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Agilent Technologies E3632A User's Manual

1. S enn L l 00000 1 15V 7A range selection key 8 Error Calibrate key 2 30V 4A range selection key 9 I O Configuration Secure key 3 Overvoltage protection key 10 Output On Off key 4 Overcurrent protection key 11 Control knob 5 Display limit key 12 Resolution selection keys 6 Recall operating state key 13 Voltage current adjust selection key 7 Store operating state Local key 10 11 12 13 15V 7A range selection key Selects the 15V 7A range and allows the full rated output to 15V 7A 30V 4A range selection key Selects the 30V 4A range and allows the full rated output to 30V 4A Overvoltage protection key Enables or disables the overvoltage protection function sets trip voltage level and clears the overvoltage condition Overcurrent protection key Enables or disables the overcurrent protection function sets trip current level and clears the overcurrent condition Display limit key Shows voltage and current limit values on the display and allows knob adjustment for setting limit values Recall operating state key Recalls a previously stored operating state from location a ier Oe or se ade Store operating state Local key Stores an operating state in location 1 2 or 3 or returns the power supply to local mode from remote interface mode Error Calibrate key Displays error codes generat
2. 74 Chapter 4 Remote Interface Reference SCPI Command Summary Triggering Commands INITiate IMMediate TRIGger SEQuence DELay lt seconds gt MIN MAX DELay SOURce BUS IMM SOURCe TRG System Related Commands DISPlay WINDow STATe OFF ON STATe TEXT DATA lt quoted string gt TEXT DATA TEXT CLEar sysTem BEEPer IMMediate ERRor VERSion OUTPut RELay STATe OFF ON RELay STATe STATe OFF ON STATe IDN RST TST SAV 1 2 3 RCL 1 2 3 75 Chapter 4 Remote Interface Reference SCPI Command Summary Calibration Commands CALibration COUNt CURRent DATA lt numeric value gt CURRent LEVel MIN MID MAX CURRent PROTection DAC ERRor S S S ECure CODE lt new code gt ECure STATe OFF ON lt code gt ECure STATe STRing lt quoted string gt STRing VOLTage DATA lt numeric value gt VOLTage LEVel MIN MID MAX VOLTage PROTection Status Reporting Commands STATus QUEStionable CONDition EVENt ENABle lt enable value gt ENABle SYSTem ERRor CLS ESE lt enable value gt kE S E ESR OPC OPC PSC 0 1 ZPSC SRE lt enable value gt SRE STB WAL 76 Chapter 4 Remote Interface Reference SCPI Command Summary
3. E NEW Eour E E our TF PSIR FALL TIME R CoLOGe E i is 2 ASYMPTOTIC LEVEL 0 e e i EQUIVALENT CIRCUIT Sepma t2 NEW Eoyr IS ACHIEVED FOR t lt t lt t2 Trsce t NEW Eour IS PROGRAMMED Figure 7 9 Speed of Response Programming Down Figure 7 9 shows that when the power supply is programmed down the regulator senses that the output voltage is higher than desired and turns off the series transistors entirely Since the control circuit can in no way cause the series regulator transistors to conduct backwards the output capacitor can only be discharged through the load resistor and internal current source Ig The output voltage decays linearly with slope of Ig Co with no load and stops falling when it reaches the new output voltage which has been demanded If full load is connected the output voltage will fall exponentially faster Since up programming speed is aided by the conduction of the series regulating transistor while down programming normally has no active element aiding in the discharge of the output capacitor laboratory power supplies normally program upward more rapidly than downward 153 Chapter 7 Tutorial Reliability Reliability Reliability of electronic semiconductor equipment depends heavily on the temperature of the components The lower the temperature of the components the better the reliability The Agilent E3632A incorporate circuitry to reduce the internal power dissipa
4. The power supply is shipped with a detachable 3 wire grounding type power cord The ac line fuse is an extractor type on the rear panel The power supply can be calibrated from the front panel directly or with a controller over the GPIB or RS 232 interface using calibration commands Correction factors are stored in non volatile memory and are used during output programming Calibration from the front panel or a controller eliminate the need to remove the top cover or even the need to remove the power supply from your system cabinet You can guard against unauthorized calibration by using the Secured calibration protection function 18 Chapter 1 General Information Installation Installation Initial Inspection When you receive your power supply inspect it for any obvious damage that may have occurred during shipment If any damage is found notify the carrier and the nearest Agilent Sales Office immediately Warranty information is shown in the front of this manual Keep the original packing materials in case the power supply has to be returned to Agilent Technologies in the future If you return the power supply for service attach a tag identifying the owner and model number Also include a brief description of the problem Mechanical Check This check confirms that there are no broken keys or knob that the cabinet and panel surfaces are free of dents and scratches and that the display is not scratched or cracked
5. lt current gt DEF MIN MAX APPLY SOURce CURRent LEVel IMMediate AMPLitude lt current gt MIN MAX UP DOWN CURRent LEVel IMMediate AMPLitude MIN MAX CURRent LEVel IMMediate STEP INCRement lt numeric value gt DEFault CURRent LEVel IMMediate STEP INCRement DEFault CURRent LEVel TRIGgered AMPLitude lt current gt MIN MAX CURRent LEVel TRIGgered AMPLitude MIN MAX CURRent PROTection LEVel lt current gt MIN MAX CURRent PROTection LEVel MIN MAX CURRent PROTection STATe 0 1 OFF ON CURRent PROTection STATe CURRent PROTection TRIPped CURRent PROTection CLEar VOLTage LEVel IMMediate AMPLitude lt voltage gt MIN MAX UP DOWN VOLTage LEVel IMMediate AMPLitude MIN MAX VOLTage LEVel IMMediate STEP INCRement lt numeric value gt DEFault VOLTage LEVel IMMediate STEP INCRement DEFault VOLTage LEVel TRIGgered AMPLitude lt voltage gt MIN MAX VOLTage LEVel TRIGgered AMPLitude MIN MAX VOLTage PROTection LEVel lt voltage gt MIN MAX VOLTage PROTection LEVel MIN MAX VOLTage PROTection STATe 0 1 OFF ON VOLTage PROTection STATe VOLTage PROTection TRIPped VOLTage PROTection CLEar VOLTage RANGe P15V P30V LOW HIGH VOLTage RANGe MEASure CURRent DC VOLTage DC
6. J amp 1 Select the desired range using the range selection keys after turning on the power supply 2 Press the Display Limit key to show the limit values on the display 3 Move the blinking digit to the appropriate position using the resolution selection keys and change the blinking digit value to the desired voltage limit by turning the control knob If the display limit times out press the Display Limit key again 4 Set the knob to current control mode using the voltage current adjust selection key 5 Move the blinking digit to the appropriate position using the resolution selection keys and change the blinking digit value to the desired current limit by turning the control knob 6 Press the Output On Off key to enable the output After about 5 seconds the display will go to output monitoring mode automatically to display the voltage and current at the output or the display will go to output monitoring mode immediately by pressing the Output On Off key again Note All front panel keys and controls can be disabled with remote interface commands The Agilent E3632A must be in Local mode for the front panel keys and controls to function Display Annunciators afte E3632A 0 15V 7A 0 30V 4A Be Agilent DC POWER SUPPLY Yio N 4 NM AA Ae N A N Ae Wie NA fo N N N IS S IN UX UN IN UN UN UN UN UN UN UN UN cc a Rmt en 30V E aig SiE Limit ERRO
7. Electrical Check Chapter 2 describes an initial operation procedure which when successfully completed verifies to a high level of confidence that the power supply is operating in accordance with its specifications Detailed electrical verification procedures are included in the Service Guide Cooling and Location Cooling The power supply can operate without loss of performance within the temperature range of 0 C to 40 C and with derated output current from 40 C to 55 C A fan cools the power supply by drawing air through the rear panel and exhausting it out the sides Using an Agilent rack mount will not impede the flow of air Bench Operation Your power supply must be installed in a location that allows sufficient space at the sides and rear of the power supply for adequate air circulation The rubber bumpers must be removed for rack mounting 19 Chapter 1 General Information Installation Rack Mounting The power supply can be mounted in a standard 19 inch rack cabinet using one of three optional kits available A rack mounting kit for a single instrument is available as Option 1CM P N 5063 9243 Installation instructions and hardware are included with each rack mounting kit Any Agilent System IT instrument of the same size can be rack mounted beside the Agilent E3632A power supply Remove the front and rear bumpers before rack mounting the power supply al o
8. Return to the meter mode Press Display Limit key or let the display time out after several seconds to return to the meter mode Notice that the Limit annunciator turns off and the display shows OUTPUT OFF message Enable the output The OFF annunciator turns off and the 15V or 30V OVP OCP and CV annunciators are lit Notice that the display is in the meter mode In the meter mode the display shows the actual output voltage and current Refer to Programming Overvoltage Protection and Programming Overcurrent Protection sections starting on page 42 and page 45 for more information on OVP and OCP annunciators Verify that the power supply is in the constant voltage mode If you operate the power supply in the constant voltage CV mode verify that the CV annunciator is lit If the CC annunciator is lit choose a higher current limit During actual CV operation if a load change causes the current limit to be exceeded the power supply will automatically crossover to the constant current mode at the preset current limit and the output voltage will drop proportionately Remote interface operation CURRent lt current gt MIN MAX Set the current VOLTage lt voltage gt MIN MAX Set the voltage OUTPut ON Enable the output lYou can use the resolution selection keys to move the blinking digit to the right or left when setting voltage 37 Power Display Limit Chapter 3 Front Pa
9. starting on page 66 for an overview of the calibration features of the power supply For more detailed discussion of the calibration procedures see the Service Guide When you calibrate the power supply you should not set the OVP and OCP to ON state in order to prevent OVP or OCP from tripping CALibration COUNt This command queries the power supply to determine the number of times it has been calibrated Your power supply was calibrated before it left the factory When you receive your power supply read the count to determine its initial value Since the value increments by one for each calibration point a complete calibration will increase the value by 5 counts CALibration CURRent lt numeric value gt This command can only be used after calibration is unsecured and the output state is ON It enters a current value that you obtained by reading an external meter You must first select the minimum calibration level CAL CURR LEV MIN for the value being entered You must then select the middle and maximum calibration levels CAL CURR LEV MID and CAL CURR LEV MAX for the value being entered Three successive values must be selected and entered The power supply then computes new calibration constants These constants are then stored in non volatile memory CALibration CURRent LEVel MINimum MIDdle MAXimum This command can only be used after calibration is unsecured and the output state is ON It se
10. Manufacturer s Name and Addresss Responsible Party Alternate Manufacturing Site Agilent Technologies Inc Agilent Technologies Malaysia Sdn Bhd 550 Clark Drive Suite 101 Malaysia Manufacturing Budd Lake New Jersey 07828 Bayan Lepas Free Industrial Zone PH II USA 11900 Penang Malaysia Declares under sole responsibility that the product as originally delivered Product Name a Single Output dc Power Supply dual range b Single Output dc Power Supply single range c Single Output System Power Supply d Multiple Output dc Power Supply e Multiple Output System dc Power Supply Model Number a E3610A E3611A E3612A b E3614A E3615A E3616A E3617A c E3632A d E3620A E3630A e E3631A Product Options This declaration covers all options of the above product s Complies with the essential requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC including 93 68 EEC and carries the CE Marking accordingly EMC Information ISM Group Class A Emissions As detailed in Electromagnetic Compatibility EMC Certificate of Conformance Number CC TCF 00 102 based on Technical Construction File TCF ANJ12 dated Dec 20 2000 Assessed by Celestica Ltd Appointed Competent Body Westfields House West Avenue Kidsgrove Stoke on Trent Straffordshire ST7 1TL United Kingdom Safety Information and Conforms to the following safety standards IEC 61010 1 2001 EN 61010 1 2001 CSA C22 2 No 1010
11. No additional errors are stored until you remove errors from the queue If no errors have occurred when you read the error queue the power supply responds with 0 No error over the remote interface or NO ERRORS from the front panel The error queue is cleared when power has been off or after a CLS clear status command has been executed The RST reset command does not clear the error queue Front panel operation If the ERROR annunciator is on press the Error key repeatedly to read the errors stored in the queue All errors are cleared when you read all errors ERR 113 Remote interface operation SYST ERR Reads and error from the error queue Errors have the following format the error string may contain up to 80 characters 113 Undefined header 53 Chapter 3 Front Panel Operation System Related Operations Display Control For security reasons you may want to turn off the front panel display From the remote interface you can display a 12 character message on the front panel The display can be enabled disabled from the remote interface only When the display is turned off outputs are not sent to the display and all annunciators are disabled except the ERROR annunciator Front panel operation is otherwise unaffected by turning off the display The display state is stored in volatile memory the display is always enabled when power has been off after a remote in
12. GND 5 gt lt 5 5 l 6 DSR 6 6 6 7 RTS 7 7 7 8 CTS 8 8 8 20 RI 9 9 9 DB9 DB9 DB9 DB9 DB25 DB25 Male Female Female Male Female Male DTR DSR Handshake Protocol The power supply is configured as a DTE Data Terminal Equipment device and uses the DTR Data Terminal Ready and DSR Data Set Ready lines of the RS 232 interface to handshake The power supply uses the DTR line to send a hold off signal The DTR line must be TRUE before the power supply will accept data from the interface When the power supply sets the DTR line FALSE the data must cease within 10 characters To disable the DTR DSR handshake do not connect the DTR line and tie the DSR line to logic TRUE If you disable the DTR DSR handshake also select a slower baud rate to ensure that the data is transmitted correctly The power supply sets the DTR line FALSE in the following cases When the power supply s input buffer is full when approximately 100 characters have been received it sets the DTR line FALSE pin 4 on the RS 232 connector When enough characters have been removed to make space in the input buffer the power supply sets the DTR line TRUE unless the second case see next prevents this 64 Chapter 3 Front Panel Operation RS 232 Interface Configuration When the power supply wants to talk over the interface which means that it has processed a query and has received a lt new line gt message terminator it will set the DTR l
13. User s Guide Part Number E3632 90001 October 2007 For Safety information Warranties and Regulatory information see the pages behind the Index Copyright Agilent Technologies Inc 2000 2007 All Rights Reserved Agilent E3632A DC Power Supply The Agilent E3632A is a high performance 120 watt dual range DC power supply with GPIB and RS 232 interfaces The combination of bench top and system features in this power supply provides versatile solutions for your design and test requirements Convenient bench top features e Dual range e Easy to use knob control settings e Highly visible vacuum fluorescent display meters e High accuracy and high resolution e Remote voltage sensing e Overvoltage and overcurrent protection e Output on off e Excellent load and line regulation and low ripple and noise e Operating states storage e Portable ruggedized case with non skid feet Flexible system features e GPIB IEEE 488 and RS 232 interfaces are standard e SCPI Standard Commands for Programmable Instruments compatibility e T O setup easily done from front panel e Software calibration no internal adjustments required Agilent E3632A DC Power Supply The Front Panel at a Glance YO O 300gG0v Hoo A Adres Rm 16V 30V VM FUSING TION WALL LLL Ral T Protection 7 pa one i Voltage Current z ee Config
14. IMMediate STEP INCRement DEFault VOLTage LEVel TRIGgered AMPLitude lt voltage gt MIN MAX VOLTage LEVel TRIGgered AMPLitude MIN MAX VOLTage PROTection LEVel lt voltage gt MIN MAX VOLTage PROTection LEVel MIN MAX VOLTage PROTection STATe 0 1 OFF ON VOLTage PROTection STATe VOLTage PROTection TRIPped VOLTage PROTection CLEar VOLTage RANGe P15V P30V LOW HIGH VOLTage RANGe STATus QUEStionable CONDition QUEStionable EVENt QUEStionable ENABle lt enable value gt QUEStionable ENABle SYSTem BEEPer IMMediate ERRor VERSion TRIGger SEQuence DELay lt seconds gt MIN MAX SEQuence DELay SEQuence SOURce BUS IMM SEQuence SOURcCe 118 Chapter 4 Remote Interface Reference SCPI Conformance Information Device Specific Commands The following commands are device specific to the Agilent E3632A power supply They are not included in the 1995 0 version of the SCPI standard However these commands are designed with the SCPI standard in mind and they follow all of the command syntax rules defined by the standard Non SCPI Commands APPLy lt voltage gt DEF MIN MAX gt lt current gt DEF MIN MAX APPLy CALibration COUNt CURRent DATA lt numeric value gt CURRent LEVel MIN MID MAX CURRent PROTection DAC ERRor SECure CODE lt new code gt SECure STATe
15. OFF ON lt code gt SECure STATe STRing lt quoted string gt STRing VOLTage DATA lt numeric value gt VOLTage LEVel MIN MID MAX VOLTage PROTection OUTPut RELay STATe OFF ON RELay STATE SYSTem LOCal REMote RWLock 119 Chapter 4 Remote Interface Reference IEEE 488 Conformance Information IEEE 488 Conformance Information Dedicated Hardware Lines IEEE 488 Common Commands ATN Attention CLS IFC Interface Clear ESE lt enable value gt REN Remote Enable ESE SRQ Service Request Enable ESR TDN OPC Addressed Commands OPC PSC 0 1 DCL Device Clear PSC EOI End or Identify RST GET Group Execute Trigger SAV 1 2 3 GTL Go To Local RCL 1 2 3 iLO Local Lockout SRE lt enable value gt SDC Selected Device Clear SRE SPD Serial Poll Disable STB SPE Serial Poll Enable TRG TST WAL 120 Error Messages Error Messages When the front panel ERROR annunciator turns on one or more command syntax or hardware errors have been detected A record of up to 20 erros is stored in the power supply s error queue The power supply beeps once each time an error is generated Errors are retrieved in first in first out FIFO order The first error returned is the first error that was stored When you have read all errors from the queue the ERROR annunciator turns off If more than
16. configuration remote interface 56 60 connections parallel 151 series 151 connector GPIB 61 constant current operation 38 39 constant voltage amplifier 152 163 Index constant voltage operation 36 37 constant current mode 143 144 constant voltage mode 143 144 controller 17 cooling 19 cooling fan 19 coupling effects 147 current limit 36 144 current output checkout 30 D data frame 62 deadlock 65 device specific commands 119 disabling output 50 display annunciators 5 display control 54 distribution terminals 147 down programming speed 153 DSR 64 DTE 63 64 DTR 64 DTR DSR handshake protocol 64 dummy load resistor 150 E enable register 100 error 122 calibration 129 130 excution 123 127 self test 128 error conditions 53 error message 122 130 error queue 122 event register 100 external voltage source 147 F features 1 feedback control 141 firmware revision query 55 front panel drawing 2 enable disable 54 key descriptions 3 operation overview 35 voltage and current settings 4 front panel message 54 fuse rating 27 G GPIB address 57 58 factory setting 28 GPIB cable 15 GPIB connector 61 GPIB interface 56 GPIB interface configuration 61 H halting an output 116 I ideal constant current supply 143 ideal constant voltage supply 143 ideal power supply 145 IEEE 488 common commands 114 IEEE 488 conformance informat
17. lt new line gt is also accepted Command string termination will always reset the current SCPI command path to the root level The lt new line gt character has the ASCII decimal code of 10 IEEE 488 2 Common Commands The IEEE 488 2 standard defines a set of common commands that perform functions like reset self test and status operations Common commands always begin with an asterisk are four to five characters in length and may include one or more parameters The command keyword is separated from the first parameter by a blank space Use a semicolon to separate multiple commands as shown below RST CLS ESE 32 OPC 114 Chapter 4 Remote Interface Reference An Introduction to the SCPI Language SCPI Parameter Types The SCPI language defines several different data formats to be used in program messages and response messages Numeric Parameters Commands that require numeric parameters will accept all commonly used decimal representations of numbers including optional signs decimal points and scientific notation Special values for numeric parameters like MINimum MAXimum and DEFau1t are also accepted You can also send engineering unit suffixes V A or SEC with numeric parameters If only specific numeric values are accepted the power supply will automatically round the input numeric parameters The following command uses a numeric parameter CURR lt current gt MIN MAX UP D
18. 00000 L N a E ap S e A a s I TRE ES ap ES e To remove the rubber bumper stretch a corner and then slide it off 5 on000 00 O0000 0 To rack mount a single instrument order adapter kit 5063 9243 20 Chapter 1 General Information Installation Olo OOOO OO opogo OD OOOO CI opogo C Oo O 0 O To rack mount two instrument of the same depth side by side order lock link kit 5061 9694 and flange kit 5063 9214 To install two instruments in a sliding support shelf order support shelf 5063 9256 and slide kit 1494 0015 21 Chapter 1 General Information Input Power Requirements Input Power Requirements You can operate your power supply from anominal 100 V 115 V or 230 V single phase ac power source at 47 to 63 Hz An indication on the rear panel shows the nominal input voltage set for the power supply at the factory If necessary you can change the power line voltage setting according to the instructions on the next page Power Line Cord The power supply is shipped from the factory with a power line cord that has a plug appropriate for your location Contact the nearest Agilent Technologies Sales and Service Office if the wrong power line cord is included with your power supply Your power supply is equipped with a 3 wire grounding type power cord th
19. 1 1992 This DoC applies to above listed products placed on the EU market after January 1 2004 Date Bill Darcy Regulations Manager For further information please contact your local Agilent Technologies sales office agent or distributor or Agilent Technologies Deutschland GmbH Herrenberger Stra e 130 D71034 B blingen Germany Revision B 00 00 Issue Date Created on 11 24 2003 3 10 Document No KIO_10 32 11 24doc doc PM www agilent com Contact us To obtain service warranty or technical support assistance contact us at the following phone numbers United States tel 800 829 4444 fax 800 829 4433 Canada tel 877 894 4414 fax 800 746 4866 China tel 800 810 0189 fax 800 820 2816 Europe tel 31 20 547 2111 Japan tel 81 426 56 7832 fax 81 426 56 7840 Korea tel 080 7690800 fax 080 769 0900 Latin America tel 305 269 7500 Taiwan tel 0800 047 866 fax 0800 286 331 Other Asia Pacific Countries tel 65 6375 8100 fax 65 6755 0042 Or visit Agilent worlwide Web at www agilent com find assist Product specifications and descriptions in this document are subject to change without notice Agilent Technologies Inc 1997 2007 Printed in Malaysia Third Edition October 2007 E3632 90001 7 Agilent Technologies
20. 115 parity 57 59 62 performance specifications 156 158 power dissipation 154 power line cord 22 Power line voltage selection 22 power on reset state 2930 36 preregulation 141 program 132 138 programming overview 78 80 programming ranges 80 programming speed 152 153 down 153 up 152 protocol DTR DSR handshake 64 Q query 79 114 query command 79 query response 79 questionable status register 102 R rack mounting 20 rack mounting kit adapter kit 20 filler panel 21 flange kit 21 lock link kit 21 shelf 21 slide kit 21 sliding support shelf 21 rear panel drawing 6 GPIB connector 6 RS 232 connector 6 recall mode 41 recalling operating states 40 41 rectifier 141 resister questionable status 102 questionable status enable 102 questionable status event 102 standard event 103 104 standard event enable 104 status byte 104 106 status byte enable 105 status byte summary 105 register enable 100 register event 100 reliability 154 remote interface configuration 56 60 remote voltage sensing 48 49 148 connections 49 reverse polarity diode 151 RS 232 adapter kit 15 RS 232 interface 56 RS 232 interface command 99 RS 232 interface configuration 62 65 S safety and EMC requirements 14 safety considerations 14 SCPI command summary 73 77 SCPI command terminator 114 SCPI confirmed command 117 SCPI conformance 117 119 SCPI language introduction 111 115
