BK Precision 9120 Instruction Manual
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BK Precision 9120 Instruction Manual

BK Precision 9120 Instruction Manual

Single output programmable dc power supply
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Instruction Manual
Model 9120, 9121 & 9122
SINGLE OUTPUT PROGRAMMABLE DC POWER SUPPLY

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  • Page 1 Instruction Manual Model 9120, 9121 & 9122 SINGLE OUTPUT PROGRAMMABLE DC POWER SUPPLY...

  • Page 2: Table Of Contents

    Table of contents General Information ……………………………………………. Features …………………………………………………..……… Local Mode Operation ………………….……………………….. Front panel description ……………………………………………. Memory key ………………………………………………………. Storing states in front panel mode ………………………………… Recall key …………………………………………………………. Recalling states in front panel mode ……………………………… Limit key ………………………………………………………….. Modes of operation ……………………………………………….. Constant current operation ………………………………………...
  • Page 3 Table of contents OUTPut Subsystem ………………………………………………… SYSTem Subsystem ……………………………………………….. SOURce Subsystem ……………………………………………….. MEASure Subsystem ………………………………………………. TRIGger Subsystem ………………………………………………… Non_SCPI commands ………………………………………………. IEEE 488.2 commands ……………………………………………... SCPI Status Registers ……………………………………………….. Error Messages …………………………………………………… Command Errors …………………………………………………… Execution Errors …………………………………………………… Device-specific Errors ……………………………………………... Self-test Errors ……………………………………………………..

  • Page 4: General Information

    General Information Single output programmable DC power supplies. Output voltage is: 0 to 30.0 V for Model 9120 0 to 20.0 V for Model 9121 0 to 60.0 V for Model 9122 Output current is: 0 to 3.00 A for Model 9120 0 to 5.00 A for Model 9121...

  • Page 6: Features

    Features • Constant Voltage / Constant Current modes of operation This power supply can operate in either constant voltage or constant current modes. The passing from one mode of operation to another is automatic. The active mode of operation is indicated using two indicators: CV –...

  • Page 8: Local Mode Operation

    Local mode operation Front panel keys description Memory key Note: Memory location 00 is the “Power-up” state. When the unit is powered up, the power supply will set itself to the settings stored in location 00. Note: If you press the Recall button while turning the power on, the power supply will power up using memory location 01 parameters.
  • Page 9 Options are selected by pressing Memory key when the desired option is displayed. Memory menu overview Store State Store State option will store the current operating state without setting a name for this state. The state will be identified using location number in non-volatile memory and the default name.
  • Page 10 By pressing Memory key again, state name can be set. Important note! A state name must be set here, or the state will not be saved. When setting the name, selected digit has the cursor underneath it. Characters of the name are selected by rotating the knob. When desired ASCII character is displayed, you can pass to another digit selection using >...

  • Page 11: Storing States In Front Panel Mode

    Storing states in front panel mode To store an operating state in front panel mode you must follow the steps described bellow: 1. Set the power supply in the desired operating state Stored parameters are: voltage limit, voltage step, overvoltage protection level, state of overvoltage protection circuit, current limit, current step, voltage trigger value, current trigger value, trigger delay value, trigger source, stored state name, state of display, output state.
  • Page 12 and the power supply returns to normal mode. 4. Select Name State option In order to select this option , Memory key must be pressed again. NameState option will set a name for the the state to be saved. The saving action is realized by pressing Memory key. After that, Done message will be displayed.

  • Page 13: Recall Key

    Recall key This key is used to recall an operating state from the storage locations in non- volatile memory. You can recall any operating state from 100 different operating states stored in the non-volatile memory. The recalled state becomes the current operating state. By pressing Recall key, you enter in Recall menu.
  • Page 14 Exit Exit option allows you to leave the Recall menu, without changing anything. No Change message will be displayed and the power supply returns to the previous state (the state before entering Recall menu). Reset Reset option allows you to reset the power supply without switching off (for more details see Reset Values section).

