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BHK-MG (OPR) 032816

3-59

3.7.2.2.2 CURRENT MODE OPERATION

When the series combination is operating in current mode (see Figure 3-22), the master is in
current mode and receives current programming commands while output voltage is determined
by the current through the load; the slave is in voltage mode and tracks the master output volt-
age.

FIGURE 3-22. SERIES MASTER-SLAVE (CURRENT MODE) CONFIGURATION

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Summary of Contents for BHK 1000-0.2MG

Page 1: ...w York 718 461 7000 requesting the correct revision for your par ticular model and serial number 3 The contents of this manual are protected by copyright Reproduction of any part can be made only with the specific written permission of Kepco Inc Data subject to change without notice KEPCO THE POWER SUPPLIER MODELS OPERATOR S MANUAL KEPCO INC 131 38 SANFORD AVENUE FLUSHING NY 11355 U S A TEL 718 46...

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Page 3: ...Transient_EFT ESD Surge Immunity Radiated Immunity designed to meet Conducted Immunity Magnetic Field Immunity designed to meet Manufacturer s Name Manufacturer s Address KEPCO INC 131 38 SANFORD AVENUE FLUSHING NY 11355 USA Importer s Name Importer s Address Type of Equipment Component Power Supply Model Series BHK MG 40W 1 2 Rack 200W Full Rack all models all options Model No Year of Manufacture...

Page 4: ... wire grounded mains connection See wiring section of this manual for complete electrical wiring instructions EN61010 1 2001 Cl 6 10 1 4 This power supply has secondary output circuits that are considered hazardous and which exceed 240 VA at a potential of 2V or more 5 The output wiring terminals of this power supply has not been evaluated for field wiring and therefore must be properly configured...

Page 5: ...re the product input for other nominal mains voltages as listed herein follow the applicable instructions shown in this manual NOTE Source power must be removed from the product prior to changing the set ting of the Voltage Range Selector switch The PROTECTIVE EARTHING CONDUCTOR TERMINAL must properly con nected prior to application of source power to the product see instructions on instal lation ...

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Page 7: ...fety 1 14 SECTION 2 INSTALLATION 2 1 Unpacking and Inspection 2 1 2 2 Terminations and Controls 2 1 2 3 Source Power Requirements 2 6 2 4 Cooling 2 6 2 5 Preliminary Operational Check 2 6 2 6 Installation 2 8 2 6 1 Bench Top Use 2 8 2 6 2 Rack Mounting 2 8 2 7 Wiring Instructions 2 8 2 7 1 Safety Grounding 2 8 2 7 2 Source Power Connections 2 9 2 7 3 D C Output Grounding 2 9 2 7 4 Power Supply Loa...

Page 8: ...2 Time Interval Accuracy 3 12 3 2 16 2 Running a Program 3 12 3 2 16 3 Stepping Through a Program 3 12 3 2 16 4 Cycling a Program 3 14 3 2 16 5 Running a Program Once 3 14 3 2 16 6 Stopping a Running Program 3 14 3 2 16 7 Sample Program 3 14 3 2 17 Calibration 3 15 3 3 Remote Mode Programming Using SCPI commands via IEEE 488 GPIB Bus 3 15 3 3 1 IEEE 488 GPIB Bus Protocol 3 15 3 3 2 DCL Control 3 1...

Page 9: ...dance Voltage source 3 38 3 6 3 1 Voltage Mode 3 42 3 6 3 2 Current Mode 3 43 3 6 4 Programming with external voltage using a high impedance low level 1V Voltage source 3 43 3 6 4 1 Voltage Mode 3 46 3 6 4 2 Current Mode 3 46 3 6 5 Programming with external current source 1 mA 3 47 3 6 5 1 Voltage Mode 3 49 3 6 5 2 Current Mode 3 49 3 7 Operating Modes 3 50 3 7 1 Slow Fast mode of operation 3 50 3...

Page 10: ...y A 4 A 15 TRG Trigger Command A 4 A 16 TST Self Test Query A 4 APPENDIX B SCPI COMMAND QUERY DEFINITIONS B 1 Introduction B 1 B 2 Numerical Values B 2 B 3 ABORt Command B 2 B 4 CAL Commands and Queries B 2 B 5 DISPlay CONTrast Command B 2 B 6 DISPlay CONTrast Query B 2 B 7 DISPlay MODE Command B 4 B 8 DISPlay MODE Query B 4 B 9 DISPlay TEXT Command B 4 B 10 DISPlay TEXT Query B 4 B 11 INITiate IM...

Page 11: ...2 B 53 SOURce VOLTage LIMit HIGH Query B 13 B 54 SOURce VOLTage MODE Command B 13 B 55 SOURce VOLTage MODE Query B 13 B 56 SOURce VOLTage PROTection LEVel Command B 13 B 57 SOURce VOLTage PROTection LEVel Query B 13 B 58 SOURce VOLTage LEVel TRIGgered AMPlitude Command B 13 B 59 SOURce VOLTage LEVel TRIGgered AMPlitude Query B 14 B 60 SOURce FUNCtion MODE Query B 14 B 61 STATus OPERation CONDition...

Page 12: ...8 B 84 SYSTem KLOCk Command B 19 B 85 SYSTem KLOCk Query B 19 B 86 SYSTem PASSword CENable Command B 19 B 87 SYSTem PASSword CDISable Command B 19 B 88 SYSTem PASSword NEW Command B 19 B 89 SYSTem PASSword STATe Query B 19 B 90 SYSTem SECurity IMMediate Command B 20 B 91 SYSTem VERSion Query B 20 B 92 TRIGger SOURce Command B 20 ...

Page 13: ...3 12 Analog Programming of Output Voltage Voltage Mode or Voltage Limit Current Mode using Grounded Low Impedance Voltage Source VS 3 39 3 13 Analog Programming of Output Current Current Mode or Current Limit Voltage Mode using Isolated Floating Low Impedance Voltage Source VS 3 40 3 14 Analog Programming of Output Current Current Mode or Current Limit Voltage Mode using Grounded Low Impedance Vol...

Page 14: ...LIST OF FIGURES FIGURE TITLE PAGE viii BHK 500 0 4MG SVC 032816 B 5 Programming Voltage B 14 B 6 Using Status Commands and Queries B 15 B 7 Using System Commands and Queries B 19 ...

Page 15: ... 4 Memory Location Worksheet 3 13 3 5 Sample Program Model BHK MG 500 0 4MG 3 15 3 6 IEEE 488 GPIB Bus Interface Functions 3 15 3 7 IEEE 488 GPIB Bus Command Mode Messages 3 16 3 8 IEEE 488 GPIB Bus Data Mode Messages 3 17 3 9 Rules Governing Shortform Keywords 3 26 3 10 Feedback Resistor and Current Sensing Resistor Values 3 36 4 1 VISA Resource String Corresponding to Interface 4 5 4 2 Calibrati...

Page 16: ...l and or analog inputs When OUTPUT is set to off from the key pad or the GPIB an analog input will still produce an output from the BHK MG which will be indicated on the LCD If the output is greater than 8 Volts and the current is higher than 2 LSB s a shutdown sequence begins the unit will beep the LCD will flash DIGITAL IS OFF and SET ANALOG OFF and the unit will shut down within 25 seconds unle...