21. 20 errors have occurred the last error stored in the queue the most recent error is replaced with 350 Too many errors No additional errors are stored until you remove errors from the queue If no erros have occurred when you read the error queue the supply responds with 0 No error over the remote interface or NO ERRORS from the front panel The error queue is cleared when power has been off or after a CLS clear status command has been executed The RST reset command command does not clear the error queue Front panel operation If the ERROR annunciator is on press the key repeatedly to read the errors stored in the queue The error queue is cleared when you read all errors Remote interface operation SYSTem ERRor Reads one error from the error queue Errors have the following format the error string may contain up to 80 characters 113 Undefined header 122 101 102 103 104 105 108 109 Chapter 5 Error Messages Execution Errors Execution Errors Invalid character An invalid character was found in the command string You may have inserted a character such as or in the command keyword or within a parameter Example OUTP STAT ON Syntax error Invalid syntax was found in the command string You may have inserted a blank space before or after a colon in the command header or before a comma Example VOLT LEV Invalid separator An i
22. 30 Chapter 3 Front Panel Operation Front Panel Operation Overview 35 Constant Voltage Operation 36 Constant Current Operation 38 Storing and Recalling Operating States 40 Programming Overvoltage Protection 42 Setting the OVP Level and Enable the OVP Circuit 42 Checking OVP Operation 43 Clearing the Overvoltage Condition 43 Programming Overcurrent Protection 45 Setting the OCP Level and Enable the OCP Circuit 45 Checking OCP Operation 46 Clearing the Overcurrent Condition 46 Remote Voltage Sensing 48 CV Regulation 48 Output Rating 48 Output Noise 48 Stability 49 Remote Voltage Sensing Connections 49 2 e gt mp 9 gt mp c 3 c o S Contents Chapter 3 Front Panel Operation continued Disabling the Output 50 Disabling the Output Using an External Relay 51 Knob Locking 51 System Related Operations 52 Self Test 52 Error Conditions 53 Display Control 54 Firmware Revision Query 55 SCPI Language Version 55 Remote Interface Configuration 56 Remote Interface Selection 56 GPIB Address 57 Baud Rate Selection RS 232 57 Parity Selection RS 232 57 To Set the GPIB Address 58 To Set the Baud Rate and Parity RS 232 59 GPIB Interface Configuration 61 RS 232 Interface Configuration 62 RS 232 Configuration Overview 62 RS 232 Data Frame Format 62 Connection to a Computer or Terminal 63 DTR DSR Handshake Protocol 64 RS 232 Troubleshooting 65 Calibration Overview 66 Calibration Se
23. 488 states that you should exercise caution if your individual cable lengths exceed 4 meters Do not stack more than three connector blocks together on any GPIB connector Make sure that all connectors are fully seated and that the lock screws are firmly finger tightened 61 Chapter 3 Front Panel Operation RS 232 Interface Configuration RS 232 Interface Configuration You connect the power supply to the RS 232 interface using the 9 pin DB 9 serial connector on the rear panel The power supply is configured as a DTE Data Terminal Equipment device For all communications over the RS 232 interface the power supply uses two handshake lines DTR Data Terminal Ready on pin 4 and DSR Data Set Ready on pin 6 The following sections contain information to help you use the power supply over the RS 232 interface The programming commands for RS 232 are explained on page 99 RS 232 Configuration Overview Configure the RS 232 interface using the parameters shown below Use the front panel I O Config key to select the baud rate parity and number of data bits see page 59 for more information to configure from the front panel e Baud Rate 300 600 1200 2400 4800 or 9600 baud factory setting e Parity and Data Bits None 8 data bits factory setting Even 7 data bits or Odd 7 data bits e Number of Start Bits 1 bit fixed e Number of Stop Bits 2 bits fixed RS 232 Data Frame Format A character
24. 97 CALibration SECure CODE 97 CALibration SECure STATe 97 CALibration SECure STATe 97 CALibration STRing 97 CALibration STRing 97 CALibration VOLTage LEVel 98 CALibration VOLTage PROTection 98 CURRent 82 CURRent PROTection 84 CURRent PROTection CLEar 84 CURRent PROTection STATe 84 CURRent PROTection STATe 84 CURRent PROTection TRIPped 84 CURRent PROTection 84 CURRent STEP 83 CURRent STEP 83 CURRent TRIGgered 83 CURRent TRiGgered 83 CURRent 83 device clear 99 DISPlay 92 DISPlay TEXT 92 DISPlay TEXT CLEar 92 DISPlay TEXT 92 DISPlay 92 INITiate 91 MEASure CURRent 88 MEASure 88 OUTPut 92 OUTPut RELay 93 OUTPut RELay 93 OUTPut 92 STATus QUEStionable COND tion 108 STATus QUEStionable ENABle 109 STATus QUEStionable ENABle 109 STATus QUEStionable 108 SYSTem BEEPer 93 SYSTem ERRor 93 108 SYSTem LOCal 99 SYSTem REMote 99 SYSTem RWLock 99 SYSTem VERSion 94 TRIGger DELay 91 TRIGger DELay 91 TRiGger SOURce 91 TRiGger SOURce 91 VOLTage 85 VOLTage PROTection 86 VOLTage PROTection CLEar 87 VOLTage PROTection STATe 87 VOLTage PROTection STATe 87 VOLTage PROTection TRIPped 87 VOLTage PROTection 87 VOLTage RANGe 87 VOLTage RANGe 87 VOLTage STEP 86 VOLTage STEP 86 VOLTage TRIGgered 86 VOLTage TRIGgered 86 VOLTage 85 commands format 112 command separator 113 command syntax 112 command terminator 114 common commands 114
25. A reset RST or device clear will not clear bits in event registers Querying an event register returns a decimal value which corresponds to the binary weighted sum of all bits set in the register What is an Enable Register An enable register defines which bits in the corresponding event register are logically ORed together to form a single summary bit Enable registers are both readable and writable Querying an enable register will not clear it The CLS clear status command does not clear enable registers but it does clear the bits in the event registers To enable bits in an enable register you must write a decimal value which corresponds to the binary weighted sum of the bits you wish to enable in the register 100 Chapter 4 Remote Interface Reference The SCPI Status Registers SCPI Status System Questionable Status Event Register Enable Register VOLTAGE 0 CURRENT 1 otuse Output Buffer Not used pe EMPERATURE 4 lot use Ss Not used lot use lot use OVERVOLTAGE 9 OVERCURRENT 10 lot use ot use Summary Register Not Used Not used ot use Not used lot use Not used STAT QUES STAT QUES ENAB lt value gt QUES STAT QUES ENAB MAV ESB m RAS Standard Event Not used Event Register Operation Complete OPC Not used Enable Register oO Status Byte Enable
26. Do not use the RS 232 interface if you have configured the power supply to output relay control signals Internal components on the RS 232 circuitry may be damaged Knob Locking The knob locking function can be used to disable the knob thereby preventing any unwanted changes during an experiment or when you leave the power supply unattended To disable the knob press the resolution selection key until the blinking digit disappears Notice that the knob and front panel keys are disabled when in the remote interface mode 51 Chapter 3 Front Panel Operation System Related Operations System Related Operations This section gives information on topics such as self test error conditions and front panel display control This information is not directly related to setting up the power supply but is an important part of operating the power supply Self Test A power on self test occurs automatically when you turn on the power supply This test assures you that the power supply is operational This test does not perform the extensive set of tests that are included as part of the complete self test described below If the power on self test fails the ERROR annunciator turns on A complete self test performs a series of tests and takes approximately 2 seconds to execute If all tests pass you can have a high confidence that the power supply is operational If the complete self test is successful PASS is displayed o
27. FUSE O LINE 100V 10 gS ooo 00 nev 10 LC eaoy 230v 10 C agi EE 1 Power line voltage setting 4 Power line module 2 Power line fuse holder assembly 5 GPIB IEEE 488 interface connector 3 AC inlet 6 RS 232 interface connector Use the front panel 1 0 Config key to e Select the GPIB or RS 232 interface see chapter 3 e Set the GPIB bus address see chapter 3 e Set the RS 232 baud rate and parity see chapter 3 In This Book General Information Chapter 1 contains a general description of your power supply This chapter also provides instructions for checking your power supply connecting to ac power and selecting power line voltage Initial Operation Chapter 2 ensures that the power supply develops its rated outputs and properly responds to operation from the front panel Front Panel Operation Chapter 3 describes in detail the use of front panel keys and how they are used to operate the power supply from the front panel This chapter also shows how to configure the power supply for the remote interface and gives a brief introduction to the calibration features Remote Interface Reference Chapter 4 contains reference information to help you program the power supply over the remote interface This chapter also explains
28. For additional information on programming the power supply over the remote interface See Remote Interface Reference starting on page 71 in chapter 4 Remote Interface Selection The power supply is shipped with both an GPIB IEEE 488 interface and an RS 232 interface on the rear panel Only one interface can be enabled at a time The GPIB interface is selected when the power supply is shipped from the factory The remote interface can be selected from the front panel only e The interface selection is stored in non volatile memory and does not change when power has been off or after a remote interface reset e Ifyou select the GPIB interface you must select a unique address for the power supply The current address is displayed momentarily on the front panel when you turn on the power supply e Your GPIB bus controller has its own address Be sure to avoid using the bus controller s address for any instrument on the interface bus Agilent Technologies controllers generally use address 21 e Ifyou enable the RS 282 interface you must select the baud rate and parity to be used RS 232 is displayed momentarily on the front panel when you turn on the power supply if you have selected this interface Refer to GPIB Interface Configuration starting on page 61 for more information on connecting the power supply to a computer over the GPIB interface Refer to RS 232 Interface Configuration starting on page 62 for mor
29. Register On KRW Serial Poll SPOLL STB SRE lt value gt SRE OR Query Error _ QYE Device Dependent Error DDE Execution Error 4 EXE Command Error CME Not used Power On PON ESR ORUN e ESE lt value gt FESE Binary Weight 2 1 2 2 4 23 8 24 16 2 32 2 64 27 128 28 256 29 512 210 1024 211 2048 2 2 4096 2 3 8192 214 16384 215 32768 101 Chapter 4 Remote Interface Reference The SCPI Status Registers The Questionable Status Register The Questionable Status register provides information about voltage and current regulation Bit 0 is set when the voltage becomes unregulated and bit Lis set if the current becomes unregulated For example if the power supply momentarily goes to constant current mode when the power supply is operating as a voltage source constant voltage mode bit 0 is set to indicate that the voltage output is not regulated The Questionable Status register also provides information that the power supply has an overtemperature condition and that the overvoltage and overcurrent protection circuits have tripped Bit 4 reports an overtemperature condition of the fan bit 9 reports that the overvoltage protection circuit has tripped and bit 10 reports that the overcurrent protection circuit has tripped To read the register send
30. SCPI parameters 115 SCPI status registers 100 107 SCPI version 55 SCPI version query 55 self test 52 semicolon 113 series connection 151 series regulated power supplies 141 series resistance 141 service request 105 setting baud rate 59 setting GPIB address 58 setting parity 59 slew rate 149 specifications 156 161 square brackets 73 112 stability 149 standard event register 103 start bit 62 status byte register 104 status register 100 107 status reporting commands 108 110 command 109 stop bit 62 storing operating states 4041 subsystems 111 supplemental characteristics 161 156 15 system related commands 92 95 T temperature range 19 transformer tap 141 tree system 111 triangle brackets 73 112 trigger source 79 89 bus software triggering 89 immediate triggering 90 triggering commands 89 91 troubleshooting RS 232 65 U unregulated state condition unregulated sate 145 unwanted signal 145 145 up programming response 152 Vv vertical bar 73 VFD 17 voltage limit 38 144 voltage output checkout 29 voltage spikes 146 W wiring adapter 63 165 Index 166 Copyright 1997 2007 Agilent Technologies All Rights Reserved Printing History Edition 3 October 2007 New editions are complete revisions of the manual Update packages which are issued between editions may contain additional infor
31. STATus QUEStionable Table 4 2 Bit Definitions Questionable Status Register Bit Decimal Definition Value 0 Voltage 1 The power supply is was in the constant current mode 1 Current 2 The power supply is was in the constant voltage mode 2 3 Not Used 0 Always set to 0 4 16 The fan has a fault condition Overtemperature 5 8 Not Used 0 Always set to 0 9 Over Voltage 512 The overvoltage protection circuit has tripped 10 Over Current 1024 The overcurrent protection circuit has tripped 11 15 Not Used 0 Always set to 0 The Questionable Status Event register is cleared when e You execute the CLS clear status command e You query the event register using STAT QUES Status Questionable Event register command For example 16 is returned when you have queried the status of the questionable event register the temperature condition is questionable The Questionable Status Enable register is cleared when e You execute STAT QUES ENAB 0 command 102 Chapter 4 Remote Interface Reference The SCPI Status Registers The Standard Event Register The Standard Event register reports the following types of instrument events power on detected command syntax errors command execution errors self test or calibration errors query errors or when an OPC commandis executed Any or all of these conditions can be reported in the standard event summary bit ESB b
32. Supply Showing the Optical Isolation 142 Chapter 7 Tutorial Output Characteristics Output Characteristics An ideal constant voltage power supply would have a zero output impedance at all frequencies Thus as shown in Figure 7 3 the voltage would remain perfectly constant in spite of any changes in output current demanded by the load Es Al OUT 0 AE our 0 Eour EouT ls lour lour Figure 7 3 Ideal Constant Voltage Figure 7 4 Ideal Constant Current Power Supply Power Supply The ideal constant current power supply exhibits an infinite output impedance at all frequencies Thus as Figure 7 4 indicates the ideal constant current power supply would accommodate a load resistance change by altering its output voltage by just the amount necessary to maintain its output current at a constant value The output of the E3632A power supply can operate in either constant voltage CV mode or constant current CC mode Under certain fault conditions the power supply can not operate in either CV or CC mode and becomes unregulated 143 Chapter 7 Tutorial Output Characteristics Figure 7 5 shows the operating modes of the output of the Agilent E3632A power supply The operating point of one supply will be either above or below the line Ry Re This line represents a load where the output voltage and the output current are equal to the voltage and current setting When the load Ry is greater th
33. VOLT PROT STAT ON VOLT RANG P15V Low 94 Chapter 4 Remote Interface Reference System Related Commands TST This query performs a complete self test of the power supply Returns 0 if the self test passes or 1 or any non zero value if it fails If the self test fails an error message is also generated with additional information on why the test failed SAV 1 2 3 This command stores the present state of the power supply to the specified location in non volatile memory Three memory locations numbered 1 2 and 3 are available to store operating states of the power supply The state storage feature remembers the states or values of the following commands CURR CURR STEP CURR TRIG CURR PROT CURR PROT STAT DISP OUTP OUTP REL TRIG DEL TRIG SOUR VOLT VOLT STEP VOLT TRIG VOLT PROT VOLT PROT STAT and VOLT RANG To recall a stored state you must use the same memory location used previously to store the state RCL 1 2 3 This command recalls a previously stored state To recall a stored state you must use the same memory location used previously to store the state Note DISP OFF ON can be stored and recalled in remote interface mode only Going to local mode automatically sets the display state to ON 95 Note Chapter 4 Remote Interface Reference Calibration Commands Calibration Commands See chapter 3 Calibration Overview
34. When 15V 7A range is selected the maximum programmable voltage and current are limited to 15 45 volts and 7 21 amps When 30V 4A range is selected the maximum programmable voltage and current are limited to 30 09 volts and 4 12 amps P30V or HIGH is the identifier for the 30V 4A range and P15V or LOW is for the 15V 7A range At RST the 15V 7A range is selected VOLTage RANGe This query returns the currently selected range The returned parameter is P30V HIGH or P15V LOW 87 Chapter 4 Remote Interface Reference Output Setting and Operation Commands MEASure CURRent This command queries the current measured across the current sense resistor inside the power supply MEASure VOLTage This command queries the voltage measured at the sense terminals of the power supply 88 Chapter 4 Remote Interface Reference Triggering Commands Triggering Commands The power supply s triggering system allows a change in voltage and current when receiving a trigger to select a trigger source and to insert a trigger Triggering the power supply is a multi step process e First you must specify the source from which the power supply will accept the trigger The power supply will accept a bus software trigger or an immediate trigger from the remote interface e Then you can set the time delay between the detection of the trigger on the specified trigger source and the start of any corre
35. and 2 mV p p Normal mode current lt 2 mA rms Common mode current lt 1 5 uA rms Load Regulation of output offset Change in output voltage or current for any load change within ratings with remote sensing connected Voltage lt 0 01 2 mV Current lt 0 01 250 uA Line Regulation of output offset Change in output voltage and current for any line change within ratings Voltage lt 0 01 2 mV Current lt 0 01 250 uA MlAccuracy specifications are after an 1 hour warm up with no load and calibration at 25 C 157 Chapter 8 Specifications Performance Specifications Programming Resolution Voltage 1 mv Current 0 5 mA Readback Resolution Voltage 0 5 mV Current 0 1 mA Front Panel Resolution Voltage 1 mV Current 1 mA Transient Response Time Less than 50 usec for output to recover to within 15 mV following a change in output current from full load to half load or vice versa Command Processing Time Average time for output voltage to begin to change after receipt of digital data when the power supply is connected directly to the GPIB or RS 232 is less than 100 msec OVP and OCP Accuracy of output offset OVP 0 5 0 5 V OCP 0 5 0 5 A Activation time Average time for output to start to drop after OVP or OCPcondition occurs OVP lt 1 5 msec when the trip voltage is equal or greater than 3 V lt 10 msec when the trip voltage is less than 3 V OCP lt 10 msec 158 C
36. annunciator turns on and the output is disabled e The display provides the present operating status of the power supply with annunciators and also informs the user of error codes For example the power supply is operating in CV mode in the 15V 7A range and controlled from the front panel then the CV and 15V annunciators will turn on If however the power supply is remotely controlled the Rmt annunciator will also turn on and when the power supply is being addressed over GPIB interface the Adrs annunciator will turn on See Display Annunciators on page 5 for more information 35 Power Display Limit Volt Curr Chapter 3 Front Panel Operation Constant Voltage Operation Constant Voltage Operation To set up the power supply for constant voltage CV operation proceed as follows Front panel operation Connect a load to the output terminals With power off connect a load to the and output terminals Turn on the power supply The power supply will go into the power on reset state the output is disabled the OFF annunciator turns on the 15V 7A range is selected the 15V annunciator turns on and the knob is selected for voltage control To operate the power supply in the 30V 4A range press the 30v 4A key before proceeding to the next step The 30V annunciator turns on Set the display to the limit mode Notice that the Limit annunciator blinks indicating that the display
37. crowbar SCR which effectively shorts the output of the power supply whenever the overvoltage condition occurs If external voltage source such as a battery is connected across the output and the overvoliage condition inadvertently occurs the SCR will continuously sink a large current from the source possibly damaging the power supply To avoid this a diode must be connected in series with the output as shown below POWER BATTERY SUPPLY NOTE If remote sensing connect Sense lead to Anode side of diode N T Figure 3 1 Recommended Protection Circuit for Battery Charging 44 Chapter 3 Front Panel Operation Programming Overcurrent Protection Programming Overcurrent Protection Overcurrent protection guards the load against output currents that reach a specified value greater than the programmed protection level It is accomplished by programming the output current to zero The following steps show how to set the overcurrent protection trip level how to check OCP operation and how to clear overcurrent condition e Front panel operation Setting the OCP Level and Enable the OCP Circuit Power 1 Turn on the power supply The power supply will go into the power on reset state the output is disabled the OFF annunciator turns on the 15V 7A range is selected the 15V annunciator turns on and the knob is selected for voltage control Output On Off 2 Enable the output The OFF an
38. e RS 232 Interface Commands page 99 e The SCPI Status Registers page 100 e Status Reporting Commands page 108 e An Introduction to the SCPI Language page 111 e Halting an Output in Progress page 116 e SCPI Conformance Information page 117 e TEEE 488 Conformance Information page 120 If you are a first time user of the SCPI language you may want to refer to these sections to become familiar with the language before attempting to program the power supply 72 Chapter 4 Remote Interface Reference SCPI Command Summary SCPI Command Summary This section summarizes the SCPI Standard Commands for Programmable Instruments commands available to program the power supply over the remote interface Refer to the later sections in this chapter for more complete details on each command Throughout this manual the following conventions are used for SCPI command syntax e Square brackets indicate optional keywords or parameters e Braces enclose parameters within a command string e Triangle brackets lt gt indicate that you must substitute a value or a code for the enclosed parameter e A vertical bar separates one of two or more alternative parameters scri First time SCPI users see page 111 73 Chapter 4 Remote Interface Reference SCPI Command Summary Output Setting and Measurement Commands APPLy lt voltage gt DEF MIN MAX
39. front panel operation mode At power on the power supply is automatically set to operate in the front panel operation mode When in this mode the front panel keys can be used When the power supply is in remote operation mode you can return to front panel operation mode at any time by pressing the Local keyif you did not previously send the front panel lockout command A change between front panel and remote operation modes will not result in a change in the output parameters e The power supply has two output ranges of 15V 7A or 30V 4A This feature allows more voltage at a lower current or more current at a lower voltage The desired output range is selected from the front panel or over the remote interfaces The 15V or 30V annunciator indicates the presently selected range e When you press Display Limit key the Limit annunciator blinks the display of the power supply goes to the limit mode and the present limit values will be displayed In this mode you can also observe the change of the limit values when adjusting the knob If you press the Display Limit key again or let the display time out after several seconds the power supply will return the display to the meter mode the Limit annunciator turns off In this mode the actual output voltage and current will be displayed e The output of the power supply can be enabled or disabled from the front panel using the Output On Off key When the output is off the OFF
40. gt gt J c 3 c o S Contents Chapter 5 Error Messages Execution Errors 1283 Self Test Errors 128 Calibration Errors 129 Chapter 6 Application Programs C Example for GPIBQEEE 488 133 Excel 5 0 Example for Windows 3 1 and GPIB 135 Chapter 7 Tutorial Overview of Agilent E3632A Operation 141 Output Characteristics 143 Unregulated State 145 Unwanted Signals 145 Connecting the Load 147 Output Isolation 147 Multiple Loads 147 Remote Voltage Sensing 148 Load Consideration 149 Extending the Voltage and Current Range 151 Series Connections 151 Parallel Connections 151 Remote Programming 152 Reliability 154 Chapter 8 Specifications Performance Specifications 157 Supplemental Characteristics 159 Index 163 General Information General Information This chapter provides a general description of your power supply This chapter also contains instructions for initial inspection location and cooling for bench and rack operation selecting the power line voltage and connecting your power supply to ac power Safety Considerations This power supply is a Safety Class I instrument which means that it has a protective earth terminal That terminal must be connected to earth ground through a power source with a 3 wire ground receptacle Before installation or operation check the power supply and review this manual for safety markings and instructions Safety inform