  • Page 15: Recalling States In Front Panel Mode

    Recalling states in front panel mode To recall an operating state in front panel mode, you must follow the steps described bellow: 1. Enter the Recall menu By pressing Recall key, you enter the Recall menu. By turning the knob, following options are displayed: 01: State 1 02: Test_mode etc.

  • Page 16: Limit Key

    Limit key The power supply works in 2 modes: Ø Ø Limit mode Ø Ø Normal mode In limit mode limit values of voltage and current are displayed. These are the programmed values (from the front panel or over the remote interface). Limit key is used to get the power supply to limit mode.

  • Page 17: Modes Of Operation

    Modes of operation Depending on the application, the power supply can be used as a constant current source or as a constant voltage source. In order to understand constant current and constant voltage operation, a numeric example will be used. Let’s consider a resistor connected to the output terminals of the power supply (R resistor).
  • Page 18 When the resistor’s value decreases so the output current value becomes equal to the current limit value, power supply will go to constant current operation (see third row of the table). If the resistor value is R = 1 Ù, for U = 5V, using Ohm’s law the output current is 5A.

  • Page 19: Constant Current Operation

    Constant current operation In constant current operation, current values in limit mode and normal mode are the same, but voltage values are not. To set the power supply in constant current operation, you must follow the steps described bellow: 1. Select the limit values for voltage and current parameters (U ), depending on the application 2.
  • Page 20 8. Enable the output of the power supply By pressing On / Off key, you enable the output. Power supply goes to normal mode operation and CC indicator will be displayed. In this case constant current operation is active. If CV indicator will be displayed, you must set a higher value for voltage limit. Important note! By turning the knob, voltage and current limit values can be adjusted.

  • Page 21: Constant Voltage Operation

    Constant voltage operation In constant voltage operation, voltage values in limit mode and normal mode are the same, but current values are not To set the power supply in constant voltage operation, you must follow the steps described bellow: 1. Select the limit values for voltage and current parameters (U ), depending on the application 2.
  • Page 22 8. Enable the output of the power supply By pressing On / Off key, you enable the output. Power supply goes to normal mode operation and CV indicator will be displayed. In this case constant voltage operation is active. If CC indicator will be displayed, you must set a higher value for current limit. Important note! By turning the knob, voltage and current limit values can be adjusted.

  • Page 23: On / Off Key

    On / Off key On / Off key is used to enable / disable the output of the power supply from the front panel. By pressing On / Off key, you alternate these two states: output on / output off. When the output is off, power supply displays: Output off The indicators according to power supply’s state will also be displayed (e.g.:...

  • Page 24: Remote / Local Key

    Remote / Local key This key has a double function, depending on the state of the power supply (remote mode or local mode). Local Mode function While in local mode of operation, Remote / Local key has a double function, depending on the state of the power supply.
  • Page 25 Select parity By turning the knob, you will view available parities. When desired parity is displayed, press Remote / Local key. These settings are saved in non-volatile memory, so they don’t change when you turn of the power supply. If you didn’t change anything of the previous set parameters, the power supply will display No Change message.

  • Page 26: Errors / Calibrate Key

    Errors / Calibrate key This key has a double function: errors related in normal mode (see this section) and calibration related in calibration mode (see calibration section). There are 2 types of errors: user defined errors and errors defined by SCPI 1999 standard.
  • Page 27 After several seconds the power supply will go back to normal mode. The err indicator will not be displayed anymore. If there are no errors in the queue and you select Errors option in order to view the errors, the power supply will display: No Errors And then it will return to normal mode.
  • Page 28 Exit Exit option allows you to leave this menu, without changing anything. Exiting message will be displayed and the power supply returns to the previous state (the state before entering this menu). Important note! If you enter in the Errors / Calibrate menu and no action takes place for approx.

