DC Load is a two terminal device that can be connected to DC sources Here a DC source is a voltage that is always positive on the DC Load s terminal referenced to the terminal DC Electronic Loads are used for design manufacturing and evaluation of DC power supplies batteries and power components Other appl...

Page 7: ...nstrument for static and dynamic testing of power supplies batteries DC to DC converters and battery chargers Typical tasks To perform the following tasks consult the indicated sections Task Section s Manual on off CC CV CW or CR test Constant current mode Constant voltage mode Constant power mode Constant resistance mode Timed on off CC CV CW or CR test Constant current mode Constant voltage mode...

Page 8: ...ons 6 Input terminals Depending on the model you will have different types and numbers of input terminals Models 8500 8502 come with one plus and one minus terminal Models 8510 8512 come with two positive and two negative terminals however each terminal is able to sink the maximum current supported by the instrument Thus it is not necessary to double up on the wires when sinking a high current unl...

Page 9: ...er mode R set Choose constant resistance mode Shift A Set the current mode s load value from the A value of the corresponding transient operation See the Transient operation section This key does not work when the TRAN annunciator is on Shift B Set the current mode s load value from the B value of the corresponding transient operation See the Transient operation section This key does not work when...

Page 10: ...key Scroll down key 0 to 9 Enter the digits 0 to 9 Decimal point Esc The escape key It can be used to exit keyboard entry or move up a level in the menu Enter Enter the selected value or setting Rear panel Your instrument s rear panel may look different from the following figure but the same functionality will be present 4 1 2 3 1 3 pin IEC320 AC input connector 2 4 pin trigger and remote sensing ...

Page 11: ...tor will stay lit for approximately 3 seconds after the last remote communication with the DC Load RMT Instrument is in the remote state The only active key is the Local key This is set with the 0x20 remote command see the Remote programming section SHIFT The Shift key has been pressed LOCK The keyboard is locked by a password Menus Use Shift Menu to enter the menus Lvl indicates the menu level wh...

Page 12: ...uick recall of a setup by pressing the number key 3 OFF Pressing a number key does not recall a setup 2 RANGE SELECT Change the precision of displayed values 3 ON Allows the user to select the instrument s range giving better voltage and or current resolution Press Shift or Shift to toggle resolutions 3 OFF Current and voltage measurement resolution are fixed 2 REMOTE SENSE See the Remote sense se...

Page 13: ...ing this value will cause the load to shut off This value also becomes the maximum power you can set 2 MAX VOLTAGE SET Set the maximum allowed voltage Exceeding this value will cause the load to shut off This value also becomes the maximum voltage you can set 2 VOLTAGE ON SET Used to set an ON voltage threshold See the Voltage threshold section 2 VOLTAGE OFF SET Used to set an OFF voltage threshol...

Page 14: ...st files section for more details 2 LIST STORE MODE Set how the nonvolatile memory is partitioned to store lists You can choose between numerous short lists or fewer longer lists 3 8 X 120 STEPS 3 4 X 250 STEPS 3 2 X 500 STEPS 3 1 X 1000 STEPS 2 EXIT Return to prior menu level 1 LOAD ON TIMER Enable a timed load 2 TIMER STATE 3 ON When the load timer is enabled by this menu element the load is tur...

Page 15: ... mV 0 120 V 0 500 V 0 02 0 025 FS 10 mV Models 8510 8512 8514 8518 1200 2400 W Parameter 8510 8512 8514 8518 Input rating Voltage 0 120 V 0 500 V 0 120 V 0 60 V Current 0 120 A 0 30 A 0 240 A 0 240 A Power 600 W 1200 W 8510 8512 8514 8518 common characteristics Parameter Range 8510 8512 8514 8518 Accuracy Resolution CV Mode Regulation 0 1 18 V 0 05 0 02 FS 1 mV 0 1 V to Vmax 0 05 0 025 FS 10 mV CC...