41. how to program for status reporting Error Messages Chapter 5 lists the error messages that may appear as you are working with the power supply Each listing contains information to help you diagnose and solve the problem Application Programs Chapter 6 contains some remote interface applications to help you develop programs for your application Tutorial Chapter 7 describes basic operation of linear power supplies and gives specific details on the operation and use of the Agilent E3632A power supply Specifications Chapter 8 lists the power supply s specifications If you have questions relating to the operation of the power supply call 1 800 829 4444 in the United States or contact your nearest Agilent Technologies Sales Office If your Agilent E3632A fails within one year of purchase Agilent will repair or replace it free of charge Call 1 800 258 5165 Express Exchange in the United States or contact your nearest Agilent Technologies Sales Office Contents Chapter 1 General Information Safety Considerations 14 Safety and EMC Requirements 14 Options and Accessories 15 Options 15 Accessories 15 Description 16 Installation 19 Initial Inspection 19 Cooling and Location 19 Input Power Requirements 22 Power Line Cord 22 Power Line Voltage Selection 22 Chapter 2 Initial Operation Preliminary Checkout 27 Power On Checkout 28 Output Checkout 29 Voltage Output Checkout 29 Current Output Checkout
42. is in the limit mode When the display is in the limit mode you can see the voltage and current limit values of the power supply In constant voltage mode the voltage values between the meter and limit modes are the same but the current values are not Moreover if the display is in the meter mode you cannot see the change of current limit value when adjusting the knob We recommend that you should set the display to limit mode to see the change of current limit value in the constant voltage mode whenever adjusting the knob Adjust the knob for the desired current limit al Check that the Limit annunciator still blinks Set the knob for current control The second digit of the ammeter will be blinking The blinking digit can be changed using the resolution selection keys and the blinking digit can be adjusted by turning the knob Adjust the knob to the desired current limit lYou can use the resolution selection keys to move the blinking digit to the right or left when setting current 36 Volt Curr Display Limit Output On Off Note Chapter 3 Front Panel Operation Constant Voltage Operation Adjust the knob for the desired output voltage cy er Check that the Limit annunciator still blinks Set the knob for voltage control The second digit of the voltmeter will be blinking Change the blinking digit using the resolution selection keys and adjust the knob to the desired output voltage
43. more voltage at a lower current The desired output range is selected from the front panel or over the remote interfaces Operational features include Dual range of 15V 7A or 30V 4A Constant voltage CV or constant current CC operation Overvoltage protection OVP and overcurrent protection OCP Three storage locations 1 to 3 for user defined operating states Automatic turn on self test Remote sensing for load voltage User calibration from the front panel or over the remote interfaces The front panel operation permits Easy to use of knob control Output range selection Enabling or disabling OVP and OCP features Setting the OVP and OCP trip levels Clearing OVP and OCP conditions Setting and displaying the voltage and current limit values Saving and recalling operating states Returning the power supply to local mode from remote interface mode Displaying remote interface error message Calibrating the power supply including changing the calibration secure code Configuring the power supply for remote interfaces Enabling or disabling the output Warning Chapter 1 General Information Description When operated over the remote interface the power supply can be both a listener and a talker Using an external controller you can instruct the power supply to set the output and to send the status data back over the GPIB or RS 232 Capabilities include the following features Voltage and current programming
44. power supply waits for all pending operations to complete before executing any additional commands For example the following command string guarantees that the first trigger is accepted and is executed before the second trigger is recognized TRIG SOUR BUS TRG WATI TRG WAIL You can use the OPC operation complete query command or the OPC operation complete command to signal when the operation is complete The OPC command returns 1 to the output buffer when the operation is complete The OPC command sets the OPC bit bit 0 in the Standard Event register when the operation is complete Immediate Triggering To select the immediate trigger source send the following command TRIG SOUR IMM When the IMMediate is selected as a trigger source an INITiate command immediately transfers the VOLT TRIG or CURR TRIG value to VOLT or CURR value Any delay is ignored 90 Chapter 4 Remote Interface Reference Triggering Commands Triggering Commands INITiate This command causes the trigger system to initiate This command completes one full trigger cycle when the trigger source is an immediate and initiates the trigger subsystem when the trigger source is bus TRiGger DELay lt seconds gt MINimum MAXimum This command sets the time delay between the detection of an event on the specified trigger source and the start of any corresponding trigger action on the power supply o
45. prepay ship ping charges to Agilent and Agilent shall pay shipping charges to return the prod uct to the Buyer However the Buyer shall pay all ship ping charges duties and taxes for products returned to Agilent from another country Limitation of Warranty The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Buyer Buyer supplied products or interfacing unauthorized modification or misuse operation outside of the environmental specifi cations for the product or improper site preparation or maintenance The design and implementa tion of any circuit on this product is the sole responsi bility of the Buyer Agilent does not warrant the Buyer s circuitry or malfunctions of Agilent products that result from the Buyer s circuitry In addition Agilent does not warrant any damage that occurs as a result of the Buyer s circuit or any defects that result from Buyer supplied products To the extent allowed by local law Agilent makes no other warranty expressed or implied whether written or oral with respect to this prod uct and specifically dis claims any implied warranty or condition of merchantability fitness for a particular purpose or satisfactory quality For transactions in Austra lia and New Zealand The warranty terms contained in this statement except to the extent lawfully permitted do not exclude restrict or modify and are in addi
46. selection the limit value settings of voltage and current output on off state OVP and OCP on off state and OVP and OCP trip levels Turn on the storage mode Three memory locations numbered 1 2 and 3 are available to store the operating states The operating states are stored in non volatile memory and are remembered when being recalled STORE 1 This message appears on the display for approximately 3 seconds Store the operating state in memory location 3 D Turn the knob to the right to specify the memory location 3 STORE 3 To cancel tke store operation let the display time out after about 3 seconds or press any other function key except the Store key The power supply returns to the normal operating mode and to the function pressed Chapter 3 Front Panel Operation Storing and Recalling Operating States Store 4 Save the operating state The operating state is now stored To recall the stored state go to the following steps DONE This message appears on the display for approximately 1 second Recall 5 Turn on the recall mode Memory location 1 will be displayed in the recall mode RECALL 1 This message appears on the display for approximately 3 seconds 6 Recall the stored operating state Turn the knob to the right to change the displayed storage location to 3 RECALL 3 If this setting is not followed within 3 seconds with Recall key stroke the power supply returns to no
47. that allow the communication in a simple form The macro called Diode is an example that tests a diode using the other module To try the example for characterizing a diode type in both modules Once the modules are completed go to a worksheet In cell A4 type Volts in cell B4 type Current In cells A5 type 0 6 Fill in the cells A4 to A15 in 0 02 increments so that cell A15 contains 0 8 Now while the cursor is still in the worksheet select Tools Macro from the menu Double click on the Diode macro in the Macro dialog box The power supply will reset to power on condition and then step through the voltages in the worksheet After each step the current is measured and recorded in the worksheet Make any changes to suit your needs in the Diode bas module Change the GPIB address in the routine OpenPort contained in the GPIB bas module Ifthere is asystem error when trying to run the macro you may have to reboot the PC for the GPIB port to work 135 Chapter 6 Application Programs Excel 5 0 Example for Windows 3 1 and GPIB Diode bas Macro Option Explicit This is the subroutine first executed Modify this routine to suit your needs To change the GPIB address go to the module GPIB Sub OpenPort and change the variable VISAaddr 5 to the required GPIB address Sub Diode Range B5 B15 ClearContents Dim I As Integer OpenPort SendSCPI RST Reset E3632A to p
48. the remote interface 126 430 440 501 502 511 512 513 514 521 522 550 Chapter 5 Error Messages Execution Errors Query DEADLOCKED A command was received which generates too much data to fit in the output buffer and the input buffer is also full Command execution continues but all data is lost Query UNTERMINATED after indefinite response The IDN command must be the last query command within a command string Example IDN SYST VERS Isolator UART framing error Isolator UART overrun error RS 232 framing error RS 232 overrun error RS 232 parity error Command allowed only with RS 232 There are three commands which are only allowed with the RS 232 interface SYySTem LOCal SYSTem REMote and SYSTem RWLock Input buffer overflow Output buffer overflow Command not allowed in local You should always execute the SYSTem REMote command before sending other commands over the RS 232 interface 127 601 602 603 604 605 606 607 608 624 625 626 630 631 632 Chapter 5 Error Messages Self Test Errors Self Test Errors The following errors indicate failures that may occur during a self test Refer to the Service Guide for more information Front panel does not respond RAM read write failed A D sync stuck A D slope convergence failed Cannot calibrate rundown gain Rundown gain out of range Rundown to
49. to read the security code rules on page 66 before attempting to secure the power supply Front Panel Operation UNSECURED If the power supply is unsecured you will see the above message for one second by holding the Calibrate key for 5 seconds when you turn on the power supply To secure the power supply press the Secure key after the CAL MODE message is displayed in the calibration mode enter the security code using the knob and resolution selection keys and then press the Secure key Notice that you should omit the H P and enter the remaining numbers as shown below 000000 CODE When you press Secure key to save the change you will see the message below The secured setting is stored in non volatile memory and does not change when power has been off or after a remote interface reset To exit the calibration mode turn the power off and on SECURED Remote Interface Operation CAL SEC STAT OFF ON lt code gt Secure or unsecure the power supply To secure the power supply send the above command with the same code as used to unsecure For example CAL SEC STAT ON HP003632 68 Chapter 3 Front Panel Operation Calibration Overview To Change the Security Code To change the security code you must first unsecure the power supply and then enter a new code Be sure to read the security code rules on page 66 before attempting to secure the power supply Front Panel O
50. 7 1 shows a controlled transformer tap as used in the Agilent E3632A Thisis one of several techniques using semiconductors for preregulation to reduce the power dissipated across the series element 141 Chapter 7 Tutorial Overview of Agilent E3632A Operation In terms of performance a linear regulated supply has a very precise regulating properties and responds quickly to variations of the line and load Hence its line and load regulation and transient recovery time are superior to supplies using other regulation techniques The power supply also exhibits low ripple and noise is tolerant of ambient temperature changes and with its circuit simplicity has a high reliability The Agilent E3632A contains a linear regulated power supply It is controlled by acontrol circuit that provides voltages to program the outputs The power supply sends back to the control circuits a voltage representing the output at the terminals The control circuits receive information from the front panel and send information to the display Similarly the control circuits talk to the remote interface for input and output with the GPIB and RS 232 interfaces The remote interface is at earth ground and optically isolated from the control circuit and the power supply OPTICAL ISOLATIO HP B p m O CONTROL POWER SUPPLY DISPLAY OUTPUT RS 232 lt q pe Figure 7 2 Block Diagram of the Power
51. EE 488 bus interface hardware and will be executed only after previous commands have completed Polling is not possible using the STB command Executing the STB command does not clear the Status Byte summary register Using the Message Available Bit MAV You can use the Status Byte message available bit bit 4 to determine when data is available to read into your bus controller The power supply subsequently clears bit 4 only after all messages have been read from the output buffer To Interrupt Your Bus Controller Using SRQ 1 Send a device clear message to clear the power supply s output buffer e g CLEAR 705 2 Clear the event registers with the CLS clear status command 3 Set up the enable register masks Execute the ESE command to set up the Standard Event register and the SRE command for the Status Byte 4 Sendthe OPC operation complete query command and enter the result to ensure synchronization 5 Enable your bus controller s IEEE 488 SRQ interrupt 106 Chapter 4 Remote Interface Reference The SCPI Status Registers To Determine When a Command Sequence is Completed Send a device clear message to clear the power supply s output buffer e g CLEAR 705 Clear the event registers with the CLS clear status command Enable the operation complete bit bit 0 in the Standard Event register by executing the ESE 1 command Send the OPC operatio
52. Error trapping however is good programming practice and is recommended in your application See your VISA user s guide for more information about error trapping The example program was written in Microsoft Visual C ver 1 52 project type Quick Win application using the large memory model Be sure to move the visa lib and visa h file to the lib and include development directory These are usually found at c vxipnp win lib msc and c vxipnp win include Diode c Diode C This example program steps the E3632A DC Power Supply through 10 voltages and measures the current response It prints the voltage step and the current response as a table Note that the GPIB address is the default address from the factory for the E3632A include lt visa h gt include lt stdio h gt include lt string h gt include lt time h gt Provides a delay of the specified time wait in milliseconds void delay clock_t wait void main ViSession defaultRM resource manager id ry ViSession power_supply session id to an instrument A char reply_string 256 string returned from instrument ef char GPIB_address 3 GPIB address of instrument iat char Visa_address 40 Complete VISA address send to card double voltage value of voltage sent to power supply Ry double current value of current output of power supply build the address needed to open communication with GPIB card addre
53. For example when the output is programmed for a large voltage step the output capacitor or a large capacitive load will charge up at the current limit setting During the ramp up of the output voltage the power supply will be in the unregulated mode During the transition from CV to CC as when the output is shorted the unregulated state may occur briefly during the transition Unwanted Signals An ideal power supply has a perfect dc output with no signals across the terminals or from the terminals to earth ground The actual power supply has finite noise across the output terminals and a finite current will flow through any impedance connected from either terminal to earth ground The first is called normal mode voltage noise and the second common mode current noise Normal mode voltage noise is in the form of ripple related to the line frequency plus some random noise Both of these are of very low value in the Agilent E3632A Careful lead layout and keeping the power supply circuitry away from power devices and other noise sources will keep these values low Common mode noise can be a problem for very sensitive circuitry that is referenced to earth ground When a circuit is referenced to earth ground alow level line related ac current will flow from the output terminals to earth ground Any impedance to earth ground will create a voltage drop equal to the current flow multiplied by the impedance To minimize this effect the output termina
54. IAL Eoyr LRL E Te Tr RISE TIME Riton L E i R l R t0 el ILRL E 2 OUT i 0 h ty NEW Egut IS REACHED inn t NEW Eour IS PROGRAMMED EQUIVALENT CIRCUIT FOR h lt t lt t2 Figure 7 8 Speed of Response Programming Up Full Load The equivalent circuit and the nature of the output voltage waveform when the supply is being programmed upward are shown in Figure 7 8 When the new output is programmed the power supply regulator circuit senses that the output is less than desired and turns on the series regulator to its maximum value I the current limit or constant current setting This constant current ly charges the output capacitor Co and load resistor Ry parallel The output therefore rises exponentially with a time constant Ry Cy towards voltage level I R a value higher than the new output voltage being programmed When this exponential rise reaches the newly programmed voltage level the constant voltage amplifier resumes its normal regulating action and holds the output constant Thus the rise time can be determined approximately using the formula shown in Figure 7 8 152 Chapter 7 Tutorial Remote Programming If no load resistor is attached to the power supply output terminal then the output voltage will rise linearly at a rate of Co l when programmed upward and Tp Co Ep E V I the shortest possible up programming time TC R Co a E INITIAL Eout
55. OWN Discrete Parameters Discrete parameters are used to program settings that have a limited number of values like BUS IMM Query responses will always return the short form in all upper case letters The following command uses discrete parameters TRIG SOUR BUS IMM Boolean Parameters Boolean parameters represent a single binary condition that is either true or false For a false condition the power supply will accept OFF or 0 For a true condition the power supply will accept ON or 1 When you query a boolean setting the power supply will always return 0 or 1 The following command uses a boolean parameter DISP OFF ON String Parameters String parameters can contain virtually any set of ASCII characters A string must begin and end with matching quotes either with a single quote or with a double quote You can include the quote delimiter as part of the string by typing it twice without any characters in between The following command uses a string parameter DISP TEXT lt quoted string gt 115 Note Chapter 4 Remote Interface Reference Halting an Output in Progress Halting an Output in Progress You can send a device clear at any time to stop an output in progress over the GPIB interface The status registers the error queue and all configuration states are left unchanged when a device clear message is receiv
56. R OFF Unreg Adrs Power supply is addressed to listen or talk over a remote interface Rmt Power supply is in remote interface mode 15V Shows the 15V 7A range is selected 30V Shows the 30V 4A range is selected OVP The overvoltage protection function is enabled when the annunciator turns on or the overvoltage protection circuit has caused the power supply to shutdown when the annunciator blinks OCP The overcurrent protection function is enabled when the annunciator turns on or the overcurrent protection circuit has caused the power supply to shutdown when the annunciator blinks CAL The power supply is in calibration mode Limit The display shows the limit values of voltage and current ERROR Hardware or remote interface command errors are detected and the error bit has not been cleared OFF The output of the power supply is disabled See page 52 for more information Unreg The output of the power supply is unregulated output is neither CV nor CC CV The power supply is in constant voltage mode cc The power supply is in constant current mode To review the display annunciators hold down Display Limit turn on the power supply key as you The Rear Panel at a Glance EE Agilent SER OPT _ Made In Korea x een G LR 85750 ISM_1 A WARNING NO OPERATOR PARTS INSIDE REFER SERVICING USE SPECIFIED LINE
57. RS 232 Interface Commands SYSTem LOCal REMote RWLOck IEEE 488 2 Common Commands CLS ESE lt enable value gt kE S E ESR IDN OPC OPC 2 Psc 0 1 PSC RST SAV 1 2 3 RCL 1 2 3 SRE lt enable value gt SRE STB TRG TST WAL we gt 77 Chapter 4 Remote Interface Reference Simplified Programming Overview Simplified Programming Overview This section gives an overview of the basic techniques used to program the power supply over the remote interface This section is only an overview and does not give all of the details you will need to write your own application programs Refer to the remainder of this chapter and also chapter 6 Application Programs for more details and examples Also refer to the programming reference manual that came with your computer for details on outputting command strings and entering data Using the APPLy Command The APPLy command provides the most straightforward method to program the power supply over the remote interface For example the following statement executed from your computer will set the power supply to an output of 3 V rated at 1 A APPL 3 0 1 0 Using the Low Level Commands Although the APPLy command provides the most straightforward method to program the power supply the low level commands give you more flexibility to change individual parameters For example the following sta
58. Voltage and current readback Present and stored status readback Programming syntax error detection Complete self test The front panel VFD Vacuum Fluorescent Display includes Displaying actual values of output voltage and current meter mode Or displaying the limit values of voltage and current limit mode Checking the operating status from the annunciators Checking the type of error from the error codes messages Connections to the power supply s output and to chassis ground are made to binding posts on the front panel Floating the power supply output more than 60 Vdc from the chassis presents an electric shock hazard to the operator Do not float the outputs more than 60 Vdc when metal shorting bars without insulation are used to connect the output to the sense and the output to the sense terminals cm Output 7 S S 00000 A Float voltage 60 Vdc Max tol shorting conductors without insulation 17 Warning Chapter 1 General Information Description Outputs can be floated to maximum of 240 Vdc provided that the metal shorting bars without insulation are either replaced with insulated conductors or they are removed from the terminals so there is no operator access to the output conductors without insulation All field wiring insulation must be adequate for the voltage present r Output V N 0 0 0 0 O A Float voltage 240 Vdc Max tol insulated shorting conductors
59. a The specified DAC calibration values CAL VOLT or CAL CURR are out of range Note that the new calibration constants are not stored in the non volatile memory Bad readback cal data The specified readback calibration values CAL VOLT or CAL CURR are out of range Note that the new calibration constants are not stored in the non volatile memory 129 714 715 716 717 740 741 742 743 744 745 746 747 748 749 750 Chapter 5 Error Messages Calibration Errors Bad OVP cal data The overvoltage protection calibration constant is out of range Note that the new calibration constants are not stored in the non volatile memory Bad OCP cal data The overcurrent protection calibration constant is out of range Note that the new calibration constants are not stored in the non volatile memory Bad DAC DNL error correction data Invalid data measured during the calibration for DAC differential nonlinearity error correction Cal OVP or OCP status enabled Overvoltage protection status or overcurrent protection status is enabled You must set both overvoltage and overcurrent protection status to OFF before and during the calibration Cal checksum failed secure state Cal checksum failed string data Cal checksum failed store recall data in location 0 Cal checksum failed store recall data in location 1 Cal checksum failed store recall data in location 2 Cal checksum failed store recall
60. adation of regulation that would occur due to the voltage drop in the leads between the power supply and the load By connecting the power supply for remote voltage sensing voltage is sensed at the load rather than at the power supply s output terminals This will allow the power supply to automatically compensate for the voltage drop in applications with long lead lengths as well as to accurately read back the voltage directly across the load When the power supply is connected for remote sensing the OVP circuit senses the voltage at the sensing points load and not the output terminals CV Regulation The voltage load regulation specification in chapter 8 applies at the output terminals of the power supply When remote sensing add 5 mV to this specification for each 1 V drop between the positive sensing point and output terminal due to the change in load current Because the sense leads are part of the power supply s feedback path keep the resistance of the sense leads at or below 0 5 Q per lead to maintain the above specified performance Output Rating The rated output voltage and current specifications in chapter 8 apply at the output terminals of the power supply With remote sensing any voltage dropped in the load leads must be added to the load voltage to calculate maximum output voltage The performance specifications are not guaranteed when the maximum output voltage is exceeded If the excessive demand on the power supp