  • Page 29: Calibration Overview

    Calibration overview Calibration is a procedure that ensures that the power supply will work properly, with parameters specified within Technical Specification section. Before initiating the calibration procedure, the following conditions must be assured: § § disconnect any loads connected to the power supply and turn it on §...

  • Page 30: Unsecure Procedure For Calibration

    Unsecure procedure for calibration To unsecure the power supply, the next steps bust be followed: 1. Turn on the power supply in calibrating mode To enter calibrating mode, you must turn on the power supply while pressing Errors / Calibrate key. You release the key after the long beep. After that, the power supply will display: Calibrating Mode Secured...
  • Page 31 From this moment you can proceed with calibration (see Calibration procedure section) or you can go back to normal mode operation. From now on, the power supply remains unsecured until you set a new secure code. If the security code you entered is not correct, power supply will display: Security code: invalid for 1 second.
  • Page 32 change anything concerning the secure state of the power supply (secured or unsecured). After you changed the security code or unsecured the power supply, you can go back to normal mode by pressing Local key. (You can come back to calibrating mode only by turning off the power supply and starting it in calibrating mode).

  • Page 33: Hardware Unsecure Procedure For Calibration

    Hardware unsecure procedure for calibration This procedure may be used to unsecure the power supply if you forgot the security code. To unsecure the power supply without using the security code, follow the next steps: 1. Turn off the power supply. Disconnect the power cord and all loads connected to the power supply.
  • Page 34 The power supply remains unsecured until you enter a new security code. Important note! Even if you are in calibrating mode, you cannot set a security code as long as the J6 jumper is in hardware unsecuring position. 5. Set J6 jumper for normal unsecuring mode. Important note! If you turn on the power supply in either normal mode or calibrating mode and J6 jumper is in hardware unsecuring position, error 701 (Calibration security...

  • Page 35: Calibration Procedure

    Calibration procedure Before initiating the calibration procedure, the following conditions must be assured: § § disconnect any loads connected to the power supply and turn it on § § let the power supply turned on for 1 hour, with no loads connected before you start the calibration procedure §...

  • Page 36: Voltage Calibration Procedure

    Voltage Calibration Procedure After you unsecured the power supply and you pressed Calibrate key, you entered calibrate mode. Volt Zero Scale Calibration 1. Select Volt Zero Scale calibration procedure In order to start voltage calibration procedure, you must select Volt Zero Scale option.

  • Page 37: Volt Full Gain Calibration

    DAC value displayed by the power supply until the voltmeter indicates the correct voltage value, depending on the model of the power supply (see the table bellow). Power supply model Voltage value for Volt Full Gain calibration 9120 16.3840 V 9121 16.3840 V 9122 32.7680 V For this, you use >...

  • Page 38: Ovp Calibration

    OVP Calibration While performing this calibration procedure, the power supply must have no loads connected to the output terminals. 1. Select OVP calibration procedure In order to initiate OVP calibration procedure, you must select OVP option. The power supply will display: Calibrating Mode You select this option by pressing Calibrate key.

  • Page 39: Current Calibration Procedure

    Current Calibration Procedure Current calibration procedure must be permormed after Voltage calibration procedure. Current Zero Scale Calibration While performing this calibration procedure, the power supply must have no loads connected to the output terminals. 1. Select Curr Zero Scale calibration procedure In order to start current calibration procedure, you must select Curr Zero Scale option.
  • Page 40 (see the table bellow). Power supply model Current value for Curr Full Gain calibration 9120 2.62144 A 9121 2.62144 A 9122 1.31072 A...
  • Page 41 Curr Full Gain ADC Calibrating After ADC calibration, power supply will return to Calibrate menu. In this moment, the calibration procedure is finished. By presing Local key, the power supply will return to local mode. Important note! In order to be sure that the power supply will work properly in normal mode after you leave the calibration procedure, you must turn off the power supply.

