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Model 2303/2303B/2303-PJ

1. eene eene FORMat BORDer lt name gt eese eene nennen PSY S Tem subSyStetm birins nio ti ete eene eye oriri Roa SYSTem POSetup lt name gt eese 11 SCPI Tables SCPI command subsystems reference tables s 11 2 A Specifications B Error and Status Messages C Emulation Commands HP 6632A power supply emulation commands C 2 Fluke PM2811 power supply emulation commands C 5 D Emulation Commands Selecting the 488 1 protocol esee D 2 Protocol diff rences Eri ve rero a HW edente caaveacecsse D 3 List of Illustrations 1 Getting Started High speed power supply Simplified power supply diagram sese 1 5 2 Basic Power Supply Operation Typical connections Output capabilities ure entere ne tcc teta reg Sink operation example 3 Pulse Current Measurements Pulse current measurement eese eene eene 3 2 5 Relay Control Relay Control i2 icr eren rte t neret rU Perte drei svat 5 3 Miniature phono plug 6 GPIB Operation TEEE 488 connector ccc0sccesccscsccocsecoseccessscssseveccveesvevsensueccestecuascess 6 2 7 Status Structure Status model structure ccccccsessccesssccessneecssneeessseeeeseeeessseeessteeeseed l6 bit status register i2 rentre i pee E ten ge eh Status byte and service request ssessseeeeereeenr
2. CONDition B15 B10 Measurement p RAV PTT ROF B8 B6 B5 B4 B3 B2 BO mE RAV PTT ROF B8 B6 B5 B4 B3 B2 BO Condition Register EVENt 2 Measurement B15 B10 Event Register To MSB bit of Status Byte Register ENABle lt NRf gt ENABle Measurement Event B15 B10 B2 BO RAV PTT ROF B8 B6 B5 B4 B3 Enable Register 512 32 16 8 Decimal Weights 29 2 24 23 BF Buffer Full amp Logical AND RAV Reading Available OR Logical OR PTT Pulse Trigger Timeout ROF Reading Overflow 7 14 Status Structure Questionable event status The used bit of the questionable event register shown in Figure 7 7 is described as follows Bit B8 calibration summary Cal Set bit indicates that an invalid calibration con stant was detected during the power up sequence This error will clear after successful calibration of the power supply Figure 7 7 Questionable event status Cal CONDition B15 B9 B8 B7 BO EVENt m B15 B9 To QSB bit of Status Byte for amp Register ENABLe lt NRf gt Cal Fa ENABLe B15 B9 B8 B7 B0 Decimal us 256 E Weights 28 Cal Calibration Summary Questionable Condition Register Questionable Event Register Qusetionable Event Enable Register amp Logical AND OR Logical OR S
3. Measurement configuration NOTE Current range is selected from the CURRENT RANGE item of the menu Integration times average readings count trigger delay and trigger level are set from the PULSE CURRENT item of the menu Details on integration rate average readings count trigger delay and trigger level are provided in the Overview Table 1 2 in Section 1 shows the menu structure Rules to navigate the menu follow the table Current range For pulse current measurements the AUTO range selection is functionally a no op no oper ation The instrument will not autorange with the pulse current measurement function selected For Models 2303 and 2303B pulse current measurements are performed on the 5A range regardless of the range selection For Model 2303 PJ pulse current measurements are performed on which ever range the instrument is on when the pulse current measurement function is selected Current range is linked to current limit Therefore as a general rule the user selects the cur rent range before setting the current limit See Outputting voltage and current in Section 2 for details on current range and current limit Current range is selected from CURRENT RANGE item of the menu Integration times Use the following items of the PULSE CURRENT menu item to set integration times HIGH TIME Use to set the integration period in usec for high pulse current mea surements LOW TIME Use to set the int