Page 17: ...BHK MG032816 xi FIGURE 1 1 BHK MG SERIES PROGRAMMABLE POWER SUPPLY ...

Page 18: ...xii BHK MG032816 ...

Page 19: ...racteristic Four single output models are available each of which have two output current ranges as listed in Table1 1 Although designed as a stand alone bench top unit the full rack cross section permits mounting in a standard 19 inch wide rack see Table1 5 Connections can be made at both rear output terminals recommended for rack mounted configurations and front output terminals recom mended for...

Page 20: ...bsorbed by the unit from the load occurs when the output voltage is programmed to a lower value The sink current is constant from 45 to 55 of High Current scale rating it flows until the output reaches the lower voltage Type of Stabilizer Linear with automatic crossover Voltage Current Adjustment range Adjustment is either continu ous using analog program ming or stepped using digital programming ...

Page 21: ... between infinity and 400 IO max Current Fast Mode 50 IO max 100 sec Iout IO max and load switched between 0 1 x EO max IO max and EO max IO max Small signal 3 dB Bandwidth Fast Mode Voltage 2 5 KHz Load EO max IO max Vprog out 200V d c from keypad Vv analog in 0 2 V rms from analog input terminal Current 2 3 KHz Load EO max IO max Iprog out 200 x IO max EO max from keypad Vc analog in 0 2 V rms f...

Page 22: ... to Low Protection Overtemperature See PAR 1 4 10a Overvoltage Overcurrent 0 to 1 1 x EOmax 0 to 1 1 x IOmax except BHK 300 0 6MG 0 to 1 08 x IOmax BHK 300 0 6MG only See PAR 1 4 4 Uneven voltage current in pass element See PAR 1 4 10c Fan failure See PAR 1 4 10d AC line failure See PAR 1 4 10e Interruption between sens ing and power terminals See PAR 1 4 10f Overload of main or auxiliary power tr...

Page 23: ...IEC 3 wire type connector Interlock switch 1 pole Interlock switch monitors plastic cover over rear panel terminals d c output terminals Rear panel Terminal Block 11 posi tions Output Sense Ground Internal Capac itor Grounding Network Front panel Jacks 2 Output Control Local Digital control using front panel keypad 24 pads and LCD Remote Digital control using rear panel IEEE 488 Bus 24 pin female ...

Page 24: ...1 6 BHK MG OPR 032816 FIGURE 1 2 BHK SERIES POWER SUPPLY MECHANICAL OUTLINE DRAWING SHEET 1 OF 2 ...

Page 25: ...BHK MG OPR 032816 1 7 FIGURE 1 2 BHK SERIES POWER SUPPLY MECHANICAL OUTLINE DRAWING SHEET 2 OF 2 ...

Page 26: ... the uncommitted amplifiers in order to have control over the entire range of the output voltage current limit or output current voltage limit The analog programming port is not calibrated however the zero point is accurate to less than 0 1 The full scale tolerance is 2 maximum when using the preamplifier with external matched pair resistors Refer to PAR 3 6 for more information about remote progr...

Page 27: ...g on a dedicated line status port con nector The default values are 1 1 x EOmax for overvoltage protection and 1 1 x IOmax for overcurrent protection Refer to PAR 3 2 11 for more information 1 4 5 USER DEFINED VOLTAGE CURRENT LIMITS The BHK MG Power Supply can be programmed not to exceed user defined values that can be lower than the maximum values For example the BHK 500 0 4MG which has maximum o...

Page 28: ...PAR 3 2 10 for more information Measurement of a decreasing output current of the power supply that falls below 8 98 0 01 of the rated value is automatically measured with increased resolution accuracy by a factor of 10 until the current rises above 9 69 0 01 of rated value The factory setting is for the high current range shown on the top line of the LCD in command entry status by the message Ihi...

Page 29: ...ensing and corresponding power output terminals If there is an interruption between the sensing and power terminals two diodes connected in parallel between the sensing lead and the corresponding power lead one forward biased and one reverse biased allow the power supply to continue to function g Overload of the main or auxiliary power transformer If input current of the main trans former exceeds ...

Page 30: ...V the charge time which is more accurate can also be used in the formula where T discharge or charge time V change in voltage from fully charged to fully discharged or vice versa I discharging or charging current BHK MG charging current has a tolerance of 0 05 of nominal value discharge current has a tolerance of 10 of nominal value The value of the capacitor under test can be calculated directly ...

Page 31: ...loop Op Amp A2U4A through 1K resistance Signal GND 5 7 N A Recommended to be used as Return for signals at pins 6 and 8 Current Monitor not calibrated 6 0V 10mV for IO 0mA to 10V 0 12V for IO Full Scale Output of closed loop Op Amp A2U7 Voltage Monitor not calibrated 8 0V 10mV for EO 0V to 10V 0 25V for EO Full Scale Output of closed loop Op Amp A2U1 Recommended load equal to or greater than 10K o...

Page 32: ...K MG Power Supply to GPIB bus SNC 488 4 Slide 2 Allows rack mounted units to slide in and out CS 01 02 03 Kepco 110 QD 14 2 Jonathan External Trigger Port mating connector Allows access to external trigger function 142 0527 Kepco SP 2501 CUI RS 232 Port Adapter Cable Kit Contains RJ 45 Patch cord two RS 232 adapt ers one with male pins to connect to DTE equipment and one with female pins to connec...

Page 33: ...or shipping damage before attempting to operate Perform the preliminary operational check as outlined in PAR 2 5 If any indication of damage is found file an immediate claim with the responsible transport service 2 2 TERMINATIONS AND CONTROLS a Front Panel Refer to Figure 2 1 and Table 2 1 b Rear Panel Refer to Figure 2 2 and Table 2 1 FIGURE 2 1 BHK MG SERIES FRONT PANEL CONTROLS INDICATORS AND C...

Page 34: ... to restore unit to pre established setting or to shut down the output see Table 2 2 for pin assignments NOTE Mating connector is a 3 pin plug OUTPUT TERMINALS barrier strip TB1 Provides Power Supply output connection points See Table 2 6 for terminal assignments V PROG terminal strip TB2 Provides input output signals for analog programming of output voltage or voltage limit See Table 2 7 for term...

Page 35: ...436 PIN FUNCTION RS 232 PORT connector A1J5 1 RTN Return 1 Signal Ground 2 Not Used Not Used 2 Receive Data 3 TXD Transmit Data 3 Transmit Data 4 RXD Receive Data 4 Data Terminal Ready protocol not used 5 RTN Return 5 Signal Ground 6 Not Used Not Used 6 Data Set Ready protocol not used 7 RTN Return 7 Request To Send protocol not used 8 RTN Return 8 Clear To Send protocol not used 9 Signal Ground ...

Page 36: ...ure active high see PAR 1 4 10 requires pin 4 to be connected to the of the host computer d c supply as described in PAR 2 9 8 Not Used 9 Not Used TABLE 2 5 IEEE 488 PORT CONNECTOR PIN ASSIGNMENTS CONNECTOR PIN SIGNAL NAME FUNCTION IEEE 488 PORT A1J1 1 DI01 I O Line 2 DI02 I O Line 3 DI03 I O Line 4 DI04 I O Line 5 EOI End or Identify 6 DAV Data Valid 7 NRFD Not Ready for Data 8 NDAC Not Data Acce...