  • Page 42: Ovp / Secure Key

    The programming range for OVP trip level depends on the model of the power supply (see the table bellow): Power supply OVP min value OVP max value model 9120 33 V 9121 22 V 9122 63 V The OVP trip level you set is programmed by pressing OVP / Secure key.
  • Page 43 OVP On OVP Clear OVP Off Options are selected by pressing OVP / Secure key when the desired option is displayed. OVP On OVP On option enables overvoltage protection circuit. OVP trip level is the level value you programmed on Level option (after you first pressed OVP / Secure key).
  • Page 44 OVP Clear OVP Clear option is used to clear to OVP condition (for more details about how you get back to normal mode after OVP level was tripped, see next section). After you select the desired option, a message will be displayed. If you didn’t change anything of the previous set parameters, the power supply will display No Change message.
  • Page 45 Programming overvoltage protection circuit in front panel mode If you want to program an OVP trip level and to enable the overvoltage protection circuit using front panel keys, follow the next steps: 1. Turn on the power supply When you turn on the power supply, the overvoltage protection circuit is enabled and OVP trip level is set to maximum available value for OVP parameter, depending on the model of the power supply (see table in the prevous section).
  • Page 46 ovp indicator will be displayed. If you didn’t change anything, the power supply will display No Change message.
  • Page 47 Clearing the overvoltage condition There are three ways of clearing the OVP condition: Ø By increasing OVP trip level and clearing the OVP condition Ø By decreasing the output voltage and clearing the OVP condition Ø By disabling OVP circuit and by clearing the OVP condition Attention! The latter solution disables the OVP circuit, but the first and the second don’t! In this section we will describe the steps you must follow to clear the OVP...

  • Page 48: Clearing Ovp Condition

    Clearing OVP condition Clearing the OVP condition by increasing OVP trip level 1. Enter the OVP menu By pressing OVP / Secure key, you enter the OVP menu. 2. Adjust OVP trip level When you enter OVP menu, OVP trip level is displayed. Here, you set OVP trip level to a level higher than the programmed voltage value (U 3.
  • Page 49 Clearing the OVP condition by decreasing the output voltage 1. Decrease the output voltage level bellow OVP trip level Press Limit key and enter limit mode. Limit values of voltage and current will be displayed. ovp and lmt indicators will also be displayed. Adjust for output voltage limit to a lower value than the OVP trip level.
  • Page 50 Clearing the OVP condition by disabling OVP circuit 1. Disable OVP circuit By pressing OVP / Secure key, you enter OVP menu. Here you disable OVP circuit by turning the knob and selecting OVP Off option. OVP Off It doesn’t matter if you change or not OVP trip level as long as you disable the OVP circuit.

  • Page 51: Rear Panel Description

    Rear panel description On the rear panel of the power supply there are: § § RS-232 interface connector § § AC inlet § § Power-line fuse-holder assembly § § Rear output terminals. The sensing terminals (+s and -s) are connected to the output terminals of the power supply by jumpers.

  • Page 52: Remote Interface

    Remote interface RS – 232 interface is used for remote communication. For this, you must connect your power supply to a computer terminal (see Technical Specification section, Interface Cable paragraph). For remote control of the power supply, SCPI (Standard Commands for Programmable Instruments) commands are used.
  • Page 53 SCPI Command Terminators A command string sent to the power supply must terminate with a new line character (ASCII decimal code of 10) or a a carriage return character (ASCII decimal code of 13) Important note! The power supply will go to remote mode of operation (it can accept commands over RS232 interface) if SYSTem:REMote command is sent.