4. SYSTem subsystem DISPlay FORMat and SYSTem 10 7 The SYSTem subsystem contains miscellaneous commands that are summarized in Table 10 3 Table 10 3 SCPI commands system Command SYSTem LFRequency POSetup lt name gt VERSion ERRor CLEar Description Default Ref Read power line frequency Sec 1 Select power on setup RST or SAVx where A x O to 4 Model 2303 PJ x 0 to 9 Model 2303 2303B Query SCPI revision level Read and clear oldest message in error queue see Sec 7 Clear messages from error queue Note Sec 7 See Line power connection under Power up for details Note Clearing the error queue Power up and CLS clears the error queue RST and STATus PRESet have no effect on the error queue SYSTem POSetup name Program power on defaults Parameters name RST SAVO SAVI SAV2 SAV3 SAVA SAV5 SAV6 SAV7 SAV8 SAV9 Power up to RST defaults Power up to setup stored in memory location 0 Power up to setup stored in memory location 1 Power up to setup stored in memory location 2 Power up to setup stored in memory location 3 Power up to setup stored in memory location 4 Power up to SAVO output on or off Power up to SAV1 output on or off Power up to SAV2 output on or off Power up to SAV3 output on or off Power up to SAV4 output on or off NOTE SAV5 SAV9 are not available for the Model 2303 PJ 10 8 DISPlay FORMat and SYS
5. AVERage Query average integration time SYNChronize Path for pulse detection triggering STATe lt b gt Send ON to select pulse current measurements or ON OFF to select pulse current digitization STATe Query pulse current synchronization selection DELay lt NRf gt Specify trigger delay in seconds 0 to 0 1 or 0 to 5 0 pulse current digitization DELay Query trigger delay TLEVel lt NRf gt Models 2303 and 2303B Set trigger level 0 to 5 amps 0 SCPI Tables 11 5 Table 11 4 cont SENSe command summary Default Command Description parameter SCPI TLEVel Model 2303 and 2303B query trigger level TLEVel Model 2303 PJ AMP lt NRf gt Set trigger level for 5A range 0 to 5 amps 0 AMP Query trigger level for 5A range MILLiamp lt NRf gt Set trigger level for 5 00mA range 0 to 0 5 amps MILLiamp Query trigger level for 500mA range 0 LINTegration Path to configure long integration measurements 1 TIME lt NRf gt Set integration time in seconds X to 60 where X is 0 850 for 60Hz or 0 840 for 50Hz TIME Query integration time AUTO Power supply sets integration time TLEVel lt NRf gt Models 2303 and 2303B Set trigger level 0 to 5A 0 TLEVel Models 2303 and 2303B Query trigger level TLEVel Model 2303 PJ AMP lt NRf gt Set trigger level for 5A range 0 to 5 amps 0 AMP Query trigger level for 5A range MILLiamp lt NRf gt Set trig
6. Integration time Use the following items of the LONG INTEGRATION menu item to set the integration time Integration time Manually set the long integration time For 60Hz power line frequency integration time can be set from 850msec to 60 sec For 50Hz power line frequency integration time can be set from 840msec to 60 sec Auto time Use to automatically set the integration time When the AUTO TIME operation is performed the instrument measures the time between two rising pulse edges and sets an appropriate inte gration time that will encompass the high and low periods of a single pulse Pulse timeout Use the following item of the LONG INTEGRATION menu item to set pulse timeout Pulse timeout Set pulse timeout from 1 to 63 seconds for long integration measurements that are config ured to be triggered by rising or falling pulse edges If a pulse is not detected within the specified time pulse timeout the NO PULSE message will be displayed While the NO PULSE message is displayed the instrument continues to search for a pulse Trigger edge and trigger level Use the following items of the LONG INTEGRATION menu item to set trigger edge and trigger level Trigger edge A pulse edge can be used to trigger the start of the measurement Select RISING to use a ris ing pulse edge to start the measurement Select FALLING to use a falling pulse edge to start the measurement A third option is available if you do not want measur