Page 37: ...tted amplifier 7 V FBK Internal feedback resistor the other end is connected to uncommitted amplifier output 8 V OUT Output of uncommitted amplifier 9 V EXT External analog programming voltage input 0 to 10V pro grams 0 to 100 of EOmax 10 SGND Signal common TABLE 2 8 CURRENT PROGRAMMING TERMINAL STRIP TB3 TERMINAL ASSIGNMENTS TERMINAL SIGNAL NAME FUNCTION 1 10V 10V d c reference voltage 2 C NINV N...

Page 38: ...PROPER AIR ENTRY AND EXHAUST Periodic cleaning of the power supply interior is recommended If the power supply is rack mounted or installed within a confined space care must be taken that the ambient temperature which is the temperature of the air immediately surrounding the power supply does not rise above the specified limits see Table 1 2 2 5 PRELIMINARY OPERATIONAL CHECK BEFORE APPLYING AC SOU...

Page 39: ...ut voltage and press ENTER Output voltage will be displayed at bottom left of LCD Verify the LCD reads CV constant voltage mode NOTE If tolerances specified in the following steps are exceeded refer to Section 4 and reca librate the unit 6 Compare the programmed output voltage value with the voltage reading of the DVM the difference between the two should not exceed 0 025 of the nominal voltage of...

Page 40: ...er if the application requires remote sensing it is necessary to use rear output terminals for sensing connections 2 6 2 RACK MOUNTING The unit can be mounted directly in a 19 inch wide rack after the bench type feet are removed Optional slides see Table 1 5 can be used Installation of slides can improve access to the unit see Figure 1 2 2 7 WIRING INSTRUCTIONS Interconnections between an a c powe...

Page 41: ...noise For single isolated loads the d c ground point is often best located directly at one of the output terminals of the power supply when remote error sens ing is employed d c ground may be established at the point of sense lead attachment In the specific case of an internally grounded load the d c ground point is automatically established at the load The output terminals located on both the fro...

Page 42: ...e insulation must be rated for the nominal voltage of the power sup ply plus the float voltage the DC Isolation Voltage see Table 1 2 under Output Characteristics defines the maximum float voltage allowed For noisy environments tied pair adjacent wires secured with cable ties or twisted pair cables are recommended It is recommended that cable length not exceed 50 feet for longer cable lengths cont...

Page 43: ...onnection between TB1 6 S and TB1 7 OUT C see Figure 2 5 Slow mode factory default configuration can be established by connecting TB1 6 to TB1 7 thus connecting the internal output capacitor to the output see Figure 2 4 2 7 5 3 GROUNDING NETWORK CONFIGURATION When the output is floating there is a tendency for large changes in output voltage to affect the digital programming section possibly resul...

Page 44: ...RMINAL GROUNDED To configure the BHK MG as a negative output power supply referenced to ground connect the positive output terminal to ground use a 5 terminal link to connect TB1 4 GND CHASSIS to TB1 2 OUT Note that when the positive output is grounded the ground network TB1 3 is inoperative see Figure 2 5 FIGURE 2 5 REMOTE SENSING FAST MODE SELECTED POSITIVE OUTPUT GROUNDED ...

Page 45: ...6 or active low see Figure 2 7 FIGURE 2 6 STATUS PORT OPTO COUPLER ACTIVE HIGH CONFIGURATION FIGURE 2 7 STATUS PORT OPTO COUPLER ACTIVE LOW CONFIGURATION TABLE 2 9 INTERNAL JUMPER CONFIGURATION LOCATION JUMPER DEFAULT STATUS FUNCTION A1 J6 Not Installed May be installed temporarily to force the unit to enter First Time Calibration during power up sequence This requires the operator to enter the mo...

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Page 47: ...wer supply is in command entry status the command functions are effective when the power supply is in data entry status the data functions are effective 3 2 1 1 COMMAND ENTRY STATUS Indicated by blinking colon on bottom line of LCD the power supply is waiting for a command to be entered Valid command entry is accompanied by a brief audible beep data will not be accepted accompanied by longer audib...

Page 48: ...ent programmed value of parameter replaced by data entered TABLE 3 2 KEY FUNCTIONS KEY POWER SUPPLY STATUS ACTIVE DESCRIPTION REFERENCE PARAGRAPH OUTPUT ON OFF Command Entry If top line of LCD reads Digital is OFF press to enable the output If output is on press to disable the output controlled by digital means keypad or GPIB setting If analog control used analog input must be turned off separatel...

Page 49: ...nt and overvoltage and overcurrent protection Data entry required to select memory location where val ues are to be stored 3 2 13 EDIT PROG Command Entry Press to select the starting memory location to be edited Then use or to view or modify the parameters of a specific memory location or to create a new program 3 2 16 1 STEP 4 Command Entry Press to select starting address of program to be execut...

Page 50: ... LCD shows the last successful operation and the unit beeps continually If the unit fails self test during power up error messages are shown on the LCD The failure will usually cause the test to be repeated and if the unit passes the second test power up contin ues and the error message disappears Refer to PAR 3 2 3 for details 2 Data Entry Press to enter number 2 3 2 1 2 3 Data Entry Press to ent...

Page 51: ... PROM FAILS CHECK Refer unit for service by authorized personnel RAM FAILS CHECK Refer unit for service by authorized personnel NvRAM Dpot Err Restore Factory Calibration as described in PAR 4 7 then verify that the programmed voltage output is accurate If problem continues refer unit for service by authorized personnel NVRAM STATUS ERROR Restore Factory Calibration as described in PAR 4 7 then ve...

Page 52: ...ne displays output voltage and current zero When the output is disabled volt age and current are programmed to zero the power supply remains in Command Entry status Pressing the OUTPUT ON OFF key again enables the output the previously programmed val ues of voltage and current are restored and the LCD displays the mode CV or CC and actual values of output voltage and current 3 2 7 2 DISABLING DC O...

Page 53: ...ll be on enabled or off disabled upon power up Press 1 to enable the Digital DC Output upon power up This sets the output to zero volt and current to the Power up and Reset current value Press 0 to disable the output upon power up Press CLEAR or RESET to exit menu and return to command entry status 3 2 8 RESET OPERATION RESET overrides all other local commands to reset the power supply to the powe...

Page 54: ...e to change the output by the minimum increment 0 025 of EOmax for voltage 0 025 of IOmax for current In CC mode these keys control output cur rent in CV mode they control output voltage When the unit switches from constant current CC to constant voltage CV mode or from CV to CC mode the and keys are reassigned to the active parameter Once the transition point is reached each press of the key incr...

Page 55: ...h maximum current otherwise it is automatically limited to the High maximum value programmed overcurrent protection value remains unchanged if it is less than or equal to 1 1 x High maximum current otherwise it is automatically limited to 1 1 x High max imum maximum current value PAR 3 2 12 is restored from saved value voltage and overvoltage protection settings are unchanged the 40 nonvolatile me...