61. after a remote interface reset The power supply displays a message to show that the change is now in effect If the GPIB address is not changed NO CHANGE will be displayed for one second To exit the I O configuration mode without any further changes press the I O Config key until the NO CHANGE message is displayed 58 Chapter 3 Front Panel Operation Remote Interface Configuration To Set the Baud Rate and Parity RS 232 To configure the power supply for the RS 232 interface proceed as follows I O Config Turn on the remote configuration mode GPIB 488 You will see the above message on the display if the power supply has not been changed from the factory setting Notice that if you changed the remote interface selection to RS 232 before RS 232 message will be displayed N Choose the RS 232 interface C D RS 232 You can choose the RS 232 interface by turning the knob to the left I O Config w Move to the RS 232 interface setting mode and select the baud rate 9600 BAUD The rate is set to 9600 baud when the power supply is shipped from the factory Choose from one of the following by turning the knob to the right or left 300 600 1200 2400 4800 or 9600 baud I O Config 4 Save the change and choose the parity O NONE 8 BITS The power supply is configured for 8 data bits with no parity when shipped from the factory Choose from one of the foll
62. age control Enable the output The OFF annunciator turns off and the display will go to the meter mode Enter the OVP menu and set the trip level LEVEL 32 0 V You will see the above message on the display when you enter the OVP menu Adjust the control knob for the desired OVP trip level Note that you cannot set the trip levels to lower than 1 0 volt Enable the OVP circuit OVP ON You will see the above message after pressing Over Voltage key 42 Over Voltage Over Voltage or Display Limit Over Voltage Chapter 3 Front Panel Operation Programming Overvoltage Protection Exit the OVP menu CHANGED The CHANGED message is highlighted for a second to show that the new OVP trip level is now in effect If the OVP settings are not changed NO CHANGE will be displayed The power supply will exit the OVP menu and the display will return to the meter mode Check that the OVP annunciator turns on Checking OVP Operation To check OVP operation raise the output voltage to near the trip point Then very gradually increase the output by turning the knob until the OVP circuit trips This will cause the power supply output to drop to near zero the OVP annunciator to blink and the CC annunciator to turn on The OVP TRIPPED message also appears on the display Clearing the Overvoltage Condition When the OVP condition occurs the OVP TRIPPED message
63. ait clock_t goal clock_t delay wait wait 1000 delay clock_t wait CLOCKS_PER_SEC goal delay clock while goal gt clock End of Program s set voltage print power supply setting retrieve reading print reading turn off output allow output to settle for 500 msec measure output current SA E 134 Chapter 6 Application Programs Excel 5 0 Example for Windows 3 1 and GPIB Excel 5 0 Example for Windows 3 1 and GPIB Excel VB Macros may be used to control your Agilent E8632A With Excel you can take the value of a cell in a spread sheet send it to the power supply and then record the response on the worksheet The example on the following pages characterizes a component across the Agilent E3632A terminals This example reads 11 voltages from a worksheet programs the Agilent E3632A to that voltage and then reads the current The value of current is recorded next to the voltage on the spread sheet The example is for Excel 5 0 in Windows 3 1 To write macros and control the power supply in Excel first open a module in Excel From the Insert menu choose Macro and then Module Name the module created this way Diode bas click the right mouse button on the tab Create one more module named GPIB bas The module GPIB bas will set up all the overhead needed to talk to the GPIB port This module will subroutines
64. am the power supply Although the APPLy command provides the most straightforward method to program the power supply the low level output setting commands give you more flexibility to change the individual parameters CURRent lt current gt MINimum MAXimum UP DOWN This command programs the immediate current level of the power supply The immediate level is the current value of the output terminals The CURRent command changes the output of the power supply to the newly programmed value regardless of the output range presently selected You can substitute MINimum or MAXimum in place of a specific value for the current parameter MIN selects the lowest current values of 0 amps MAX selects the highest current values allowed for the selected range This command also increases or decreases the immediate current level using the UP or DOWN parameter by a predetermined amount The command CURRent STEP sets the amount of increase or decrease Notice that a new increment setting will cause an execution error 222 Data out of range when the maximum or the minimum rated current is exceeded The following program segments show how to use the CURR UP or CURR DOWN command to increase or decrease the output current with the CURR ST command zal go VCURR STEP 0 01 Set the step size to 0 01 A CURR UP Increase the output current CURR STEP 0 02 Set the step size to 0 02 A CURR DOWN Decrease th
65. an R the output voltage will dominate since the current will be less then the current setting The power supply is said to be in constant voltage mode The load at point 1 has a relatively high resistance value compared to Ro the output voltage is at the voltage setting and the output current is less than the current setting In this case the power supply is in the constant voltage mode and the current setting acts as a current limit Vout A CV Operating Line Vmax 7 Vs Voltage setting value s ls Current setting value Re Vs Is Ru Load resistance CC Operating Line lout Is Imax Figure 7 5 Output Characteristics When the load R is less than R the output current will dominate since the voltage will be less than the set voltage The power supply is said to be in constant current mode The load at point 2 has a relatively low resistance the output voltage is less than the voltage setting the output current is at the current setting The supply is in constant current mode and the voltage setting acts as a voltage limit 144 Chapter 7 Tutorial Output Characteristics Unregulated State If the power supply should go into a mode of operation that is neither CV or CC the power supply is unregulated In this mode the output is not predictable The unregulated condition may be the result of the ac line voltage below the specifications The unregulated condition may occur momentarily
66. ation for specific procedures is located at the appropriate places in this manual See also Safety at the beginning of this manual for general safety information Safety and EMC Requirements This power supply is designed to comply with the following safety and EMC Electromagnetic Compatibility requirements e TEC 1010 1 1990 EN 61010 1 1998 A2 1995 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use e CSA C22 2 No 1010 1 92 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use e UL 1244 Electrical and Electric Measuring and Testing Equipment e EMC Directive 89 3836 EEC e Low Voltage Directive 73 23 EEC N 55011 1991 Group I Class A CISPR II 1990 Limits and Methods of adio Interface Characteristics of Industrial Scientific and Medical ISM adio Frequency Equipment N50082 1 1992 IEC 801 2 1991 Electrostatic Discharge Requirements IEC 801 3 1984 Radiated Electromagnetic Field Requirements TEC 801 4 1988 Electrical Fast Transient Burst Requirements e ICES NMB 001 This ISM device complies with Canadian ICES 001 Cet appareil ISM est conforme la norme NMB 001 du Canada E R R E Chapter 1 General Information Options and Accessories Options and Accessories Options Options 0EM OE3 and OE9 determine which power line voltage is selected at the factory The standard unit is configured for 115 Vac 10 47 63 Hz input v
67. aused the OVP trip is removed 86 Chapter 4 Remote Interface Reference Output Setting and Operation Commands VOLTage PROTection MINimum MAXimum This query returns the overvoltage protection trip level presently programmed VOLT PROT MAX and VOLT PROT MINreturn the maximum and minimum programmable overvoltage trip levels VOLTage PROTection STATe 0 1 OFF ON This command enables or disables the overvoltage protection function An overvoltage condition can be cleared with the VOLT PROT CLE command after the condition that caused the OVP trip is removed At RST this value is set to ON VOLTage PROTection STATe This query returns the state of the overvoltage protection function The returned parameter is 0 OFF or 1 ON VOLTage PROTection TRIPped This query returns a 1 if the overvoltage protection circuit is tripped and not cleared or a 0 if not tripped VOLTage PROTection CLEar This command causes the overvoltage protection circuit to be cleared After this command the output voltage is restored to the state it was in before the protection feature occurred and the OVP trip level remains unchanged to the value presently programmed Before sending this command lower the output voltage below the trip OVP point or raise the OVP trip level above the output setting VOLTage RANGe P15V P30V LOW HIGH This command selects an output range to be programmed by the identifier
68. cale Currnet Setting 470 uF 5 KQ 1 5 V msec Inductive loading Inductive loads present no loop stability problems in constant voltage mode In constant current mode inductive loads form a parallel resonance with the power supply s output capacitor Generally this will not affect the stability of the power supply but it may cause ringing of the current in the load Pulse Loading In some applications the load current varies periodically from a minimum to amaximum value The constant current circuit limits the output current Some peak loading exceeding the current limit can be obtained due to the output capacitor To stay within the specifications for the output the current limit should be set greater than the peak current expected or the supply may go into CC mode or unregulated mode for brief periods 149 Chapter 7 Tutorial Connecting the Load Reverse Current Loading An active load connected to the supply may actually deliver a reverse current to the supply during a portion of its operating cycle An external source can not be allowed to pump current into the supply without risking loss of regulation and possible damage These effects can be avoided by preloading the output with a dummy load resistor The dummy load resistor should draw at least the same amount of current from the supply as the active load may deliver to the supply The value of the current for the dummy load plus the value of the current the loa
69. calibration is unsecured and the output state is ON It sets the power supply to a calibration point that is entered with CAL VOLT command During calibration three points must be entered and the low end point MIN must be selected and entered first CALibration VOLTage PROTection This command calibrates the overvoltage protection circuit of the power supply It takes about 7 seconds to execute the command The calibration must be unsecured and the output be opened before calibrating the overvoltage protection circuit The power supply automatically performs the calibration and stores the new overvoltage constant in nonvolatile memory Notice that voltage calibration precedes before sending this command 98 Chapter 4 Remote Interface Reference RS 232 Interface Commands RS 232 Interface Commands Use the front panel I O Config key to select the baud rate parity and the number of data bits see chapter 3 Remote Interface Configuration starting on page 56 SYSTem LOCal This command places the power supply in the local mode during RS 232 operation All keys on the front panel are fully functional SYSTem REMote This command places the power supply in the remote mode for RS 232 operation All keys on the front panel except the Local key are disabled Itis very important that you send the SYST REM command to place the power supply in the remote mode Sending or receiving data over the RS 232 interfa
70. ce when not configured for remote operation can cause unpredictable results SYSTem RWLock This command places the power supply in the remote mode for RS 232 operation This command is the same as the SYST REM command except that all keys on the front panel are disabled including the Local key Ctrl C This command clears the operation in progress over the RS 232 interface and discards any pending output data This is equivalent to the IEEE 488 device clear action over the GPIB interface 99 Chapter 4 Remote Interface Reference The SCPI Status Registers The SCPI Status Registers All SCPI instruments implement status registers in the same way The status system records various instrument conditions in three register groups the Status Byte register the Standard Event register and the Questionable Status register groups The status byte register records high level summary information reported in the other register groups The diagram on the subsequent pages illustrates the SCPI status system used by the power supply What is an Event Register An event register is a read only register that reports defined conditions within the power supply Bits in an event register are latched Once an event bit is set subsequent state changes are ignored Bits in an event register are automatically cleared by a query of that register Such as ESR or STAT QUES EVEN or by sending the CLS clear status command
71. curity 66 Calibration Count 70 Calibration Message 70 Contents Chapter 4 Remote Interface Reference SCPI Command Summary 73 Simplified Programming Overview 78 Using the APPLy Command 78 Using the Low Level Commands 78 Reading a Query Response 79 Selecting a Trigger Source 79 Power Supply Programming Ranges 80 Using the APPLy Command 81 Output Setting and Operation Commands 82 Triggering Commands 89 Trigger Source Choices 89 Triggering Commands 91 System Related Commands 92 Calibration Commands 96 RS 282 Interface Commands 99 The SCPI Status Registers 100 What is an Event Register 100 What is an Enable Register 100 SCPI Status System 101 The Questionable Status Register 102 The Standard Event Register 103 The Status Byte Register 104 Using Service Request SRQ and Serial POLL 105 Using STB to Read the Status Byte 106 Using the Message Available Bit MAV 106 To Interrupt Your Bus Controller Using SRQ 106 To Determine When a Command Sequence is Completed 107 Using OPC to Signal When Data is in the Output Buffer 107 Status Reporting Commands 108 An Introduction to the SCPI Language 111 Command Format Used in This Manual 112 Command Separators 118 Using the MIN and MAX Parameters 113 Querying Parameter Settings 114 SCPI Command Terminators 114 IEEE 488 2 Common Commands 114 SCPI Parameter Types 115 Halting an Output in Progress 116 SCPI Conformance Information 117 IEEE 488 Conformance Information 120 11 2 e
72. d but could not be executed because the string length was more than 40 characters This error can be generated by the CALibration STRing command Illegal parameter value A discrete parameter was received which was not a valid choice for the command You may have used an invalid parameter choice Example DISP STAT XYZ XYZ is not a valid choice Self test failed The power supply s complete self test failed from the remote interface TST command In addition to this error more specific self test errors are also reported See also Self Test Errors starting on page 128 Too many errors The error queue is full because more than 20 errors have occurred No additional errors are stored until you remove errors from the queue The error queue is cleared when power has been off or after a CLS clear status command has been executed Query INTERRUPTED A command was received which sends data to the output buffer but the output buffer contained data from a previous command the previous data is not overwritten The output buffer is cleared when power has been off or after a RST reset command has been executed Query UNTERMINATED The power supply was addressed to talk i e to send data over the interface but a command has not been received which sends data to the output buffer For example you may have executed an APPLy command which does not generate data and then attempted an ENTER statement to read data from
73. d draws from the supply must be less than the maximum current of the supply 150 Chapter 7 Tutorial Extending the Voltage and Current Range Extending the Voltage and Current Range The power supply may be able to provide voltages and currents greater than its rated maximum outputs if the power line voltage is at or above its nominal value Operation can be extended up to 3 over the rated output without damage to the power supply but performance can not be guaranteed to meet specifications in this region Ifthe power line voltage is maintained in the upper end of the input voltage range the power supply will probably operate within its specifications The power supply is more likely to stay within specifications if only one of the voltage or current outputs is exceeded Series Connections Series operation of two or more power supplies can be accomplished up to the output isolation rating of any one supply to obtain a higher voltage than that available from a single supply Series connected power supplies can be operated with one load across both power supplies or with a separate load for each power supply The power supply has a reverse polarity diode connected across the output terminals so that if operated in series with other power supplies damage will not occur if the load is short circuited or if one power supply is turned on separately from its series partners When series connection is used the output voltage is the sum of
74. data in location 3 Cal checksum failed DAC cal constants Cal checksum failed readback cal constants Cal checksum failed GPIB address Cal checksum failed internal data Cal checksum failed DAC DNL error correction data 130 Application Programs Application Programs This chapter contains two application programs over the remote interface to help you develop programs for your own application Chapter 4 Remote Interface Reference starting on page 71 lists the syntax for the SCPI Standard Commands for Programmable Instruments commands available to program the power supply All program examples have been tested on a PC with Windows 3 1 or Windows for Workgroups Both examples are for use with GPIB IEEE 488 These examples require a VISA Virtual Instrument Software Architecture driver with your GPIB PC card You should have the visa dll in your windows system directory for the GPIB examples to work All program examples perform the same task They step through voltages and make corresponding current readings to characterize a power diode 132 Chapter 6 Application Programs C Example for GPIB IEEE 488 C Example for GPIB IEEE 488 This following C programming example shows sending and receiving formatted I O Also see your VISA user s guide for non formatted I O This example program is intended to show the use of SCPI commands and VISA functionality and does not include error trapping
75. described in this manual SCPI Confirmed Commands The following table lists the SCPI confirmed commands that are used by the power supply DISPlay WINDow STATe OFF ON WINDow STATe WINDow TEXT DATA lt quoted string gt WINDow TEXT DATA WINDow TEXT CLEar INITiate IMMediate MEASure CURRent DC VOLTage DC OUTPut STATe OFF ON STATE SOURce CURRent LEVel IMMediate AMPLitude lt current gt MIN MAX UP DOWN CURRent LEVel IMMediate AMPLitude MIN MAX CURRent LEVel IMMediate STEP INCRement lt numeric value gt DEFault CURRent LEVel IMMediate STEP INCRement DEFault CURRent LEVel TRIGgered AMPLitude lt current gt MIN MAX CURRent LEVel TRIGgered AMPLitude MIN MAX CURRent PROTection LEVel lt current gt MIN MAX CURRent PROTection LEVel MIN MAX CURRent PROTection STATe 0 1 OFF ON CURRent PROTection STATe CURRent PROTection TRIPped CURRent PROTection CLEar 117 Chapter 4 Remote Interface Reference SCPI Conformance Information SCPI Confirmed Commands continued SOURce VOLTage LEVel IMMediate AMPLitude lt voltage gt MIN MAX UP DOWN VOLTage LEVel IMMediate AMPLitude MIN MAX VOLTage LEVel IMMediate STEP INCRement lt numeric value gt DEFault VOLTage LEVel
76. e information on connecting the power supply to a computer over the RS 232 interface 56 Chapter 3 Front Panel Operation Remote Interface Configuration GPIB Address Each device on the GPIB IEEE 488 interface must have a unique address You can set the power supply s address to any value between 0 and 30 The current address is displayed momentarily on the front panel when you turn on the power supply The address is set to 05 when the power supply is shipped from the factory The GPIB address can be set from the front panel only e The address is stored in non volatile memory and does not change when power has been off or after a remote interface reset e Your GPIB bus controller has its own address Be sure to avoid the bus controller s address for any instrument on the interface bus Agilent Technologies controllers generally use address 21 Baud Rate Selection RS 232 You can select one of six baud rates for RS 232 operation The rate is set to 9600 baud when the power supply is shipped from the factory The baud rate can be set from the front panel only e Select one of the following 300 600 1200 2400 4800 9600 baud The factory setting is 9600 baud e The baud rate selection is stored in non volatile memory and does not change when power has been off or after a remote interface reset Parity Selection RS 232 You can select the parity for RS 232 operation The power supply is configur
77. e is set to ON CURRent PROTection STATe This query returns the state of the overcurrent protection function The returned parameter is 0 OFF or 1 ON CURRent PROTection TRIPped This query returns a 1 if the overcurrent protection circuit is tripped and not cleared or a 0 if not tripped CURRent PROTection CLEar This command causes the overcurrent protection circuit to be cleared After this command the output current is restored to the state it was in before the current protection tripped and the OCP trip level remains unchanged to the value presently programmed Before sending this command lower the output current below the trip OCP point or raise the OCP trip level above the output setting 84 Chapter 4 Remote Interface Reference Output Setting and Operation Commands VOLTage lt voltage gt MINimum MAXimum UP DOWN This command programs the immediate voltage level of the power supply The immediate level is the voltage value of the output terminals The VOLTage command changes the output of the power supply to the newly programmed value regardless of the output range presently selected You can substitute MINimum or MAXimum in place of a specific value for the voltage parameter MIN selects the lowest voltage values of 0 volts MAX selects the highest voltage values allowed for the selected range This command also increases or decreases the immediate voltage leve
78. e output current 82 Chapter 4 Remote Interface Reference Output Setting and Operation Commands CURRent MINimum MAXimum This query returns the presently programmed current level of the power supply CURR MAX and CURR MINreturn the highest and lowest programmable current levels for the selected range CURRent STEP lt numeric value gt DEFault This command sets the step size for current programming with the CURRent UP and CURRent DOWN commands See the example in the previous page To set the step size to the minimum resolution set the step size to DEFault The minimum resolution of the step size is approximately 0 12 mA The CURR STEP DEF returns the minimum resolution of your instrument The immediate current level increases or decreases by the value of the step size For example the output current will increase or decrease 10 mA if the step size is 0 01 This command is useful when you program the power supply to the allowed minimum resolution At RST the step size is the value of the minimum resolution CURRent STEP DEFault This query returns the value of the step size currently specified The returned parameter is a numeric value DEFault gives the minimum resolution of the step size in unit of amps CURRent TRIGgered lt current gt MINimum MAXimum This command programs the pending triggered current level The pending triggered current level is a stored value that is
79. e sure the adapter is a straight through type Typical adapters include gender changers null modem adapters and DB 9 to DB 25 adapters The cable and adapter diagrams shown below can be used to connect the power supply to most computers or terminals If your configuration is different than those described order the Agilent 34399A Adapier Kit This kit contains adapters for connection to other computers terminals and modems Instructions and pin diagrams are included with the adapter kit DB 9 Serial Connection If your computer or terminal has a 9 pin serial port with a male connector use the null modem cable included with the Agilent 34398A Cable Kit This cable has a 9 pin female connector on each end The cable pin diagram is shown below 5182 4794 Cable Instrument PC DCD 1 1 DCD RX 2 2 RX TX 3 ms 3 TX DTR 4 4 DTR GND 5 gt 5 GND DSR 6 6 DSR RTS 7 7 RTS CTS 8 8 CTS RI 9 9 RI DB9 DB9 DB9 DB9 Male Female Female Male 63 Chapter 3 Front Panel Operation RS 232 Interface Configuration DB 25 Serial Connection If your computer or terminal has a 25 pin serial port with a male connector use the null modem cable and 25 pin adapter included with the Agilent 34398A Cable Kit The cable and adapter pin diagram are shown below 5182 4794 5181 6641 Cable f Adapter J Instrument DCD 1 1 1 2 TX 3 lt lt 3 3 4 DTR 4 4 4 5