7. Service Request Enable Register Status Structure 7 7 Status byte register The summary messages from the status registers and queues are used to set or clear the appro priate bits BO B2 B3 B4 B5 and B7 of the status byte register These summary bits do not latch and their states 0 or 1 are solely dependent on the summary messages 0 or 1 For exam ple if the standard event register is read its register will clear As a result its summary message will reset to O which in turn will reset the ESB bit in the status byte register The bits of the status byte register are described as follows Bit B0 measurement status MSB Set summary bit indicates that an enabled mea surement event has occurred Bit B1 Not used Bit B2 error available EAV Set summary bit indicates that an error or status mes sage is present in the error queue Bit B3 questionable summary bit QSB Set summary bit indicates that an enabled questionable event has occurred Bit B4 message available MAV Set summary bit indicates that a response message is present in the output queue Bit B5 event summary bit ESB Set summary bit indicates that an enabled stan dard event has occurred Bit B6 request service rqs master summary status MSS Set bit indicates that an enabled summary bit of the status byte register is set Bit B7 operation summary OSB Set summary bit indicates that an enabled
8. use an unmodified patch cord to connect the relay circuit to the power supply The part number for the phono jack is listed in the table for Switchcraft connection accessories Figure 5 2 Miniature phono plug Relay Chassis Ground i 7 5VDC Table 5 1 Switchcraft connection accessories Part number Description TT253 Miniature Phono Plug 3 conductor UJ2B Miniature Phono Jack 3 conductor Patch Cords 3 conductor TT741 0 5 ft patch cord TT742 1 ft patch cord TT744 2 ft patch cord TT746 3 ft patch cord TT747 4 ft patch cord TT748 5 ft patch cord TT749 6 ft patch cord Switchcraft Inc 5555 N Elston Ave Chicago IL 60630 Phone 312 631 1234 FAX 312 792 2129 Relay Control 5 5 Controlling the relay The external relay is controlled from the OUTPUT RELAY item of the menu The menu is accessed by pressing the MENU key NOTE Table 1 2 in Section 1 shows the menu structure Rules to navigate the menu follow the table 1 From the menu select OUTPUT RELAY 2 Select the desired relay control option ONE or ZERO Selecting ONE closes the relay control circuit to energize the relay while ZERO opens the circuit to de energize the relay SCPI programming Table 5 2 SCPI command output relay control Command Description Default OUTPut OUTPut subsystem RELay name Close ONE or open ZERO relay control circuit ZERO 5 6 Relay Control GPIB O
9. C 6 Emulation Commands NSTrument STATe lt b gt Parameters b 1 or ON Turn output on 0 or OFF Turn output off Query INSTrument STATe Query state of the power supply output Description This command is used to turn the power supply output on or off Note that DVM measurements can be performed with the output off D Models 2303 and 2303B GPIB 488 1 Protocol D 2 Models 2303 and 2303B GPIB 488 1 Protocol Introduction The Models 2303 and 2303B Power Supply support two GPIB protocols SCPI and 488 1 The 488 1 protocol is included to significantly increase speed over the GPIB When using the 488 1 protocol throughput is enhanced for data sent to the power supply command messages and for data returned by the power supply response messages The speed of readings sent over the GPIB is also increased Factory default is SCPI protocol NOTE With the 488 1 protocol selected you will still use SCPI commands to program the power supply Operation differences between the two protocols are discussed in this Appendix Selecting the 488 1 protocol Perform the following steps to select the 488 1 protocol 1l Press MENU to display the MAIN MENU Use the A or v keys to select GPIB MENU and then press ENTER to display it 3 Use the A or v keys to display PROTOCOL and press ENTER to display the present PROTOCOL setting Use the A or v keys to display 488 1 and press ENTER to select for 488 1 protocol 5 Use the M