Page 16: ...curacy Resolution CR Mode Regulation Input current FS 10 Input Voltage FS 10 0 1 10 Ω 1 0 3 FS 0 001 Ω 10 99 Ω 1 0 3 FS 0 01 Ω 100 999 Ω 1 0 3 FS 0 1 Ω 1K 4 KΩ 1 0 8 FS 1 Ω CW Mode Regulation Input current FS 10 Input Voltage FS 10 0 100 W 1 0 1 FS 1 mW 100 W max Power 1 0 1 FS 100 mW Power Measurement Input current FS 10 Input Voltage FS 10 0 100 W 1 0 1 FS 1 mW 100 max Power 1 0 1 FS 100 mW Batt...

Page 17: ...rature 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 5 8526 15 Operational power curve The DC load s output follows a power curve illustrated below 8500 DC Load Series Version February 4 2009 Page 17 of 76 ...

Page 18: ...aximum 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 Low Voltage Characteristics The following graphs show the voltage current relationships for low voltages 8500 DC Load Series Version February 4 2009 Page 18 of 76 ...

Page 19: ...slew rate would be measured with current transition from 0 A to 30 A Note The graph below illustrates slew rate measurements In general the indicated slew rates in the table below are measured based on the maximum current range each model is able to handle Between the 10 and 90 region the slew rate can be measured by observing the steepest slope portion The indicated measured time would be used to...

Page 20: ...table of slew rates for their respective models Model Slew rate 8500 0 5A S 8502 0 5A S 8510 1A S 8512 0 5A S 8514 1A S 8518 1A S 8520 1A S 8522 1A S 8524 1A S 8526 1A S 8500 DC Load Series Version February 4 2009 Page 20 of 76 ...

Page 21: ... indicated value or setting Esc Stop current entry and go to previous menu level I set Configure the instrument for constant current mode Knob click Press the knob in until it clicks This is an alternate method for changing settings Link This annunciator will light up when communications are coming in across the serial interface It will stay lit for approximately 3 seconds after the last command w...

Page 22: ...mode Shift Shift key which allows access to the functions written beneath the number keys Short Toggles between normal operation and a low resistance short Store Allows the user to save the instrument state in non volatile memory Test file A sequence of different test modes used for automated testing Tran Set to transient condition Transient condition See Condition Trigger The key that causes an i...

Page 23: ...nt Please refer to the specifications table for the allowable environment operating limits Significant power may be dissipated in the DC Load which includes one or more thermostatically operated fans The fans draw air through the bottom and sides and exhaust it out the back It is important to allow at least 25 mm 1 inch of clearance on all sides of the instrument so adequate cooling airflow can be...

Page 24: ...Models 8510 8512 8514 8518 Models 8520 8522 8500 DC Load Series Version February 4 2009 Page 24 of 76 ...

Page 25: ...Models 8524 8526 Unit mm 8500 DC Load Series Version February 4 2009 Page 25 of 76 ...

Page 26: ...D 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 A rack mounting kit IT E151 is also available 8500 DC Load Series Version February 4 2009 Page 26 of 76 ...

Page 27: ...DC Load observing the polarity Turn the power supply on and set a voltage of 1 volt On the DC Load press the On Off button You should see approximately 0 1 A of current flowing as shown by the instrument s ammeter and approximately 1 volt The CC annunciator should be displayed showing that the instrument is in the constant current mode The instrument s voltage display may read a bit less than the ...

Page 28: ...o OFF and the newly selected mode s setting will be displayed for about 3 seconds Pressing the same mode button again will prompt for the new constant value for the selected mode There are three operational conditions for the instrument in these modes steady state transient and dynamic Condition Behavior Steady state The selected mode parameter is maintained at a constant value For example if you ...

Page 29: ...L CONFIG INPUT RECALL POWER ON RECALL Enter OFF DEFAULT ON Enter POWER ON RECALL Esc CONFIG Esc Standard voltage current display Constant current mode In constant current mode the DC load will sink a constant current regardless of the voltage at its terminals To set up the DC Load to operate in constant current mode and in the steady state condition use the following keystrokes 8500 DC Load Series...

Page 30: ...s Key Display V set If you press this key after powering up and there is no currently stored constant voltage value you ll be prompted for the desired voltage level If there was a voltage value already stored it will be momentarily displayed and the instrument will be in CV mode If you wish to change the voltage setting press V set again The OFF annunciator will be displayed On Off Turns the const...