80. e the CLS clear status command e You query the event register using the ESR Event Status register command For example 28 4 8 16 is returned when you have queried the status of the Standard Event register QYE DDE and EXE conditions have occurred The Standard Event Enable register is cleared when e You execute the ESE 0 command e You turn on the power and have previously configured the power supply using the PSC 1 command e The enable register will not be cleared at power on if you have previously configured the power supply using the PSC 0 command The Status Byte Register The Status Byte summary register reports conditions from the other status registers Query data that is waiting in the power supply s output buffer is immediately reported through the Message Available bit bit 4 of Status Byte register Bits in the summary register are not latched Clearing an event register will clear the corresponding bits in the Status Byte summary register Reading all messages in the output buffer including any pending queries will clear the message available bit Table 4 4 Bit Definitions Status Byte Summary Register Bit Decimal Definition Value 0 2 Not Used 0 Always set to 0 3 QUES 8 One or more bits are set in the questionable status register bits must be enabled in the enable register MAV 16 Data is available in the power supply output b
81. e third conductor being the ground The power supply is grounded only when the power line cord is plugged into an appropriate receptacle Do not operate your power supply without adequate cabinet ground connection Power Line Voltage Selection Power line voltage selection is accomplished by adjusting two components power line voltage selector and power line fuse on the power line module of the rear panel To change the power line voltage proceed as follows 22 Chapter 1 General Information Input Power Requirements 1 Remove the power cord Remove the fuse holder assembly with a flat blad screwdriver from the rear panel 3 Rotate the power line voltage selector until the correct voltage appears 100 115 or 230 Vac 2 Install the correct line fuse Remove the power line voltage selector from the power line module 100 or 115 Vac 4 AT fuse 230 Vac 2 5 AT fuse 4 Replace the power line voltage selector and the fuse holder assembly in the rear m rs X NE cS 23 Chapter 1 General Information Input Power Requirements 24 Chapter 1 General Information Input Power Requirements 25 Initial Operation Initial Operation There are three basic tests in this chapter The automatic power on test includes a self test that checks the internal microprocessors and allows the user visually to check the display The output check ensures that the power supply develops its rated outputs and proper
82. ecifications Supplemental Characteristics 162 Index If you have questions relating to the operation of the power supply call 1 800 829 4444 in the United States or contact your nearest Alient Technologies Sales Office A accessories 15 active load 150 adapter kit Agilent 34399A 63 address GPIB 57 58 address GPIB bus controller 56 annunciators 5 application programs 132 138 asterisk 114 B basic tests output checkout 29 31 power on self test 28 preliminary checkout 27 battery charging 44 baud rate 57 62 bench operation 19 brace 73 112 bus controller interrupt 106 C cable crossover 63 DTE to DTE interface 63 modem eliminator 63 null modem 63 cable kit Agilent 34398A 63 64 calibration changing security code 69 count 70 error 129130 message 70 secure 68 security 66 security code 66 unsecure 67 calibration commands 96 98 character frame 62 checkout current output 30 output checkout 29 31 power on checkout 28 preliminary checkout 27 voltage output 29 colon 111 113 command CLS 109 ESE 109 ESR 109 IDN 94 OPC 107 109 OPC 109 PSC 109 PSC 110 RCL 95 RST 94 SAV 95 SRE 110 SRE 110 STB 106 110 TRG 91 TST 95 WAI 110 APPLy 81 APPLy 81 CALibration COUNt 96 CALibration CURRent 96 CALibration CURRent LEVel 96 CALibration CURRent PROTec tion 96 CALibration DAC ERRor
83. ecured you will see the above message for one second by holding the Calibrate key for 5 seconds when you turn on the power supply To unsecure the power supply press the Secure key after the CAL MODE message is displayed in the calibration mode enter the security code using the knob and resolution selection keys and then press the Secure key 000000 CODE When you press the Secure key to save the change you will see the message below for one second if the security code is correct The unsecured setting is stored in non volatile memory and does not change when power has been off or after a remote interface reset To exit the calibration mode turn the power off and on Notice that if the security is incorrect the power supply displays an INVALID message for a second and returns to the code entering mode for you to enter the correct code UNSECURED Remote Interface Operation CAL SEC STAT OFF ON lt code gt Secure or unsecure the power supply To unsecure the power supply send the above command with the same code used to secure For example CAL SEC STAT OFF HP003632 67 Chapter 3 Front Panel Operation Calibration Overview To Secure Against Calibration You can secure the power supply against calibration either from the front panel or over the remote interface The power supply is secured when shipped from the factory and the security code ts set to HP003632 Be sure
84. ed Device clear performs the following actions The power supply s input and output buffers are cleared The power supply is prepared to accept a new command string The following statement shows how to send a device clear over the GPIB interface using Agilent Technologies BASIC CLEAR 705 IEEE 488 Device Clear The following statement shows how to send a device clear over the GPIB interface using the GPIB Command Library for C or QuickBASIC OCLEAR 705 For RS 232 operation sending the lt Ctrl C gt character will perform the same operation as the L EEH 488 device clear message The power supply s DTR data terminal ready handshake line is set true following a device clear message See DTR DSR Handshake Protocol on page 64 in chapter 3 for further details All remote interface configurations can be entered only from the front panel See Remote Interface Configuration in chapter 3 to configure for GPIB or RS 232 interface before operating the power supply remotely 116 Chapter 4 Remote Interface Reference SCPI Conformance Information SCPI Conformance Information The Agilent E3632A Power Supply conform to the 1995 0 version of the SCPI standard Many of the commands required by the standard are accepted by the power supply but are not described in this manual for simplicity or clarity Most of these non documented commands duplicate the functionality of acommand already
85. ed for no parity and 8 data bits when shipped from the factory The parity can be set from the front panel only e Select one of the following None 8 data bits Even 7 data bits or Odd 7 data bits When you set the parity you are indirectly setting the number of data bits e The parity selection is stored in non volatile memory and does not change when power has been off or after a remote interface reset 57 I O Config I O Config I O Config Note Chapter 3 Front Panel Operation Remote Interface Configuration To Set the GPIB Address To configure the power supply for the GPIB interface proceed as follows Turn on the remote configuration mode GPIB 488 You will see the above message on the front panel display if the power supply has not been changed from the factory setting If RS 232 appears choose GPIB 488 by turning the knob to the right Move to the GPIB address setting mode ADDR 05 The address is set to 05 when the power supply is shipped from the factory Notice that a different GPIB address may appear if the power supply has been changed from the factory setting Turn the knob to change the GPIB address O The displayed address is changed when turning the knob to the right or left Save the change and turn off the I O configuration mode CHANGE SAVED The address is stored in non volatile memory and does not change when power has been off or
86. ed as soon as the command is executed The APPLy command changes the power supply s output to the newly programmed values only if the programmed values are valid within the presently selected range An execution error will occur if the programmed values are not valid within the selected range You can substitute MINimum MAXimum or DEFault in place of a specific value for the voltage and current parameters MIN selects the lowest values of 0 volts and 0 amps MAX selects the highest values allowed for the selected range The default values of voltage and current are 0 volts and 7 amps regardless of the presently selected range See Table 4 1 for details of parameters If you specify only one parameter of the APPLy command the power supply regards it as voltage setting value APPLy This command queries the power supply s present voltage and current setting values and returns a quoted string The voltage and current are returned in sequence as shown in the sample string below the quotation marks are returned as part of the string 15 00000 4 00000 In the above string the first number 15 00000 is the voltage setting value and the second number 4 00000 is the current setting value 81 CURRent Example Chapter 4 Remote Interface Reference Output Setting and Operation Commands Output Setting and Operation Commands This section describes low level commands used to progr
87. ed during operation self test and calibration or enables calibration mode the power supply must be unsecured before performing calibration See Service Guide for more details on calibration 1 0 Configuration Secure key Configures the power supply for remote interfaces or secure or unsecure the power supply for calibration See Service Guide for more details on how to secure or unsecure the power supply Output On Off key Enables or disables the power supply output This key toggles between on and off Control knob Increases or decreases the value of the blinking digit by turning clockwise or counter clockwise Resolution selection keys Move the blinking digit to the right or left Voltage current adjust selection key Selects the knob control function for voltage or current adjustment The key can be used as the Local key when the power supply is in the remote interface mode 2You can enable the calibration mode by holding down this key when you turn on the power supply SYou can use it as the Secure or Unsecure key when the power supply is in the calibration mode Front Panel Voltage and Current Limit Settings You can set the voltage and current limit values from the front panel using the following method Use the voltage current adjust selection key the resolution selection keys and the control knob to change the voltage and current limit values Volt 7 Current
88. egister OPC This command sets the Operation Complete bit bit 0 of the Standard Event register after the command is executed OPC This command returns 1 to the output buffer after the command is executed PSC 0 1 Power on status clear This command clears the Status Byte and the Standard Event register enable masks when power is turned on PSC 1 When PSC 0 is in effect the Status Byte and Standard Event register enable masks are not cleared when power is turned on 109 Chapter 4 Remote Interface Reference Status Reporting Commands PSC This command queries the power on status clear setting The returned parameter is 0 PSC 0 or I PSC 1 SRE lt enable value gt This command enables bits in the Status Byte enable register SRE This command queries the Status Byte Enable register The power supply returns a decimal value which corresponds to the binary weighted sum of all bits set in the register STB This command queries the Status Byte summaryregister The STB command is similar to a serial poll but it is processed like any other instrument command The STB command returns the same result as a serial poll but the Request Service bit bit 6 is not cleared if a serial poll has occurred WAI This command instructs the power supply to wait for all pending operations to complete before executing any additional commands over the interface Used only in t
89. er was found in the number specified for a parameter value Example ESE B01010102 Numeric overflow A numeric parameter was found whose exponent was larger than 32 000 Too many digits A numeric parameter was found whose mantissa contained more than 255 digits excluding leading zeros Numeric data not allowed A numeric parameter was received but a character string was expected Example DISP TEXT 123 Invalid suffix A suffix was incorrectly specified for a numeric parameter You may have misspelled the suffix Example TRIG DEL 0 5 SECS Suffix too long A suffix for a numeric parameter contained too many characters Suffix not allowed A suffix was received following a numeric parameter which does not accept a suffix Example STAT QUES ENAB 18 SEC SEC is not a valid suffix 124 Chapter 5 Error Messages Execution Errors 141 Invalid character data Either the character data element contained an invalid character or the particular element received was not valid for the header 144 Character data too long The character data element contained too many characters 148 Character data not allowed A discrete parameter was received but a character string or a numeric parameter was expected Check the list of parameters to verify that you have used a valid parameter type Example DISP TEXT ON 151 Invalid string data An invalid c
90. error code This routine requires the file VISA dll It typically resides under the directory c windows system This routine uses the VTL Library to send commands to an instrument A description of these and additional VTL commands are contained in the Hewlett Packard Visa Transition Library book Agilent PN E2094 90002 Function SendSCPI SCPICmd As String As String This function will send a SCPI command string to the GPIB port If the command contains a question mark the response is read and returned Dim readbuf As String 512 buffer used for returned string Dim crlfpos As Integer location of CR s and LF s in readbuf Dim cmdString As String command passed to instrument Dim ReturnString As String string returned from instrument Dim actual As Long number of characters send returned Set up an error handler within this subroutine that will get called if an error occurs On Error GoTo VIerrorHandler Write the command to the instrument terminated by a linefeed cmdstring SCPICmd amp Chr 10 errorStatus viWrite vi ByVal commandstr Len commandstr actual 137 Chapter 6 Application Programs Excel 5 0 Example for Windows 3 1 and GPIB continued If InStr SCPICmd Then If a query read the response string errorStatus viRead vi ByVal readbuf 512 actual ReturnString readbuf Strip out any nul s from the response string crlfpos InStr ReturnString Chr 0 If crlfpo
91. eter mode Meter mode means that the display shows the actual output voltage and current Check that the front panel voltmeter properly responds to knob control for the 15V 7A range Turn the knob clockwise or counter clockwise to check that the voltmeter responds to knob control and the ammeter indicates nearly zero Ensure that the voltage can be adjusted from zero to the full rated value Adjust the knob until the voltmeter indicates 0 volts and then adjust the knob until the voltmeter indicates 15 0 volts lYou can use the resolution selection keys to move the blinking digit to the right or left when setting the voltage 29 Power Output On Off Display Limit Volt Curr Chapter 2 Initial Operation Output Checkout Current Output Checkout The following steps check basic current functions with a short across the power supply s output Turn on the power supply The power supply will go into the power on reset state the output is disabled the OFF annunciator turns on the 15V 7A range is selected the 15V annunciator turns on and the knob is selected for voltage control Connect a short across and output terminals with an insulated test lead Enable the output The OFF annunciator turns off and the 15V OVP and OCP annunciators are lit The CV or CC annunciator turns on depending on the resistance of the test lead The blinking digit can be adjusted by t
92. f 1 is returned the power supply is in the CC operating mode and if 2 is returned the power supply is in the CV operating mode If 3 is returned the power supply is in failure STATus QUEStionable This command queries the Questionable Status event register The power supply returns a decimal value which corresponds to the binary weighted sum of all bits in the register These bits are latched Reading the event register clears it 108 Chapter 4 Remote Interface Reference Status Reporting Commands STATus QUEStionable ENABle lt enable value gt This command enables bits in the Questionable Status enable register The selected bits are then reported to the Status Byte STATus QUEStionable ENABle This command queries the Questionable Status enable register The power supply returns abinary weighted decimal representing the bits set in the enable register CLS This command clears all event registers and Status Byte register ESE lt enable value gt This command enables bits in the Standard Event enable register The selected bits are then reported to the Status Byte ESE This command queries the Standard Event enable register The power supply returns a decimal value which corresponds to the binary weighted sum of all bits in the register ESR This command queries the Standard event register The power supply returns a decimal value which corresponds to the binary weighted sum of all bits in the r
93. frame consists of all the transmitted bits that make up a single character The frame is defined as the characters from the start bit to the last stop bit inclusively Within the frame you can select the baud rate number of data bits and parity type The power supply uses the following frame formats for seven and eight data bits PARITY EVEN opp Strt 7 Data Parity Stop Stop Bit Bits Bit Bit Bit Start 8 Data Stop Stop Bit Bits Bit Bit PARITY NONE 62 Chapter 3 Front Panel Operation RS 232 Interface Configuration Connection to a Computer or Terminal To connect the power supply to a computer or terminal you must have the proper interface cable Most computers and terminals are DTE Data Terminal Equipment devices Since the power supply is also a DTE device you must use a DTE to DTE interface cable These cables are also called null modem modem eliminator or crossover cables The interface cable must also have the proper connector on each end and the internal wiring must be correct Connectors typically have 9 pins DB 9 connector or 25 pins DB 25 connector with a male or female pin configuration A male connector has pins inside the connector shell and a female connector has holes inside the connector shell If you cannot find the correct cable for your configuration you may have to use a wiring adapter If you are using a DTE to DTE cable mak
94. hapter 8 Specifications Supplemental Characteristics Supplemental Characteristics Output Programming Range maximum programmable values Low range 0 to 15 45 V O to 7 21A High range 0 to 30 9 V O to 4 12 A OVP 1Vto 32V OCP OAtO7 5A Remote Sensing Capability Voltage drop Up to 1 V per each lead Load regulation Add 5 mV to spec for each 1 volt change in the output lead due to load current changes Load voltage Subtract voltage drop in load leads from specified output voltage rating Temperature Coefficient of output offset Maximum change in output readback per C after a 30 minute warm up Voltage 0 01 3 mV Current 0 02 3 mA Stability of output offset Following 1 hour warm up change in output over 8 hours under constant load line and ambient temperature Voltage 0 02 1 mV Current 0 1 1 MA Voltage Programming Speed Maximum time required for output voltage to settle within 1 of its total excursion for resistive load Excludes command processing time Full load No laod Up 50 msec 20 msec Down 45 msec 400 msec 159 Chapter 8 Specifications Supplemental Characteristics Output Terminal Isolation maximum from chassis ground 60 Vdc when connecting shorting conductors without insulation to the output to the sense and the output and the sense terminals 240 Vde when connecting insulated shorting conductors to the output to the sense and the out
95. haracter string was received Check to see if you have enclosed the character string in single or double quotes Example DISP TEXT ON 158 String data not allowed A character string was received but is not allowed for the command Check the list of parameters to verify that you have used a valid parameter type Example TRIG DEL zero 160 to 168 Block data errors The power supply does not accept block data 170 to 178 Expression errors The power supply does not accept mathematical expressions 211 Trigger ignored A Group Execute Trigger GET or TRG was received but the trigger was ignored Make sure that the trigger source should be selected to the bus and the trigger subsystem should be initiated by INIT IMM command 213 Init ignored An INITiate command was received but could not be executed because a measurement was already in progress Send a device clear to halt a measurement in progress and place the power supply in the idle state 125 221 222 223 224 330 350 410 420 Chapter 5 Error Messages Execution Errors Settings conflict Indicates that a legal program data element was parsed but could not be executed due to the current device state Data out of range A numeric parameter value is outside the valid range for the command Example TRIG DEL 3 Too much data A character string was receive
96. he triggered mode 110 Chapter 4 Remote Interface Reference An Introduction to the SCPI Language An Introduction to the SCPI Language SCPI Standard Commands for Programmable Instruments is an ASCII based instrument command language designed for test and measurement instruments Refer to Simplified Programming Overview starting on page 78 for an introduction to the basic techniques used to program the power supply over the remote interface SCPI commands are based on a hierarchical structure also known as a tree system In this system associated commands are grouped together under a common node or root thus forming subsystems A portion of the SOURce subsystem is shown below to illustrate the tree system SOURce CURRent lt current gt MIN MAX UP DOWN CURRent MIN MAX CURRent TRIGgered lt current gt MIN MAX TRIGgered MIN MAX VOLTage lt voltage gt MIN MAX UP DOWN VOLTage MIN MAX VOLTage TRIGgered lt voltage gt MIN MAX TRIGgered MIN MAX SOURce is the root keyword of the command CURRent and VOLTage are second level keywords and TRIGgered is third level keywords A colon separates a command keyword from a lower level keyword 111 Chapter 4 Remote Interface Reference An Introduction to the SCPI Language Command Format Used in This Manual The format used to show commands in this manual is shown below CURRent l
97. ify that the power supply and your computer are configured for the same baud rate parity and number of data bits Make sure that your computer is set up for 1 start bit and 2 stop bits these values are fixed on the power supply e Make sure to execute the SYSTem REMote command to place the power supply in the remote mode e Verify that you have connected the correct interface cable and adapters Even if the cable has the proper connectors for your system the internal wiring may be incorrect The Agilent Technologies 34398A Cable Kit can be used to connect the power supply to most computers or terminals e Verify that you have connected the interface cable to the correct serial port on your computer COM1 COM2 etc 65 Chapter 3 Front Panel Operation Calibration Overview Calibration Overview This section gives an overview of the calibration features of the power supply For more detailed discussion of the calibration procedures see the Service Guide Calibration Security This feature allows you to enter a security code to prevent accidental or unauthorized calibrations of the power supply When you first receive your power supply it is secured Before you can calibrate the power supply you must unsecure it by entering the correct security code e The security code is set to HP003632 when the power supply is shipped from the factory The security code is stored in non volatile memory and does not change
98. indicate that this portion of the command is optional Most optional portions of the command are not shown in the command description For the full command showing all the options see SCPI Command Summary starting on page 73 A colon separates a command keyword from a lower level keyword You must insert a blank space to separate a parameter from a command Keyword If a command requires more than one parameter you must separate adjacent parameter using a comma as shown below SOURcCe CURRent TRIGgered APPLY 3 5 1 5 112 Chapter 4 Remote Interface Reference An Introduction to the SCPI Language Command Separators A colon is used to separate a command keyword from a lower level keyword as shown below SOURce CURRent TRIGgered A semicolon is used to separate two commands within the same subsystem and can also minimize typing For example sending the following command string SOUR VOLT MIN CURR MAX is the same as sending the following two commands SOUR VOLT MIN SOUR CURR MAX Use a colon and a semicolon to link commands from different subsystems For example in the following command string an error is generated if you do not use the colon and semicolon D SP T EXT CL E SOUR CURR MIN Using the MIN and MAX Parameters You can substitute M1 commands For example consider the following command CURRent lt cu
99. ine FALSE This implies that once a query has been sent to the power supply the bus controller should read the response before attempting to send more data It also means that a lt new line gt must terminate the command string After the response has been output the power supply sets the DTR line TRUE again unless the first case see above prevents this The power supply monitors the DSR line to determine when the bus controller is ready to accept data over the interface The power supply monitors the DSR line pin 6 on the RS 232 connector before each character is sent The output is suspended if the DSR line is FALSE When the DSR line goes TRUE transmission will resume The power supply holds the DTR line FALSE while outputis suspended A form of interface deadlock exists until the bus controller asserts the DSR line TRUE to allow the power supply to complete the transmission You can break the interface deadlock by sending the lt Ctrl C gt character which clears the operation in progress and discards pending output this is equivalent to the TEEE 488 device clear action For the lt Ctrl C gt character to be recognized reliably by the power supply while it holds DTR FALSE the bus controller must first set DSR FALSE RS 232 Troubleshooting Here are a few things to check if you are having problems communicating over the RS 282 interface If you need additional help refer to the documentation that came with your computer e Ver
