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HP 6631B User's Manual

1. Pressing the Shift Error keys will show the error number Selftest error messages appear as ERROR lt n gt where n is a number listed in the following table If this occurs turn the power off and then back on to see if the error persists If the error message persists the dc source requires service Table 4 2 Power On Selftest Errors Failed Test Error 0 No error Error 1 Non volatile RAM RDO section checksum failed Error 2 Non volatile RAM CONFIG section checksum failed Error 3 Non volatile RAM CAL section checksum failed Error 4 Non volatile RAM STATE section checksum failed Error 5 Non volatile RST section checksum failed Error 10 RAM selftest Error 11 to 14 VDAC IDAC selftest 1 to 4 Error 15 OVDAC selftest Error 80 Digital I O selftest error Runtime Error Messages Appendix C lists other error messages that may appear at runtime If the front panel display shows OVLD this indicates that the output voltage or current is beyond the range of the meter readback circuit If the front panel display indicates an HP IB measurement is in progress Line Fuse If the dc source appears dead with a blank display and the fan not running check your power source to be certain line voltage is being supplied to the dc source If the power source is normal the dc source fuse may be defective 1 Turn off the front panel power switch and unplug the power cord 2 Remove the fuse from the rear panel 3 I
2. Low Current measurement High Current measurement Current Sink Measurement Low Current Sink measurement High Current Sink measurement Table B 6 Verification Test Record for HP 6634B Model HP 6634B Report No Date Test Description Maximum Specification Specification Voltage Programming and Measurement Low Voltage Vou som v omy Front Panel measurement a High Voltage Vou Front Panel measurement Current Programming and Measurement High Range Low Current La osma A High Current Iau ossa A Front Panel measurement Current Measurement Low Range Low Current measurement High Current measurement mA Tour 2 25 mA Current Sink Measurement Low Current Sink measurement See a ae oe uA Link 22 5 UA High Current Sink measurement Iink 2 85 MA ae ee Link 2 85 mA 58 Verification and Calibration B Performing the Calibration Procedure NOTE The calibration procedure can only be performed using the SCPI language commands Use either the front panel Address key to access the LANG command or use the SYSTem LANGuage command to change the programming language to SCPI Table B 1 lists the equipment required for calibration Figure B 1 shows the test setup You do not have to do a complete calibration each time If appropriate you may calibrate only the voltage or current and proceed to Saving the Calibration Constants However the voltage or current calibration sequence must be performed in its entirety T
3. D 71034 Boeblingen FAX 49 703 1 14 3143 Acoustic Noise Information Herstellerbescheinigung Diese Information steht im Zusammenhang mit den Anforderungen der Maschinenlaminformationsverordnung vom 18 Januar 1991 Schalldruckpegel Lp lt 70 dB A Am Arbeitsplatz Normaler Betrieb Nach EN 27779 Typpriifung Manufacturer s Declaration This statement is provided to comply with the requirements of the German Sound Emission Directive from 18 January 1991 Sound Pressure Lp lt 70 dB A At Operator Position Normal Operation According to EN 27779 Type Test Printing History The edition and current revision of this manual are indicated below Reprints of this manual containing minor corrections and updates may have the same printing date Revised editions are identified by a new printing date A revised edition incorporates all new or corrected material since the previous printing date Changes to the manual occurring between revisions are covered by change sheets shipped with the manual In some cases the manual change applies only to specific instruments Instructions provided on the change sheet will indicate if a particular change applies only to certain instruments This document contains proprietary information protected by copyright All rights are reserved No part of this document may be photocopied reproduced or translated into another language without the prior consent of Hewlett Packard Compa
4. Scrolling Keys Metering Keys Output Control Keys Entry Keys Examples of Front Panel Programming 1 Setting the Output Voltage and Current 2 Querying and Clearing Output Protection 3 Making Front Panel Measurements 4 Programming the Digital Output Port 5 Programming the Output Relay option 760 only 6 Setting the HP IB Address and RS 232 Parameters 7 Saving and Recalling Operating States SPECIFICATIONS Specifications Supplemental Characteristics VERIFICATION AND CALIBRATION Introduction Equipment Required Test Setup Performing the Verification Tests Turn On Checkout Voltage Programming and Measurement Accuracy Current Programming and Measurement Accuracy Performing the Calibration Procedure Front Panel Calibration Menu Front Panel Calibration Calibration Error Messages Changing the Calibration Password Calibration Over the HP IB ERROR MESSAGES LINE VOLTAGE CONVERSION Open the Unit Configure the Power Transformer Install the Correct Line Fuse Close the Unit INDEX Quick Reference HP 66332A Dynamic Measurement DC Source and HP 6631B 6632B 6633B 6634B System DC Power Supplies The HP 66332A is a 100 Watt high performance dc power supply that provides dynamic measurement and analysis of voltage and current waveforms It is designed to simplify the testing of digital cellular and mobile phones For example data acquired using its dynamic measurement capability can be used in determining the battery ope
5. cases it may also cause oscillations The wiring guidelines previously discussed under Wire Considerations will eliminate most stability problems associated with load lead inductance If additional measures are required keep the load capacitance as small as possible use larger diameter load wires to reduce resistance OVP Considerations The dc source s OVP circuit contains a crowbar SCR which effectively shorts the output of the dc source whenever the OVP trips If an external voltage source such as a battery is connected across the output and the OVP is inadvertently triggered the SCR will continuously sink a large current from the battery possibly damaging the dc source To avoid this program the OVP setting to its maximum value to prevent it from inadvertently tripping Additionally an internal fuse is connected in series with the SCR This fuse will open to prevent large currents from damaging the SCR If this internal fuse has opened The FS status annunciator will be set Refer to the Service Manual for instructions about replacing this fuse In addition the OVP circuit s SCR crowbar has been designed to discharge capacitances up to a specific limit These limits are HP 6631B 127 000 uF HP 6632B and 66322A 50 000 UF HP 6633B 20 000 uF HP 6634B 10 000 uF If your load capacitance approaches this limit it is recommended that you do not intentionally trip the OVP and discharge the capacitance through the SCR as part of
6. 0 01 0 3 WA Drift Voltage 0 01 0 25mV 0 01 0 5mV 0 01 1 mV 0 01 1 mV Current 0 01 100uA 0 01 50 uA 0 01 20 uA 0 01 10 uA Output Voltage Rise Fall Normal mode 2 ms Time Fast mode 400 us for a change from 10 to 90 or 90 to 10 of the total excursion Output Voltage Settling Normal mode 6 ms Time Fast mode 2 ms to settle within 1 LSB or 0 025 times the rated voltage of the final value For 8 volt unit between 0 and 10 mA the sink current remains at 10 mA For 20 volt unit between 0 and 5mA the sink current remains at 5 mA For 50 volt unit between 0 and 2 5 mA the sink current remains at 2 5 mA For 100 volt unit between 0 and 1 25 mA the sink current remains at 1 25 mA Following a 30 minute warm up the change in output over 8 hours under ambient temperature constant load and line operating conditions 50 Specifications A Table A 2 Supplemental Characteristics continued Parameter HP 66332A HP 6631B 6632B 6633B 6634B Dynamic Measurement Instantaneous Voltage 0 03 5 mV not applicable Accurac Instantaneous Current 0 6 2 mA Dynamic Measurement Buffer Length 4096 points not applicable System Sampling Rate Range 15 641s 31 200s Measurement Time voltage or current 50 ms average includes the default time of 30 ms for acquiring data and a 20 ms data processing overhead Command Processing 4 ms average Time for output to begin to ch
7. 000 Sets the output current Protection status example shows overcurrent tripped RST Places the dc source in the factory default state PON STATE RST Select the power on state command RST or RCLO PROT DLY 0 08 Sets the output protection delay in seconds RI LATCHING Sets the remote inhibit mode LATCHING LIVE or OFF DFI OFF Sets the discrete fault indicator state ON or OFF DFI SOUR OFF Selects the DFI source QUES OPER ESB RQS or OFF PORT RIDFI Sets the output port functions RIDFI or DIGIO DIGIO 7 Sets and reads the I O port value 0 through 7 RELAY ON Sets the output relay state ON or OFF RELAY NORM Sets the output relay polarity NORM or REV CURR DET ACDC Sets current measurement detector ACDC or DC em fer Use and _ to select menu parameters Us Meter to exit any menu and retum to metering mode Not available on HP 6631B 6634B or in Compatibility mode Not available on HP 6631B e jili li 13 1 Quick Reference SCPI Programming Commands At a Glance NOTE Most optional commands have been omitted for clarity Refer to the Programming Guide for a complete description of all programming commands ABORt CALibrate CURRent POSitive NEGative MEAS ure AC DATA lt n gt LEVel P1 P2 P3 P4 PAS Sword lt n gt SAVE STATe lt bool gt lt n gt VOLTage PROTection DISPlay lt bool gt MODE NORMal TEXT TEXT lt display_string gt INITiat
8. Action Press Shift Cal scroll to CAL VOLT PROT and press Enter Wait for the dc source to compute the OVP calibration constant The display returns to Meter mode when the calculation is complete Display RST 00 003V 0 0006A CAL ON 0 0 CAL DENIED OUT OF RANGE Display CAL VOLT CAL LEV P1 CAL DATA 0 00 CAL LEV P2 CAL DATA 0 00 Display CAL VOLT PROT Current Programming and High Range Measurement Calibration Verification and Calibration B Action Connect the appropriate current monitor as shown in figure B 1A Connect the DMM in dc mode across the current shunt Press Shift Cal scroll to CAL CURR and press Enter Press Shift Cal scroll to CAL LEV and press Enter to select the first calibration point Press Shift Cal and scroll to CAL DATA Wait for the DMM reading to stabilize Then read the DMM and compute the first current value DMM reading shunt resistance Use the Entry keypad to enter the first current value Press Shift Cal scroll to CAL LEV use to scroll to P2 the second calibration point and press Enter Press Shift Cal and scroll to CAL DATA Wait for the DMM reading to stabilize Then read the DMM and compute the second current value DMM reading shunt resistance Use the Entry keypad to enter the second current value Negative Current Programming Calibration 20 21 Action Connect a negative supply to the output in series with the appropriate load resist
9. HY STeresis CUR Rent a gt VOLTage lt n gt LEVel CURRent lt n gt VOLTage lt n gt SLOPe CURRent POS NEG EITH VOLTage POS NEG EITH SOURce BUS INTemal SEQuencel TRANsient IMMediate SOURce BUS SEQuencel DEFine TRANsient SEQuence2 DEFine ACQuire 1 Quick Reference The Rear Panel At a Glance HP IB IEEE 488 RS 232 interface PF INH FLT remote Output and Remote interface connector connector INHibit internal sense terminal block FauLT connector Connector plug is removable WORM WA FAST QUTPUT MODE easiNorma switch Fuse holder Power cord connector IEC 320 Use the front panel Address menu to Select the HP IB or RS 232 interface see chapter 4 in User s Guide Select the HP IB bus address see chapter 4 in User s Guide Configure the RS 232 interface see chapter 4 in User s Guide 15 General Information Document Orientation This manual describes the operation of the HP Model 66332A Dynamic Measurement DC Source and the HP Model 6631B 6632B 6633B 6634B System DC Power Supply Unless otherwise noted both units will be referred to by the description dc source throughout thi
10. Hz 3 5 A 250 W at full load 115 Vac mains 104 127 Vac 47 63 Hz 3 A 250 W 220 Vac mains 191 233 Vac 47 63 Hz 1 6 A 250 W 230 Vac mains 207 253 Vac 47 63 Hz 1 5 A 250 W Output Programming Voltage 0 8 190 V 0 20 475 V 0 51 188 V 0 102 38 V Range Current 0 10 237A 0 5 1188 A 0 2 0475 A 0 1 0238 A OVP 0 12V 0 22 V 0 55 V 0 110 V Average Programming Voltage 2mV Resolution Current 2 5 mA 60 mV 2 4 100 mV 2 4 240 mV 2 4 600 mV 2 4 1 2 V OVP Accurac OVP Maximum Current 14 3 A 6 66 A 2 43 A 1 21 A Measurement Average Current High Range 436 uA 213 pA 74 uA 37 pA Measurement Resolution Low Range 0 6 uA 0 6 uA 0 6 uA 0 6 uA Sink Current Sink Current Tracking SCPI mode 0 4 4 mA 0 4 2 mA 0 4 1 mA 0 4 0 5 mA Compatibility mode 500 mA 250 mA 100 mA 50 mA Minimum Current in 40 mA 20 mA 8mA 4mA Compatibility Mode Programming Accuracy Voltage 0 01 0 15 mV 0 01 0 25 mV 0 01 0 5 mV 0 01 1 mV Temperature Coefficient Current 0 01 60 uA 0 01 30 LA 0 01 12 WA 0 01 6 uA change C OVP 0 01 2 mV 0 015 4 mV 0 015 10 mV 0 015 20 mV Readback Accuracy Voltage 0 01 60 uV 0 01 150 uV 0 01 500 LV 0 01 750 LV Temperature Coefficient Current ACDC 0 05 320 uA 0 05 160 uA 0 05 80 uA 0 05 40 pA change C Current DC 0 02 50uA 0 02 25 uA 0 02 10 WA 0 02 5 pA Current Low range 0 01 0 3 uA 0 01 0 3 WA 0 01 0 3 WA
11. Setting the Output Voltage and Current Set the output voltage Action Display To enter an approximate value without using the voltage menu On the Entry 7 003V 0 004A keypad press or to select the 1 s digit in the voltage field Then rotate the front panel RPG knob to obtain 7 V If the unit is in CC mode you won t see the output voltage change until the voltage setting is low enough to cause the unit to go into CV mode The easiest way to enter an accurate value On the Function keypad press VOLT 7 000 Voltage On the Entry keypad press 7 Enter To make minor changes to an existing value On the Function keypad press VOLT 8 000 Voltage On the Entry keypad press or to select the digit in the numeric field that you wish to change For example move the flashing digit to the ones column to change a value in this column Then press to scroll from 7 000 to 8 000 Then press Enter Set the output current Action Display To enter an approximate value without using the current menu On the Entry 8 003V 0 900A keypad press or to select the tenths digit in the current field Rotate the front panel RPG knob to obtain 0 9A If the unit is in CV mode you won t see the output current change until the current setting is low enough to cause the unit to go into CC mode The easiest way to enter an accurate value On the Function keypad press CURR 0 900 Current On the Entry keypad press 9 Enter To make minor chan