Page 31: ...t If you press this key after powering up and there is no currently stored constant resistance value you ll be prompted for the desired resistance If there was a resistance value already stored it will be momentarily displayed and the instrument will be in CR mode If you wish to change the resistance setting press R set again The OFF annunciator will be displayed On Off Turns the constant resistan...

Page 32: ...o the lower range press Shift You may see OVERVOLTAGE message on the display if the voltage is too high To change back to the lower voltage resolution press Shift again Short When a test mode is on you may press Shift Short to emulate a short This will draw maximum current from the DC supply in any of the four operation modes CC CV CW or CR In CC CV or CR mode you may press Shift Short to stop the...

Page 33: ...e OFF annunciator or Display the total charge delivered by the battery in ampere hours A hrs Shift Battery Turns battery testing mode off NOTE you must make sure that you press Shift Battery at the end of the test Otherwise the instrument will not respond to any key presses except or Transient operation The transient condition allows switching between two different load values There are three diff...

Page 34: ... the two Tran values with the timing you entered Pulse transient operation In pulse transient operation the load operates at the A value that has been entered until a trigger is received At the trigger the load switches to the B value and stays at that level for the B timing value Then the load switches back to the A value and stays there until another trigger is received Here s an example 10A 5A ...

Page 35: ... the instrument with a software trigger Toggled transient operation In toggled transient operation the load starts at the stored parameter for the mode When a trigger is received the load switches to the B value When another trigger is received the load switches to the A value It stays at the A value until another trigger is received at which point it switches to the B value Further triggers cause...

Page 36: ...th a software trigger Toggle between two test values When you have entered A and B values through the Shift S Tran menu those values are available to you at the front panel Suppose you set the instrument to operate in CC mode at a current of 1 A If the transient A level was 5 A and the transient B level was 10 A you can set the instrument to the A level by pressing Shift A The load has to be on an...

Page 37: ...n for the first step Enter 1000 1000 Enter Repeat the current and duration entry for the following 4 steps Enter STORE LIST FILE1 The 1 is underlined indicating you can enter a number to specify the file i e block of EEPROM to store this list to Choose a number via the keypad or the knob You can choose any number between 1 8 Enter EDIT LIST FILE Esc Esc Standard display First press the On Off key ...

Page 38: ...20 steps 2 Enter CONST CURRENT Since our first test is in constant current mode we ll just press Enter to select this mode Enter SET 1 0 210A This is the prompt for the constant current value We set it to 0 35 A 35 Enter SHORT OFF We can turn a short on or off at this step Here we want short off so we just press Enter Enter READBACK V We re being prompted for what parameter to read back and check ...

Page 39: ...ompted for which file number to recall Since we saved to file number 1 we just press Enter Enter CALL TEST FILE The test file is now loaded so we return to the normal display Esc Esc Exit the menu The normal display is show V and A Shift I set NAME TEST FILE 1 We ve entered automatic testing mode The display is showing which test file we re using Shift Trigger This starts the test You ll see the v...

Page 40: ... VOLTAGE ON SET and SYSTEM SET VOLTAGE OFF SET both to 1 0 V Set the instrument to constant current mode with the I set key and set the current level to 0 1 A Turn the load on by pressing the On Off key When power is applied to the DC Load the voltage must rise above 1 0 V before the load draws current from the source If the voltage drops below 1 0 V on the load s terminals the load will stop draw...

Page 41: ... CR CC or CW mode the load current will be limited by a current limit value set by the user The maximum current limit value is equal to the maximum rated current for each model Once the maximum current limit is reached the DC Load will enter the over current protection state and the current will be limited to the set value The input will not turn off If the DC load previously operated CR or CW mod...

Page 42: ...remote sensing you can sense the voltage at the power supply s terminals effectively removing the effect of the voltage drop in the connection wire When using remote sensing the power displayed by the instrument includes both the power dissipated inside the instrument and the power dissipated in the leads from the power supply to the DC Load s input terminals To turn remote sensing on Keys Display...