100. initiate 79 Chapter 4 Remote Interface Reference Simplified Programming Overview Power Supply Programming Ranges The SOURce subsystem requires parameters for programming values The available programming value for a parameter varies according to the desired output range of the power supply The following table lists the programming values available and MINimum MAXimum DEFault and reset values of the Agilient E3632A power supply Refer to this table to identify programming values when programming the power supply Table 4 1 Agilent E3632A Programming Ranges 0 15V 7A Range 0 30V 4A Range Voltage Programming Range O V to 15 45V 0 V to 30 9 V MAX Value 15 45 V 30 9 V MIN Value OV OV DEFault Value OV OV RST Value OV Current Programming Range OAto7 21A OA to 4 12 A MAX Value 7 21 A 4 12 A MIN Value OA OA DEFault Value 7A 4A RST 7A 80 Chapter 4 Remote Interface Reference Using the APPLy Command Using the APPLy Command The APPLy command provides the most straightforward method to program the power supply over the remote interface You can select the output voltage and current in one command APPLy lt voltage gt DEF MIN MAX lt current gt DEF MIN MAX This command is combination of VOLTage and CURRent commands As long as the newly programmed values are within the presently selected range the output voltage and current are chang
101. interface CALibration SECure STATe This command queries the secured state for calibration of the power supply The returned parameter is 0 OFF or 1 ON CALibration STRing lt quoted string gt This command records calibration information about your power supply For example you can store such information as the last calibration date the next calibration due date or the power supply s serial number The calibration message may contain up to 40 characters The power supply should be unsecured before sending a calibration message CALibration STRing This command queries the calibration message and returns a quoted string CALibration VOLTage DATA lt numeric value gt This command can only be used after calibration is unsecured and the output state is ON It enters a voltage value that you obtained by reading an external meter You must first select the minimum calibration level CAL VOLT LEV MIN for the value being entered You must then select the middle and maximum calibration levels CAL VOLT LEV MIDand CAL VOLT LEV MAX for the value being entered Three successive values must be selected and entered The power supply then computes new voltage calibration constants These constants are then stored in non volatile memory 97 Chapter 4 Remote Interface Reference Calibration Commands CALibration VOLTage LEVel MINimum MIDdle MAXimum This command can only be used after
102. ion 120 initial inspection 19 electrical check 19 mechanical check 19 input power 22 23 input power selection 22 installation 19 21 interface GPIB 56 interface RS 232 56 K key Calibrate 67 68 Display Limit 35 VO Config 6 Local 35 On Off 35 50 Secure 67 69 key descriptions 3 keyword root 111 second level 111 third level 111 knob locking 50 51 L limit mode 17 35 line fuse 22 linear power supplies 141 load active 150 capacitive loading 149 inductive loading 149 pulse loading 149 reverse current loading 150 locking knob control 50 51 loop stability 149 low level commands 78 M MAV bit 106 MAX parameter 113 memory locations 95 message CAL MODE 67 69 meter mode 17 28 MIN parameters 113 multiple loads 147 N noise common mode current 145 normal mode voltage 145 non SCPI commands 119 O OCP programming enable OCP 45 OCP programming 45 47 check OCP operation 46 clear OC condition 46 trip level setting 45 operating range 151 operation overview 141 142 options 15 output buffer 104 107 output characteristics 143 146 output identifier 80 output impedance 143 output isolation 147 output Off state 50 output setting commands 82 88 OVP programming 42 44 check OVP Operation 43 clear OV condition 43 enabling OVP 42 trip level setting 42 164 Index P parameter boolean 115 discrete 115 numeric 115 string
103. is shown on the display the OVP annunciator blinks When it was caused by external voltage source such as a battery disconnect it first The following steps show how to clear the overvoltage conditions and get back to normal mode operation In the following steps the display will go back to OVP TRIPPED if you let the display time out after about several seconds Readjust the OVP trip level or the output voltage level O Lower the output voltage level below the OVP trip point after pressing the Display Limit or raise the OVP trip level by using the knob after pressing the Over Voltage key Move to the clear mode f ovp on You will see the above message after pressing the Over Voltage key If you changed the output voltage level press the Over Voltage key twice Turn the knob to the right until the OVP CLEAR appears on the display 43 Over Voltage Note Chapter 3 Front Panel Operation Programming Overvoltage Protection Clear the overvoltage condition and exit this menu Now when you press Over Voltage key again the DONE message is displayed for a second and the OVP annunciator will not blink any more The output will return to meter mode Remote interface operation VOLT PROT lt voltage gt MIN MAX Set the OVP level VOLT PROT STAT OFF ON Disable or enable the OVP circuit VOLT PROT CLE Clear the tripped OVP circuit The power supply s OVP circuit contains a
104. it 5 of Status Byte register through the enable register To set the enable register mask you write a decimal value to the register using the ESE Event Status Enable command An error condition Standard Event register bit 2 3 4 or 5 will always record one or more errors in the power supply s error queue Read the error queue using the SYST ERR command Table 4 3 Bit Definitions Standard Event Register Bit Decimal Definition Value 0 OPC 1 Operation Complete All commands prior to and including an OPC command have been executed Not Used 0 Always set to 0 2 QYE Query Error The power supply tried to read the output 4 buffer but it was empty Or new command line was received before a previous query had been read Or both the input and output buffers are full 3 DDE 8 Device Error A self test or calibration error occurred see error numbers 601 through 750 in chapter 5 4 EXE 16 Execution Error An execution error occurred see error numbers 211 through 224 in chapter 5 5 CME 32 Command Error A command syntax error occurred see error numbers 101 through 178 in chapter 5 Not Used 0 Always set to 0 PON 128 Power On Power has been turned off and on since the last time the event register was read or cleared 103 Chapter 4 Remote Interface Reference The SCPI Status Registers The Standard Event register is cleared when e You execut
105. l can be grounded at the output terminal Alternately any impedances to earth ground should have a complementary impedance to earth ground to cancel any generated voltages If the circuit is not referenced to earth ground common mode power line noise is typically not a problem The output will also change due to changes in the load As the load increases the output current will cause a small drop in the output voltage of the power supply due to the output impedance R Any resistance in the connecting wire will add to this resistance and increase the voltage drop Using the largest possible hook up wire will minimize the voltage drop Using the remote sense leads at the load will compensate for lead resistance in the load leads 145 Chapter 7 Tutorial Output Characteristics NORMAL MODE NOISE R O lt 2 mVpp lt 350 uVrms OUTPUT OUTPUT al te TERMINAL VOLTAGE T COMMON MODE i NOISE Wee lt 1 5 uArms HLT Figure 7 6 Simplified Diagram of Common Mode and Normal Mode Sources of Noise When the load changes very rapidly as when a relay contact is closed the inductance in the hook up wire and in the power supply output will cause a spike to appear at the load The spike is a function of the rate of change of the load current When very rapid changes in load are expected a capacitor with alow series resistance in parallel with the power supply and close to the load is the best way to minimize these
106. l using the UP or DOWN parameter by a predetermined amount The command VOLTage STEP sets the amount of increase or decrease Notice that anew increment setting will cause an execution error 222 Data out of range when the maximum or the minimum rated voltage is exceeded VOLTage The following program segments show how to use the VOLT UP or Example VOLT DOWN command to increase or decrease the output voltage with the VOLT STEP command VOLT STEP 0 01 Set the step size to 0 01 V VOLT UP Increase the output voltage VOLT STEP 0 02 Set the step size to 0 02 V VOLT DOWN Decrease the output voltage VOLTage MINimum MAXimum This query returns the presently programmed voltage level of the power supply VOLT MAX and VOLT MIN return the highest and lowest programmable voltage levels for the selected range 85 Chapter 4 Remote Interface Reference Output Setting and Operation Commands VOLTage STEP lt numeric value gt DEFault This command sets the step size for voltage programming with the VOLT UP and VOLT DOWN commands See the above example in the previous page To set the step size to the minimum resolution set the step size to DEFault The minimum resolution of the step size is approximately 0 55 mV The VOLT STEP DEF returns the minimum resolution of your instrument The immediate voltage level increases or decreases by the value of the step size For example the output
107. lling two jumpers inside the power supply See the Service Guide for more information Do not use the RS 232 interface if you have configured the power supply to output relay control signals Internal components on the RS 232 circuitry may be damaged OUTPut RELay This command returns the state of the TTL relay logic signals See also OUTP REL command SYSTem BEEPer This command issues a single beep immediately SYSTem ERRor This command queries the power supply s error queue When the front panel ERROR annunciator turns on one or more command syntax or hardware errors have been detected Up to 20 errors can be stored in the error queue See Error Messages for a complete listing of the errors in chapter 5 e Errors are retrieved in first in first out FIFO order The first error returned is the first error that was stored When you have read all errors from the queue the ERROR annunciator turns off The power supply beeps once each time an error is generated e Ifmore than 20 errors have occurred the last error stored in the queue the most recent error is replaced with 350 Too many errors No additional errors are stored until you remove errors from the queue If no errors have occurred when you read the error queue the power supply responds with 0 No error e The error queue is cleared when power has been off or after a CLS clear status command has been executed The RST reset command does no
108. lso turn on Enable the outputs Press the Output On Off key to enable the output The OFF annunciator turns off and the 15V OVP OCP and CV annunciators are lit The blinking digit can be adjusted by turning the knob Notice that the display is in the meter mode Meter mode means that the display shows the actual output voltage and current If the power supply detects an error during power on self test the ERROR annunctator will turn on See Error Messages for more information starting on page 121 in chapter 5 28 Power Output On Off w Chapter 2 Initial Operation Output Checkout Output Checkout The following procedures check to ensure that the power supply develops its rated outputs and properly responds to operation from the front panel For complete performance and verification tests refer to the Service Guide For each step use the keys shown on the left margins Voltage Output Checkout The following steps verify basic voltage functions with no load Turn on the power supply The power supply will go into the power on reset state the output is disabled the OFF annunciator turns on the 15V 7A range is selected the 15V annunciator turns on and the knob is selected for voltage control Enable the outputs The OFF annunciator turns off and the 15V OVP OCP and CV annunciators are lit The blinking digit can be adjusted by turning the Knob Notice that the display is in the m
109. ly forces the power supply to lose regulation the Unreg annunciator will turn on to indicate that the output is unregulated Output Noise Any noise picked up on the sense leads also appears at the output of the power supply and may adversely affect the voltage load regulation Twist the sense leads to minimize external noise pickup and run them parallel and close to the load leads In noisy environments it may be necessary to shield the sense leads Ground the shield at the power supply end only Do not use the shield as one of the sense conductors 48 Note Note Chapter 3 Front Panel Operation Remote Voltage Sensing Stability Using remote sensing under certain combinations of load lead lengths and large load capacitances may cause your application to form a filter which becomes part of the voltage feedback loop The extra phase shift created by this filter can degrade the power supply s stability resulting in poor transient response or loop instability In severe cases it may cause oscillations To minimize this possibility keep the load leads as short as possible and twist them together As the sense leads are part of the power supply s programming feedback loop accidental open connections of sense or load leads during remote sensing operation have various unwanted effects Provide secure and permanent connections Remote Voltage Sensing Connections Remote voltage sensing requires connecting the load lead
110. ly responds to operation from the front panel For complete performance and or verification tests refer to the Service Guide This chapter is intended for both the experienced and the inexperienced user because it calls attention to certain checks that should be made prior to operation Throughout this chapter the key to be pressed is shown in the left margin 26 w Chapter 2 Initial Operation Preliminary Checkout Preliminary Checkout The following steps help you verify that the power supply is ready for use Verify the power line voltage setting on the rear panel The power line voltage is set to the proper value for your country when the power supply is shipped from the factory Change the voltage setting if it is not correct The settings are 100 115 or 230 Vac Verify that the correct power line fuse is installed The correct fuse is installed for your country when the power supply is shipped from the factory For 100 or 115 Vac operation you must use a 4 AT fuse For 230 Vac operation you must use a 2 5 AT fuse Connect the power line cord and turn on your power supply The front panel display will light up and a power on self test occurs automatically when you turn on the power supply See Power Line Voltage Selection starting on page 22 in chapter 1 if you need to change the power line voltage or the power line fuse To replace the 4 AT fuse order Agilent part number 2110 0996 To re
111. mation and replace ment pages which you merge into the manual The dates on this page change only when a new edition is published Trademark Information Windows Windows 95 and Windows NT are registered trademarks of Microsoft Corp Certification Agilent Technologies certifies that this product met its published specifica tions at the time of ship ment Agilent further certifies that its calibration measurements are trace able to the United States National Institute of Stan dards and Technology for merly National Bureau of Standards to the extent allowed by that organiza tion s calibration facility and to the calibration facili ties of other International Standards Organization members Warranty This Agilent product is war ranted against defects in materials and workmanship for a period of one year from date of shipment Duration and conditions of warranty for this product may be superseded when the prod uct is integrated into becomes a part of other Agilent products During the warranty period Agilent will at its option either repair or replace products which prove to be defective The warranty period begins on the date of delivery or on the date of installation if installed by Agilent Warranty Service For warranty service or repair this product must be returned to a service facility designated by Agilent For products returned to Agilent for warranty service the Buyer shall
112. n complete query command and enter the result to ensure synchronization Execute your command string to program the desired configuration and then execute the OPC operation complete command as the last command When the command sequence is completed the operation complete bit bit 0 is set in the Standard Event register Use a serial poll to check to see when bit 5 standard event is set in the Status Byte summary register You could also configure the power supply for an SRQ interrupt by sending SRE 32 Status Byte enable register bit 5 Using OPC to Signal When Data is in the Output Buffer Generally it is best to use the operation complete bit bit 0 in the Standard Event register to signal when a command sequence is completed This bit is set in the register after an OPC command has been executed If you send OPC after a command which loads a message in the power supply s output buffer query data you can use the operation complete bit to determine when the message is available However if too many messages are generated before the OPC command executes sequentially the output buffer will fill and the power supply will stop processing commands 107 Chapter 4 Remote Interface Reference Status Reporting Commands Status Reporting Commands See diagram SCPI Status System on page 101 in this chapter for detailed information of the status register structure of the power
113. n the front panel If the self test fails FAIL is displayed and the ERROR annunciator turns on See the Service Guide for instructions on returning the power supply to Agilent Technologies for service Front panel operation The complete self test is enabled by pressing the Recal1 the actually any front panel keys except the Error key and the power line switch simultaneously and then continuing to press the Reca11 key for 5 seconds The complete self test will be finished in 2 seconds Remote interface operation TST Returns O if the complete self test passes or 1 if it fails 52 Chapter 3 Front Panel Operation System Related Operations Error Conditions When the front panel ERROR annunciator turns on one or more command syntax or hardware errors have been detected A record of up to 20 errors can be stored in the power supply s error queue See chapter 5 Error Messages starting on page 121 for a complete listing of the errors Errors are retrieved in first in first out FIFO order The first error returned is the first error that was stored When you have read all errors from the queue the ERROR annunciator turns off The power supply beeps once each time an error is generated If more than 20 errors have occurred when you operate the power supply over the remote interface the last error stored in the queue the most recent error is replaced with 350 Too many errors
114. nel Operation Constant Current Operation Constant Current Operation To set up the power supply for constant current CC operation proceed as follows Front panel operation Connect a load to the output terminals With power off connect a load to the and output terminals Turn on the power supply The power supply will go into the power on reset state the output is disabled the OFF annunciator turns on the 15V 7A range is selected the 15V annunciator turns on and the Knob is selected for voltage control To operate the power supply in the 30V 4A range press 30V 4A key before proceeding to the next step The 30V annunciator turns on Set the display to the limit mode Notice that the Limit annunciator blinks indicating that the display is in the limit mode When the display is in the limit mode you can see the voltage and current limit values of the selected supply Inconstant current mode the current values between the meter mode and limit mode are the same but the voltage values are not Moreover if the display is in the meter mode you cannot see the change of voltage limit value when adjusting the knob We recommend that you should set the display to limit mode to see the change of voltage limit value in the constant current mode whenever adjusting the knob Adjust the knob for the desired voltage limit Q Check that the Limit annunciator still blinks and the second digit
115. nt E8632A DC power supply e Overview of Agilent E3632A Operation page 141 e Output Characteristics page 143 e Connecting the Load page 147 e Extending the Voltage and Current Range page 151 e Remote Programming page 152 e Remote Programming page 152 140 Chapter 7 Tutorial Overview of Agilent E3632A Operation Overview of Agilent E3632A Operation Series regulated power supplies were introduced many years ago and are still used extensively today The basic design technique which has not changed over the years consists of placing a control element in series with the rectifier and load device Figure 7 1 shows a simplified schematic of a series regulated supply with the series element depicted as a variable resistor Feedback control circuits continuously monitor the output and adjust the series resistance to maintain a constant output voltage Because the variable resistance of Figure 7 1 is actually one or more power transistor operating in the linear class A mode supplies with this type of regulator are often called linear power supplies Linear power supplies have many advantages and usually provide the simplest most effective means of satisfying high performance and low power requirements RECTIFIER POWER TRANSFORMER Figure 7 1 Diagram of Simple Series Power Supply with Tap Selection To keep the voltage across the series resistance low some supplies use preregulation before the rectifier bridge Figure
116. nunciator turns off and the display will go to the meter mode Over Current 3 Enter the OCP menu and set the trip level O LEVEL 7 5 A You will see the above message on the display when you enter the OCP menu Adjust the knob for the desired OCP trip level Over Current 4 Enable the OCP circuit OCP ON You will see the above message after pressing the Over Current key 45 Over Current Over Current Display Limi or Chapter 3 Front Panel Operation Programming Overcurrent Protection Exit the OCP menu CHANGED The CHANGED message is displayed for asecond to show that the new OCP trip level is now in effect If the OCP settings are not changed NO CHANGE will be displayed The power supply will exit the OCP menu and the display will return to the meter mode Check that the OCP annunciator turns on Checking OCP Operation To check OCP operation raise the output current to near the trip point Then very gradually increase the output by turning the knob until the OCP circuit trips This will cause the power supply s output current to drop to zero and the OCP annunciator to blink The OCP TRIPPED message also appears on the display Clearing the Overcurrent Condition When the OCP condition occurs the OCP TRIPPED message is shown on the display the OCP annunciator blinks When it was caused by external voltage source such as a battery disconnect it fir
117. nvalid separator was found in the command string You may have used a comma instead of a colon semicolon or blank space or you may have used a blank space instead of a comma Example TRI pL BUS or APPL 1 0 1 0 G SOUR Data type error The wrong parameter type was found in the command string You may have specified a number where a string was expected or vice versa GET not allowed A Group Execute Trigger GET is not allowed within a command string Parameter not allowed More parameters were received than expected for the command You may have entered an extra parameter or you added a parameter to a command that does not accept a parameter APPL 10 Example Missing parameter Fewer parameters were received than expected for the command You omitted one or more parameters that are required for this command APPL Example 123 112 113 121 123 124 128 131 134 138 Chapter 5 Error Messages Execution Errors Program mnemonic too long A command header was received which contained more than the maximum 12 characters allowed Undefined header A command was received that is not valid for this power supply You may have misspelled the command or it may not be a valid command If you are using the short form of the command remember thatit may contain up to four letters Example TRIGG DEL 3 Invalid character in number An invalid charact
118. o noisy Serial configuration readback failed Unable to sense line frequency I O processor does not respond I O processor failed self test Fan test failed System DAC test failed Hardware test failed 128 701 702 703 704 705 708 712 713 Chapter 5 Error Messages Calibration Errors Calibration Errors The following errors indicate failures that may occur during a calibration Refer to the Service Guide for more information Cal security disabled by jumper The calibration security feature has been disabled with a jumper inside the power supply When applicable this error will occur at power on to warn you that the power supply is unsecured Cal secured The power supply is secured against calibration Invalid secure code Aninvalid calibration security code was received when attempting to unsecure or secure the power supply You must use the same security code to unsecure the power supply as was used to secure it and vice versa The security code may contain up to 12 alphanumeric characters The first character must be a letter Secure code too long A security code was received which contained more than 12 characters Cal aborted A calibration in progress is aborted when you press any front panel key send a device clear or change the local remote state of the instrument Cal output disabled Calibration is aborted by sending OUTP OFF command during calibrating a output Bad DAC cal dat
119. ocessor You can query the firmware revision from the remote interface only The power supply returns four fields separated by commas and the fourth field is arevision code which contains three numbers The first number is the firmware revision number for the main processor the second is for the input output processor and the third is for the front panel processor Remote interface operation IDN Returns HEWLETT PACKARD E3632A 0 X X X X X X Be sure to dimension a string variable with at least 40 characters SCPI Language Version The power supply complies with the rules and regulations of the present version of SCPI Standard Commands for Programmable Instruments You can determine the SCPI version with which the power supply is in compliance by sending a command from the remote interface You can query the SCPI version from the remote interface only Remote interface operation SYST VERS Query the SCPI version Returns a string in the form YYYY V where the Y s represent the year of the version and the V represents a version number for that year for example 1995 0 55 Chapter 3 Front Panel Operation Remote Interface Configuration Remote Interface Configuration Before you can operate the power supply over the remote interface you must configure the power supply for the remote interface This section gives information on configuring the remote interface