Page 56: ...ng ing setting Press ENTER to validate displayed value or press number keys to enter new value and press ENTER to accept new setting the key erases data just entered or CLEAR to exit without changing setting NOTE Although the LCD can display up to five decimal places only two decimal places are actually used for voltage and current settings except that only one decimal place is used for setting vo...

Page 57: ...nd entry status The default value at power up for the Recall command is 01 During normal operation the location last used is displayed 3 2 15 FIRMWARE VERSION To display the firmware version of the power supply the power supply must be in command entry status _ _ Press the MENU key until the LCD displays BHK XXXX SSSSSS mm dd yyyy V zz where XXXX indicates the power supply model e g XXXX 1000 for ...

Page 58: ...ocation or enter the new loca tion and then press ENTER The display now shows TIMEval n n s where n n is the time value set for the selected location The default time interval for all 40 steps is 0 01 second Enter new value between 0 01 and 655 35 seconds and press ENTER to accept new value or press CLEAR to exit without changing value The unit returns to command entry status _ _ 3 2 16 1 2 TIME I...

Page 59: ...TION I SET Current mA V SET Voltage V OCset Overcurrent Protection mA OV set Overvoltage Protection V TIMEval 0 to 655 35 Sec NEXT STEP Next location to execute 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 ...

Page 60: ... 14 then loop back to the location 05 and repeat indefinitely 3 2 16 5 RUNNING A PROGRAM ONCE To set up a program to stop after running once modify the program see PAR 3 2 16 1 and go to the last memory location to be executed and set the NEXT STEP address to 0 For example with the power supply in command entry status _ _ press EDIT PROG Enter the last memory location you want executed e g 14 then...

Page 61: ... ANSI IEEE Std 488 IEEE Standard Digital Interface for Programmable Instrumentation communicating with a Host Computer Controller Talker Listener Tables 3 7 and 3 8 define the messages sent to the BHK MG or received by the BHK MG via the IEEE 488 bus in IEEE 488 command mode and IEEE 488 data mode respectively These messages are enabled during the handshake cycle with the BHK MG power supply opera...

Page 62: ...arallel Poll PP0 No Capability Device Clear DC1 Complete Capability BHK MG accepts DCL Device Clear and SDC Selected Device Clear Device Trigger DT1 Respond to TRG and GET trigger functions Controller C0 No Capability TABLE 3 7 IEEE 488 GPIB BUS COMMAND MODE MESSAGES MNEMONIC MESSAGE DESCRIPTION COMMENTS DCL Device Clear Received GET Group Execute Trigger Received GTL Go To Local Received IFC Inte...

Page 63: ...reset current value see PAR 3 2 8 1 3 3 3 CHANGING THE GPIB ADDRESS When the power supply is in command entry status _ _ press MENU key until the top line of the LCD indicates the current GPIB address Enter new value and press ENTER to accept new setting or CLEAR to exit without changing setting The GPIB address default value is set to 6 3 3 4 EXTERNAL TRIGGER The External Trigger Port can be used...

Page 64: ...al supplies can operate in either voltage mode with current limit or current mode with voltage limit The operating mode is determined by the voltage and current commands received as well as the load Each time voltage and current commands are received the unit must evaluate the commands and the load conditions to determine the proper operating mode Reducing the number of times this evaluation must ...

Page 65: ...ived by the computer so when it becomes set the unit is ready for its next command after reading back the data from the query that was added to the command string When sending the above commands via the RS 232 bus data flow control must be enabled XON using the SYST COMM SER PACE command see PAR B 77 must be enabled for the unit to properly update flash memory The OPC query is ideal to check if th...

Page 66: ...on Function Send_with_wait INPUT string to be sent to power supply Description adds the OPC query and performs serial polls to wait for the command to be completed int Send_with_wait char command char snd 501 data to be sent to the power supply char rcv 10 data from power supply int j sprintf snd s OPC command Add OPC to the command so there is a response from the power supply Send GPIbus adr snd ...

Page 67: ...rsed by the BHK MG Line Feed 0AH Causes the input buffer to be parsed by the BHK MG 3 4 3 RS 232 IMPLEMENTATION The following paragraphs are provided to help the user understand how the RS 232 serial inter face is implemented in the BHK MG Since the RS 232 protocol does not use a parity bit the echo mode is the default method used to ensure reliable communication between the command originator com...

Page 68: ...ack to the sender where it is verified as the same character that was just sent All non control characters are sent via the serial port of the command originator The control character BS is echoed as BS Space BS Only the first control character is returned in response to either a CR LF or LF CR character sequence see Figure 3 3 3 4 3 2 PROMPT METHOD The command originator sends a message line comm...

Page 69: ...ype not null modem or is defective If the LCD display reads PASSED the cable is correct remove the jumper and reconnect the cable to the computer If each of the above steps is completed successfully the problem lies in the computer hard ware and or software Refer to the Product Support area of the Kepco website for additional information regarding RS 232 communications problems www kepcopower com ...

Page 70: ...owing paragraphs introduce the subsystems subsystem commands are defined and explained in Appendix B 3 5 3 1 ABORT SUBSYSTEM This subsystem allows pending trigger levels to be cancelled 3 5 3 2 INITIATE SUBSYSTEM This subsystem enables the trigger system When a trigger is enabled the triggering action will occur upon receipt of a GPIB GET TRG or TRIGger command If a trigger circuit is not enabled ...

Page 71: ...mory The equipment required for calibration is specified in PAR 4 2 Because the voltage measured will be used as reference for calibration the DVM itself must be calibrated accurately During voltage calibration the voltage overvoltage and voltage readback are calibrated and during current calibration the current overcurrent and current readback are calibrated The normal procedure is to calibrate v...

Page 72: ...words Using an arbitrary short form such as ENABL for ENAB ENABLE or IMME for IMM IMMEDIATE will result in an error Regardless of which form chosen you must include all the letters required by that form To identify the short form and long form in this manual keywords are written in upper case let ters to represent the short form followed by lower case letters indicating the long form e g IMMediate...

Page 73: ...e separated from the last keyword by a space e g VOLT LEV TRIG 14 or SOUR VOLT MAX 3 5 4 6 MESSAGE UNIT SEPARATOR When two or more message units are combined in a program message they must be separated by a semicolon e g VOLT 15 MEAS VOLT and CURR 12 CURR TRIG 12 5 CURR LEV 3 5 OUTP ON CURR NL MESSAGE TERMINATOR KEYWORD QUERY INDICATOR ROOT SPECIFIER MESSAGE UNIT SEPARATOR DATA KEYWORD KEYWORD KEY...

Page 74: ... ALL KLOCk boolean KLOCk PASSword CENAble code CDISenable code NEW OLD NEW STATe SECUrity IMMediate VERSion LIST subsystem LIST CLE COUNt val COUNt COUNt SKIP val COUNt SKIP CURRent LEVel val LEVel POINt DWELl val DWELl DIR val DIR DWELl POINt QUERy val QUERy VOLTage LEVel val LEVel POINt SOURce subsystem SOURce CURRent LEVel IMMediate AMPLitude val AMPLitude MIN MAX TRIGgered AMPLitude val AMPLit...