Page 43: ...at 5 A can be calculated as 1 21 W Saving and Recalling settings The DC Load provides 25 non volatile registers to save instrument settings for recall later To save the instrument s settings to a register press Shift Store You ll be prompted for a register number Enter a number between 1 and 25 then press the Enter key The settings are saved Note that this will overwrite any values previously save...

Page 44: ...9666668889942311 IT The LEDs in the adapter will blink when information is sent through the adapter This is a good way to tell if your communication link is active USB to TTL serial converter cable IT 132 option The IT E132 adapter allows you to talk to the DC load via your Windows computer s USB interface To use this interface you must install the software driver that came with the IT E132 adapte...

Page 45: ...ated 3 Byte numbering is zero based meaning numbering starts with 0 The structure of each 26 byte packet is Byte 0 Byte 1 Byte 2 Byte 3 to 24 Byte 25 0xAA Address Command Command s data Checksum Thus the first byte of any command packet or returned packet is always 0xAA Address must be a byte that is between 0x00 and 0xFE Setting of the address is optional It is not required to communicate with th...

Page 46: ...ther text based languages like C C About Python Python is a dynamic object oriented programming language that can be used for various kinds of software development It offers strong support for integration with other languages and tools comes with extensive standard libraries and is easy to learn in a few days time Python is distributed under an OSI approved open source license that makes it free t...

Page 47: ...se length_packet print Response DumpCommand response main The first three lines of the main function set up a serial port to talk to The next five lines construct the string that we will send to the DC load The chr function creates a single character that has the ASCII value of the argument The symbols allow strings to be concatenated The expression chr 0 a_number creates a string of ASCII 0x00 ch...

Page 48: ... turned on immediately after running the script You will also see the Link annunciator light up while communications are going on then blink out after a few seconds Press Shift Local to set the DC load back to local mode We ve learned two key things about the DC load 1 Commands are always sent as 26 byte packets 2 For any command you send to the DC load you must also request the return of a 26 byt...

Page 49: ...e maximum power allowed 0x27 Read the maximum power allowed Operation mode 0x28 Set CC CV CW or CR mode 0x29 Read the mode being used CC CV CW or CR Mode parameters 0x2A Set CC mode current 0x2B Read CC mode current 0x2C Set CV mode voltage 0x2D Read CV mode voltage 0x2E Set CW mode power 0x2F Read CW mode power 0x30 Set CR mode resistance 0x31 Read CR mode resistance Transient parameters 0x32 Set...

Page 50: ...ory partitioning for storing lists 0x4B Read the memory partitioning for storing list steps 0x4C Store the list file 0x4D Recall the list file Battery testing 0x4E Set minimum voltage in battery testing 0x4F Read minimum voltage in battery testing LOAD ON 0x50 Set timer value of for LOAD ON 0x51 Read timer value for LOAD ON 0x52 Disable enable timer for LOAD ON 0x53 Read timer state for LOAD ON Ad...

Page 51: ...s Since the first three bytes of a command are i the constant 0xAA ii the instrument address and iii the command we will not show those for each command In addition the 26th byte the checksum will also not be shown The table includes a column for Byte offset This is the zero based index of the byte in the packet Note the offset numbers are in decimal A table entry of Reserved means the data are cu...

Page 52: ...f all possible status byte values and their corresponding indication 0x90 Checksum incorrect 0xA0 Parameter incorrect 0xB0 Unrecognized command 0xC0 Invalid command 0x80 Command was successful 0x20 Set the DC Load to remote operation Byte offset Meaning 3 0 means front panel operation 1 means remote operation 4 24 Reserved 0x21 Turn the load ON or OFF Byte offset Meaning 3 0 is OFF 1 is ON 4 24 Re...

Page 53: ...ge 6 Upper high byte of maximum voltage 7 24 Reserved 0x24 Set the maximum current allowed Byte offset Meaning 3 Lower low byte of maximum current 1 represents 0 1 mA 4 Lower high byte of maximum current 5 Upper low byte of maximum current 6 Upper high byte of maximum current 7 24 Reserved Example Suppose you want to set the maximum current to 3 12A Since 1 represents 0 1mA 3 12A translates to 31 ...