120. of voltmeter blinks to indicate the knob is selected for voltage control The blinking digit can be changed using the resolution keys and the blinking digit can be adjusted by turning the knob Adjust the knob for the desired voltage limit lYou can use the resolution selection keys to move the blinking digit to the right or left when setting the voltage 38 Volt Curr Display Limit Output On Off Note Chapter 3 Front Panel Operation Constant Current Operation Adjust the knob for the desired output current ol oy Check that the Limit annunciator still blinks Set the knob for current control The second digit of the ammeter will be blinking Change the blinking digit using the resolution selection keys and adjust the knob to the desired output current Return to the meter mode Press Display Limit Key or let the display time out after several seconds to return the meter mode Notice that the Limit annunciator turns off and the display shows OUTPUT OFF message Enable the output The OFF annunciator turns off and the 15V or 30V OVP OCP and CC annunciators are lit Notice that the display is in the meter mode In the meter mode the display shows the actual output voltage and current Refer to Programming Overvoltage Protection and Programming Overcurrent Protection sections starting on page 42 and page 45 for more information on OVP and OCP annunciators Verify that the powe
121. oltage For more information about changing the power line voltage setting see Power Line Voltage Selection starting on page 22 in this chapter Option Description 0EM 115 Vac 10 47 63 Hz input voltage 0E3 230 Vac 10 47 63 Hz input voltage 0E9 100 Vac 10 47 63 Hz input voltage 1CM Rack mount kit Agilent part number 5063 9243 0L2 Extra English manual set local language manual files are included on the CD ROM Agilent part number 5964 8251 Accessories The accessories listed below may be ordered from your local Agilent Technologies Sales Office either with the power supply or separately Agilent No Description 10833A 10833B 34398A 34399A GPIB cable 1 m 8 3 ft GPIB cable 2 m 6 6 ft RS 282 9 pin f to 9 pin f 2 5 m 8 2 ft cable plus 9 pin m to 25 pin f adapter RS 282 adapter kit contains 4 adapters 9 pin m to 25 pin m for use with PC or printer 9 pin m to 25 pin f for use with PC or printer 9 pin m to 25 pin m for use with modem 9 pin m to 9 pin m for use with modem 15 Chapter 1 General Information Description Description The Agilent E3632A DC power supply feature a combination of programming capabilities and linear power supply performance that makes it ideal for power systems applications The power supply is programmable locally from the front panel or remotely over the GPIB and RS 232 interfaces This power supply has two ranges allowing
122. omputer software as defined in FAR 52 227 19 Jun 1987 or any equiva lent agency regulation or contract clause whichever is applicable You have only those rights provided for such Software and Docu mentation by the applicable FAR or DFARS clause or the Agilent standard software agreement for the product involved Safety Information Do not install substitute parts or perform any unauthorized modification to the product Return the product to an HP Sales and Service Office for service and repair to ensure that safety features are main tained Safety Symbols Warning Calls attention to a proce dure practice or condition that could possibly cause bodily injury or death Caution Calls attention to a proce dure practice or condition that could possibly cause damage to equipment or per manent loss of data Earth ground symbol JP Chassis ground symbol Refer to the manual for specific Warning or Caution information to avoid per sonal injury or equipment damage Hazardous voltages may be present Warning No operator serviceable parts inside Refer servicing to service trained personnel Warning For continued protection against fire replace the line fuse only with a fuse of the specified type and rating Manual Part Number E3632 90001 Printed October 2007 Edition 3 Printed in Malaysia DECLARATION OF CONFORMITY According to ISO IEC Guide 22 and CEN CENELEC EN 45014
123. on terminals by a pair of twisted or shielded wires Connect each load to the distribution terminals separately Table 7 1 Wire Rating AWG 10 12 14 16 18 20 22 24 26 28 Suggested 40 25 20 13 10 7 5 3 5 2 5 1 7 maximum Current amps mQ ft 1 00 1 59 2 53 4 02 6 39 10 2 16 1 25 7 40 8 64 9 m m 3 3 5 2 8 3 13 2 21 0 33 5 52 8 843 133 9 212 9 Single conductor in gree air at 30 C with insulation 147 Warning Chapter 7 Tutorial Connecting the Load To satisfy safety requirements load wires must be heavy enough not to overheat while carrying the short circuit output current of the power supply Remote Voltage Sensing Normally a power supply operating in the constant voltage mode achieves its optimum line and load regulations its lowest output impedance drift and ripple and noise and its fastest transient recovery performance at the power supply output terminals If the load is separated from the output terminals by any lead length some of these performance characteristics will be degraded at the load terminals usually by an amount proportional to the impedance of the load leads compared with the output impedance of the power supply With remote voltage sensing a feature included in the Agilent E3632A power supply it is possible to connect the input of the voltage feedback amplifier directly to the load terminals so that the regulator performs it
124. ou have learned how to install your power supply and perform initial operation During the initial operation you were briefly introduced to operating from the front panel as you learned how to check basic voltage and current functions This chapter will describe in detail the use of these front panel Keys and show how they are used to accomplish power supply operation e Front Panel Operation Overview page 35 e Constant Voltage Operation page 36 e Constant Current Operation page 38 e Storing and Recalling Operating States page 40 e Programming Overvoltage Protection page 42 e Programming Overcurrent Protection page 45 e Remote Voltage Sensing page 48 e Disabling the Output page 50 e Disabling the Output Using an External Relay page 51 e Knob Locking page 51 e System Related Operations page 52 e Remote Interface Configuration page 56 e GPIB Interface Configuration page 61 e RS 232 Interface Configuration page 62 e Calibration Overview page 66 Throughout this chapter the key to be pressed is shown in the left margin See Error Messages starting on page 121 in chapter 5 if you encounter any errors during front panel operation 34 Chapter 3 Front Panel Operation Front Panel Operation Overview Front Panel Operation Overview The following section describes an overview of the front panel keys before operating your power supply e The power supply is shipped from the factory configured in the
125. ower on condition SendSCPI Output ON Turn on the output For I 5 To 15 Convert the worksheet value to a string add to SCPI command SendSCPI Volt amp Str Cells I 1 Request a current measurement put response in worksheet Cells I 2 Val SendSCPI meas current Next I SendSCPI Output OFF Turn off the output ClosePort End Sub 136 Chapter 6 Application Programs Excel 5 0 Example for Windows 3 1 and GPIB GPIB bas Macro Option Explicit Declarations for VISA DLL additional declarations are usually in the directory c vxipnp win include in file visa bas also see the VISA manual Declare Function viOpenDefaultRM Lib VISA DLL Alias 141 sesn As Long As Long Declare Function viOpen Lib VISA DLL Alias 131 ByVal sesn As Long ByVal desc As String ByVal mode As Long ByVal TimeOut As Long vi As Long As Long Declare Function viClose Lib VISA DLL Alias 132 ByVal vi As Long As Long Declare Function viRead Lib VISA DLL Alias 256 ByVal vi As Long _ ByVal Buffer As String ByVal Count As Long retCount As Long As Long Declare Function viWrite Lib VISA DLL Alias 257 ByVal vi As Long ByVal Buffer As String ByVal Count As Long retCount As Long As Long Error Codes and other global variables Global Const VI_SUCCESS amp h0 amp Global videfaultRM As Long resource manager id for VISA GPIB Global vi As Long stores the session for VISA Dim errorStatus As Long VTL
126. owing by turning the knob to the right or left None 8 Bits Odd 7 Bits or Even 7 Bits When you set parity you are indirectly setting the number of the data bits 59 Chapter 3 Front Panel Operation Remote Interface Configuration I O Config 5 Save the change and turn off the I O configuration mode CHANGE SAVED The RS 232 baud rate and parity selections are stored in non volatile memory and does not change when power has been off or after aremote interface reset The power supply displays a message to show that the change is now in effect Ifthe baud rate and the parity are not changed NO CHANGE will be displayed for one second Note To exit the I O configuration mode without any further changes press the I O Config key until the NO CHANGE message is displayed 60 Chapter 3 Front Panel Operation GPIB Interface Configuration GPIB Interface Configuration The GPIB connector on the rear panel connects your power supply to the computer and other GPIB devices Chapter 1 lists the cables that are available from Agilent Technologies An GPIB system can be connected together in any configuration star linear or both as long as the following rules are observed e The total number of devices including the computer is no more than 15 e The total length of all the cables used is no more than 2 meter times the number of devices connected together up to a maximum of 20 meters Note IEEE
127. peration To change the security code first make sure that the power supply is unsecured Press Secure key after the CAL MODE message is displayed in the calibration mode enter the new security code using the knob and resolution selection keys then press Secure key Changing the code from the front panel also changes the code required from the remote interface Remote Interface Operation CAL SEC CODE lt new code gt Change the security code To change the security code first unsecure the power supply using the old security code Then enter the new code For example CAL SEC STAT OFF HP003632 Unsecure with old code CAL SEC CODE ZZ001443 Enter new code CAL SEC STAT ON ZZ00143 Secure with new code 69 Chapter 3 Front Panel Operation Calibration Overview Calibration Count You can determine the number of times that your power supply has been calibrated Your power supply was calibrated before it left the factory When you receive your power supply read the count to determine its initial value The calibration count feature can be performed from the remote interface only e The calibration count is storedin non volatile memory and does not change when power has been off or after a remote interface reset e The calibration count increments up to a maximum of 32 767 after which it wraps around to 0 Since the value increments by one for each calibration point a com
128. place the 2 5 AT fuse order Agilent part number 2110 0999 27 Output On Off Note Chapter 2 Initial Operation Power On Checkout Power On Checkout The power on test includes an automatic self test that checks the internal microprocessors and allows the user visually to check the display You will observe the following sequence on the display after pressing the front panel power switch to on All segments of the display including all annunciators will turn on for about one second To review the annunciators hold down Display Limit key as you turn on the power supply The GPIB address or RS 232 message will then be displayed for about one second ADDR 05 or RS 232 The GPIB address is set to 5 when the power supply is shipped from the factory for remote interface configuration If this is not the first time the power supply is turned on a different interface RS 232 or a different GPIB address may appear See Remote Interface Configuration in chapter 3 starting on page 56 if you need to change the remote interface configuration The 15V OVP OCP and OFF annunciators are on All others are off The power supply will go into the power on reset state the output is disabled the OFF annunciator turns on the 15V 7A range is selected the 15V annunciator turns on and the knob is selected for voltage control Notice that the OVP and OCP annunciator a
129. plete calibration will increase the value by 5 counts e Remote Interface Operation CAL COUN Query the number of times of calibration Calibration Message You can use the calibration message feature to record calibration information about your power supply For example you can store such information as the last calibration date the next calibration due date the power supply s serial number or even the name and phone number of the person to contact for a new calibration You can record and read information in the calibration message from the remote interface only e The power supply should be unsecured before sending a calibration message e The calibration message may contain up to 40 characters e The calibration message is stored in non volatile memory and does not change when power has been off or after a remote interface reset e Remote Interface Operation CAL STR lt quoted string gt Store the cal message The following command string shows how to store a calibration message CAL STR CAL 05 1 97 70 Chapter 3 Front Panel Operation Calibration Overview 71 Remote Interface Reference Remote Interface Reference e SCPI Command Summary page 73 gt Simplified Programming Overview page 78 e Using the APPLy Command page 81 e Output Setting and Operation Commands page 82 e Triggering Commands page 89 e System Related Commands page 92 e Calibration Commands page 96
130. put and the sense terminals AC Input Ratings selectable via rear panel selector std 115 Vac 10 47 to 63 Hz opt 0E3 230 Vac 10 47 to 63 Hz opt OE9 100 Vac 10 47 to 63 Hz Maximum Input Power 500 VA with full load Cooling Fan cooled Operating Temperature 0 to 40 C for full rated output At higher temperatures the output current is derated linearly to 50 at 55 C maximum temperature Output Voltage Overshoot During turn on or turn off of ac power output plus overshoot will not exceed 1 V if the output control is set to less than 1 V If the output control is set to 1 V or higher there is no overshoot Programming Language SCPI Standard Commands for Programmable Instruments State Storage Memory Three 3 user configurable stored states Recommended Calibration Interval 1 year 160 Chapter 8 Specifications Supplemental Characteristics Dimensions 213 MMW x 133 mmH x 348 mmD 8 4 x 5 2 x 13 7 in See below for detailed information Weight Net 9 5 kg 21 Ib Shipping 12 kg 26 Ib mune 132 6 mm PL 0000 cof Cl UUODOUOU0000 212 6 mm Col O c O00 147 6mm cocce c D0000 tL Ss Figure 8 1 Dimensions of Agilent E3632A Power Supply 161 Chapter 8 Sp
131. r supply is in the constant current mode If you operate the power supply in the constant current CC mode verify that the CC annunciator is lit If the CV annunciator is lit choose a higher voltage limit During actual CC operation if a load change causes the voltage limit to be exceeded the power supply will automatically crossover to constant voltage mode at the preset voltage limit and the output current will drop proportionately Remote interface operation VOLTage lt voltage gt MIN MAX Set the voltage CURRent lt current gt MIN MAX Set the current OUTPut ON Enable the output You can use the resolution selection keys to move the blinking digit to the right or left when setting the current 39 Store Chapter 3 Front Panel Operation Storing and Recalling Operating States Storing and Recalling Operating States You can store up to three different operating states in non volatile memory This also enables you to recall the entire instrument configuration with just a few key presses from the front panel The memory locations are supplied with the reset states from the factory for front panel operation Refer to the description of RST command starting on page 94 in chapter 4 for more information The following steps show you how to store and recall an operating state Front panel operation Set up the power supply for the desired operating state The storage feature remembers output range
132. rmal operating mode and will not recall the instrument state 3 from memory Recall 7 Restore the operating state The power supply should now be configured in the same state as when you stored the state on the previous steps DONE This message appears on the display for approximately 1 second e Remote interface operation SAV 1 2 3 Store an operating state to a specified location RCL 1 2 3 Recall a previously stored state from a specified location 41 Power Output On Off Over Voltage Note Over Voltage Chapter 3 Front Panel Operation Programming Overvoltage Protection Programming Overvoltage Protection Overvoltage protection guards the load against output voltages that reach a specified value greater than the programmed protection level It is accomplished by shorting the output via an internal SCR when the trip level is set to equal or greater than 3 volts or by progamming the output to 1 volt when the trip level is set to less than 3 volts The following steps show how to set the OVP trip level how to check OVP operation and how to clear overvoltage condition Front panel operation Setting the OVP Level and Enable the OVP Circuit Turn on the power supply The power supply will go into the power on reset state the output is disabled the OFF annunciator turns on the 15V 7A range is selected the 15V annunciator turns on and the knob is selected for volt
133. rrent gt MIN MAX Instead of selecting a specific current you can substitute MI Nimum or MAXimum in place of a parameter for many Nimum to set the current to its minimum value or MAXimum to set the current to its maximum value 113 Caution Chapter 4 Remote Interface Reference An Introduction to the SCPI Language Querying Parameter Settings You can query the value of most parameters by adding a question mark to the command For example the following command sets the output current to 5 amps CURR 5 You can query the value by executing CURR You can also query the minimum or maximum value allowed with the present function as follows CURR MAX CURR MIN Ifyou send two query commands without reading the response from the first and then attempt to read the second response you may receive some data from the first response followed by the complete second response To avoid this do not send a query command without reading the response When you cannot avoid this situation send a device clear before sending the second query command SCPI Command Terminators A command string sent to the power supply must terminate with a lt new line gt character The IEEE 488 EOI end or identify message is interpreted as a lt new line gt character and can be used to terminate a command string in place of a lt new line gt character A lt carriage return gt followed by a
134. ruments on the bus to identify which one requested service the instrument with bit 6 set in its Status Byte The request service bit is cleared only by reading the Status Byte using an IEEE 488 serial poll or by reading the event register whose summary bit is causing the service request To read the Status Byte summary register send the IEEE 488 serial poll message Querying the summary register will return a decimal value which corresponds to the binary weighted sum of the bits set in the register Serial poll will automatically clear the request service bit in the Status Byte summary register No other bits are affected Performing a serial poll will not affect instrument throughput 105 Chapter 4 Remote Interface Reference The SCPI Status Registers Caution The EEE 488 standard does not ensure synchronization between your bus controller program and the instrument Use the OPC command to guarantee that commands previously sent to the instrument have completed Executing a serial poll before a RST CLS or other commands have completed can cause previous conditions to be reported Using STB to Read the Status Byte The STB Status Byte query command is similar to a serial poll but it is processed like any other instrument command The STB command returns the same result as a serial poll but the request service bit bit 6 is notcleared The STB command is not handled automatically by the IE
135. s Then ReturnString Left ReturnString crlfpos 1 End If SendSCPI ReturnString return the remaining string End If end of query to instrument for a response Exit Function VierrorHandler Display the error message in the txtResponse TextBox MsgBox I O Error amp Error s Close the device session errorStatus viClose vi Exit Function End Function Sub OpenPort Dim VISAaddr As String DKK KKK KKK KK KK KKK KKK KKK KKKKEKEK Change the GPIB address here LKR KKK KKK KKK KKK KKK KKK KKKKKEKEK ViSAaddr 5 errorStatus viOpenDefaultRM videfaultRM open the visa session Open communication to instrument errorStatus viOpen videfaultRM GPIBO amp VISAaddr amp INSTR 0O If errorStatus lt VI_SUCCESS Then on error give message Cells 1 1 Unable to Open port End If End Sub Sub ClosePort errorStatus viClose vi close the session errorStatus viClose videfaultRM End Sub End of Program 1000 vi 138 Tutorial Tutorial The Agilent E3632A is a high performance instruments capable of delivering clean dc power But to take full advantage of the performance characteristics designed into the power supply certain basic precautions must be observed when connecting it for use on the lab bench or as a controlled power supply This chapter describes basic operation of linear power supplies and gives specific details on the operation and use of the Agile
136. s from output terminals to the load and connecting the sense leads from sense terminals to the load as shown below Observe polarity when connecting the sensing leads to the load Notice that the metal shorting bars should be removed from the output and sense terminals for remote voltage sensing connections For local voltage sensing connections the sense leads must be connected to the output terminals During remote sensing setup it is strongly recommended to power off by presssing power ON OFF button the power supply to avoid undesirable damage to the load or the power supply POWER SUPPLY Figure 3 2 Remote Voltage Sensing Connections 49 Chapter 3 Front Panel Operation Disabling the Output Disabling the Output The output of the power supply can be disabled or enabled from the front panel When the power supply is in the Off state the OFF annunciator turns on and the output is disabled The OFF annunciator turns off when the power supply returns to the On state When the output is disabled the voltage value is 0 volts and the current value is 0 02 amps The output state is stored in volatile memory the output is always disabled when power has been off or after a remote interface reset While the output is disabled the range selection keys the control knob resolution selection keys and adjust selection key are still working If the display is in the meter mode you cannot see
137. s function with respect to the load terminals rather than with respect to the power supply output terminals Thus the voltage at the power supply output terminals shifts by whatever amount is necessary to compensate for the voltage drop in the load leads thereby maintaining the voltage at the load terminals constant POWER SUPPLY SENSING LEAD O O f AAV Ea AEo 0 AEo x0 Bi SA S C SENSING LEAD Figure 7 7 Regulated Power Supply with Remote Sensing 148 Chapter 7 Tutorial Connecting the Load Load Consideration Capacitive Loading In most cases the power supply will be stable for almost any size load capacitance Large load capacitors may cause ringing in the power supply s transient response It is possible that certain combinations ofload capacitance equivalent series resistance and load lead inductance will result in instability If this occurs the problem may often be solved by either increasing or decreasing the total load capacitance A large load capacitor may cause the power supply to cross into CC or unregulated mode momentarily when the output voltage is reprogrammed The slew rate of the output voltage will be limited to the current setting divided by the total load capacitance internal and external Table 7 2 Slew Rate Internal Internal Bleed Slew Rate at No Load and Capacitance Resistor Full S
138. sponding output change Notice that the time delay is valid for only the bus trigger source e Finally you must provide an INITiate command If the IMMediate source is selected the selected output is set to the triggered level immediately But if the trigger source is the bus the power supply is set to the triggered level after receiving the Group Execute Trigger GET or TRG command Trigger Source Choices You must specify the source from which the power supply will accept a trigger The trigger is stored in volatile memory the source is set to bus when the power supply has been off or after a remote interface reset Bus Software Triggering e To select the bus trigger source send the following command TRIG SOUR BUS e To trigger the power supply from the remote interface GPIB or RS 232 after selecting the bus source send the TRG trigger command When the TRG is sent the trigger action starts after the specified time delay if any delay is given 89 Chapter 4 Remote Interface Reference Triggering Commands You can also trigger the power supply from the GPIB interface by sending the IEEE 488 Group Execute Trigger GET message The following statement shows how to send a GET from a Agilent Technologies controller TRIGGER 705 group execute trigger To ensure synchronization when the bus source is selected send the wAI wait command When the WAI command is executed the