10. Current limit modes in Section 2 Relay Control 5 3 Figure 5 1 Relay control External Source Power Supply Relay Relay Control Relay Protection Diode Chassis PI Ground ve ecrit A l A External Source 0 Power Supply Relay Control T Internal Source 5VDC i I I Protection Diode 5 Chassis Ground EEE EA B Internal Source 5 4 Relay Control Connections An external relay circuit is connected to the power supply via the miniature phono jack on the rear panel labeled relay control 15VDC MAX The required phono plug that mates to the phono jack is shown in Figure 5 2 The illustration provides terminal identification for the conductors of the plug This phone plug is available from Switchcraft Inc see table for Switchcraft connection accessories Also available from Switchcraft is a three conductor patch cord that is terminated with a phono plug on each end The patch cord is available in various lengths from 0 5 ft to 6 ft The part numbers for the patch cords are listed in the table for Switchcraft connection accessories You can remove cut one of the phono plugs from the patch cord One end of the modified patch cord plugs into the phono jack on the power supply and the unterminated end is hard wired to the external relay circuit s Another alternative is to wire the external relay circuit to a second phono jack You can then
11. 420 Query deadlocked EE 410 Query unterminated EE 363 Query interrupted SYS 350 Input buffer overrun SYS 330 Queue overflow EE 314 Self test failed EE 315 Save recall memory lost EE 260 Configuration memory lost EE 241 Expression error EE 230 Hardware missing EE 225 Data corrupt or stale EE 224 Out of memory EE 223 Illegal parameter value EE 222 Too much data EE 221 Parameter data out of range EE 220 Settings conflict EE 200 Parameter error EE 178 Execution error EE 171 Expression data not allowed EE 170 Invalid expression EE 161 Expression error EE 160 Invalid block data EE 158 Block data error EE 154 String data not allowed EE 151 String too long EE 150 Invalid string data EE String data error EE error event SE status event SYS system error event Error and Status Messages Number Description Event 148 Character data not allowed EE 144 Character data too long EE 141 Invalid character data EE 140 Character data error EE 124 Too many digits EE 123 Exponent too large EE 121 Invalid character in number EE 120 Numeric data error EE 114 Header suffix out of range EE 113 Undefined header EE 112 Program mnemonic too long EE 111 Header separator error EE 110 Command header error EE 109 Missing parameter EE 108 Parameter not allowed EE 105 GET not allowed EE 104 Data type error EE 103 Invalid separator EE 102 Syntax error EE 101 Invalid character EE 100 Comma
12. SAFETY Conforms with European Union Directive 73 23 EEC EN 61010 1 AC LINE LEAKAGE CURRENT 450p A 110VAC typ 600A 220VAC typ RELAY CONTROL JACK 1 channel sink 150mA max 15V max 5V output 100mA max also available on jack Accepts 0 173 in Bantam type plug CS 1003 1 ACCESSORIES SUPPLIED User manual service manual output connector mating terminal part no CS 846 ACCESSORIES AVAILABLE Model 2304 DISP Remote Display Keypad 4 6 in x 2 7 in x 1 5 in Includes 2 7m 9 ft cable and rack mount kit Optional Version Model 2303B 2303 with blank front panel only AC power indicator LED 1 PLC 1 00 Following 15 minute warm up the change in output over 8 hours under ambient temperature constant load and line operating conditions 3 Remote sense at output terminals 100096 load change typical Remote sense with 4 5m 15 ft of 16 gauge wire and 1Q resistance in each source lead to simulate typical test environment up to 1 5A load change 5 Minimum current in constant current mode is 6mA 60Hz 50Hz 7 PLC Power Line Cycle 1PLC 16 7ms for 60Hz operation 20ms for 50Hz operation 8 Display off Speed includes measurement and binary data transfer out of GPIB Specifications subject to change without notice A 4 Specifications Error and Status Messages B 2 Error and Status Messages Number Description Event 440 Query unterminated after indefinite EE 430 response EE