12. The following table lists the characteristics of AWG American Wire Gage copper wire Table 3 2 Ampacity and Resistance of Stranded Copper Conductors AWG No Ampacity in free air Resistance at 20 deg C Q m QO ft 0 0345 0 01054 23 3 Installation Voltage Drops The load wires must also be large enough to avoid excessive voltage drops due to the impedance of the wires In general if the wires are heavy enough to carry the maximum short circuit current without overheating excessive voltage drops will not be a problem The voltage drops across the load wires should be limited to less than two volts Refer to Table 3 2 to calculate the voltage drop for some commonly used AWG copper wire Multiple Load Connections When the unit is in local sensing mode and you are connecting multiple loads to the output connect each load to the output terminals using separate load leads This minimizes mutual coupling effects and takes full advantage of the dc source s low output impedance Each pair of wires should be as short as possible and twisted or bundled to reduce lead inductance and noise pickup If cabling considerations require the use of distribution terminals that are located remotely from the dc source connect the dc source s output terminals to the remote distribution terminals by a pair of twisted or bundled wires Connect each load to the distribution terminals separately Remote voltage sensing is recommended under these circ
13. a location that allows sufficient space at the sides and back of the unit for adequate air circulation see Bench Operation Bench Operation A fan cools the dc source by drawing air in through the sides and exhausting it out the back Minimum clearances for bench operation are 1 inch 25 mm along the sides Do not block the fan exhaust at the rear of the unit Rack Mounting The dc source can be mounted in a standard 19 inch rack panel or cabinet Table 2 1 documents the HP part numbers for the various rack mounting options that are available for the dc source Installation instructions are included with each rack mount option NOTE Support rails or an instrument shelf is required when rack mounting units 7 425 5mm z 16 75 a CD 345 4mm 13 6 364 4mm 14 3 CaS GS Ca ee Ge L GSS 6S Gay E 8555 Co Co OO Od Oo Top UUUUUU Side 35 Hin E roma 0 eee T Rear Screw Size 5 32 x 3 8 Figure 3 1 Outline Diagram 22 Installation 3 Input Connections Connect the Power Cord 1 Unscrew the line fuse cap from the rear panel and verify that the fuse rating matches what is specified on the FUSES label on the rear panel Reinstall the fuse See table 3 1 for fuse part numbers 2 Connect the power cord to the IEC 320 connector on the rear of the unit If the wrong power cord was shipped with your unit co
14. accuracy 55 current programming 55 equipment 53 setup 53 test record 57 voltage measurement accuracy 55 voltage programming 55 verification tests 31 W warranty 2 wire current ratings 23 wiring considerations 23 73 HP Sales and Support Office For more information call your local HP sales office listed in your telephone directory or an HP regional office listed below for location of your nearest sales support office United States of America Hewlett Packard Company Test and Measurement Organization 5301 Stevens Creek Blvd Bldg 51L 5C Santa Clara CA 95052 8059 800 452 4844 Asia Pacific Hewlett Packard Asia Pacific Ltd 17 21 F Shell Tower Time Square 1 Matheson Street Causeway Bay Hong Kong 852 2599 7070 Australia New Zealand Hewlett Packard Australia Ltd 31 41 Joseph Street Blackburn Victoria 3130 Australia 131 347 ext 2902 Canada Hewlett Packard Canada Ltd 5150 Spectrum Way Mississauga Ontario L4W 5Gl 905 206 4725 74 Europe Hewlett Packard European Marketing Center P O Box 999 1180 AZ Amstelveen The Netherlands Japan Yokogawa Hewlett Packard Ltd Measurement Assistance Center 9 1 Takakura Cho Hachioji Shi Tokyo 192 Japan 81 426 48 3860 Latin America Hewlett Packard Latin American Region Headquarters 5200 Blue Lagoon Drive 9th Floor Miami Florida 33126 U S A 305 267 4245 4220 Manual Updates The following updates have
15. been made to this manual since the November 1997 printing indicated on the Printing History page 7 8 99 Additional information about CV mode operation has been added to page 20 A note has been added to Table A 1 for the Ripple and Noise specifications and a correction has been made for Model HP 6631B Steps 22 and 23 on page 61 under Low Range Current Measurement Calibration have been switched
16. condition has been removed press Shift Prot Clr The OCP annunciator then will go off 3 Making Front Panel Measurements When the dc source is operating in front panel meter mode all front panel measurements are calculated from a total of 2048 readings taken at a 46 8 microsecond sampling rate The unit alternates between voltage and current measurements Therefore the data acquisition time for a single front panel voltage or current measurement is about 100 milliseconds The sample rate and number of data points are fixed and there are no trigger controls for front panel measurements This fixed sampling rate and data acquisition time combined with a built in windowing function reduces errors due to sampling a non integral number of cycles of a waveform for frequencies of 25 Hz or greater Note that the windowing function is less accurate when measuring output waveforms for frequencies less than 25 Hz causing the front panel meter to jitter When controlling the unit over the HP IB interface you can vary both the sampling rate and the number of data points in each measurement If you are using the HP 66332A dc source to measure waveform data the HP IB interface also lets you qualify the triggers that initiate the measurements With this flexibility measurement accuracy can be improved for waveforms with frequencies as low as several Hertz Refer to chapter 3 in the Programming Guide for more information Two current measurement ranges
17. connect the ac input wiring harness according to the information in the following figure grey grey white red grey white red grey Front of unit Z Z Front of unit Side of gt Sideof gt transformer g transformer 120 VAC 220 VAC grey grey white red grey white red grey r Front of unit 2 Front of unit lt gt Side of Side of x transformer transformer 100 VAC 230 240 VAC Figure D 1 Power Transformer AC Input Connections 69 D Line Voltage Conversion Install the Correct Line Fuse Unscrew the line fuse cap from the rear panel and install the correct fuse For 100 120 Vac operation 4 A HP part number 2110 0055 For 220 230 Vac operation 2 A HP part number 2110 0002 Mark the voltage setting that the unit has been set to on the rear panel label Close the Unit 70 Replace the outer cover Reconnect the power cord and turn on the unit Index Lapel ag terminals 23 S S terminals 23 0 9 41 ac line conversion 69 accessories 18 ACDC current detector 44 airflow 22 annunciators Addr 36 Cal 36 CC 36 CV 36 Dis 36 Err 36 OCP 36 Prot 36 Rmt 36 Shift 36 SRQ 36 Unr 36 AWG ratings 23 C cables 18 calibration 59 current programming high range 61 current programming low range 61 enable 60 equipment 53 error messages 62 menu 59 OVP 60 p
18. entry field 39 5 Front Panel Operation Output Control Keys Output control keys control the output functions of the dc source 40 Press this key to access the voltage menu Display Command Function VOLT lt value gt Sets the output voltage Press this key to access the current menu Display Command Function CURR lt value gt Sets the output current Press this key to access the output menu list Display Command Function RST Places the dc source in the factory default state PON STATE lt char gt Select the power on state command RST or RCLO RI lt char gt Sets the remote inhibit mode LATCHING LIVE or OFF DFI lt char gt Sets the discrete fault indicator state ON or OFF DFI SOUR lt char gt Selects the DFI source QUES OPER ESB RQS or OFF PORT lt char gt Sets the output port functions RIDFI or DIGIO DIGIO lt char gt Sets and reads the I O port value 0 through 7 RELAY lt char gt Set relay state independent of output CON or OFF REL POL lt char gt Set relay polarity C NORM or REV PROT DLY lt value gt Sets the output protection delay in seconds Press this key to display protection status Display Command Function OC OT OV RI FS Status of the protection features example shows all tripped Status of the protection features example shows none tripped Press this key to access the overvoltage protection menu Display Command Function VOLT PROT lt value gt Sets
19. fully understood and met The CAUTION sign denotes a hazard It calls attention to an operating procedure or the like which if not correctly performed or adhered to could result in damage to or destruction of part or all of the product Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met Declaration Page DECLARATION OF CONFORMITY according to ISO IEC Guide 22 and EN 45014 Manufacturer s Name Hewlett Packard Company Manufacturer s Address 150 Green Pond Road Rockaway New Jersey 07866 U S A declares that the Product Product Name a Dynamic Measurement DC Source b System DC Power Supply Model Number a HP 66332A b HP 6631B 6632B 6633B 6634B conforms to the following Product Specifications Safety IEC 1010 1 1990 A1 1992 EN 61010 1 1993 EMC CISPR 11 1990 EN 55011 1991 Group 1 Class B IEC 801 2 1991 EN 50082 1 1992 4 kV CD 8 kV AD IEC 801 3 1984 EN 50082 1 1992 3 V m IEC 801 4 1988 EN 50082 1 1992 0 5 kV Signal Lines 1 kV Power Lines Supplementary Information The product herewith complies with the requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC and carries the CE marking accordingly New Jersey November 1997 Location Date Bruce Krueger Quality Manager European Contact Your local Hewlett Packard Sales and Service Office or Hewlett Packard GmbH Department TRE Herrenberger Strasse 130
20. keypad You can use any number with up to six digits and an optional decimal point If you want the calibration function to operate without requiring any password change the password to 0 zero NOTE If you want the calibration function to operate without requiring any password change the password to 0 zero Calibration Over the HP IB You can calibrate the dc source by using SCPI commands within your controller programming statements Be sure you are familiar with calibration from the front panel before you calibrate from a controller Each front panel calibration command has a corresponding SCPI command When you write your calibration program perform the calibration procedure in the same order as the front panel procedure documented in this appendix The SCPI calibration commands are explained in chapter 3 of the dc source Programming Guide Calibration error messages that can occur during HP IB calibration are shown in table B 3 63 Error Messages Error Number List This appendix gives the error numbers and descriptions that are returned by the dc source Error numbers are returned in two ways Error numbers are displayed on the front panel Error numbers and messages are read back with the SYSTem ERRor query SYSTem ERRor returns the error number into a variable and returns two parameters an NRI and a string The following table lists the errors that are associated with SCPI syntax errors and interface problems I
21. length satisfied Block data not allowed Expression error Invalid expression Expression data not allowed Execution Errors 200 through 299 sets Standard Event Status Register bit 4 Execution error generic Data out of range e g too large for this device Too much data out of memory block string or expression too long Illegal parameter value device specific Out of memory Macro error Macro execution error Illegal macro label Macro recursion error Macro redefinition not allowed System Errors 300 through 399 sets Standard Event Status Register bit 3 System error generic Too many errors errors beyond 9 lost due to queue overflow Query Errors 400 through 499 sets Standard Event Status Register bit 2 Query error generic Query INTERRUPTED query followed by DAB or GET before response complete Query UNTERMINATED addressed to talk incomplete programming message received Query DEADLOCKED too many queries in command string Query UNTERMINATED after indefinite response Error Messages C Selftest Errors 0 through 99 sets Standard Event Status Register bit 3 No error Non volatile RAM RDO section checksum failed Non volatile RAM CONFIG section checksum failed Non volatile RAM CAL section checksum failed Non volatile RAM STATE section checksum failed Non volatile RST section checksum failed RAM selftest VDAC IDAC selftest 1 VDAC IDAC selftest 2 VDAC IDAC se
22. load resistance In figure 2 1 operating point 1 is defined by the load line traversing the positive operating quadrant in the constant voltage region Operating point 2 is defined by the load line traversing the positive operating quadrant in the constant current region Figure 2 1 also shows a single range two quadrant capability This means that the dc source is capable of sourcing as well as sinking current over the output voltage range from zero volts to the rated maximum The negative quadrant is identical to the positive quadrant However the negative current cannot be set independently it tracks the value programmed for the positive current Thus if the positive current is set to 1 A the negative current is also set to 1 A NOTE If you attempt to operate the dc source beyond its output ratings the output of the unit will become unregulated This is indicated by the UNR annunciator on the front panel The output may also become unregulated if the ac input voltage drops below the minimum rating specified in Appendix A Appendix A documents the dc source s specifications and supplemental characteristics 20 Installation Inspection Damage When you receive your dc source inspect it for any obvious damage that may have occurred during shipment If there is damage notify the shipping carrier and the nearest HP Sales and Support Office immediately The list of HP Sales and Support Offices is at the back of this guide War