  • Page 54: Scpi Commands

    SCPI commands DISPLAY Subsystem :DISPlay [:WINDow][:STATe ] {OFF|ON} [:WINDow][:STATe ]? [:WINDow]:T EXT[:Data] <quoted string> [:WINDow]:TEXT[:DATA]? [:WINDow]:TEXT:CLEar MEASure Subsystem :MEASure :CURRent[:DC]? [:VOLTage][:DC]? OUTPut Subsystem :OUTPut [:STATe] {OFF|ON} [:STATe]? SOURCE Subsystem [:SOURce] :CURRent[:LEVel][:IMMediate][:AMPLitude] {<current>|MIN|MAX|UP|DOWN} :CURRent[:LEVel][:IMMediate][:AMPLitude]? [MIN|MAX] :CURRent[:LEVel][:IMMediate]:STEP[:INCrement] {<numeric value>|DEFault} :CURRent[:LEVel][:IMMediate]:STEP[:INCrement]? [DEFault] :CURRent[:LEVel][:IMMediate]:TRIGgered[:A MPLitude] {<current>|MIN|MAX} :CURRent[:LEVel][:IMMediate]:TRIGgered[:AMPLitude]? [MIN|MAX] :VOLTage[:LEVel][:IMMediate][:AMPLitude] {<current>|MIN|MAX|UP|DOWN} :VOLTage[:LEVel][:IMMediate][:AMPLitude]? [MIN|MAX]...
  • Page 55 :VERSion? TRIGger Subsystem INITiate[:IMMediate] TRIGger[:SEQuence]:DELay {<seconds>|MIN|MAX} TRIGger[:SEQuence]:DELay? [MIN|MAX] TRIGger[:SEQuence]:SOURce {BUS|IMM} TRIGger[:SEQuence]:SOURce? *TRG Non-SCPI commands SET {<voltage>|DEF|MIN|MAX}[,<current>|DEF|MIN|MAX] SET? CALibration:MESSAGE <quoted string> CALibration:MESSAGE? SYSTem:REMote IEEE 488.2 commands *CLS *ESE <enable value> *ESE? *ESR? *IDN? *OPC *OPC? *RST *SAV {0 | 1 | 2 | … | 99} *RCL {0 | 1 | 2 | …...

  • Page 56: Scpi Commands Overview

    SCPI commands overview System – Related Commands DISPlay Subsystem This subsystem controls the presentation of textual information and measurement data. :DISPlay[:WINDow][:STATe] {0|1|OFF|ON} This command turns power supply’s display off and on. When the display is off, only annunciators are displayed. You can replace off|on parameters with 0|1 numeric values.

  • Page 57: Output Subsystem

    OUTPut Subsystem This subsystem controls the output of the power supply. :OUTPut[:STATe] {0|1|OFF|ON} This command enables and disables the output of the power supply. You can replace off | on parameters with 0 | 1 numeric values. When output is enabled, the power supply will display voltage and current value measured on the output terminals of the power supply.

  • Page 58: Source Subsystem

    Output Setting Commands SOURce Subsystem According to SCPI standard, SOURce node is optional, so the devices which are primarily sources accept shorter commands. This subsystem contains commands that program power supply parameters or commands that query programmed power supply parameters (for example: programmed values for current and voltage, programmed values for step current and step voltage, lowest or highest value possible to program for current and voltage )
  • Page 59 CURR:STEP 0.2 ;program current step value CURR UP ;increase output current CURR:STEP 0.5 ;program current step value CURR DOWN ;decrease output current Note: If no step value was programmed before CURR UP or CURR DOWN commands, default step value (0.001 A) will be used. CURRent[:LEVel][:IMMediate]:TRIGgered[:AMPLitude] {<current>|MIN|MAX} This command allows you to program the current trigger value, which is transfered to the output terminals when a trigger signal occurs.
  • Page 60 This command allows you to set the voltage step for VOLT UP or VOLT DOWN command. The minimum value for step is 10 mV. :VOLTage[:LEVel][:IMMediate]:STEP[:INCrement]? [DEFault] This command queries the programmed step value (if no parameter specified), or the default step value (if DEFault parameter is specified within the command) for voltage.
  • Page 61 :VOLTage:PROTection:STATe? This command queries the overvoltage protection circuit state. The returned parameter is always a numeric parameter: 0 (for OFF state) or 1 (for ON state). :VOLTage:PROTection:TRIPped? This command queries if the protection circuit is tripped or not. The returned parameter is always a numeric parameter:.
  • Page 62 Let’s say that the output voltage is lower than 5V. No load connected. VOLT:PROT 5 ;program OVP trip level VOLT:PROT:STAT ON ;enable OVP circuit If OVP circuit is already enabled, you don’t have to enable it again! VOLT 6 ;OVP circuit enabled When output voltage becomes equal or greater than OVP trip level (here is 5V), OVP circuit is enabled.
  • Page 63 VOLT? ;returns programmed output voltage (5.5V) Still output is disabled and Over Voltage message is displayed (because you didn’t clear OVP condition yet) VOLT:PROT:CLEAR ;clear OVP condition Power supply returns to previous state before enabling OVP circuit. It will display 5.5V and 0A. Since you didn’t disable OVP circuit, ovp annunciator will be displayed.