13. following codes KEITHLEY INSTRUMENTS INC MODEL 2303 xxxxxxx yyyyy zzzzz KEITHLEY INSTRUMENTS INC MODEL 2303B xxxxxxx yyyyy zzzzz KEITHLEY INSTRUMENTS INC MODEL 2303 PJ xxxxxxx yyyyy Zzzzz Where xxxxxxx is the serial number yyyyy zzzzz is the firmware revision levels of the digital board and display board ROMs Power supplies set for the decimal output format and Keithley output type have the following codes KI 2303 0 yyyyy zzzzz KI 2303B 0 yyyyy zzzzz KI 2303 PJ 0 yyyyy zzzzz For the Fluke output type regardless of the output format the code is FLUKE PM2832 11 0 V1 0 OPC operation complete Sets OPC bit OPC operation complete query Places a 1 in output queue When OPC is sent the OPC bit in the standard event register will set after all pending com mand operations are complete When OPC is sent an ASCII 1 is placed in the output queue after all pending command operations are complete Typically either one of these command is sent after a reading or reading array is requested While the instrument is acquiring readings all commands except DCL SDC IFC TRG and GET that are sent are not executed After all readings are acquired the instrument returns to the idle at which time all pending commands including OPC and or OPC are executed Syntax The following syntax rules explain how to use OPC and OPC with other com mands refer to Table 8 2 for examples Send O
14. is sent with the SRE command i e SRE 0 The commands to program and read the SRQ enable register are listed in Table 7 2 Serial polling and SRQ Any enabled event summary bit that goes from 0 to 1 will set bit B6 and generate an SRQ service request In your test program you can periodically read the status byte to check if an SRQ has occurred and what caused it If an SRQ occurs the program can for example branch to an appropriate subroutine that will service the request Typically SRQs are managed by the serial poll sequence of the power supply If an SRQ does not occur bit B6 RQS of the status byte register will remain cleared and the program will sim ply proceed normally after the serial poll is performed If an SRQ does occur bit B6 of the status byte register will set and the program can branch to a service subroutine when the SRQ is detected by the serial poll The serial poll automatically resets RQS of the status byte register This allows subsequent serial polls to monitor bit B6 for an SRQ occurrence generated by other event types After a serial poll the same event can cause another SRQ even if the event register that caused the first SRQ has not been cleared The serial poll does not clear MSS The MSS bit stays set until all status byte summary bits are reset SPE SPD serial polling The SPE SPD general bus command is used to serial poll the power supply Serial polling obtains the serial poll byte status
15. model number serial A number and firmware revision levels of the unit OPC Operation complete Set the operation complete bit in the standard event B command register after all pending commands have been executed OPC Operation complete query Places an ASCII 1 into the output queue when all B pending selected device operations have been completed RCL lt NRf gt Recall command Returns the power supply to the user saved setup C RST Reset command Returns the power supply to the RST default D conditions SAV lt NRf gt Save command Saves the present setup as the user saved setup C SRE lt NRf gt Service request enable Programs the service request enable register Sec 7 command SRE Service request enable query Reads the service request enable register Sec 7 STB Status byte query Reads the status byte register Sec 7 TRG Trigger command Sends a bus trigger to the power supply E TST Self test query Performs a checksum test on ROM and returns the F result WAI Wait to continue command Wait until all previous commands are executed G Common Commands 8 3 IDN identification query Reads identification code The identification code includes the manufacturer model number serial number and firm ware revision levels Identification codes vary with the model number output formats and output types Power supplies set for the exponential output format and Keithley output types have the