23. measurement when controlling the unit over the HP IB interface Refer to chapter 3 in the Programming Guide Press this key to access the meter menu list Also use this key to exit a menu at any time and return to meter mode Display Measurement lt reading gt V Measures output dc voltage and current lt reading gt A lt reading gt V MAX Measures peak output voltage lt reading gt V MIN Measures minimum output voltage lt reading gt V HIGH Measures the high level of a voltage pulse waveform lt reading gt V LOW Measures the low level of a voltage pulse waveform lt reading gt V RMS Measures rms voltage lt reading gt A MAX Measures peak output current lt reading gt A MIN Measures minimum output current lt reading gt A HIGH Measures the high level of a current pulse waveform lt reading gt A LOW Measures the low level of a current pulse waveform lt reading gt A RMS Measures rms current Press this key to access the following metering functions Display Command Function CURR RANGE lt char gt Select current range AUTO LOW or HIGH CURR DET lt char gt Select current measurement bandwidth ACDC or DC Notes Available on HP Model 66332A in SCPI language mode only reading the returned measurement value a numeric value char a character string parameter Usep and CE to scroll through the menu commands Usel and to scroll through the menu parameters Usel __ and U to select a digit in a numeric
24. menu All menu lists are circular you can return to the starting position by continuously pressing either key These keys let you select the previous or the next parameter for a specific command If the command has a numeric range these keys increment or decrement the existing value In meter mode these keys can be used to adjust the magnitude of the output voltage or current Only the flashing digit is changed by these keys Use the and keys to move the flashing digit These Entry keys move the flashing digit in a numeric entry field to the right or left This lets you increment or decrement a specific digit in the entry field using the and okeys or the RPG knob The backspace key is an erase key If you make a mistake entering a digit and have not yet pressed Enter you can delete the digit by pressing Backspace Delete more digits by repeatedly pressing this key Executes the entered value or parameter of the presently accessed command Until you press this key the parameters you enter with the other keys are displayed but not entered into the dc source After pressing Enter the dc source returns to Meter mode 31 4 Turn On Checkout Checkout Procedure The test in this section checks for output voltage and current on the dc source NOTE terminals together To perform the checkout procedure you will need a wire for shorting the output The following procedure assumes that the unit turns on in the factory def
25. overvoltage protection level This key accesses the calibration menu Refer to Appendix B to calibrate your dc source Notes These parameters are stored in non volatile memory These status summary bits are explained in chapter 3 of the Programming Guide value a numeric value char a character string parameter Uselo_ and a to scroll through the menu commands Usel _ and to scroll through the menu parameters Usel and L to select a digit in a numeric entry field Front Panel Operation 5 Entry Keys Refer to the examples later in this chapter for more details on the use of these keys Figure 5 4 Entry Keys These keys let you scroll through choices in a parameter list that apply to a specific command Parameter lists are circular you can return to the starting position by continuously pressing either key If the command has a numeric range these keys increment or decrement the existing value In meter mode these keys can be used to adjust the magnitude of the output voltage or current Only the flashing digit is changed by these keys Use the and keys to move the flashing digit These keys move the flashing digit in a numeric entry field to the right or left This lets you increme
26. 1 A Specifications Table A 2 Supplemental Characteristics continued Parameter Digital I O Characteristics Maximum ratings Digital OUT Port 0 1 2 open collector Digital IN Port 2 internal pull up Isolation to Ground Recommended Calibration Interval Regulatory Compliance Listing pending Certified to Conforms to Complies with Dimensions see figure 3 1 HP 66332A HP 6631B 6632B 6633B 6634B same as INH FLT Characteristics Output leakage 16V 0 1 mA ports 0 1 12 5 mA port 2 Output leakage 5V 0 1 mA ports 0 1 0 25 mA port 2 Low level output sink current 0 5 V 4 mA Low level output sink current 1 V 50 mA Low level input current 0 4 V 1 25 mA High level input current 5 V 0 25 mA Low level input voltage 0 8 V max High level input voltage 2 0 V min 240 Vdc maximum from chassis ground 1 year from the date the unit is put into service UL 3111 1 CSA 22 2 No 1010 1 IEC 1010 1 EMC directive 89 336 EEC ISM Group Class B Height 88 1mm 3 5in Width 425 5mm 16 75in Depth 364 4mm 14 3in Net weight Shipping weight 12 7 kg 28 lbs 15 kg 33 Ibs 52 Verification and Calibration Introduction This appendix includes verification and calibration procedures for the HP 66332A and HP 663 1B 6632B 6633B 6634B dc source Instructions are given for performing the procedures either from the front panel or from a controller over the HP I
27. B The verification procedures do not check all the operating parameters but verify that the dc source is performing properly Performance Tests which check all the specifications of the dc source are given in the applicable dc source Service Manual Important Perform the verification procedures before calibrating your dc source If the dc source passes the verification procedures the unit is operating within its calibration limits and does not need to be recalibrated Equipment Required The equipment listed in the following table or the equivalent to this equipment is required for verification and calibration Table B 1 Equipment Required Characteristics Recommended Model Digital Voltmeter Resolution 10 nV 1 V HP 3458A Readout 8 5 digits Accuracy gt 20 ppm 15 A 0 1 Q 0 04 TC 5ppm C Guildline 9230 15 Load Resistor 400Q HP 6631B calibration used for 3 W min TC 20ppm C verification of all models HP p n 0811 2878 1 1 kQ HP 6632B 66332A calibration 2 5 kQ HP 6633B calibration 5 kQ HP 6634B calibration Power Supply 8V I10A HP 6631B HP IB Controller Full HP IB capabilities HP Series 200 300 or equivalent The 4 terminal current shunt is used to eliminate output current measurement error caused by voltage drops in the load leads and connections It has special current monitoring terminals inside the load connection terminals Connect the voltmeter directly to these current monitoring termina
28. IN lt reading gt A HIGH lt reading gt A LOW lt reading gt A RMS Front Panel Operation 5 4 Programming the Digital Output Port Your dc source is shipped with the output port function set to RIDFI mode In this mode the port functions as a remote inhibit input with a discrete fault indicator output signal You can also configure the port to act as a Digital Input Output device To configure the RIDFI mode of the port proceed as follows Action 1 On the Function keypad press Output 2 Scroll through the Output menu by pressing q The PORT command lets you select either the RIDFI or the DIGIO function 3 Scroll to the RI command to configure the Remote INHibit indicator Use the and d amp eys to select either LIVE or LATCHING either of which enable the RI indicator With RI enabled a low true on the INH input will disable the output of the unit LIVE causes the output of the unit to track the state of the INH input LATCHING latches the output of the unit off in response to the inhibit signal 4 Access the Output menu again and scroll through the menu The DFI command lets you enable the Discrete Fault Indicator Use the dkey and select ON to enable the FLT output With the FLT output enabled the open collector logic signal can be used to signal external devices when a fault condition is detected 5 Scroll to the DFI SOUR command to select the internal source that drives this signal Use the dey to select from th
29. P SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY ASSISTANCE The above statements apply only to the standard product warranty Warranty options extended support contacts product maintenance agreements and customer assistance agreements are also available Contact your nearest Hewlett Packard Sales and Service office for further information on HP s full line of Support Programs Safety Summary The following general safety precautions must be observed during all phases of operation of this instrument Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument Hewlett Packard Company assumes no liability for the customer s failure to comply with these requirements GENERAL This product is a Safety Class instrument provided with a protective earth terminal The protective features of this product may be impaired if it is used in a manner not specified in the operation instructions Any LEDs used in this product are Class 1 LEDs as per IEC 825 1 ENVIRONMENTAL CONDITIONS This instrument is intended for indoor use in an installation category II pollution degree 2 environment It is designed to operate at a maximum relative humidity of 95 and at altitudes of up to 2000 meters Refer to the specifications tables for the
30. USER S GUIDE Dynamic Measurement DC Source HP Model 66332A System DC Power Supply HP Model 6631B 6632B 6633B 6634B For instruments with Serial Numbers HP 66332A US36320401 and up HP 6631B US37470101 and up HP 6632B US36350826 and up HP 6633B US36390236 and up HP 6634B US36380206 and up Cie HEWLETT PACKARD HP Part No 5962 8196 Microfiche Part No 5962 8197 Printed in USA July 1999 Warranty Information CERTIFICATION Hewlett Packard Company certifies that this product met its published specifications at time of shipment from the factory Hewlett Packard further certifies that its calibration measurements are traceable to the United States National Bureau of Standards to the extent allowed by the Bureau s calibration facility and to the calibration facilities of other International Standards Organization members WARRANTY This Hewlett Packard hardware product is warranted against defects in material and workmanship for a period of three years from date of delivery HP software and firmware products which are designated by HP for use with a hardware product and when properly installed on that hardware product are warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery During the warranty period Hewlett Packard Company will at its option either repair or replace products which prove to be defective HP does not warrant th
31. ac mains voltage requirements and ambient operating temperature range BEFORE APPLYING POWER Verify that the product is set to match the available line voltage the correct fuse is installed and all safety precautions are taken Note the instrument s external markings described under Safety Symbols GROUND THE INSTRUMENT To minimize shock hazard the instrument chassis and cover must be connected to an electrical ground The instrument must be connected to the ac power mains through a grounded power cable with the ground wire firmly connected to an electrical ground safety ground at the power outlet Any interruption of the protective grounding conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury ATTENTION Un circuit de terre continu est essentiel en vue du fonctionnement s curitaire de l appareil Ne jamais mettre l appareil en marche lorsque le conducteur de mise la terre est d branch FUSES Only fuses with the required rated current voltage and specified type normal blow time delay etc should be used Do not use repaired fuses or short circuited fuseholders To do so could cause a shock or fire hazard DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Do not operate the instrument in the presence of flammable gases or fumes DO NOT REMOVE THE INSTRUMENT COVER Operating personnel must not remove instrument covers Component replacement and inter
32. ance In Fast mode the dc source can maintain stability only for small capacitive loads These limits are HP 6631B 2 2 uF HP 6632B and 66322A 1 0 uF HP 6633B 0 22 uF HP 6634B 0 10 uF Inductive Loading Fast mode is recommended for driving inductive loads although you will typically experience stable conditions in Normal mode Inductive loads present no loop stability problems in constant voltage operation but may cause problems in constant current operation if the load impedance is outside the boundaries mentioned below The ratio of the load inductance L to the sum of the Equivalent Series Resistance ESR for the load R1 and dc source Rs determines whether the source can drive a load without becoming unstable To help determine this ratio the value of Rs is listed as HP 6631B 0 1 ohm HP 6632B and 66322A 0 2 ohm HP 6633B 1 0 ohm HP 6634B 2 0 ohm If the ratio L R1 Rs is less than 0 005 the dc source can reliably drive the load INH FLT Connections 27 3 Installation This rear panel connector has a fault output port and an inhibit input port The fault FLT output also referred to as the DFI discrete fault indicator signal in the front panel and SCPI commands is an open collector circuit that pulls the positive output low with respect to the negative chassis referenced common The high impedance inhibit INH input also referred to as the RI remote inhibit signal in the front panel and SCPI co