Page 75: ...em command tree illustrated in Figure 3 5 The root is located at the top left corner of the diagram The parser goes to the root if a message terminator is recognized by the parser a root specifier is recognized by the parser Optional keywords are enclosed in brackets for identification optional keywords can be omit ted and the power supply will respond as if they were included in the message The r...

Page 76: ...the beginning is not mandatory e g the command meas volt curr will read output voltage and programmed current since the colon preceding curr indicates that curr is not part of the meas command and starts at the root UPPER case letters in mnemonics are mandatory short form Lower case letters may either be omitted or must be specified completely long form e g INSTrument long form has the same effect...

Page 77: ...can be configured to be summed with the output of the digital programming section at the input of the summing and cor rection amplifier Configuration of the uncommitted amplifiers is accomplished at the ANALOG PROGRAMMING TERMINALS at the rear panel VOLTAGE PROG terminal strip TB2 for volt age CURRENT PROG terminal strip TB3 for current Sample Program For KEPCO power supply using National Instrume...

Page 78: ...3 32 BHK MG OPR 032816 FIGURE 3 7 ANALOG VOLTAGE PROGRAMMING SIMPLIFIED DIAGRAM FIGURE 3 8 ANALOG CURRENT PROGRAMMING SIMPLIFIED DIAGRAM ...

Page 79: ... bus since the two programming methods are summed together For example for the BHK 500 0 4MG Power Supply if the output is programmed digitally to 200V and an analog signal which would produce a 100V output is applied to the uncommitted ampli fied the output would go to 300V assuming the value of the load and the programmed value of output current allow the power supply to remain in voltage mode N...

Page 80: ...er supply If the power supply outputs should stay isolated from ground any external equipment connected to the output terminal should be connected to a c source power using an iso lating transformer or should have floating inputs NOTE Any isolating transformer used for connecting test equipment to a c source power should have the isolation rated to a value higher than the maximum output volt age o...

Page 81: ...supplied to the load exceeds 1mA the unit will beep and enter a controlled shutdown for safety purposes unless the override jumper has been installed see Table 2 9 3 6 2 PROGRAMMING WITH EXTERNAL RESISTANCE Figures 3 9 and 3 10 are simplified diagrams of the BHK MG showing the jumper configuration and external connections required for analog programming using an external resistance Fig ures 3 9 sh...

Page 82: ...ier is applied via terminals 8 and 9 of TB2 or TB3 to a summing network at the input of the summing and correction amplifier For voltage programming the other input to the summing and correction amplifier DP V is from the voltage portion of the digital programming circuitry either from the keypad or the GPIB bus For current programming the other input to the sum ming and correction amplifier DP C ...

Page 83: ...y resistor s having a temperature coefficient of 20 parts per million or better and a wattage rating of 0 5W minimum R Internal feedback resistance equal to correction resistance K ohms determined by Model see Table 3 10 NOTE Output voltage is referenced to OUT and output current is negative leaving OUT ter minal This convention applies to voltage and current programming calculations of PAR 3 6 3 ...

Page 84: ...ource Figure 3 12 shows a grounded voltage source for programming of either output voltage when the unit is in voltage mode or voltage limit when the unit is in current mode Figures 3 13 isolated voltage source and 3 14 grounded voltage source are similar diagrams for programming either output current when the unit is in current mode or current limit when the unit is in voltage mode FIGURE 3 11 AN...

Page 85: ...BHK MG OPR 032816 3 39 FIGURE 3 12 ANALOG PROGRAMMING OF OUTPUT VOLTAGE VOLTAGE MODE OR VOLTAGE LIMIT CURRENT MODE USING GROUNDED LOW IMPEDANCE VOLTAGE SOURCE VS ...

Page 86: ...3 40 BHK MG OPR 032816 FIGURE 3 13 ANALOG PROGRAMMING OF OUTPUT CURRENT CURRENT MODE OR CURRENT LIMIT VOLTAGE MODE USING ISOLATED FLOATING LOW IMPEDANCE VOLTAGE SOURCE VS ...

Page 87: ... is applied to the inverting input of the uncommitted amplifier referenced to internal signal ground The voltage source impedance should be low compared to the 10K input impedance into the programming terminals of the power supply CAUTION Observe the following to avoid damage to the power supply For isolated voltage sources Figures 3 11 and 3 13 the external voltage source output must be isolated ...

Page 88: ...x 1 R 10K 1 0 1 x R x VEXT 0 1R x VEXT V d c where R Internal feedback resistance K ohms determined by Model see Table 3 10 VEXT External low impedance voltage source This source can be either a d c source deliver ing a positive output voltage or a function generator with an internal positive bias If the bias is not available from the function generator use the digital programming feature of the B...

Page 89: ...rrent programmed digitally from either local keypad or remote GPIB bus See above for definitions of Rs and VEXT 3 6 4 PROGRAMMING WITH EXTERNAL VOLTAGE USING A HIGH IMPEDANCE LOW LEVEL 1V VOLTAGE SOURCE Figures 3 15 and 3 16 are simplified diagrams of the BHK MG showing the jumper configuration and external connections required for analog programming using a high impedance low level 1V voltage sou...

Page 90: ...3 44 BHK MG OPR 032816 FIGURE 3 15 ANALOG PROGRAMMING OF OUTPUT VOLTAGE VOLTAGE MODE OR VOLTAGE LIMIT CURRENT MODE USING HIGH IMPEDANCE LOW LEVEL 1V VOLTAGE SOURCE VS ...

Page 91: ...OUTPUT CURRENT CURRENT MODE OR CURRENT LIMIT VOLTAGE MODE USING HIGH IMPEDANCE LOW LEVEL 1V VOLTAGE SOURCE VS The external voltage source is applied to the input of the uncommitted amplifier which is config ured as a noninverting amplifier having a gain of 10 ...

Page 92: ...nerator use the digital programming fea ture of the BHK MG to provide proper bias to avoid clipping the waveform at the output of the power supply ANALOG PROGRAMMING COMBINED WITH DIGITAL PROGRAMMING Eo R x VEXT EoutDP V d c where EoutDP Output voltage programmed digitally from either local keypad or remote GPIB bus See above for definitions of R and VEXT 3 6 4 2 CURRENT MODE With the power supply...

Page 93: ...her output voltage when the unit is in voltage mode or voltage limit when the unit is in current mode Figure 3 18 is a similar diagrams for programming either output current when the unit is in current mode or current limit when the unit is in voltage mode CAUTION Observe the following to avoid damage to the power supply The external current source output must be isolated from ground floating outp...

Page 94: ... applied to the inverting input of the uncommitted amplifier which is configured as a current voltage converter CAUTION Observe the following to avoid damage to the power supply The external current source output must be isolated from ground floating output or be powered from an a c source that is isolated from ground to avoid short circuiting the internal sensing resistor ...

Page 95: ...ias to avoid clipping waveform at the output of the power supply ANALOG PROGRAMMING COMBINED WITH DIGITAL PROGRAMMING Eo R x IEXT EoutDP V d c where EoutDP Output voltage programmed digitally from either local keypad or remote GPIB bus See above for definitions of R and VEXT 3 6 5 2 CURRENT MODE With the power supply in current mode see Figure 3 18 and the digitally programmed output voltage at ze...