16. nine reti rer i De genit Pulse titeout cnr iie oct Red Measurement configuration eeseeseeeeeeeeeren eene ne Current LANGE M Integration tme i m rra erre te er te ricos Reed Pulse timeout cese e teet oer Re Ree a pen Trigger edge and trigger level see Long integration display mode esee Long integration measurement procedure sese General NOTES ovseint erii er tertie Ee te decides e tnt agg Determining correct trigger level long integration SCPI programming edicere specie kanien iieii EERE Programming example sese eem 5 Relay Control OVeOTVIeW etude sitem ui en ee ERE eee iv EUN n Rete ETE S ICDPIEHEREEI PE Controlling the relay esee nennen Ne udlvoriiiire E p esd 6 GPIB Operation JtrodUction Lm GPIB bus connections eret tne tte tete tenta np ei tate tn eae ided Primary address PM Output FOMA crore tr i te os OR ORE te aired General bus commands eee nee eene REN remote enable essen eene IFC nterface clear Robert ie ei reap de ELO local lockolt rtr tenete eed GTL goto local sirsiran iiaei Eka DCL device clear 2 boo eR E E E d SDC selective device clear cccssscceesssccssseeessseeeessteessseeesssesees GET group executive trigger o
17. up to 32 characters see B STATe lt b gt Enable or disable text message mode Note C Note RST has no effect on the display circuitry and user defined text messages DI SPlay ENABle b Control display circuitry Parameters b 0 or OFF Disable display circuitry 1 or ON Enable display circuitry This command is used to enable and disable the front panel display circuitry When disabled the instrument operates at a higher speed While disabled the display is blank All front panel controls except LOCAL are disabled Normal display operation can be resumed by using the ENABle command to enable the display or by putting the power supply into local DISPlay TEXT DATA lt a gt Define message on display DISPlay WINDow 1 TEXT DATA lt a gt Parameters lt a gt ASCII characters for message Types String aa a or aa a Indefinite Block 0aa a This command defines a text message for the display A message is made up of 32 characters and starts on the top line of the display and wraps down to the bottom line Spaces are counted as characters and can be used to properly position the message on the display If your message is less than 32 characters the appropriate number of spaces are added at the end If your mes sage is greater than 32 characters it will not be displayed On power up the message is a string of 32 spaces DISPlay FORMat and SYSTem 10 3 An indefinite block message must be the
18. 500mA Range 0mA to 500mA in 0 5mA steps TRIGGER DELAY 0 to 100ms in 10ps steps INTERNAL TRIGGER DELAY 25us HIGH LOW AVERAGE MODE Measurement Aperture Settings 33 3us to 833ms in 33 3ps steps Average Readings 1 to 100 BURST MODE Measurement Aperture 33 3ys Conversion Rate 3600 second typical Number of Samples 1 to 5000 Transfer Samples Across IEEE Bus in Binary Mode 4800 bytes second typical LONG INTEGRATION MODE Measurement Time 850ms 840ms to 60 seconds in 16 7ms 20ms steps GENERAL ISOLATION low earth 22V DC max PROGRAMMING IEEE 488 2 SCPI USER DEFINABLE POWER UP STATES 5 REAR PANEL CONNECTOR 8 position quick disconnect terminal block for output 4 sense 2 and DVM 2 TEMPERATURE COEFFICIENT outside 23 C 5 C Derate accuracy specification by 0 1 x specification C OPERATING TEMPERATURE 0 to 35 C Full power 0 to 50 C Derate to 70 STORAGE TEMPERATURE 20 to 70 C HUMIDITY lt 80 35 C non condensing POWER CONSUMPTION 150VA max REMOTE DISPLAY KEYPAD OPTION Disables standard front panel DIMENSIONS 89mm high x 213mm wide x 360mm deep 3 in x 8 in x 14e in SHIPPING WEIGHT 5 4kg 12 lbs INPUT POWER 100V 240V AC 50 or 60Hz auto detected at power up WARRANTY Two years parts and labor on materials and workmanship EMC Conforms with European Union Directive Directive 89 336 EEC EN 55011 EN 50082 1 EN 61000 3 2 and 61000 3 3 FCC part 15 class B