33. ange following receipt of digital data Up to 2 V can be dropped across each load lead add 2 mV to the voltage load regulation specification for each 1 V change in the positive output lead due to load current change Savable Instrument States 4 in locations 0 to 3 applies only in SCPI mode RS 232 Interface Baud rates 300 600 1200 2400 4800 9600 Capabilities Data formats 7 bits even or odd parity 8 bits without parity Language SCPI or COMPatibility Remote Sense Capability HP IB Interface Language SCPI or COMPatibility Capabilities Interface AH1 CO DC1 DT1 E1 L4 PPO RL1 SH1 SR1 T6 INH FLT Characteristics Maximum ratings 16 5 Vdc between terminals 1 and 2 3 and 4 and from terminals 1 or 2 to chassis ground FLT Terminals Low level output current 1 25 mA max Low level output voltage 0 5 V max INH Terminals Low level input voltage 0 8 V max High level input voltage 2 V min Low level input current 1 mA Pulse width 100 us min Time delay 4 ms typical For full scale current changes with a risetime of 20 us an additional 0 5 error exists in the first data point in the buffer after the change The error percentage increases proportionally with the decrease in risetime This time may be reduced by changing the default conditions of 2048 data points however measurement accuracy will be reduced COMPatibility language is used to program the HP 663xA Series power supplies 5
34. assword 63 peak current 61 saving 62 setup 53 voltage measurement 60 voltage programming 60 capacitive loading 27 capacitor discharge limit 26 CC mode 42 checkout procedure 32 cleaning 21 clear protection 43 controller connections 30 controls and indicators 19 conversion ac line 69 crowbar circuit 26 current measurement range 43 CV mode 20 42 D damage 21 DC current detector 44 DFI signal 28 DIGIO 45 digital connector 21 28 digital I O 28 digital output port 45 dimensions 22 disabling multiple units 28 enable output 42 enter value 42 entry keys 41 41 0 9 41 Backspace 41 Clear Entry 41 Enter Number 41 error messages 34 error numbers 65 fast mode 27 features 19 FLT 45 FLT output 28 front panel 19 35 annuncuiators 36 connections 23 controls and indicators 35 keys 36 FS 38 43 FS status 26 function keys 38 p 38 Cal 40 Current 40 immediate action 38 Input 39 Meter 39 71 Index OCP 38 Output 40 Output On Off 38 OV 40 Prot Clear 38 Protect 40 Voltage 40 fuses 23 G ground earth 18 guide programming 17 guide user s 17 H history 6 HP IB 46 address 46 connections 30 interface 30 inductive loading 27 INH 45 INH input 28 input connections 23 power 18 inspection 21 1 line fuse replacing 34 line voltage conversion 69 load line 20 load
35. at the operation for the software firmware or hardware shall be uninterrupted or error free For warranty service with the exception of warranty options this product must be returned to a service facility designated by HP Customer shall prepay shipping charges by and shall pay all duty and taxes for products returned to HP for warranty service Except for products returned to Customer from another country HP shall pay for return of products to Customer Warranty services outside the country of initial purchase are included in HP s product price only if Customer pays HP international prices defined as destination local currency price or U S or Geneva Export price If HP is unable within a reasonable time to repair or replace any product to condition as warranted the Customer shall be entitled to a refund of the purchase price upon return of the product to HP LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer Customer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation and maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED HP SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER S SOLE AND EXCLUSIVE REMEDIES H
36. ault state If you need more information about the factory default state refer to the RST command in chapter 4 of the Programming Guide Note that the values shown in the Display column may not exactly match the values that appear on the front panel of your unit If you have not already done so connect the power cord to the unit and plug it in Model Voltage OV Prot Current 6631B 8 8 8 10 6632B 66332A 20 22 5 6633B 50 55 2 6634B 100 110 1 Procedure Display 1 Turn the unit on The dc Se BREA SE source undergoes a self test when you first turn it on ADDRESS 5 0 2410V 0006A Table 4 1 Checkout Programming Values Note This checkout procedure is written for models 6632B and 66332A If you have another model enter the correct values from the table Where the procedure calls for an lt input gt Explanation During selftest all display segments are briefly lit followed by the HP IB Address The display then goes into meter mode with the Dis annunciator on and all others off In Meter mode the V digits indicate the output voltage and the A digits indicate the output current The flashing digit on the display indicates the digit that will be affected if changes are made to the displayed values using the rotary control or the and Yockeys You will only see the changes if the output is ON Press the Meter key to exit a menu at any time and return to meter mode If the Err annunciator on the display is on pre
37. can be selected in the Input menu A high current range is available for measuring output currents up to the 30 higher than the maximum rating of the dc source A low current range is available for improved resolution when measuring output currents below 20 milliamperes The low current measurement range is accurate to 0 1 of the reading 2 5 microamperes When the current Range is set to AUTO the unit automatically selects the range that provides the best measurement resolution NOTE If the front panel display indicates OVLD the output has exceeded the measurement capability of the instrument If the front panel display indicates an HP IB measurement is in progress 43 5 Front Panel Operation As previously mentioned the HP 66332A dc source has the capability of measuring output waveform parameters such as peak minimum high level and low level as illustrated in the following figure V or AMAX V or A HIGH 46 8 microsecond sampling rate NOTE Measurement samples may not coincide with the actual maximum or minimum point of the waveform V or A LOW bee Vor AMIN 100 millisecond acquisition time Figure 5 5 Front Panel Pulse Measurement Parameters HP 66332A only Use the Meter menu for making front panel measurements Note Action Display For current measurements press Shift Input Then press Yoantil you CURR RANG AUTO obtain the CURR RANG AUTO command Press En
38. cations Specifications Table A 1 lists the specifications of the dc source Specifications are warranted over the ambient temperature range of 0 to 55 C Unless otherwise noted specifications apply when measured at the rear terminals after a 30 minute warm up period Table A 1 Performance Specifications HP 6633B Parameter HP 6631B HP 6632B HP 6634B HP 66332A Output Ratings 0 8 V 0 20 V 0 50 V Current 0 10A 0 5A 0 2A Programming Accuracy Voltage 0 05 5 mV 0 05 10 mV 0 05 20 mV 0 05 50 mV 25C 5 C Current 0 05 4 mA 0 05 2 mA 0 05 1 mA 0 05 0 5 mA DC Measurement Voltage 0 03 2 mV 0 03 3 mV 0 03 6 mV 0 03 12 mV Accuracy Low Current range via HP IB or front panel 20 mA to 20 mA 0 1 2 5 pA 0 1 2 5 uA 0 1 2 5 pA 0 1 2 5 uA meters with respect to actual output at 25C 5 C High Current range 20 mA to rated I 20 mA to rated I 0 2 1 mA 0 2 1 6 mA 0 2 0 5 mA 0 2 1 1 mA 0 2 0 25 mA 0 2 0 85 mA 0 2 0 25 mA 0 2 0 85 mA Ripple and Noise Normal mode voltage Gn the range of 20 Hz to rms p p 0 3 mV 3 mV 0 3 mV 3 mV 0 5 mV 3 mV 0 5 mV 3 mV 20 MHz with outputs Fast mode voltage ungrounded or with rms p p 1 mV 10 mV 1 mV 10 mV 1 mV 15 mV 2 mV 25 mV either terminal grounded Current rms 3 mA 2 mA 2 mA 2 mA Load Regulation Voltage 2mV 2mV 4mvV 5mV change in output vol
39. ce Immediate Action Keys A toggle switch that turns the output of the de source on or off Activates front panel control when the unit is in remote mode unless a Lockout command is in effect Resets the protection circuit and allows the unit to return to its last programmed state A toggle switch that enables or disables overcurrent protection 12 1 Quick Reference Front Panel Menus At a Glance ADDRESS 7 Sets the HP IB Address INTF HPIB Selects an interface HPIB or RS232 BAUDRATE 300 Selects baud rate 300 600 1200 2400 4800 9600 PARITY NONE Selects message parity NONE EVEN ODD MARK SPACE FLOW NONE Selects flow control XON XOFF RTS CTS DTR DSR NONE LANG SCPI Selects language SCPI or COMP ARCLO Recalls instrument state SAV 0 Saves present instrument state ERROR 0 Displays errors in SCPI error queue 12 000V 0 204A Measures output voltage and current 12 500V MAX Measures peak output voltage 1 000V MIN Measures minimum output voltage 12 330V HIGH Measures the high level of a voltage pulse waveform 0 080V LOW Measures the low level of a voltage pulse waveform 12 000V RMS Measures rms voltage 0 350A MAX Measures peak output current 0 050A MIN Measures minimum output current 0 400A HIGH Measures the high level of a current pulse waveform 0 012A LOW Measures the low level of a current pulse waveform 0 210A RMS Measures ms current VOLT 20 000 Sets the output voltage CURR 2
40. d d amp eys let you select the command parameters 46 Front Panel Operation 5 7 Saving and Recalling Operating States NOTE This capability is only available when the unit is set to the SCPI programming language You can save up to 4 states from location 0 to location 3 in non volatile memory and recall them from the front panel All programmable settings are saved Save an operating state in location 1 as follows Action Display 1 Set the instrument to the operating state that you want to save 2 Save this state to location 1 Press Save 1 Enter SAV 1 Recall a saved state as follows Action Display 1 Recall the state saved in location 1 by pressing Recall 1 Enter RCL 1 Select the power on state of the dc source as follows Action Display 1 On the Function keypad press Output and scroll through the Output PON STATE RST menu until you get to the PON state command Di Use the and d amp eys to select either RST or RCLO RST sets the power on state of the unit as defined by the RST command RCLO sets the power on state of the unit to the state saved in RCL location 0 Clear the non volatile memory of the dc source as follows Action Display 1 On the Function keypad press Output Enter This returns the unit to RST the factory default settings 2 Save these settings to location 1 Press Save 1 Enter SAV 1 3 Repeat step 2 for memory locations 2 through 4 SAV 2 SAV 3 SAV 4 47 Specifi
41. difference between the two readings in the table Turn off the dc source and connect the current monitor and external supply to the output of the unit as shown in figure B 1D Set the DMM to operate in de voltage mode Turn on the external supply and program its voltage to 5 volts and current for the full scale current rating of the UUT Program the dc source to 0 V and full scale current see table B 2 Press Output On Off to enable the output Divide the voltage drop across the current monitor by its resistance to convert the value to amperes Record this value as well as the current reading on the front panel display Enter the difference between the two readings in the table Readings within high current limits see tables B 3 4 5 or 6 Normal Result CURR RANG LOW Output current near 0 A Readings within low current measurement see table B 3 4 5 or 6 Output current near 20 mA Readings within high current measurement see table B 3 4 5 or 6 Normal Result CURR RANG LOW CURR DET DC Output current near 20 mA Readings within low current sink measurement see table B 3 4 5 or 6 Output near full scale current Readings within high current sink measurement see table B 3 4 5 or 6 Verification and Calibration B Table B 3 Verification Test Record for HP 6631B Model HP 6631B Report No Date Test Description Minimum Recorded Results Maximum Specification Specificati
42. e SEQuence 1 22 NAME TRANsient ACQuire CONTinuous SEQuence 1 lt bool gt NAME TRANsient lt bool gt MEASure FETCh ARRay CURRent 1 VOLTage CURRent DC 2 ACDC HIGH 2 LOW MAX MIN VOLTage DC 2 LOWRange OUTPut lt bool gt NORelay DFI lt bool gt SOURce QUES OPER ESB RQS OFF PON STATe RST RCLO PROTection CLEar DELay lt n gt RELay STATe lt bool gt 3 POLarity NORM REV3 RI MODE LATCHing LIVE OFF Not available on HP 6631B 6634B 2Fetch commands not available on HP 6631B 6634B 3 Not available on HP 6631B 14 SENSe CURRent RANGe gt DETector ACDC DC FUNCtion VOLT CURR SWEep OFFSet POINts n gt POINts lt n gt TINTerval gt SOURce CURRent lt n gt TRIGgered lt n gt PROTection STATe lt bool gt DiGital DATA gt FUNCtion RIDF DIG VOLTage lt n gt TRIGgered lt n gt PROTection lt n gt ALC BANDwidth BWIDth STATus PRESet OPER ation EVE Nt CONDition ENABIe lt n gt NTRansition lt n gt PTRansition lt n gt QUEStionable EVENt CONDition ENABIe lt n gt NTRansition lt n gt PTRansition lt n gt SYSTem ERR or LANGuage SCPI COMPatibility VERSion LOCal REMote RWLock TRIGger SEQuence 2 AC Quire IMMediate COUNt CURRent lt n gt VOLTage lt n gt
43. e RQS or ESB bits or the Operation or Questionable status registers Status summary bits are explained in chapter 3 of the Programming Guide To configure the DIGIO mode of the port proceed as follows Action 1 On the Function keypad press Output 2 Scroll through the Output menu by pressing q The PORT command lets you select either the RIDFI or the DIGIO function 3 Scroll to the DIGIO command to set and read the Digital Input Output Port Enter a number from 0 to 7 to program the four bits 0 programs all bits low 7 programs all bits high Press Enter when done Display RST PORT RIDFI RI LIVE RI LATCHING DFI ON DFI SOUR RQS DFI SOUR ESB DFI SOUR OPER DFI SOUR QUES Display RST PORT DIGIO DIGIO 5 45 5 Front Panel Operation 5 Programming the Output Relay option 760 only Units with option 760 have isolation and polarity reversal relays connected to the output and sense terminals Option 760 is not available on HP 6631B units To control the relays independently of the Output On Off switch proceed as follows Action Display 1 On the Function keypad press Output and scroll through the Output RELAY ON menu until you get to the RELAY command The display indicates whether the relay is presently closed ON or open OFF 2 Use the and deys to select either ON to close the relay or OFF to RELAY OFF open the relay Note that the output relays always open or close whenever the Output On O