  • Page 64: Measure Subsystem

    Power supply returns to previous state before enabling OVP circuit. It will display 15V and 0A. Since you disabled OVP circuit, ovp annunciator will not be displayed anymore, untile you enable OVP circuit again. MEASure Subsystem This subsystem contains commands that allow you to measure the current and voltage to the output terminals of the power supply.

  • Page 65: Trigger Subsystem

    TRIGger Subsystem The power supply has a trigger subsystem, so voltage and current values can be changed when receiving a trigger signal. Depending on the trigger source selected, this change takes place immediately (when receiving the trigger signal), or after a time period equal with the delay you set (a time period from the moment the power supply receives the trigger signal) To activate the trigger subsystem you must follow the steps described bellow:...
  • Page 66 At power on reset or *RST command, voltage and current trigger values are the programmed values (values displayed in limit mode) until you explicitly program them with the desired values. So before programming voltage and current values, :VOLTage[:LEVel][:IMMediate]:TRIGgered[:AMPLitude]? :CURRent[:LEVel][:IMMediate]:TRIGgered[:AMPLitude]? commands return the programmed values for voltage and current. Trigger programmed values are available until a new programming command for a certain parameter, no matter how many times you use the trigger subsystem.
  • Page 67 before sending the trigger signal. Otherwise, Trigger ignored error (err -211) is generated. Here are described the commands used to set trigger subsystem’s parameters: :CURRent[:LEVel][:IMMediate]:TRIGgered[:AMPLitude] <current>|MIN|MAX} This command allows you to program the current trigger value, which is transfered to the output terminals when a trigger signal occurs. By programming this value, you don’t change the current programmed value.
  • Page 68 This is the time delay between the receive of the trigger signal and the corresponding action (trigger values become the output values). Instead of a numeric value, you can use “MINimum” or “MAXimum”, “Up” or “DOWN” parameters. MIN parameter allows you to set the trigger delay to 0 seconds. MAX parameter allows you to set the trigger delay to 36,000 seconds (equivalent to 10 hours).

  • Page 69: Non_Scpi Commands

    Non-SCPI commands SET {<voltage>|DEF|MIN|MAX}[,<current>|DEF|MIN|MAX] This is a non-SCPI command. This command allows you to program output voltage and current values in the same time, using one command only. Using this command, you can program output voltage or output voltage and current values.

  • Page 70: Ieee 488.2 Commands

    IEEE 488.2 commands The 488.2 specifications include some instrument commands and a status information scheme. For more information about SCPI Status Registers, see Status Reporting Overview section. *CLS (Clear Status) This command clears Status Byte Register and all the Event Registers summarized in Status Byte, such as Questionable Status Event Register and Standard Event Register.
  • Page 71 *OPC? The power supply returns an ASCII “1” after all operations, including this command are executed. *RST This command allows you to reset the power supply. The power supply reset can be achieved by sending this command or by selecting RESET option from the Recall menu (Recall key). The power supply reset values for different parameters are listed in Technical Specifications section.