139. ss format looks like this GPIBO 5 INSTR A Fy strcpy GPIB_address 5 Change GPIB address here strcpy Visa_address GPIBO strcat Visa_address GPIB_address 133 Chapter 6 Application Programs C Example for GPIB IEEE 488 continued Open communication session with power supply viOpenDefaultRM amp defaultRM viOpen defaultRM Visa_address 0 0 amp power_supply Query the power supply id read response and print a 7 sy viPrintf power_supply IDN n viScanf power_supply s amp reply_string printf Instrument identification string n s n n reply_string Initialize Power Supply viPrintf power_supply RST n Set power on condition viPrintf power_supply Current 2 n Set Current limit to 2A viPrintf power_supply Output on n Turn output on printf Voltage Current n n Print heading Step from 0 6v to 0 8 volt in 02volt steps for voltage 6 voltage lt lt 8001 voltage 02 viPrintf power_supply printf 3f voltage delay 500 viPrintf power_supply Measure Current n Volt f n voltage viScanf power_supply lf amp current printf 31f n current viPrintf power_supply Output Off n Close communication session viClose power_supply viClose defaultRM Pauses for a specified number of milliseconds void delay clock_t w
140. st The following steps show how to clear the overcurrent conditions and get back to normal mode operation In the following steps the display will go back to OCP TRIPPED if you let the display time out after about several seconds Readjust the OCP trip level or the output current level C D Lower the output current level below the OCP trip point after pressing the Display Limit or raise the OCP trip level by using the knob after pressing the Over Current key Move to the clear mode C ocp on You will see the above message after pressing the Over Current key If you changed the output current level press the Over Current key twice Turn the knob to the right until the OCP CLEAR appears on the display 46 Chapter 3 Front Panel Operation Programming Overcurrent Protection Over Current 3 Clear the overcurrent condition and exit this menu Now when you press Over Current key again the DONE message is displayed for a second and the OCP annunciator will not blink any more The output will return to meter mode e Remote interface operation CURR PROT lt current gt MIN MAX Set the OCP level CURR PROT STAT OFF ON Disable or enable the OCP circuit CURR PROT CLE Clear the tripped OCP circuit 47 Chapter 3 Front Panel Operation Remote Voltage Sensing Remote Voltage Sensing Remote voltage sensing is used to maintain regulation at the load and reduce the degr
141. supply SYSTem ERRor This query command reads one error from the error queue When the front panel ERROR annunciator turns on one ormore command syntax or hardware errors have been detected A record of up to 20 errors can be stored in the power supply s error queue See Error Messages for a complete listing of the errors in chapter 5 e Errors are retrieved in first in first out FIFO order The first error returned is the first error that was stored When you have read all errors from the queue the ERROR annunciator turns off The power supply beeps once each time an error is generated e Ifmore than 20 errors have occurred the last error stored in the queue the most recent error is replaced with 350 Too many errors No additional errors are stored until you remove errors from the queue If no errors have occurred when you read the error queue the power supply responds with 0 No error e The error queue is cleared when power has been off or after a CLS clear status command has been executed The RST reset command does not clear the error queue STATus QUEStionable CONDition This command queries the Questionable Status condition register to check CV or CC mode of the power supply The power supply returns a decimal value which corresponds to the binary weighted sum of all bits in the register These bits are not latched If 0 is returned the power supply is in output off or unregulated state I
142. t clear the error queue 93 Chapter 4 Remote Interface Reference System Related Commands SYSTem VERSion This command queries the power supply to determine the present SCPI version The returned value is of a string in the form YYYY V where the Y s represent the year of the version and the V represents a version number for that year for example 1995 0 IDN This query command reads the power supply s identification string The power supply returns four fields separated by commas The first field is the manufacturer s name the second field is the model number the third field is not used always 0 and the fourth field is a revision code which contains three numbers The first number is the firmware revision number for the main power supply processor the second is for the input output processor and the third is for the front panel processor The command returns a string with the following format be sure to dimension a string variable with at least 40 characters HEWLETT PACKARD E3632A 0 X X X X X X RST This command resets the power supply to its power on state as follows Command state CURR TA CURR STEP 0 12 mA typical value CURR TRIG TA CURR PROT 7 5 A CURR PROT STAT ON DISP ON OUTP OFF OUTP REL OFF TRIG DEL 0 TRIG SOUR BUS VOLT 0V VOLT STEP 0 55 mV typical value VOLT TRIG OV VOLT PROT 32 V
143. t current gt MINimum MAXimum UP DOWN The command syntax shows most commands and some parameters as a mixture of upper and lower case letters The upper case letters indicate the abbreviated spelling for the command For shorter program lines send the abbreviated form For better program readability send the long form For example in the above syntax statement CURR and CURRENT are both acceptable forms You can use upper or lower case letters Therefore CURRENT curr and Curr are all acceptable Other forms such as CUR and CURREN will generate an error Braces enclose the parameter choices for a given command string The braces are not sent with the command string A vertical bar separates multiple parameter choices for a given command string Triangle brackets lt gt indicate that you must specify a value for the enclosed parameter For example the above syntax statement shows the current parameter enclosed in triangle brackets The brackets are not sent with the command string You must specify a value for the parameter such as CURR 0 1 Some parameters are enclosed in square brackets The brackets indicate that the parameter is optional and can be omitted The brackets are not sent with the command string If you do not specify a value for an optional parameter the power supply chooses a default value Some portions of commands are enclosed in square brackets The brackets
144. ted string gt This command displays a message on the front panel The power supply will display up to 12 characters in a message any additional characters are truncated Commas periods and semicolons share a display space with the preceding character and are not considered individual characters DISPlay TEXT This command queries the message sent to the front panel and returns a quoted string DISPlay TEXT CLEar This command clears the message displayed on the front panel OUTPut OFF ON This command enables or disables the outputs of the power supply When the output is disabled the voltage value is 0 V and the current value is 20 mA At RST the output state is OFF OUTPut This command queries the output state of the power supply The returned value is 0 OFF or 1 ON 92 Note Note Chapter 4 Remote Interface Reference System Related Commands OUTPut RELay OFF ON This command sets the state of two TTL signals on the RS 232 connector These signals are intended for use with an external relay and relay driver The TTL output is available on the RS 232 connector pin and pin 9 When the OUTPut RELay state is ON the TTL output of pin 1 is high 4 5 V and pin 9 is low 0 5 V The levels are reversed when the OUTPut RELay state is OFF At RST the OUTPut RELay state is OFF TTL output of pin 1 or pin 9 of the RS 232 connector is available only after insta
145. tements executed from your computer will set the power supply to an output of 3 V rated at 1 A VOLT 3 0 Set output voltage to 3 0 V CURR 1 0 Set output current to 1 0A 78 Chapter 4 Remote Interface Reference Simplified Programming Overview Reading a Query Response Only the query commands commands that end with will instruct the power supply to send a response message Queries return either output values or internal instrument settings For example the following statements executed from your computer will read the power supply s error queue and print the most recent error dimension statement Dimension string array 80 elements SYST ERR Read error queue bus enter statement Enter error string into computer print statement Print error string Selecting a Trigger Source The power supply will accept a bus software trigger or an immediate internal trigger as a trigger source By default the BUS trigger source is selected If you want the power supply to use an immediate internal trigger you must select IMMediate For example the following statements executed from your computer will set to an output of 3 V 1 A immediately VOLT TRIG 3 0 Set the triggered voltage level to 3 0 V CURR TRIG 1 0 Set the triggered current level to 1 0A TRIG SOUR IMM Select the immediate trigger as a source INIT Cause the trigger system to
146. terface reset or after returning to local from remote You can display a message on the front panel by sending a command from the remote interface The power supply can display up to 12 characters of the message on the front panel any additional characters are truncated Commas periods and semicolons share a display space with the preceding character and are not considered individual characters When a message is displayed outputs are not sent to the display Sending a message to the display from the remote interface overrides the display state this means that you can display a message even if the display is turned off The display state is automatically turned on when you return to the local front panel operation Press Local key to return to the local state from the remote interface Remote interface operation DISP OFF ON Disable enable the display DISP TEXT lt quoted string gt Display the string enclosed in quotes DISP TEXT CLE Clear the displayed message The following statement shows how to display a message on the front panel from a Agilent Technologies controller DISP TEXT HELLO 54 Chapter 3 Front Panel Operation System Related Operations Firmware Revision Query The power supply has three microprocessors for control of various internal systems You can query the power supply to determine which revision of firmware is installed for each micropr
147. the changes of output voltage and current settings on the display when turning the knob To see or check the changes when the outputs are disabled the display should be in the limit mode Front panel operation You can disable the output by pressing Output On Off key This key toggles between output Off and On states Remote interface operation OUTP OFF ON Disable or enable the output 50 Note Note Chapter 3 Front Panel Operation Disabling the Output Using an External Relay Disabling the Output Using an External Relay When the output of the E3632A is turned off it is implemented by setting the output to 0 volts and 0 02 amps This gives a zero output voltage without actually disconnecting the output To disconnect the output an external relay must be connected between the output and the load A TTL signal of either low true or high true is provided to control an external relay This signal can only be controlled with the remote command OUTPut RELay OFF ON The TTL output is available on the RS 232 connection pin and pin 0 When the OUTPut RELay state is ON the TTL output of pin 1 is high 4 5 V and pin 9 is low 0 5 V The levels are reversed when the OUTPut RELay state is OFF TTL output of pin 1 or pin 9 of the RS 232 connector is available only after installing two jumpers inside the power supply See the Service Guide for more information
148. the voltages of the individual power supplies The current is the current of any one power supply Each of the individual power supplies must be adjusted in order to obtain the total output voltage Parallel Connections Two or more power supplies being capable of CV CC automatic cross over operation can be connected in parallel to obtain a total output current greater than that available from one power supply The total output current is the sum of the output currents of the individual power supplies The output of each power supply can be set separately The output voltage controls of one power supply should be set to the desired output voltage the other power supply should be set for a slightly higher output voltage The supply with the higher output voltage setting will deliver its constant current output and drop its output voltage until it equals the output of the other supply and the other supply will remain in constant voltage operation and only deliver that fraction of its rated output current which is necessary to fulfill the total load demand 151 Chapter 7 Tutorial Remote Programming Remote Programming During remote programming a constant voltage regulated power supply is called upon to change its output voltage rapidly The most important factor limiting the speed of output voltage change is the output capacitor and load resistor ASYMPTOTIC LEVEL I R E NEW Eur TC R Co E INIT
149. tion to the mandatory statutory rights applicable to the sale of this product Exclusive Remedies To the extent allowed by local law the remedies pro vided herein are the Buyer s sole and exclusive remedies Agilent shall not be liable for any direct indirect special incidental or consequential damages including lost profit or data whether based on warranty contract tort or any other legal the ory Notice The information contained in this document is subject to change without notice To the extent allowed by local law Agilent makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchantability and fitness for a particular purpose To the extent allowed by local law Agilent shall not be liable for errors con tained herein or for inciden tal or consequential damages in connection with the furnishing performance or use of this material No part of this document may be photocopied repro duced or translated to another language without the prior written consent of Agilent Restricted Rights The Software and Documen tation have been developed entirely at private expense They are delivered and licensed as commercial computer software as defined in DFARS 252 227 7013 Oct 1988 DFARS 252 211 7015 May 1991 or DFARS 252 227 7014 Jun 1995 as a commercial item as defined in FAR 2 101 a or as restricted c
150. tion of the power supply and therefore reduce the internal heat of the power supply Maximum internal power dissipation occurs at maximum current The internal power dissipation further increases as the output voltage is lowered A fan internal to the Agilent E3632A is essential to keep internal temperatures low To assist in cooling the Agilent E3632A the sides and rear of the Agilent E3632A should be kept clear 154 Specifications Specifications The performance specifications are listed in the following pages Specifications are warranted in the temperature range of 0 to 40 C with a resistive load Supplemental characteristics which are not warranted but are descriptions of performance determined either by design or testing The service guide contains procedures for verifying the performance specifications 156 Chapter 8 Specifications Performance Specifications Performance Specifications Output Ratings 0 C 40 C Low range O to 15 V 0to7A High range O to 30 V O to 4 A Programming Accuracy 12 months 25 C 5 C of output offset Voltage 0 05 10 mV Current 0 2 10 mA Readback Accuracy 12 months over GPIB and RS 232 or front panel with respect to actual output 25 C 5 C of output offset Voltage 0 05 5 mV Current 0 15 5 mA Ripple and Noise with outputs ungrounded or with either output terminal grounded 20 Hz to 20 MHz Normal mode voltage lt 0 35 mV rms
151. transferred to the output terminals when a trigger occurs A pending triggered level is not affected by subsequent CURRent commands CURRent TRIiGgered MINimum MAXimum This query returns the triggered current level presently programmed If no triggered level is programmed the CURRent level is returned CURR TRIG MAX and CURR TRIG MIN return the highest and lowest programmable triggered current levels 83 Chapter 4 Remote Interface Reference Output Setting and Operation Commands CURRent PROTection lt current gt MINimum MAXimum This command sets the current level at which the overcurrent protection OCP circuit will trip If the peak output current exceeds the OCP level then the output current is programmed to zero The Questionable Status register OC bit is set see page 101 An overcurrent condition can be cleared with the CURR PROT CLE command after the condition that caused the OCP trip is removed CURRent PROTection MINimum MAXimum This query returns the overcurrent protection trip level presently programmed CURR PROT MAX and CURR PROT MINreturn the maximum and minimum programmable overcurrent trip levels CURRent PROTection STATe 0 1 OFF ON This command enables or disables the overcurrent protection function of the power supply An overcurrent condition can be cleared with the CURR PROT CLE command after the condition that caused the OCP trip is removed At RST this valu
152. ts the power supply to a calibration point that is entered with CAL CURR command During calibration three points must be entered and the low end point MIN must be selected and entered first CALibration CURRent PROTection This command calibrates the overcurrent protection circuit of the power supply It takes about 7 seconds to execute the command The calibration must be unsecured and the output shorted before calibrating the overcurrent protection The power supply automatically performs the calibration and stores the new overcurrent constant in nonvolatile memory Notice that current calibration precedes before sending this command 96 Chapter 4 Remote Interface Reference Calibration Commands CALibration DAC ERRor This command corrects the differential nonlinearity error of the internal DAC without an external meter You must send this command before calibrating the voltage It takes about 30 seconds to execute the command CALibration SECure CODE lt new code gt This command enters a new security code To change the security code first unsecure the power supply using the old security code Then enter the new code The calibration code may contain up to 12 characters over the remote interface but the first character must always be a letter CALibration SECure STATe OFF ON lt code gt This command unsecures or secures the power supply for calibration The calibration code may contain up to 12 characters over the remote
153. uffer ESB 32 One or more bits are set in the standard event register bits must be enabled in the enable register RQS 64 The power supply is requesting service serial poll Not Used 0 Always set to 0 104 Chapter 4 Remote Interface Reference The SCPI Status Registers The Status Byte Summary register is cleared when e You execute the CLS clear status command e Querying the Standard Event register ESR command will clear only bit 5 in the Status Byte summary register For example 24 8 16 is returned when you have queried the status of the Status Byte register QUES and MAV conditions have occurred The Status Byte Enable register Request Service is cleared when e You execute the SRE 0 command e You turn on the power and have previously configured the power supply using the PSC 1 command e The enable register will not be cleared at power on if you have previously configured the power supply using PSC 0 Using Service Request SRQ and Serial POLL You must configure your bus controller to respond to the IEEE 488 service request SRQ interrupt to use this capability Use the Status Byte enable register SRE command to select which summary bits will set the low level IEEE 488 service request signal When bit 6 request service is set in the Status Byte an IEEE 488 service request interrupt message is automatically sent to the bus controller The bus controller may then poll the inst
154. urning the knob Notice that the display is in the meter mode Meter mode means that the display shows the actual output voltage and current Adjust the voltage limit value to 1 0 volt C Set the display to the limit mode the Limit annunciator will be blinking Adjust the voltage limit to 1 0 volt to assure CC operation The CC annunciator will turn on Check that the front panel ammeter properly responds to knob control for the 15V 7A range C Set the knob to the current control and turn the knob clockwise or counter clockwise when the display is in the meter mode the Limit annunciator is off Check that the ammeter responds to knob control and the voltmeter indicates nearly zero the voltmeter will show the voltage drop caused by the test lead 30 Chapter 2 Initial Operation Output Checkout 6 Ensure that the current can be adjusted from zero to the full rated value Adjust the knob until the ammeter indicates 0 amps and then until the ammeter indicates 7 0 amps a Note If an error has been detected during the output checkout procedures the ERROR annunciaior will turn on See Error Messages for more information starting on page 121 in chapter 5 1You can use the resolution selection keys to move the blinking digit the right or left when setting the current 31 Chapter 2 Initial Operation Output Checkout 32 Front Panel Operation Note Front Panel Operation So far y
155. utput Select from 0 to 8600 seconds MIN 0 seconds MAX 3600 seconds At RST this value is set to 0 seconds TRIGger DELay This command queries the trigger delay TRIGger SOURce BUS IMMediate This command selects the source from which the power supply will accept a trigger The power supply will accept a bus software trigger or an internal immediate trigger At RST the bus trigger source is selected TRIGger SOURce This command queries the present trigger source Returns BUS or IMM TRG This command generates a trigger to the trigger subsystem that has selected a bus software trigger as its source TRIG SOUR BUS The command has the same effect as the Group Execute Trigger GET command For RS 232 operation make sure the power supply is in the remote interface mode by sending the SYST REM command first 91 Chapter 4 Remote Interface Reference System Related Commands System Related Commands DISPlay OFF ON This command turns the front panel display off or on When the display is turned off outputs are not sent to the display and all annunciators are disabled except the ERROR annunciator The display state is automatically turned on when you return to the local mode Press the Local key to return to the local state from the remote interface DISPlay This command queries the front panel display setting Returns 0 OFF or ey ON DISPlay TEXT lt quo
156. voltage spikes 146 Chapter 7 Tutorial Connecting the Load Connecting the Load Output Isolation The output of the power supply is isolated from chassis ground Any output terminal may be grounded or an external voltage source may be connected between any terminal output and ground However output terminals must be kept within 60 Vdc when metal shorting bars without insulation are used to connect the output to the sense and the output and the sense terminals or 240 Vdc of ground when metal shorting bars without insulation are either replaced with insulated conductors or they are removed from the terminals so there is no operator access to the output conductors without insulation A chassis ground terminal is provided on the front panel for convenience Multiple Loads When connecting multiple loads to the power supply each load should be connected to the output terminals using separate connecting wires This minimizes mutual coupling effects between loads and takes full advantage of the low output impedance of the power supply Each pair of wires should be as short as possible and twisted or shielded to reduce lead inductance and noise pick up If a shield is used connect one end to the power supply ground terminal and leave the other end disconnected If cabling considerations require the use of distribution terminals that are located remotely from the power supply connect output terminals to the distributi
157. voltage will increase or decrease 10 mV if the step size is 0 01 This command is useful when you program the power supply to the allowed minimum resolution At RST the step size is the value of the minimum resolution VOLTage STEP DEFault This query returns the value of the step size currently specified The returned parameter is a numeric value DEFault gives the minimum resolution step size in unit of volts VOLTage TRIiGgered lt voltage gt MINimum MAXimum This command programs the pending triggered voltage level The pending triggered voltage level is a stored value that is transferred to the output terminals when a trigger occurs A pending triggered level is not affected by subsequent VOLTage commands VOLTage TRIGgered MINimum MAXimum This query returns the triggered voltage level presently programmed If no triggered level is programmed the VOLT level is returned VOLT TRIG MAX and VOLT TRIG MINreturn the highest and lowest programmable triggered voltage levels VOLTage PROTection lt voltage gt MINimum MAXimum This command sets the voltage level at which the overvoltage protection OVP circuit will trip If the peak output voltage exceeds the OVP level then the power supply output is skorted by an internal SCR The Questionable Status register OV bit is set see page 101 An overvoltage condition can be cleared with the VOLT PROT CLE command after the condition that c
158. when power has been off or after a remote interface reset e To secure the power supply from the remote interface the security code may contain up to 12 alphanumeric characters as shown below The first character must be a letter but the remaining characters can be letters or numbers You do not have to use all 12 characters but the first character must always be a letter A 12 characters e To secure the power supply from the remote interface so that it can be unsecured from the front panel use the eight character format shown below The first two characters must be H P and the remaining characters must be numbers Only the last six characters are recognized from the front panel but all eight characters are required To unsecure the power supply from the front panel omit the H P and enter the remaining numbers as shown on the following pages HP 8 characters If you forget your security code you can disable the security feature by adding a jumper inside the power supply and then entering a new code See the Service Guide for more information 66 Chapter 3 Front Panel Operation Calibration Overview To Unsecure for Calibration You can unsecure the power supply for calibration either from the front panel or over the remote interface The power supply is secured when shipped from the factory and the security code ts set to HP003632 Front Panel Operation SECURED If the power supply is s

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