Page 54: ... to 213 450 in decimal With 4 bytes in Hex that would be 0x000341CA Since the bytes are ordered in little endian format 0xCA would be the 3rd byte 0x41 the4th byte 0x03 as 5th byte and 0x00 as the 6th byte 0x27 Read 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...

Page 55: ...fset 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 0x2C Set CV mode voltage Byte offset Meaning 3 Lower low byte of voltage 1 represents 1 mV 4 Lower high byte of voltage 5 Upper low byte of voltage 6 Upper high byte of voltage 7 24 Reserved 0x2D Read CV mode voltage Byte offset Meaning 3 ...

Page 56: ... 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 0x30 Set CR mode resistance Byte offset Meaning 3 Lower low byte of resistance 1 represents 1 Ω 4 Lower high byte of resistance 5 Upper low byte of resistance 6 Upper high byte of resistance 7 24 Reserved 0x31 Read CR mode resistance Byte offset Meaning...

Page 57: ...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 15 Transient operation 0 is CONTINUOUS 1 is PULSE 2 is TOGGLED 16 24 Reserved 0x34 Set CV mode transient voltage...

Page 58: ...ing 3 to 6 Value A of power in units of 1 mW Little endian 4 byte number 7 to 8 Time for A power in units of 0 1 ms Little endian 2 byte number 9 to 12 Value B of power in units of 1 mW Little endian 4 byte number 13 to 14 Time for B power in units of 0 1 ms Little endian 2 byte number 15 Transient operation 0 is CONTINUOUS 1 is PULSE 2 is TOGGLED 16 24 Reserved 0x37 Read CW mode transient paramet...

Page 59: ...TINUOUS 1 is PULSE 2 is TOGGLED 16 24 Reserved 0x39 Read CR mode transient parameters Byte offset Meaning 3 to 6 Value A of resistance in units of 1 Ω 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 Ω Little endian 4 byte number 13 to 14 Time for B resistance in units of 0 1 ms Little endian 2 byte ...

Page 60: ...T Byte offset Meaning 3 How lists repeat 0 is ONCE 1 is REPEAT 4 24 Reserved 0x3D Read how lists repeat ONCE or REPEAT Byte offset Meaning 3 How lists repeat 0 is ONCE 1 is REPEAT 4 24 Reserved 0x3E Set the number of list steps Byte offset Meaning 3 to 4 2 byte little endian integer for number of steps 5 24 Reserved 0x3F Read the number of list steps Byte offset Meaning 3 to 4 2 byte little endian...

Page 61: ...little endian integer specifying which step number in the list 5 to 8 4 byte little endian integer specifying the voltage in units of 1 mV 9 to 10 2 byte little endian integer specifying the step timing in units of 0 1 ms 11 24 Reserved 0x43 Read one of the step s voltage 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 ...

Page 62: ...1 Ω 9 to 10 2 byte little endian integer specifying the step timing in units of 0 1 ms 11 24 Reserved 0x47 Read one of the step s resistance 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 resistance in units of 1 Ω 9 to 10 2 byte little endian integer specifying the step timing in u...

Page 63: ... Byte offset Meaning 3 Storage location a one byte integer from 1 to 8 This number must be consistent with the number of list files allowed as set by the 0x4A command 4 24 Reserved 0x4D Recall the list file Byte offset Meaning 3 Storage location a one byte integer from 1 to 8 4 24 Reserved 0x4E Set minimum voltage in battery testing Byte offset Meaning 3 to 6 4 byte little endian integer specifyin...

Page 64: ...isable enable timer for LOAD ON Byte offset Meaning 3 0 is disable timer 1 is enable timer 4 24 Reserved 0x53 Read timer state for LOAD ON Byte offset Meaning 3 0 is disable timer 1 is enable timer 4 24 Reserved 0x54 Set communication address Byte offset Meaning 3 2 byte little endian integer specifying the address Must be between 0 and 0xFE inclusive 4 24 Reserved 0x55 Enable disable LOCAL contro...

Page 65: ...Byte offset Meaning 3 Trigger 0 means immediate trigger i e triggered from the front panel 1 means external trigger from the rear panel connector 2 means a bus software trigger the 0x5A command 4 24 Reserved 0x59 Read trigger source Byte offset Meaning 3 Trigger 0 means immediate trigger i e triggered from the front panel 1 means external trigger from the rear panel connector 2 means a bus softwar...