44. e protection status state Set and clear protection functions Set the output state at power on Calibrate the dc source p and q scroll through the front panel menu commands Entry keys let you Enter programming values Increment or decrement programming values and o select the front panel menu parameters Front Panel Operation 5 System Keys Refer to the examples later in this chapter for more details on the use of these keys Figure 5 2 System Keys This is the blue unlabeled key which is also shown as Shit Jn this guide Pressing this key accesses the alternate or shifted function of a key such as ERROR Release the key after you press it The Shift annunciator is lit indicating that the shifted keys are active Press to change the dc source s selected interface from remote operation to local front panel operation Pressing the key will have no effect if the interface state is already Local Local with Lockout or Remote with Lockout Press to access the system address menu This menu lets you configure the dc source s interface Address Menu entries are stored in non volatile memory Display Command Function ADDRESS lt value gt Sets the HP IB Address INTF lt char gt Selects an interface HPIB or RS232 BAUDRATE lt value gt Selects baud rate 300 600 1200 2400 4800 9600 PARITY lt char gt Message parity NONE EVEN ODD MARK SPACE FLOW lt char gt Flow control KON XOFF RTS CTS DTR DSR NONE LANG
45. f the fuse is defective replace it with a fuse of the same type see Input Connections in chapter 3 4 Turn on the dc source and check the operation NOTE If the dc source has a defective fuse replace it only once If it fails again the dc source requires service 34 Front panel Operation Introduction Here is what you will find in this chapter a complete description of the front panel controls front panel programming examples NOTE The dc source must be in set to Local mode to use the front panel controls Press the Local key on the front panel to put the unit in local mode Front Panel Description PACKARD DYM le Me asureme i ieSYSTEME EF UNCTIONSE PES ENTRY SNORE aoe OUTP Teste dpat F PEE ELELLA CELE wooo R cyce Umr De OCP Pral Cal Shit Rmi Add Err SRG o o F J E E Q a E H D FOF J l on Sn se Te ne ee ee Figure 5 1 Front Panel Overall View 35 5 Front Panel Operation Display 2 Annunciators Rotary Control Output Connectors Line System Keys Function Keys O Entry Keys 36 14 character vacuum fluorescent display for showing output measurements and programmed values Annunciators light to indicate operating modes and status conditions CV The dc source output i
46. ff key is pressed To control the polarity of the output relays proceed as follows Action Display 1 On the Function keypad press Output and scroll through the Output REL POL NORM menu until you get to the REL POL command The display indicates the present condition of the relay either normal or reversed 2 Use the and d amp eys to select either NORM or REV NORMal causes RELAY OFF the relay polarity to be the same as the dc source output REVerse causes the relay polarity to be opposite to that of the dc source output 6 Setting the HP IB Address and RS 232 Parameters Your dc source is shipped with the HP IB address set to 5 This address can only be changed from the front panel using the Address menu located under the Address key This menu is also used to select the RS 232 interface and specify RS 232 parameters such baud rate and parity Set the HP IB address as follows Action Display 1 On the System keypad press Address ADDRESS 5 2 Enter the new address For example Press 7 Enter ADDRESS 7 Configure the RS 232 interface as follows Action Display 1 On the System keypad press Address ADDRESS 5 2 Scroll through the Address menu by pressing q The interface INTF RS232 command lets you select the RS 232 interface The baudrate command BAUDRATE 9600 lets you select the baudrate The parity command lets you select the PARITY EVEN parity The flow command selects the flow control options XON XOFF 3 The an
47. ft 10833D RS 232 cable 34398A 9 pin F to 9 pin F 2 5 meter null modem printer cable with one 9 pin M to 25 pin F adapter RS 232 adapter kit contains 4 adapters 34399A 9 pin M to 25 pin M for pc or printer 9 pin M to 25 pin M for pc or printer 9 pin M to 25 pin M for modem 9 pin M to 9 pin M for modem 18 2 General Information Description Both the HP 66332A Dynamic Measurement DC Source and the HP 6631B 6632B 6633B 6634B System DC Power Supply combine two instruments in one unit It includes a de source which produces dc output with programmable voltage and current amplitude and a highly accurate voltage and current meter with the capability to measure very low level currents Additionally the HP 66332A Dynamic Measurement DC Source has the ability to measure and characterize output voltage and current of pulse or ac waveforms Capabilities Output Voltage and Current control with 12 bit programming resolution Extensive measurement capability dc voltage and current rms and peak voltage and current HP 66332A only 16 bit measurement resolution low range accurate down to 2 microamperes Triggered acquisition of digitized current and voltage waveforms HP 66332A only Front panel control with 14 character vacuum fluorescent display keypad and rotary control for voltage and current settings Built in HP IB and RS 232 interface programming with SCPI command language Non volatile state storage and recal
48. ges to an existing value On the Function keypad press CURR 1 000 Current On the Entry keypad press or to select the digit in the numeric field that you wish to change For example move the flashing digit to the tenths column to change a value in this column Then press to scroll from 0 900 to 1 000 Then press Enter Enable the output 42 Action Display On the Function keypad press Output On Off to enable the output The 8 003V 1 000A Dis annunciator will go off indicating that the voltage is now applied to the output terminals The A display indicates the actual output current Front Panel Operation 5 2 Querying and Clearing Output Protection The dc source will disable its output if it detects an overvoltage or overcurrent fault condition Other automatic fault conditions such as overtemperature also will disable the output Query and clear the dc source overcurrent protection feature as follows Action Display 1 On the Function keypad press Protect In this example OC indicates that OC an overcurrent condition has occurred Other protection indicators are OT overtemperature OV overvoltage RI remote inhibit and FS internal fuse is open CURR 0 2045 2 On the Function keypad press Current This displays the present output 2 amp unit current limit 10 of the maximum rating is the default current limit setting 3 To restore normal operation after the cause of the overcurrent
49. he following parameters may be calibrated voltage programming and measurement overvoltage protection OVP current programming and measurement negative current programming low range measurement ac current measurement ff Oe o o Front Panel Calibration Menu The Entry keypad is used for calibration functions Press this key to access the calibration menu Display Command Function CAL ON lt value gt Turns calibration mode on when the correct password value is entered CAL OFF Turns calibration mode off CAL LEV lt char gt Advance to next step in sequence P1 or P2 CAL DATA lt value gt Enter an external calibration measurement CAL VOLT Begin voltage calibration sequence CAL VOLT PROT Begin voltage protection calibration CAL CURR Begin high range current calibration sequence CAL CURR NEG Begin negative current calibration sequence CAL CURR MEAS LOW Begin low range current measurement calibration CAL CURR MEAS AC Begin ac current calibration sequence CAL SAVE Saves the calibration constants in non volatile memory CAL PASS lt value gt Set new calibration password Notes value a numeric value char a character string parameter Uselo_ and a to scroll through the menu commands Usel __ and to scroll through the menu parameters Usel and U to select a digit in a numeric entry field 59 B Verification and Calibration Front Panel Calibration These procedures assume you understand how to
50. igital Output Ports 0 1 2 Digital Input Port 2 COO O ee gt TTL AS CMOS HC COOO B Diaital Interface Circuits Figure 3 5 Digital I O Examples 29 3 Installation Controller Connections The dc source connects to a controller either through an HP IB or an RS 232 connector HP IB Interface Each dc source has its own HP IB bus address which can be set using the front panel Address key as described in chapter 5 HP IB address data is stored in non volatile memory The dc source is shipped with its HP IB address set to 5 Dc sources may be connected to the HP IB interface in series configuration star configuration or a combination of the two provided the following rules are observed The total number of devices including the controller is no more than 15 The total length of all cables used is no more than 2 meters times the number of devices connected together up to a maximum of 20 meters Refer to table 2 2 for a list of HP IB cables available from Hewlett Packard Do not stack more than three connector blocks together on any HP IB connector Make sure all connectors are fully seated and the lock screws are firmly finger tightened RS 232 Interface The dc source has an RS 232 programming interface which is activated by commands located in the front panel Address menu All SCPI and COMPatibility commands are a
51. increase in output over the programmed value Shorting the sense leads trips the OVP circuit NOTE It is good engineering practice to twist and shield all signal wires to and from the sense connectors Connect the shield at the de source end only Do not use the shield as one of the sensing conductors remove sense jumpers L f _ 240 VDC MAX TO S D twisted or shielded pair LOAD Figure 3 3 Remote Sense Connections The overvoltage protection circuit senses voltage near the output terminals not at the load Therefore the signal sensed by the OVP circuit can be significantly higher than the actual voltage 25 3 Installation at the load When using remote sensing you must program the OVP trip voltage high enough to compensate for the voltage drop between the output terminals and the load Also if the sum of the programmed voltage and the load lead drop exceeds the de source s maximum voltage rating this may also trip the OV protection circuit Stability When the unit is configured for remote sensing it is possible for the impedance of the load wires and the capacitance of the load to form a filter which becomes part of the unit s feedback loop This can degrade the unit s stability and result in poor transient response performance In extreme
52. l Over voltage over current over temperature and RI DFI protection features Extensive selftest status reporting and software calibration ef gt Front Panel Controls The front panel has both rotary RPG and keypad controls for setting the output voltage and current The panel display provides digital readouts of a number of output measurements Annunciators display the operating status of the dc source System keys let you perform system functions such as setting the HP IB address and recalling operating states Front panel Function keys access the dc source function menus Front panel Entry keys let you select and enter parameter values Refer to chapter 5 for a complete description of the front panel controls Remote Programming NOTE When shipped HP 6631B 6632B 6633B 6634B units are set to the Compatibility programming language HP 66332A units are set to the SCPI programming language To change the programming language from Compatibility to SCPI press the front panel Address key use V to scroll to the LANG command press to select SCPI then press Enter Refer to the Programming Guide supplied with your de source for further information about remote programming The dc source may be remotely programmed via the HP IB bus and or from an RS 232 serial port HP IB programming is with SCPI commands Standard Commands for Programmable Instruments which make the de source programs compatible with those of other HP IB i
53. lay circuit or signal other devices whenever a user definable fault occurs Digital I O Connections As shown in Table 3 3 and Figure 3 5 the FLT INH connector can also be configured as a digital TO port Information on programming the digital I O port is found in chapter 5 and under SOURce DIGital DATA and SOURce DIGital FUNCtion commands in the Programming Guide The electrical characteristics of the digital connector are described in appendix A Table 3 3 FLT INH DiGital I O Connector PIN FAULT INHIBIT DIGITAL VO 1 FLT Output Output 0 2 FLT Common Output 1 3 INH Input Input Output 2 4 INH Common Common 28 Installation 3 NOTE Connectors DOOO to 1234 are removable FLT INH INH Input INH Common Switch Normally Open A INH Example with One Unit N INH Input OCOC 1234 m 7 INH Input B FLT Example with Multiple Units Figure 3 4 FLT INH Examples NOTE Connectors are removable 16 5V Max Coil Current 0 25A Max Relay Driver Ports 0 1 2 contains internal clamp diodes for inductive flyback A Relay Circuits D
54. lftest 3 VDAC IDAC selftest 4 OVDAC selftest Digital I O selftest error Device Dependent Errors 100 through 32767 sets Standard Event Status Register bit 3 Ingrd receiver buffer overrun RS 232 receiver framing error RS 232 receiver parity error RS 232 receiver overrun error Front panel uart overrun Front panel uart framing Front panel uart parity Front panel buffer overrun Front panel timeout CAL switch prevents calibration CAL password is incorrect CAL not enabled Computed readback cal constants are incorrect Computed programming cal constants are incorrect Incorrect sequence of calibration commands CV or CC status is incorrect for this command Output mode switch must be in NORMAL position Too many sweep points Command only applies to RS 232 interface CURRent or VOLTage fetch incompatible with last acquisition Measurement overrange 67 D Line Voltage Conversion WARNING Shock Hazard Operating personnel must not remove instrument covers Component replacement and internal adjustments must be made only by qualified service personnel Open the Unit Turn off ac power and disconnect the power cord from the unit e Remove the four screws that secure the cover use a 2 Pozi drive Slightly spread the bottom of the cover and pull it back to remove it from the unit Configure the Power Transformer Locate the ac input wiring harness on the left side of the transformer Use a needlenose pliers and