  • Page 72: Scpi Status Registers

    The SCPI Status Registers Status reporting scheme is described in this section. Questionable Status Event Register Enable Register Output Buffer Voltage Current Not Used Not Used Not Used Not Used Not Used Not Used Overvolt Not Used Status Byte Not Used Summary Reg Enable Reg Not Used Not Us ed...
  • Page 73 Event Register is a read only register. Bits in an event register are set depending on the state of the power supply. An event register is cleared after its value was queried or by sending *CLS command. A *RST command does not clear event registers. When an event register is queried, the power supply returns a decimal value, which is the binary –...
  • Page 74 Standard Event Register Standard Event Register reports different instrument events, such as: query errors, device dependent error, execution errors, command errors, power on event. A set bit indicates that an event of the specified type occurred. Bit 0 - OPC (Operation Complete) - indicates that all previous commands have been executed and the device is ready to accpet new commands - this bit is set only after an *OPC command...
  • Page 75 Status Byte Register Status Byte Register reports conditions from the defined status registers, depending on the bits from the enable registers. So clearing an event register will clear the coresponding bits from the Status Byte Register. Bits 0..2 - Not used - always set to 0 Bit 3 - QUES...

  • Page 76: Error Messages

    Error Messages There are 2 kinds of errors that will be generated by the power supply: ♦ standard errors (errors defined by SCPI standard, in [-299,-100] interval) ♦ device specific errors (user defined errors, in [-399,-300] or [1,32767] interval) Following types of errors may occur: ♦...
  • Page 77 Error -123: Exponent too large The numeric parameter received has an exponent larger than 32,000. Error -124: Too many digits The decimal numeric parameter has a mantissa which contains more than 255 digits, excluding leading zeros Error - 128: Numeric data not allowed A legal numeric data element was received, but is not the right data element for the header Error -131: Invalid suffix...

  • Page 78: Execution Errors

    Execution Errors Error – 211: Trigger ignored *TRG command was received, but it was ingnored because trigger subsystem was not initiated (using INITiate command). Error - 222: Data out of range The numeric parameter value is out of range. Error - 223: Too much data A legal string program data element contains more data than the device could handle due to memory or due to device specific requirements.

  • Page 79: Self-Test Errors

    Self test errors Self test errors are user defined. They are generated after power up. Here are self test errors generated by the power supply: Error 601: Front panel does not respond Error 602: CV not high Error 603: CV not low Error 604: CC not high Error 605: CC not low Error 606: OVP not high...
  • Page 80 Error 630: Data in location 1 checksum failed If this error is generated, a new saving for the power_up state must be done. If the error persists, the power supply must be delivered to B&K Precision for service. Error 641: Filter register error Error 642: ADC not locked Error 643: ADC not ready Error 644: ADC out of range...

  • Page 81: Calibration Errors

    Calibration errors Here are calibration error messages generated by the power supply: Error 637: Secure code checksum failed If this error is generated, the power supply must be unsecured using hardware unsecure procedure. After that, the power supply must be secured. For more information, see Calibration Overview section.
  • Page 82 Error 731: DAC offset register OVP start value out of range Error 732: DAC offset register OVP out of range Error 733: DAC offset register OVP memory bad Error 734: DAC OVP step register start value out of range Error 735: DAC OVP step register out of range Error 736: DAC OVP step register memory bad Error 741: I register out of range...
  • Page 83 In this case, the power supply must be turned off and then turned on. If the messages persist, the power supply must be delivered to B&K Precision for service.