Page 66: ...TERY Byte offset Meaning 3 Function 0 means FIXED 1 means SHORT 2 means TRANSIENT 3 means LIST 4 means BATTERY 4 24 Reserved 0x5F Read input voltage current power and relative state Byte offset Meaning 3 to 6 4 byte little endian integer for terminal voltage in units of 1 mV 7 to 10 4 byte little endian integer for terminal current in units of 0 1 mA 11 to 14 4 byte little endian integer for termi...

Page 67: ... Reversed voltage is at instrument s terminals 1 means yes 1 Over voltage 1 means yes 2 Over current 1 means yes 3 Over power 1 means yes 4 Over temperature 1 means yes 5 Not connect remote terminal 6 Constant current 7 Constant voltage 8 Constant power 9 Constant resistance 0x60 Enter instrument calibration state Byte offset Meaning 3 Calibration state 0 means disable 1 means enable 4 0x85 low by...

Page 68: ...ration program Byte offset Meaning 3 to 6 4 byte little endian integer representing the voltage in units of mV 7 24 Reserved 0x64 Set current calibration point index Byte offset Meaning 3 Current calibration point Valid values are 0x01 to 0x04 4 24 Reserved The DC Load has four calibration points for current These would typically span the full range of the instrument s current range 0x65 Send the ...

Page 69: ...ion representing the calibration 23 24 Reserved 0x69 Restore the factory default calibration data Byte offset Meaning 3 24 Reserved 0x6A Get product s model serial number and firmware version Byte offset Meaning 3 to 7 ASCII model information 8 Low byte of firmware version number 9 High byte of firmware version number 10 to 19 Instrument s serial number in ASCII 20 24 Reserved 0x6B Read the bar co...

Page 70: ...Byte offset Meaning 12 24 Reserved 8500 DC Load Series Version February 4 2009 Page 70 of 76 ...

Page 71: ...ST 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 Instrument s capabilities SN XXX XXX XXX Serial number VER X XX Firmware version Press the Esc key to return to normal operation of the instrument 8500 DC Load Series Version February 4 2009 Page 71 of 76 ...

Page 72: ...AC T0 1 25A 250 VAC 8522 T2 5A 250 VAC T0 1 25A 250 VAC 8524 T5A 250 VAC T2 5A 250 VAC 8526 T5A 250 VAC T2 5A 250 VAC WARNING Ensure that the fuse is rated for 250 VAC operation Lower voltage rated fuses are not suitable for this instrument Error messages during power up EEPROM ERROR means the calibration data have been lost or the EEPROM is not functional ERROR CAL DATA means that the calibration...

Page 73: ...the menu To unlock the other DC load models use the following unlock keys Model number Unlock key code 8500 8512 8502 8512 8510 8513 8512 8513 8514 8514 8518 8518 8520 8516 8522 8516 8524 8518 8526 8518 8500 DC Load Series Version February 4 2009 Page 73 of 76 ...

Page 74: ... www bkprecision com 714 921 9095 Include with the returned instrument your complete return shipping address contact name phone number and description of problem LIMITED ONE YEAR WARRANTY B K Precision Corp warrants to the original purchaser that its products and the component parts thereof will be free from defects in workmanship and materials for a period of one year from date of purchase B K Pr...

Page 75: ...ynamic condition 21 Enter 10 13 Esc 10 12 I set 21 List 11 13p 21 36 Local 11 21 Menu 8 12 21 Menu system 10 Mode 21 Mode settings 29 P set 21 Present a constant resistance 6 R set 22 Recall 10 12 22 43 Remote sensing 11p 22 42 Resistance 31 Resistance 31 S Tran 22 Shift 11 22 Shift 32 Shift 32 Short 10 12 22 32 Standard display 34pp Store 10 22 Tran 22 Transient condition 22 Transient mode 21 Tri...

Page 76: ...22820 Savi Ranch Parkway Yorba Linda CA 92831 Printed in China 8500 DC Load Series Version February 4 2009 Page 76 of 76 ...

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