55. ls Test Setup Figure B 1 shows the setup for the tests Be certain to use load leads of sufficient wire gauge to carry the full output current see chapter 3 53 B Verification and Calibration DC Current DC Load resistor Voltmeter monitor Ampmeter Load Resistor 400 6631B 11K 6632B Sian amp 66332A Fine od 2 5K 6633B a 5K 6634B ala I J DC Load DC i c t A urren Ampmeter resistor Voltmeter monitor C External D External DC supply i DC supply Figure B 1 Verification amp Calibration Test Setup Performing the Verification Tests NOTE The verification procedure can only be performed using the SCPI language commands Use either the front panel Address key to access the LANG command or use the SYSTem LANGuage command to change the programming language to SCPI The following procedures assume you understand how to operate the dc source from the front panel as explained in chapter 5 When performing the verification tests from an HP IB cont
56. lt char gt I Selects language SCPI or COMP value a numeric value char a character string parameter Uselo_ and a to scroll through the command list Usel and to scroll through the parameter list Press to place the dc source into a previously stored state You can recall up to 4 0 through 3 previously stored states Press to display the system error codes stored in the SCPI error queue This action also clears the queue If there is no error in the queue 0 is displayed Press to store an existing dc source state in non volatile memory The parameters saved are listed under SAV in the dc source Programming Guide You can save up to 4 states 0 through 3 37 5 Front Panel Operation Function Keys Refer to the examples later in this chapter for more details on the use of these keys FUNCTION Input Prot Clear Figure 5 3 Function Keys Immediate Action Keys Immediate action keys immediately execute their corresponding function when pressed Other function keys have commands underneath them that are accessed when the key is pressed rhe This key toggles the output of the dc source between the on and off states It immediately executes its function as soon as you press it When off the dc source output is disabled and the Dis annunciator is on Press this key to reset the protection circuit and allow the unit to return to its last programmed state The condition that caused the protection circuit to bec
57. mmands is used to shut down the power supply output whenever the INH is pulled low with respect to INH chassis referenced common The connector accepts wires sizes from AWG 22 to AWG 12 Disconnect the mating plug to make your wire connections NOTE It is good engineering practice to twist and shield all signal wires to and from the digital connectors If shielded wire is used connect only one end of the shield to chassis ground to prevent ground loops Figure 3 4 shows how you can connect the FLT INH circuits of the dc source In example A the INH input connects to a switch that shorts the Inhibit pin to common whenever it is necessary to disable output of the unit This activates the remote inhibit RD circuit which turns off the dc output The front panel Prot annunciator comes on and the RI bit is set in the Questionable Status Event register To re enable the unit first open the connection between pins INH and common and then clear the protection circuit This can be done either from the front panel or over the HP IB RS 232 In example B the FLT output of one unit is connected to the INH input of another unit A fault condition in one of the units will disable all of them without intervention either by the controller or external circuitry The controller can be made aware of the fault via a service request SRQ generated by the Questionable Status summary bit Note that the FLT output can also be used to drive an external re
58. nal adjustments must be made only by qualified service personnel Instruments that appear damaged or defective should be made inoperative and secured against unintended operation until they can be repaired by qualified service personnel SAFETY SYMBOLS WARNING Caution Direct current Alternating current Both direct and alternating current Three phase alternating current Earth ground terminal Protective earth ground terminal Frame or chassis terminal Terminal is at earth potential Used for measurement and control circuits designed to be operated with one terminal at earth potential Terminal for Neutral conductor on permanently installed equipment Terminal for Line conductor on permanently installed equipment On supply Off supply Standby supply Units with this symbol are not completely disconnected from ac mains when this switch is off To completely disconnect the unit from ac mains either disconnect the power cord or have a qualified electrician install an external switch In position of a bi stable push control Out position of a bi stable push control Caution risk of electric shock Caution hot surface Caution refer to accompanying documents The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in personal injury Do not proceed beyond a WARNING sign until the indicated conditions are
59. nce to convert the value to amperes Record this value and the current reading on the front panel display Current Measurement Low Range Action Turn off the dc source and connect it as shown in figure B 1B with the 400 ohm load resistor Set the DMM to operate in current mode Turn on the dc source access the Input menu and set the current range to LOW Set the output voltage to 0 V and the current to its full scale value see table B 2 Press Output On Off to enable the output Record the current reading from the DMM as well as from the front panel display Enter the difference between the two readings in the appropriate table Set the output voltage to 8 volts Record the current reading from the DMM as well as from the front panel display Enter the difference between the two readings in the table Current Sink Measurement 13 20 56 Action Turn off the dc source and connect an external supply to the output of the unit as shown in figure B 1C using a 400 ohm load resistor Set the DMM to operate in current mode Turn on the dc source access the Input menu and set the current range to LOW Access the Input menu and set the current sense detector to DC Turn on the external supply and program its output for 8 volts and 1 A Program the dc source to 0 V and 1 A Press Output On Off to enable the output Record the current reading from the DMM as well as from the front panel display Enter the
60. nstallation sheet and on line help NOTE The driver must be installed on your computer to access the on line information Drivers for HP UX are available on the web at www hp com go power 17 2 General Information Safety Considerations This dc source is a Safety Class 1 instrument which means it has a protective earth terminal That terminal must be connected to earth ground through a power source equipped with a ground receptacle Refer to the Safety Summary page at the beginning of this guide for general safety information Before installation or operation check the dc source and review this guide for safety warnings and instructions Safety warnings for specific procedures are located at appropriate places in the guide Options and Accessories Table 2 1 Options Description 87 106 Vac 47 63 Hz 191 233 Vac 47 63 Hz 207 253 Vac 47 63 Hz Front panel output binding posts Isolation and polarity reversal relays not available on HP 6631B Rack mount kit HP p n 5062 3974 Rack mount kit with handles HP p n 5062 3975 Accessory Rack slide kit HP p n 1494 0060 Service manual with extra operating manuals Support rails are required when rack mounting units Use E3663A support rails for HP rack cabinets and E3664A for non HP rack cabinets Table 2 2 Accessories HP Part Number HP IB cables 1 0 meter 3 3 ft 10833A 2 0 meters 6 6 ft 10833B 4 0 meters 13 2 ft 10833C 0 5 meters 1 6
61. nstruments Compatibility commands are also included to make the dc source compatible with 19 2 General Information the HP 6632A 6633A and 6634A Series dc power supplies refer to appendix D in the the Programming Guide Dc source status registers allow remote monitoring of a wide variety of dc source operating conditions Output Characteristic The dc source s output characteristic is shown in the following figure The output of the dc source may be adjusted to any value within the boundaries shown Output Voltage CV operating line Vmax J P 9 d VSET 1 CC operating line Fi F L Output Imax ISET 0 ISET Imax Current Figure 2 1 Dc Source Output Characteristic The dc source can operate in either constant voltage CV or constant current CC over the rated output voltage and current Although the dc source can operate in either mode it is designed as a constant voltage source This means that the unit turns on in constant voltage mode with the output voltage rising to its Vset value There is no command for constant current operation The only way to turn the unit on in constant current mode is by placing a short across the output and then enabling or turning the output on Note that the dc source cannot be programmed to operate in a specific mode After initial turn on the operating mode of the unit will be determined by the voltage setting the current setting and the
62. nt or decrement a specific digit in the entry field using the and okeys or the RPG knob 0 through 9 are used for entering numeric values is the decimal point is the minus sign For example to enter 33 6 press Enter Number 3 3 6 Enter The backspace key deletes the last digit entered from the keypad This key lets you correct one or more wrong digits before they are entered This key aborts a keypad entry by clearing the value This key is convenient for correcting a wrong value or aborting a value entry The display then returns to the previously set function This key executes the entered value or parameter of the presently accessed command Until you press this key the parameters you enter with the other Entry keys are displayed but not entered into the dc source Before pressing Enter you can change or abort anything previously entered into the display After Enter is pressed the dc source returns to Meter mode 41 5 Front Panel Operation Examples of Front Panel Programming You will find these examples on the following pages NYDN FWN KE Setting the output voltage and current Querying and clearing output protection Making front panel measurements Programming the digital port Programming the output relay Option 760 only Setting the HP IB address or RS 232 parameters Saving and recalling operating states Similar examples are given in the dc source Programming Guide using SCPI commands 1
63. ntact your nearest HP Sales and Support Office refer to the list at the back of this guide to obtain the correct cord Output Connections The output terminal block has connections for the and output the and sense inputs and an earth ground terminal The terminal block screws are 6 32 X 3 8 inch Remove the safety cover by inserting a flat bladed screwdriver in the opening on the left side of the cover and pushing the locking tab to the left This will release the cover Optional front panel binding posts are available to connect load wires for bench operation The front panel binding posts are paralleled with the rear panel and connections Before using the front panel binding posts make sure that the output terminals are jumpered for local sensing NOTE Front panel binding posts are provided for convenience Only the rear panel terminals are optimized for noise regulation and transient response as documented in Appendix A Wire Considerations To minimize the possibility of instability on the output keep load leads as short as possible bundle or twist the leads tightly together to minimize inductance Current Ratings Fire Hazard To satisfy safety requirements load wires must be large enough not to overheat when carrying the maximum short circuit current of the dc source If there is more than one load then any pair of load wires must be capable of safely carrying the full rated current of the de source
64. ny The information contained in this document is subject to change without notice Copyright 1997 Hewlett Packard Company Edition 1 November 1997 Table of Contents Warranty Information Safety Summary Acoustic Noise Information Printing History Table of Contents QUICK REFERENCE HP 66332A Dynamic Measurement DC Source and HP 6611C 6614C System DC Power Supply The Front Panel At a Glance Front Panel Number Entry Front Panel Annunciators Immediate Action Keys Front Panel Menus At a Glance SCPI Programming Commands At a Glance The Rear Panel At a Glance GENERAL INFORMATION Document Orientation Safety Considerations Options and Accessories Description Capabilities Front Panel Controls Remote Programming Output Characteristic INSTALLATION Inspection Damage Packaging Material Items Supplied Cleaning Location Bench Operation Rack Mounting Input Connections Connect the Power Cord Output Connections Wire Considerations Current Ratings Voltage Drops Multiple Load Connections Remote Sense Connections Sense Leads Stability OVP Considerations Fast Normal Operation Inductive Loading Capacitive Loading INH FLT Connections Controller Connections HP IB Interface RS 232 Interface TURN ON CHECKOUT Introduction Using the Keypad Checkout Procedure In Case of Trouble Error Messages Line Fuse FRONT PANEL OPERATION Introduction Front Panel Description System Keys Function Keys Immediate Action Keys
65. ome active must be removed prior to pressing this key or the unit will shut down again and display the Prot annunciator again If FS protection is displayed on the front panel the unit must be opened and an internal fuse replaced as described in the Service manual Press this key to toggle between OCP enabled and disabled If OCP is enabled the output will become disabled if the output mode changes from CV to CC mode The OCP annunciator indicates the state of OCP Scrolling Keys Scrolling keys let you move through the commands in the presently selected function menu Press _ to bring up the next command in the list Press e to go back to the previous command in the list Function menus are circular you can return to the starting position by continuously pressing either key The following example shows the commands in the Input function menu a CURR RANGE lt char gt a CURR DET lt char gt 38 Front Panel Operation 5 Metering Keys Metering keys control the metering functions of the dc source When the unit is operating in front panel meter mode all front panel measurements are calculated from a total of 2048 readings taken at a 46 8 microsecond sampling rate Therefore the total acquisition time for a single front panel measurement is about 100 milliseconds Refer to Making Front Panel Measurements for more information NOTE You can vary the both the sampling rate and the number of data points in each