  • Page 84: Technical Specifications

    Technical specifications Table 1: Technical specifications for Model 9120 Parameter Model 9120 Output Ratings (at 0 ° - 40 ° C) 0 to + 30 V / 0 to 3 A < Programming Accuracy [1] Voltage 0.05%+10 mV 12 months ( at 25 ° C±5 ° C) ± (% of Current <...
  • Page 85 Table 2: Technical specifications for Model 9121 Parameter Model 9121 Output Ratings (at 0 ° - 40 ° C) 0 to + 20 V / 0 to 5 A Programming Accuracy [1] Voltage < 0.05%+10 mV 12 months ( at 25 ° C±5 ° C) ± (% of Current <...
  • Page 86 Table 3: Technical specifications for Model 9122 Parameter Model 9122 Output Ratings (at 0 ° - 40 ° C) 0 to + 60 V / 0 to 2.5 A Programming Accuracy [1] Voltage < 0.05%+10 mV 12 months ( at 25 ° C±5 ° C) ± (% of Current <...
  • Page 87 Accuracy specifications are after an 1-hour warm-up with no load and calibration at 25 ° C Transient Response Time Less than 50µsec for output to recover to within 15mV following a change in output from full load to half load or vice versa. Setting time Less than 90msec for the output voltage to change from 1% to 99% or vice versa following the receipt of VOLTAGE or SET command via RS-232...

  • Page 88: Supplemental Characteristics

    Supplemental Characteristics Remote sensing capability Voltage drop Up to 1V per each lead Load regulation Add 5mV to spec for each 1-volt change in the + outputs lead due to load current change. Load voltage Substract voltage drop in load leads from specified output voltage rating.
  • Page 89 The line voltage value is determined by value shown through the window of the fuse holder. Please ensure correct insertion and fuse rating. Fuse ratings: Model 9120: 3.15A/250V for 115Vac, 2A/250V for 230V Model 9121: 3.15A/250V for 115Vac, 2A/250V for 230V Model 9122: 5A/250V for 115Vac, 3.15A/250V for 230V All fuses are type T (temporized) for high power up currents.

  • Page 90: Programming Ranges

    The power supply parameters are programmed using command of SOURce subsystem. Here are programming ranges, programming values for MINimum, MAXimum, DEFault parameters and reset state: Table 4: Programming ranges for voltage parameter Voltage parameters Model 9120 Model 9121 Model 9122 Programming range 0 to 30.5 V 0 to 20.5 V...

  • Page 91: Reset Values

    Reset values Here are the power supply parameter values after a *RST command or after recalling Reset state. Table 7: Reset values for power supply parameters Power supply Model 9120 Model 9121 Model 9122 parameters Voltage Voltage step 0.01 V 0.01 V...

  • Page 92: Interface Cable

    Interface Cable In order to command the power supply over the remote interface, you must connect it to a computer terminal. Usually, the computer terminals are DTE (Data Terminal Equipment). The power supply is also DTE, so you need a DTE to DTE interface cable. These cables are called null-modem or crossover cables.
  • Page 93 Limited One -Year Warranty B&K Precision Corp. warrants to the original purchaser that its product and the component parts thereof, will be free from defects in workmanship and materials for a period of one year from the data of purchase. B&K Precision Corp.
  • Page 94 This warranty gives you specific rights and you may have other rights, which vary from state-to-state. Model Number: ______________ Date Purchased: __________ 22820 Savi Ranch Parkway Yorba Linda, CA 92887 714.921.9095 714.921.6422 Facsimile...

  • Page 95: Service Information

    Service Information Warranty Service: Please return the product in the original packaging with proof of purchase to the below address. Clearly state in writing the performance problem and return any leads, connectors and accessories that you are using with the device. Non-Warranty Service: Return the product in the original packaging to the below address.
  • Page 96 22820 Savi Ranch Parkway Yorba Linda, CA 92887 TEL: 714-921-9095 PN: 481-533-9-001 FAX: 714-921-6422 Printed in Romania ©2004 B&K Precision Corp. www.bkprecision.com...

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