Page 96: ...e disadvantage of slow mode is that programming time is increased Therefore slow mode is recommended for voltage mode applications where low noise and low amplitude recovery transients due to dynamic load changes are important In fast mode of operation the internal output capacitor is disconnected from the sensing termi nals by removing the link between TB1 terminal 7 OUT C and terminal 6 S This a...

Page 97: ...rity of the capacitors the plus terminal of each capacitor is connected to the minus terminal of the next capacitor if present or to OUT terminal of the power sup ply see Figure 3 19 b If precise control of the voltage across the external capacitor is desired use remote sensing connect the sensing leads and power leads across the external output capaci tor and connect the load to the external capa...

Page 98: ...ies to a good a c ground earth ground c If necessary the grounding network can be used for each one of the series connected power supplies within the limits of the maximum isolation voltage see Table 1 2 of the Model BHK MG Series refer to PAR 2 7 5 3 for additional information regarding use of the grounding network d The series combination of BHK MG power supplies can operate either isolated from...

Page 99: ...eypad Practical considerations suggest that the units operate in voltage mode current limit controlled from the local keypad The out put voltage and current of the series combination are given by the following equations Eo EoA EoB Io Eo RLOAD where Eo Io are output values of the series combination in Volts and milliamperes respectively EoA EoB are the individual output voltages for two series conn...

Page 100: ...t B as follows a Program IsetB to approximately 1 01 to 1 02 x IsetA step 3a This maximum current limit is never used except in the unlikely event that the current limit of Unit A is not work ing b Program VsetB to Eo VsetA VsetA is set in step 3b c Program overcurrent value of unit B IocsetB to 1 1 x IsetB step 4a d Program overvoltage value of unit B VovsetB to 1 1 x VsetB step 4b 5 To apply pow...

Page 101: ...BHK MG OPR 032816 3 55 FIGURE 3 20 SERIES AUTOMATIC CONFIGURATION ...

Page 102: ...omaxS REXT eq1 where EoM EoS are the output voltages of the master and slave unit respectively in Volts EomaxS is the maximum output voltage of the slave unit in Volts REXT is the external programming resistor of the slave unit in K ohms When REXT K ohms EomaxM Volts then Eo EoM EoM x EomaxS EomaxM with the maximum value of Eomax EomaxM EomaxS When REXT K ohms EomaxS Volts then Eo 2 x EoM having t...

Page 103: ... load switch is not used Set POWER switch of both units to up position to turn power on then press OUTPUT ON OFF key once on each unit to disable the output 3 Program slave unit as follows a Program IsetS to approximately 1 01 to 1 02 x current limit for power assembly This maximum current limit is never used except in the unlikely event that the current limit of master unit is not working b Progr...

Page 104: ...to the load c If load switch used open the switch d If load switch not used press POWER ON OFF key once on the master unit then once on the slave unit e Alternative Turn both units off by setting POWER switch to off down position first on master unit then on slave unit FIGURE 3 21 SERIES MASTER SLAVE VOLTAGE MODE CONFIGURATION ...

Page 105: ... in current mode see Figure 3 22 the master is in current mode and receives current programming commands while output voltage is determined by the current through the load the slave is in voltage mode and tracks the master output volt age FIGURE 3 22 SERIES MASTER SLAVE CURRENT MODE CONFIGURATION ...

Page 106: ...ply and the load 2 Apply power to the units a If a load switch is used close the switch Set POWER switch of both units to up position to turn power on b If load switch is not used Set POWER switch of both units to up position to turn power on then press OUTPUT ON OFF key once on each unit to disable the output 3 Program slave unit as follows a Program IsetS to approximately 1 01 to 1 02 x nominal ...

Page 107: ...IS DANGEROUS AND POTENTIALLY LETHAL OBSERVE ALL PRECAUTIONS LISTED IN PAR 3 6 1 AS WELL AS THE PRECAUTIONS LISTED BELOW a Connect the chassis ground terminal TB1 4 of all parallel connected power supplies to a good a c ground earth ground b If necessary the grounding network can be used for each one of the parallel connected power supplies refer to PAR 2 7 5 3 for additional information regarding ...

Page 108: ... will go from voltage mode to current mode and the other unit will begin to operate in voltage mode controlling the output volt age and delivering the difference in current between what the load demands and the current limit of the first unit This is especially true when the power supplies are working with remote sensing and there is a minimum difference one least significant bit 1 LSB between the...

Page 109: ...BHK MG OPR 032816 3 63 FIGURE 3 23 PARALLEL AUTOMATIC CONFIGURATION ...

Page 110: ... the load a If load switch used open the switch b If load switch not used press POWER ON OFF key once first on unit B then on unit A c Alternative Turn both units off by setting POWER switch to off down position first on unit B then on unit A 3 7 3 2 MASTER SLAVE PARALLEL OPERATION This configuration is characterized by the fact that only the master power supply is programmed controlled while the ...

Page 111: ...parallel combination is configured to operate in voltage mode see Figure 3 24 the master operates in voltage mode receiving voltage programming commands and the slave tracks the output current of the master FIGURE 3 24 PARALLEL MASTER SLAVE VOLTAGE MODE CONFIGURATION ...

Page 112: ...switch of both units to up position to turn power on b If load switch is not used Set POWER switch of both units to up position to turn power on then press OUTPUT ON OFF key once on each unit to disable the output 3 Program slave unit as follows a Program output current of slave unit IsetS to 0 b Program VsetS to the rated maximum voltage of the slave unit e g for BHK1000 0 2MG set VsetS 1000 c Pr...

Page 113: ... using the uncommitted amplifier of the master unit configured as a non inverting repeater between the signal coming from the master sensing resistor signal termi nal 2 and the input to R1 shown in Figure 3 25 2 The current of the slave unit will be slightly larger than the current of the master unit minimum of 5 for BHK 500 0 4MG due to the voltage drop on the wire connect ing the internal sensin...

Page 114: ...3 68 BHK MG OPR 032816 FIGURE 3 25 PARALLEL MASTER SLAVE CURRENT MODE CONFIGURATION ...

Page 115: ...setM to 1 2 the desired output current Io of the power assembly b Program VsetM to the voltage limit ELIM desired for power assembly c Program overcurrent value of master unit IocsetM to 1 1 x IsetM step 4a d Program overvoltage value of master unit VovsetM to 1 1 x VsetM step 4b 5 To apply power to the load a If load switch used open the switch b If load switch not used press POWER ON OFF key onc...

Page 116: ......

Page 117: ...um stress and a temperature coefficient equal to or better than 20 ppm per degree C During the calibration procedure the LCD displays the minimum requirements for the shunt resistor However to avoid problems due to drift caused by heat dissipation Kepco recommends the following BHK 300 0 6MG 1 67 Ohm 0 01 50W BHK 500 0 4MG 2 5 Ohm 0 01 25W BHK 1000 0 2MG 5 Ohm 0 01 10W BHK 2000 0 1MG 10 Ohm 0 01 5...

Page 118: ...ow current calibration Press RESET or CLEAR to exit calibration without saving values 5 LCD reads LOW CURRENT CAL Enter 1 for low current calibration see PAR 4 3 2 enter 0 to proceed to next step Press RESET or CLEAR to exit calibration without saving values 6 Disconnect the external shunt when instructed by the message displayed on the LCD 7 Press ENTER to save calibration values 4 3 1 VOLTAGE CA...