66. on Voltage Programming and Measurement Low Voltage Vou V 5 mV Front Panel measurement Vout 2 mV mV Vout 2 mV High Voltage Vou 8 991 V 8 009 V Low Curenta ma High Current owa Front Panel measurement Current Measurement Low Range Low Current measurement High Current measurement Current Sink Measurement Low Current Sink measurement High Current Sink measurement Table B 4 Verification Test Record for HP 66332A or HP 6632B Model HP Report No Date Test Description Maximum Specification Specification Voltage Programming and Measurement Low Voltage Vou Front Panel measurement pv High Voltage Vou 19 980 V Front Panel measurement Current Programming and Measurement High Range 20 020 V Low Current La ama ooa i High Current Lout 4 9955 A 5 0045 A mA Front Panel measurement Current Measurement Low Range Low Current measurement High Current measurement Current Sink Measurement Low Current Sink measurement High Current Sink measurement 57 B Verification and Calibration Table B 5 Verification Test Record for HP 6633B Model HP 6633B Report No Date Test Description Minimum Recorded Results Maximum Specification Specification Voltage Programming and Measurement Low Voltage Vou V 20 mV Front Panel measurement Vout 6 MV mV Vout 6 mV High Voltage Vou 49 955 V 50 045 V Low Currents ta High Current g Front Panel measurement Current Measurement Low Range
67. operate front panel keys see chapter 5 Enable Calibration Mode Action Reset the unit by selecting Output scrolling to RST and pressing Enter Press Output On Off to enable the output To begin calibration press Shift Cal scroll to CAL ON and press Enter Enter the calibration password from Entry keypad and press Enter If the password is correct the Cal annunciator will come on If CAL DENIED appears then an internal switch has been set to prevent the calibration from being changed See the Service Manual If the password is incorrect an error occurs If the active password is lost the calibration function can be recovered by setting an internal switch that defeats password protection See the Service Manual Voltage Programming and Measurement Calibration 10 Action Connect the DMM dc volts mode directly to the de source Do not connect the load resistor or current shunt Press Shift Cal scroll to CAL VOLT and press Enter Press Shift Cal scroll to CAL LEV and press Enter to select the first calibration point Press Shift Cal scroll to CAL DATA and use the Entry keypad to enter the voltage value displayed on the DMM Press Shift Cal scroll to CAL LEV use do scroll to P2 the second calibration point and press Enter Press Shift Cal scroll to CAL DATA and use the Entry keypad to enter the second voltage value displayed on the DMM Overvoltage Protection Calibration 11 12 60
68. or as shown in figure B 1C Set the DMM to operate in current mode Set the negative supply to the full scale voltage rating of the UUT Press Shift Cal scroll to CAL CURR NEG and press Enter Wait for the dc source to compute the negative current calibration constant The display returns to Meter mode when the calculation is complete Low Range Current Measurement Calibration 22 23 24 25 Action Press Shift Cal scroll to CAL CURR MEAS LOW and press Enter Connect the UUT as shown in figure B 1B with the appropriate load resistor for your model Set the DMM to operate in current mode Press Shift Cal scroll to CAL LEV and press Enter to select the first calibration point Press Shift Cal and scroll to CAL DATA Wait for the DMM reading to stabilize Then use the Entry keypad and enter the current reading displayed on the DMM Display CAL CURR CAL LEV P1 CAL DATA 0 00 CAL LEV P2 CAL DATA 0 00 Display CAL CURR NEG Display CAL CURR MEAS LOW CAL LEV P1 CAL DATA 0 00 61 B Verification and Calibration AC Current Measurement Calibration HP 66332A only Action Display 26 Disconnect all loads from the dc source Make sure the mode switch on the rear panel is set to Normal 27 Press Shift Cal scroll to CAL CURR MEAS AC and press Enter CAL CURR MEAS AC 28 Wait for the dc source to compute the ac current calibration constant The display returns to Meter mode when the calc
69. output current to full scale see table B 2 Output current near 0 A Press Output On Off to enable the output 3 Record voltage readings at the DMM and on the front panel Readings within low voltage display in the appropriate table limits see table B 3 4 5 or 6 4 Set the output voltage to the full scale rated voltage Output voltage near full scale see Table B 2 5 Record voltage readings at the DMM and on the front panel Readings within high voltage display in the table limits see table B 3 4 5 or 6 Current Programming and Measurement Accuracy This test verifies the current programming and measurement Connect the appropriate current monitor see table B 1 as shown in figure B 1A Current Programming and Measurement High Range Action Normal Result 1 Turn off the dc source and connect the DMM and current monitor as shown in figure B 1A 2 Turn on the dc source access the Input menu and set the current CURR DET DC sense detector to DC 3 Set the output voltage to 5 V and the current to 0 A Press Output current near 0 A Output On Off to enable the output 4 Divide the voltage drop across the current monitor by its Readings within low current resistance to convert the value to amperes Record the value limits see table B 3 4 5 or 6 55 B Verification and Calibration Set the output current to its full scale value see Table B 2 Divide the voltage drop across the current monitor by its resista
70. panel output connectors HENLEN As 0 20V f 02A PA PACKARD Dyn lc Measurement DC Source SYSTEM HN FUNCTIONS EA ENTRY SER se AE OUTPY Te To a a Ip JEJE JEDEN FAARAREREY ev ce Unt De OCP Prot Cal SAM Rmi Add Err SRG amp iy JEJE Jie f J fe vals h ED ED ED ee Jt J Gai LA fer te the dc source a System keys Function keys on and off e return to Local enable disable mode output set the HP IB select metering address functions set the RS 232 program voltage interface and current display SCPI set and clear error codes protection save and recall functions and scroll through the front panel menu commands instrument states 10 Entry keys enter values increment or decrement values 0 and select front panel menu parameters J and select a digit in the numeric entry field 1 Quick Reference Front Panel Number Entry Enter numbers from the front panel using one of the following methods Use the arrow keys and knob to change voltage or current settings NOTE The output must be ON to see the displayed values change in Meter mode AND Increments the flashing digit Moves the flashing digit to the right Decrements the flashing digit Moves the flashing digit to the lef
71. ranty information is printed in the front of this guide Packaging Material Until you have checked out the dc source save the shipping carton and packing materials in case the unit has to be returned If you return the dc source for service attach a tag identifying the model number and the owner Also include a brief description of the problem Items Supplied The following user replaceable items are included with your dc source Some of these items are installed in the unit Table 3 1 Items Supplied Item Part Number Power Cord contact nearest A power cord appropriate for your location HP Sales and Support Office 1252 1488A 4 terminal digital plug that connects to the back of the unit 06624 20007 Safety cover that installs over the output screw terminals Terminal block screws 6 32 X 3 8 inch screws Line Fuse 2110 0055 4 A for 100 120 Vac operation 2110 0002 2 A for 220 230 Vac operation 5041 8801 feet for bench mounting 5962 8196 Contains installation checkout and front panel information Programming Guide 5962 8198 Contains detailed HP IB programming information Cleaning Use a dry cloth or one slightly dampened with water to clean the external case parts Do not attempt to clean internally WARNING _ To prevent electric shock unplug the unit before cleaning 21 3 Installation Location The outline diagram in figure 3 1 gives the dimensions of your de source The de source must be installed in
72. rating time of digital wireless communications products The HP 6631B 6632B 6633B 6634B are 100 Watt high performance dc power supplies with output current measurement capability in the microampere range They are well suited for testing portable battery powered products Additionally the combination of bench top and system features in these dc sources provide versatile solutions for your design and test requirements Convenient bench top features Upto 100 Watts output power Easy to use knob for voltage and current settings Highly visible vacuum fluorescent front panel display Excellent load and line regulation low ripple and noise Measurement capability down to microampere levels Current sinking up to the maximum rated output current Instrument state storage e Portable case Flexible system features HP IB EEE 488 and RS 232 interfaces are standard SCPI Standard Commands for Programmable Instruments compatibility Triggered acquisition of digitized output current and voltage waveforms HP 66332A only I O setup easily done from the front panel 1 Quick Reference The Front Panel At a Glance Rotary control sets voltage current and menu parameters Use a and C to set the resolution then adjust the value with the knob 4 Annunciators indicate operating modes and status conditions 14 character display shows output measurements and programmed values Y Optional front
73. roller you may have to consider the relatively slow settling times and slew rates of the dc source as compared to computer and system voltmeters Suitable WAIT statements can be inserted into the test program to give the dc source time to respond to the test commands Perform the following tests for operation verification in the order indicated 1 Turn On Checkout 2 Voltage Programming and Measurement Accuracy 3 Current Programming and Measurement Accuracy 54 Verification and Calibration B Table B 2 Verification Programming Values Fil scale Voltage Full Scale Current 6631B po 8e 0o 10238 6632B 66332A 5 1188 6633B 2 0475 6634B 1 0238 Turn On Checkout Perform the Turn On Checkout as directed in chapter 4 NOTE The dc source must pass turn on selftest before you can proceed with the verification tests Voltage Programming and Measurement Accuracy This test verifies the voltage programming HP IB measurement and front panel meter functions Values read back over the HP IB should be the same as those displayed on the front panel Measure the dc output voltage at the output terminals Make sure the output mode switch is set to Normal and the sense terminals are directly jumpered to the output terminals Action Normal Result 1 Turn off the dc source and connect a DMM to the output terminals 2 Turn on the dc source with no load on the output Set the output Output voltage near 0 V voltage to 0 V and the
74. s in constant voltage mode CC The dc source output is in constant current mode Unr The dc source output is in an unregulated state Dis The dc source output is disabled off OCP The overcurrent protection state is enabled Prot One of the dc source s output protection features is activated Cal The dc source is in calibration mode Shift The Shift key is pressed to access an alternate key function Rmt The selected interface HP IB or RS 232 is in a remote state Addr The interface is addressed to talk or to listen Err There is a message in the SCPI error queue SRQ The interface is requesting service from the controller The rotary control lets you set the output voltage or current as well as menu parameters Press and to select the resolution then adjust the value with the knob Optional front panel binding posts let you connect loads to the front of the unit Before using the front panel binding posts make sure that the output terminals are jumpered for Local sensing This turns the dc source on or off The system keys let you Return to Local mode front panel control Set the dc source HP IB address Set the RS 232 interface communication baud rate and parity bit Display SCPI error codes and clear the error queue Save and recall up to 4 instrument operating configurations Function access command menus that let you Enable or disable the output Select metering functions Program output voltage and current Display th
75. s manual The following documents are shipped with your dc source e a User s Guide this document contains installation checkout and front panel information a Programming Guide contains detailed HP IB programming information an HP VXIplug amp play instrument driver for Windows 95 and Windows NT 4 0 The following Getting Started Map will help you find the information you need to complete the specific task that you want to accomplish Refer to the table of contents or index of each guide for a complete list of the information contained within Getting Started Map Task Where to find information Installing the unit Line voltage connections Computer connections Load connections User s Guide Checking out the unit Verifying proper operation Using the front panel Calibrating the unit User s Guide Using the front panel Front panel keys Front panel examples User s Guide Using the programming interface HP IB interface RS 232 interface User s Guide Programming Guide Programming the unit using SCPI and Compatibility commands SCPI commands SCPI programming examples Compatibility language Programming Guide Programming the unit using the HP VXIplug amp play instrument driver Installing the instrument driver Instrument driver functions C C example programs Visual BASIC example programs LabVIEW example programs HP VEE example programs HP VXIplug amp play i
76. ss the Shift key followed by the Error key to see the error number See table 4 2 at the end of this chapter NOTE 2 Check that the dc source fan is on 3 Press Voltage VOLT 0 000 lt 2 0 gt Enter VOLT lt 20 gt 4 Press Output On Off lt 20 003V gt 0 0006A 5 Press Shift OV VOLT PROT lt 22 00 gt 32 You should be able to hear the fan and feel the air coming from the back of the unit Programs the output to the selected voltage After the value is entered the display returns to Meter mode Because the output has not been enabled the meter still indicates O volts Turns the output on The Dis annunciator should be off and CV should be on Display shows the overvoltage protection trip voltage for your unit 10 11 12 Procedure Press 5 Enter Press Shift OV lt 2 2 gt Enter Press Shift Prot Clear Press Output on off Connect a jumper wire across the and output terminals Press Output on off Press Current lt 5 gt Enter Press Shift OCP Press Shift OCP Press Shift Prot Clear Turn the unit off and remove the shorting wire from the output terminals Display VOLT PROT 5 0 449V 0 145A VOLT PROT lt 22 gt lt 20 003V gt 0 0034A 0 0005V lt 0 5005 gt A 0 0452V lt 5 002 gt A 0 0005V_ 0 0003A 0 0005V_ 0 0003A 0 0452V lt 5 002A gt Turn On Checkout 4 Explanation Programs the OVP to 5 volts which is less than the previousl
77. t Enters the value when editing is complete Use the Function keys and Entry keys to enter a new value NOTE If you make a mistake use the Backspace key to delete the number or press the Meter key to return to meter mode 7 8 9 4 5 6 Enter AND AND 1 2 3 0 Te 11 1 Quick Reference Front Panel Annunciators A A Oo A A cv cc Unr Dis OCP Prot Cal Shift Rmt Addr Err SRQ The output is operating in constant voltage mode The output is operating in constant current mode The output is unregulated The output is OFF Press the Output On Off key to turn the output on The over current protection state is ON Press the OCP key to turn over current protection off Indicates that the output has been disabled by one of the protection features Press the Prot Clear key to clear the protection condition Calibration mode is ON Scroll to the Cal Off command and press the Enter key to exit the calibration mode The Shift key has been pressed The selected Remote programming interface either HP IB or RS 232 is active Press the Local key to return the unit to front panel control The interface is addressed to talk or listen There is an error in the SCPI error queue Press the Error key to view the error code The interface is requesting servi
78. t also lists the device dependent errors Information inside the brackets is not part of the standard error message but is included for clarification When errors occur the Standard Event Status register records them in bit 2 3 4 or 5 as described in the following table Table C 1 Error Numbers Error Error String Description Explanation Examples Number Command Errors 100 through 199 sets Standard Event Status Register bit 5 Command error generic Invalid character Syntax error unrecognized command or data type Invalid separator Data type error e g numeric or string expected got block data GET not allowed Parameter not allowed too many parameters Missing parameter too few parameters Program mnemonic too long maximum 12 characters Undefined header operation not allowed for this device Invalid character in number includes 9 in octal data etc Numeric overflow exponent too large exponent magnitude gt 32 k Too many digits number too long more than 255 digits received Numeric data not allowed 65 C Error Messages 66 Invalid suffix unrecognized units or units not appropriate Suffix not allowed Invalid character data bad character or unrecognized Character data too long Character data not allowed String data error Invalid string data e g END received before close quote String data not allowed Block data error Invalid block data e g END received before
79. tage Current 2mA 1mA 1mA 1mA or current for any load change within ratings Line Regulation Voltage 0 5 mV 0 5 mV 1mV 1 mV change in output voltage Current 1 mA 0 5 mA 0 25 mA 0 25 mA or current for any line change within ratings Transient Response Normal mode lt 100 us Time Fast mode lt 50 us for the output voltage to recover to its previous level within 0 1 of the voltage rating of the unit or 20 mV following a change in load current of up to 50 of the output current rating This specification may degrade slightly when the unit is subjected to an RF field 23 V meter Applies in SCPI mode with current detector set to DC With current detector set to ACDC accuracy is 0 2 four times the fixed error value In COMPatibility mode accuracy is 0 2 six times the fixed error value For HP 6631B 6632B and 66332A from 1 MHz to 20 MHz 0 3mV 15mV For HP 6633B and 6634B from 1 MHz to 20 MHz 0 5mV 15mV Applies at rear terminals with unit set to remote sensing and with sense terminals externally jumpered to their respective output terminals A Specifications Supplemental Characteristics Table A 2 lists the supplemental characteristics which are not warranted but are descriptions of typical performance determined either by design or type testing Table A 2 Supplemental Characteristics Parameter HP 6631B HP 6632B HP 6633B HP 6634B HP 66332A Input Ratings 100 Vac mains 87 106 Vac 47 63
80. ter to activate autoranging Two other selections are also available Select the High range when measuring currents above 20 mA Select the Low range for improved resolution when measuring currents below 20 mA For output waveform measurements press Shift Input Then press q CURR DET ACDC until you obtain the CURR DET command Check to make sure that the ACDC current detector is selected This provides the best accuracy for waveform measurements Only select the DC current detector if you are making dc current measurements and you require a dc measurement offset better than 1mA on the High current measurement range In the Low current measurement range the current detector is fixed at DC With the current detector in dc accurate current measurements cannot be made on waveforms with frequency contents over a few kHz 3 On the Function keypad press Meter and press q repeatedly to access the following measurement parameters dc voltage and current peak voltage minimum voltage high level of a voltage pulse waveform low level of a voltage pulse waveform rms voltage peak current minimum current high level of a current pulse waveform low level of a current pulse waveform rms current HP 66332A only effete HTH HH OH SO 44 lt reading gt V lt reading gt A lt reading gt V MAX lt reading gt V MIN lt reading gt V HIGH lt reading gt V LOW lt reading gt V RMS lt reading gt A MAX lt reading gt A M
81. ulation is complete Saving the Calibration Constants WARNING Storing calibration constants overwrites the existing ones in non volatile memory If you are not sure you want to permanently store the new constants omit this step The dc source calibration will then remain unchanged Action Display 29 Press Shift Cal scroll to CAL SAVE and press Enter CAL SAVE 30 Press Shift Cal select CAL OFF and press Enter to exit CAL OFF Calibration mode RST and RCL will also set the calibration state to OFF Calibration Error Messages Errors that can occur during calibration are shown in the following table Table B 7 HP IB Calibration Error Messages Meaning CAL switch prevents calibration This is a hardware disable see the Service Manual CAL password is incorrect CAL not enabled Computed readback cal constants are incorrect Computed programming cal constants are incorrect Incorrect sequence of calibration commands 62 Verification and Calibration B Changing the Calibration Password The factory default password is 0 You can change the password when the dc source is in calibration mode which requires you to enter the existing password Proceed as follows Action Display 1 Begin by pressing Shift Cal and scrolling to the CAL ON command CAL ON 0 0 Enter the existing password from Entry keypad and press Enter Press Shift Cal and scroll to the CAL PASS command CAL PASS 0 a a Enter the new password from the
82. umstances Sense either at the remote distribution terminals or if one load is more sensitive than the others sense directly at the critical load M _ 240 VDC MAX TO 1 S S EEE lO Q 4 twist or bundle each pair Figure 3 2 Multiple Load Connections Remote Sense Connections 24 Installation 3 Under normal operation the dc source senses the output voltage at the output terminals on the back of the unit External sense terminals are available on the back of the unit that allow the output voltages to be sensed at the load compensating for impedance losses in the load wiring You cannot remote sense at the optional front panel binding posts The output terminal block of the unit is shipped configured for local sensing with the S terminal jumpered to and the S terminal jumpered to Remove these jumpers when making your sense wire connections The terminal block screws are 6 32 X 3 8 inch Sense Leads The sense leads are part of the dc source s feedback path and must be kept at a low resistance less than several ohms to maintain optimal performance Connect the sense leads carefully so that they do not become open circuited If the sense leads are left unconnected or become open during operation the dc source will regulate at the output terminals resulting in a 3 to 5
83. vailable through RS 232 programming When the RS 232 interface is selected the HP IB interface is disabled The RS 232 connector is a DB 9 male connector Adapters are available to connect the de source to any computer or terminal with a properly configured DB 25 connector see Table 2 2 12345 coco000 O 0000 po 6789 Figure 3 5 RS 232 Connector Pin Input Output Description 1 no connection 2 Input Receive Data RxD 3 Output Transmit Data TxD 4 Output Data Terminal Ready DTR 5 Common Signal ground 6 Input Data Set Ready DSR 7 Output Request to Send RQS 8 Input Clear to Send CTS 9 no connection 30 Turn On Checkout Introduction Successful tests in this chapter provide a high degree of confidence that the dc source is operating properly For verification tests see appendix B Complete performance tests are given in the Service Guide NOTE This chapter provides a preliminary introduction to the dc source front panel See chapter 5 for more details Using the Keypad J shitty P Jaa C ana CJaal Some of the front panel keys perform two functions one labeled in black and the other in blue You access the blue function by first pressing th shift key Release the key after you press it The Shift annunciator will be on indicating that you have access to any key s shifted function These keys let you scroll up and down through the choices in the presently selected function
84. voltage drops 24 location 22 M making measurements 43 manuals 21 measurement ranges 43 multiple loads 24 N non volatile memory clearing 47 storing 37 40 normal mode 27 OC 43 72 operating features 19 option 760 46 options 18 OT 43 output characteristic 20 connections 23 connector 21 control keys 40 current setting 42 enable 42 rating 20 voltage setting 42 output relay 46 OV 42 OVLD 34 42 OVP capacitor discharge limit 26 circuit 26 p power cord 21 23 power receptacle 18 preliminary checkout 31 print date 6 protection FS 43 OC 43 OT 43 OV 43 RI 43 Q query protection 43 R rack mount kit 18 rack mounting 22 rear panel connections 28 30 recalling operating states 47 remote programming 19 remote sensing 25 stability 26 repacking 21 RI 43 signal 28 RIDFI 45 RS 232 46 connections 30 interface 30 safety class 18 safety warning 18 saving operating states 47 selftest errors 34 sense connections 25 service guide 18 setting voltage current 42 shift annunciator 31 shift key 31 shorting switch 28 specifications 49 stability with remote sensing 26 supplemental characteristics 50 system errors 65 system keys 37 Address 37 Error 37 Interface 37 Local 37 RCL 37 Save 37 Shift 37 Index T turn on checkout 31 55 av verification current measurement
85. y set output voltage Because the OVP voltage entered was less than the output voltage the OVP circuit tripped The output dropped to zero CV turned off and Prot turned on Programs the OVP to a value greater than the output voltage setting of the unit This prevents the OV circuit from tripping again when the protection condition is cleared Clears the protection condition thus restoring the output of the unit Prot turns off and CV turns on Turn the output off Shorts the output of the unit The CC annunciator is on indicating that the unit is in constant current mode The unit is sourcing output current at 10 of the maximum rating the default output current limit setting Programs the output current to the selected amperes You enabled the overcurrent protection circuit The circuit then tripped because the unit was operating in constant current mode The CC annunciator turns off and the OCP and Prot annunciators come on You have disabled the overcurrent protection circuit The OCP annunciator turns off Restores the output The Prot annunciator turns off CC is on The next time the unit turns on it will be restored to the RST or factory default state 33 4 Turn On Checkout In Case of Trouble Error Messages De source failure may occur during power on selftest or during operation In either case the display may show an error message that indicates the reason for the failure Selftest Errors
86. your normal testing procedure as this may lead to long term failure of some components 26 Installation 3 Fast Normal Operation A switch on the rear of the unit lets you switch between operating in either Fast mode or Normal mode When set to Fast mode this switch disconnects the output capacitor that is located inside the unit Fast mode lets you improve or enhance certain operating characteristics while at the same time degrading other operating characteristics 1 In Fast mode the programming time for voltage programming is faster than for normal operation however output noise is greater 2 In Fast mode the absence of the internal output capacitor results in increased output impedance and therefore greater stability when driving inductive loads Conversely the addition of external capacitive loads in Fast mode will reduce the stability of the unit during constant voltage operation 3 In Normal mode the internal output capacitor helps control peak voltage excursions away from the the nominal value for sudden changes in load current In Fast mode larger peak voltage excursions will show up at the output of the unit during sudden load current changes Capacitive Loading In Normal mode the dc source will be stable for many load capacitances however large load capacitances may cause ringing in the dc source s transient response If this occurs the problem may be solved by increasing or decreasing the total load capacit

HP 6631B User's Manual

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