Page 119: ...0 1A 100mA Rs Ohms is the actual value of the external shunt resistor the same shunt resistor can be used for both Low and High scale current calibration NOTE The message Can t Adj Full Scale is displayed if either the shunt resistor is not connected to the output terminals during current calibration or if the shunt resistance is too high If this occurs it is necessary to press ENTER followed by R...

Page 120: ...2 10 0 02A 20mA BHK 2000 0 1MG 0 1 10 0 01A 10mA Rs Ohms is the actual value of the external shunt resistor the same shunt resistor can be used for both Low and High scale current calibration NOTE The message Can t Adj Full Scale is displayed if either the shunt resistor is not connected to the output terminals during current calibration or if the shunt resistance is too high If this occurs it is ...

Page 121: ...edure uses a calibration panel which is part of the IVI driver for the BHK MG 200W which can be downloaded from the Kepco website at www kepcopower com drivers htm Unzip the files and double click on setup exe to install the driver in Program Files KepcodcPower bhk 2 After the program is installed double click on Program Files KepcodcPower bhk KepcoControlPanel exe to run the program Two windows a...

Page 122: ...ge and current set to 0 click the RESET button 4 Range High and Range Low radio buttons allow range selection full rack units only 4 4 3 CALIBRATION CONTROLS NOTE Before performing calibration set BHK for local sensing connect S to OUT terminal and connect S to OUT terminal at the rear panel After turning the unit on it is necessary to wait 15 minutes before calibrating the unit to allow for therm...

Page 123: ...d window appears see Figure 4 4 The password has been set at the factory see Table 4 3 Type the proper password in the text box and click OK If the password has been forgotten consult factory If the password is correct calibration can be accomplished by following the screen prompts TABLE 4 2 CALIBRATION PANEL FUNCTIONS BUTTON OR WINDOW Function button Coarse Adjustment Decreases the output value b...

Page 124: ... text window reads Vout F S Using the coarse and and fine and buttons see PAR 4 4 3 adjust the output voltage until the DVM is as close as possible but above the rated nominal voltage then click OK button 7 The text window reads Cal Current High Range no skip Click YES button to per form high range current calibration 8 The text window reads Connect shunt across output Connect precision shunt resi...

Page 125: ...ovided and click OK NOTE The range of useful values for calibrating current magnification has a tolerance of 10 For example if the measured value entered for the BHK 1000 0 2MG is between 22 and 18 mA current magnification will be calibrated If the value is outside this range the unit uses the default value of 20 mA and current magnification is not cal ibrated Note that this calibration only impro...

Page 126: ...8 mA current magnification will be calibrated If the value is outside this range the unit uses the default value of 2 0 mA and current magnification is not cal ibrated Note that this calibration only improves the accuracy of the output current readback value and does not affect the setting value 19 The text window reads CAL Done Disconnect Shunt Click OK Current calibration is complete and automat...

Page 127: ...mand The syntax is as follows CAL DUMP source CAL COPY destination where source and destination refer to the areas of Flash memory where calibration data is stored designated as WORKing PRIor OLDest FACTory MASTer FIRst Source refers to the calibration area that is to be copied destination to the area that the calibration will be copied into The ability to save to the FACTORY area is prohibited If...

Page 128: ...s No Change No Change No Change 3 CAL SAVE Cal 3 values Cal 2 values Cal 1 values No Change No Change No Change 4 CAL SAVE Cal 4 values Cal 3 values Cal 2 values No Change No Change No Change 5 CAL DUMP FACTory CAL COPY WORKing Factory cal Cal 4 values Cal 3 values No Change No Change No Change 6 CAL DUMP PRIor CAL COPY WORKing Cal 4 values Factory cal Cal 4 values No Change No Change No Change ...

Page 129: ...er Enables the Standard events to be summarized in the Status Byte register 1 set enable function 0 reset disable function All of the enabled events of the standard Event Status Enable register are logically ORed to cause ESB bit 5 of the Sta tus Byte Register to be set 1 set enable 0 reset disable See example Figure A 1 A 4 ESE STANDARD EVENT STATUS ENABLE QUERY ESE Syntax ESE Return value Intege...

Page 130: ...ve been executed and changes in output level have been completed This com mand does not prevent processing of subsequent commands but bit 0 will not be set until all pending operations are completed 1 set enable function 0 reset disable function See example Fig ure A 1 As an example the controller sends command s then sends OPC If controller then sends ESR the power supply responds with either a 0...

Page 131: ...t command error Bit 5 ESR Returns 32 bit 5 set indicating Command Error has occurred since the last time the register was read IDN Power supply returns BHK 500 0 4 04 20 2004 E123456 V7 0 LIST IND 21 Selects memory location 21 LIST CURR 2 35E 1 Sets output current value of memory location 21 to 0 235A LIST VOLT 400 Sets output voltage value of memory location 21 to 400V OPC Allows status bit 0 to ...

Page 132: ...earing it 1 set function enabled 0 reset function disabled The register is cleared only when subsequent action clears all set bits MSS is set when the power supply has one or more reasons for requesting service A serial poll also reads the Status Byte Register except that bit 6 RQS not MSS and RQS will be reset Related Commands SRE SRE See example Figure A 1 A 15 TRG TRIGGER COMMAND TRG Syntax TRG...

Page 133: ... STAT B 14 B 15 STAT OPER EVENT B 64 SOUR LIST CLE B 16 STAT PRES B 65 SOUR LIST COUN B 17 B 18 STAT QUES EVENT B 66 SOUR LIST COUN SKIP B 19 B 20 STAT QUES COND B 67 SOUR LIST CURR B 21 B 22 STAT QUES ENAB B 68 B 69 SOUR LIST CURR POIN B 23 SYST BEEP B 70 SOUR LIST DIR B 24 B 25 SYST COMM GPIB ADDR B 71 B 72 SOUR LIST DWEL B 26 B 27 SYST COMM SER BAUD B 73 B 74 SOUR LIST DWEL POIN B 28 SYST COMM ...

Page 134: ... COMMANDS AND QUERIES CAL CAL commands and queries are used to perform calibration of the unit via the control interface These commands must be issued in a specific sequence in order to properly calibrate the unit To use these commands refer to Kepco s website www kepcopower com drivers and download the LabWindows CVI Version 5 driver for BHK MG This file provides remote calibration capability and...

Page 135: ... current value established by CURR TRIG VOLT TRIG Returns 215 voltage value established by VOLT TRIG ABOR Pending trigger levels changed to 221V 50mA immediate values VOLT 277 CURR 2 5E 2 Power supply output programmed to go to 277V 25mA TRG Power supply output returns to 221V current limit 50mA INIT CONT 0 Triggers disabled INIT CONT Power supply returns 0 OUTP OFF Output disabled OUTP Returns 0 ...

Page 136: ... MODE DISP MODE RST See example Figure B 2 B 10 DISPlay TEXT QUERY DISP TEXT Syntax Short Form DISP TEXT Long Form DISPlay TEXT Return Value Character string displayed on second line of LCD display Description Returns the text displayed on second line of LCD in TEXT mode When the display set to TEXT mode returns the character string within quotation marks entered by DISP TEXT If the display set to...

Page 137: ...value 0 to 65535 Description Allows beginning steps of list generated waveform to be run once then ignored When a list is to be repeated using LIST COUNT this command allows the user to skip the first nn steps once the full set has been executed After the first iteration which executes all steps the first nn steps are skipped The LIST COUN SKIP command allows the user to precondition a list genera...

Page 138: ...irection 1 up or 0 down for executing the list established by LIST DIR Related Commands LIST DIR See example Figure B 3 B 26 SOURce LIST DWELl COMMAND LIST DWEL Syntax Short Form LIST DWEL value 0 010 to 655 35 value value to maximum of 250 values Long Form LIST DWELl value 0 010 to 655 35 value value to maximum of 250 values Description Determines how long the main channel parameters will be acti...

Page 139: ...aximum number of entries is 250 Since the input buffer of the BHK has a limit of 253 characters multiple commands are necessary to complete the full 250 entries of the list If LIST VOLT is entered for only location 0 that voltage will apply to all steps when CURR MODE LIST is executed Related Commands LIST VOLT POIN LIST CLE RST See example Figure B 3 B 32 SOURce LIST VOLTage QUERY LIST VOLT Synta...

Page 140: ...ill be executed 100 times 44 steps in the list will be executed 100 times LIST COUN SKIP 4 Specifies that the first 4 steps of the sequence will only be executed the first time through the list For the subsequent 99 iterations established by LIST COUNT 100 location 0 0V will last 10 milliseconds CURR 001 VOLT 20 initializes the BHK output OUTPUT ON Turns the output on BHK now provides 0 volts LIST...

Page 141: ...d Commands OUTP See example Fig ure B 1 B 37 OUTPut STATe QUERY OUTP Syntax Short Form OUTP STAT Long Form OUTPut STATe Return Value int_value 0 or 1 Description Indicates whether power supply output is enabled or disabled Returns 0 if output disabled returns 1 if output enabled Related Commands OUTP See example Figure B 1 LIST QUERY 0 Sets query pointer to zero LIST DWEL POIN Returns 1 indicating...

Page 142: ...current If the value exceeds the current protection value set by CURR PROT see PAR B 44 error message 222 Data out of range is posted in the output queue NOTE If the current limit is changed any previously established trigger levels higher than the new limit must be reprogrammed to be lower than the new limit otherwise triggers will cause the output to exceed the new limit Once the limit is establ...

Page 143: ...ction value see Table 1 2 This value is determined at the factory and cannot be changed by the user CURR PROT MIN returns the minimum current protection value always 0 See example Figure B 4 Description Returns the current value established by CURR TRIG command See example Figure B 1 B 46 SOURce CURRent RANGe COMMAND CURR RANG Syntax Short Form SOUR CURR RANG LOW or SOUR CURR RANG UPP Long Form SO...

Page 144: ...odel e g 500V for BHK 500 80MG VOLT MIN returns minimum voltage allowed for power supply always 0 Related Commands VOLT See example Figure B 5 B 52 SOURce VOLTage LIMit HIGH COMMAND VOLT LIM HIGH Syntax Short Form SOUR VOLT LIM HIGH exp_value Long Form SOURce VOLTage LIMit HIGH exp_value exp_value digits with decimal point and Exponent e g 2 71E 1 for 27 1 Description Sets voltage limit for power ...

Page 145: ...ST commands See example Figure B 3 B 56 SOURce VOLTage PROTection LEVel COMMAND VOLT PROT Syntax Short Form SOUR VOLT PROT LEV exp_value Long Form SOURce VOLTage PROTection LEVel exp_value exp_value digits with decimal point and Exponent e g 2 71E 1 for 27 1 Description Sets overvoltage protection level for power supply If the value is out of the acceptable overvolt age range for the power supply ...

Page 146: ...gure B 6 NOTES 1 The power supply is assumed to be operating in constant voltage CV mode 2 Examples below are intended only to illustrate command functions Refer to PAR 3 3 6 for programming techniques to optimize performance OUTP ON Output enabled VOLT 218 CURR 1 1E 1 Power supply programmed to 218V 0 11A VOLT 2 157E2 Power supply programmed to go to 215 7V VOLT Returns 2 157E2 indicating program...

Page 147: ... Operation Event register is a read only register which holds latches all events that occur Reading the Operation Event register clears it See example Figure B 6 NOTE The power supply is assumed to be operating in CV constant voltage mode OUTP ON Output enabled VOLT 3 CURR 1E 2 Power supply programmed to 3V 0 01A STAT OPER ENAB 1056 Mask enabled for CC WTG and bits STAT OPER ENAB Returns 1056 32 1...

Page 148: ... 6 B 68 STATus QUEStionable ENABle COMMAND STAT QUES ENAB Syntax Short Form STAT QUES ENAB int_value Long Form STATus QUESionable ENABle int_value Function Programs Questionable Condition Enable Register Description Programs Questionable Condition Enable Register see Table B 3 The Questionable Condition Enable Register determines which conditions are allowed to set the Questionable Condition Regis...

Page 149: ...M SER BAUD Syntax Short Form SYST COMM SER BAUD Long Form SYSTem COMMunication SERial BAUD Return Value int_value 19200 9600 4800 2400 Description Returns operating baud rate B 75 SYSTem COMMunication SERial ECHO COMMAND SYST COMM SER ECHO Syntax Short Form SYST COMM SER ECHO ON OFF or 01 00 Long Form SYSTem COMMunication SERial ECHO ON OFF or 01 00 Description Enables ON or disables OFF echo mode...

Page 150: ...ong Form SYSTem ERRor Return Value int_value string Description Posts error messages to the output queue Returns the next error number followed by its corre sponding error message string from the instrument error queue The error queue is a FIFO first in first out buffer that stores errors as they occur As it is read each error is removed from the queue and the next error message is made available ...

Page 151: ...T KLOCK See example Figure B 7 FIGURE B 7 USING SYSTEM COMMANDS AND QUERIES B 86 SYSTem PASSword CENable COMMAND SYST PASS CEN Syntax Short Form SYST PASS CEN val Long Form SYSTem PASSword CENable val Description Sets the password enable state if the value matches the current password This command allows other commands such as all the calibration commands to operate B 87 SYSTem PASSword CDISable C...

Page 152: ...s mode is disabled and unit will wait for INIT IMM TABLE B 4 ERROR MESSAGES ERROR MESSAGE ESR ERROR BIT SET SEE PAR A 5 EXPLANATION 0 No error None No error 100 Command error Command Error bit 5 Command and data understood but more information included which is not recognized 102 Syntax error Command Error bit 5 First 4 characters recognized subsequent characters not recognized 103 Invalid separat...

Page 153: ...nd 301 Value bigger than limit Device Error bit 3 1 Requesting a time of 656 which is bigger than limit 311 Memory error Device Error bit 3 1 Power up NV RAM error 314 Save recall memory error Device Error bit 3 1 Using cell other than 1 41 for SAV and RCL 341 Non Volatile Mem CRC error Device Error bit 3 1 Power supply constants may be corrupted recalibration may be necessary 350 Queue overflow D...

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