19. DVMeter Measure DVM input LINTegration Perform long integration current measurements When the MEASure command is sent the specified function is selected and then the READ is executed When the MEASure ARRay command is sent the specified function is selected and the READ ARRay command is executed See READ and READ ARRay for details If a function is not specified the measurement s will be performed on the function presently selected NOTE There are no AVERage commands for long integration measurements The array size for long integration readings is fixed at one Therefore MEASure LINTegration and MEASure ARRay LINTegration are basically the same 10 DISPlay FORMat and SYSTem e DISPlay subsystem Covers the SCPI commands that are used to control the display e FORMat subsystem Covers the SCPI commands to configure the format that read ings are sent over the bus e SYSTem subsystem Covers miscellaneous SCPI commands 10 2 DISPlay FORMat and SYSTem DISPlay subsystem The display subsystem controls the display of the power supply and is summarized in Table 10 1 This subsystem also applies to Model 2303B if using Model 2304 DISP remote display module Table 10 1 SCPI commands display Command Description Default Ref DISPlay ENABle lt b gt Turn front panel display on or off see A WINDow 1 Note TEXT Text messages DATA lt a gt Define ASCII message a
20. Getting Started 1 11 If you want the Model 2303 or 2303B to power up with the output on you must use SAV5 SAV6 SAV7 SAV8 or SAV9 as the power on setup For the SAV5 power on setup the power supply will power up to the SAVO settings and the output will be on or off depending on the output state when the setup was saved as SAVO For example assume the output is on and the setup is saved as SAVO With SAVO as the power on setup the power supply will power up with the output off With SAV5 as the power on setup the power supply will power up with the output on Power On Setups NOTE _ SAVS through SAV9 are not available for the Model 2303 PJ Models 2303 2303B and 2303PJ SAVO output off SAV 1 output off SAV2 output off SAV3 output off SAVA output off Models 2303 and 2303B SAV5 SAVO setup with output on or off SAV6 SAVI setup with output on or off SAV7 SAV2 setup with output on or off SAV8 SAV3 setup with output on or off SAV9 SAVA setup with output on or off NOTE For GPIB operation the setups are saved and recalled using the SAV RCL and RST commands See Section 8 for details The power on setup is selected using the SYSTem POSetup command Section 10 Menu Many aspects of operation are configured from the menu that is summarized in Table 1 2 Use the following rules to navigate through the menu structure NOTE The menu key is used to access the menu structure However if in remote for IE
21. IEEE 488 connectors The IEEE connector on the power supply is shown in Figure 6 1 Figure 6 1 IEEE 488 connector ARES epr 22 VOLTS MAX LINE RATING 100 120VAC 200 240VAC 50 60 HZ iet he coals ASQVA MAX bunde dee source ow iy eer OUTPUT x CONTROL ISMA OVA VDC MAX A SZ REMOTE DISPLAY OPTION IEEE 488 Connector IEEE 488 CHANGE IEEE ADDRESS iH FRONT PANEL MENU C NOTE To minimize interference caused by electromagnetic radiation use only shielded IEEE 488 cables Available shielded cables from Keithley are Models 7007 1 and 7007 2 For a multi unit test system you can daisy chain the instruments to the controller by connect ing an IEEE cable from one unit to another Most controllers are equipped with an IEEE 488 style connector but a few may require a dif ferent type of connecting cable See the controller s instruction manual if it is not equipped with an IEEE 488 style connector GPIB Operation 6 3 Primary address The power supply ships from the factory with a GPIB address of 16 You can set the address to a value of 0 to 30 Do not assign the same address to another device or to a controller that is on the same GPIB bus The GPIB address is checked and or changed from the menu which is accessed by pressing the MENU key NOTE Table 1 2 in Section 1 shows the menu structure Rules to navigate the menu follow the table Once in the menu select GPIB menu and t
22. LONG INTEGRATION display type 5 Observe the long integration readings on the display Long Integration Measurements 4 7 General notes Make sure the voltage and current settings are appropriate for detecting pulses If a pulse timeout occurs no pulses detected current will not be measured i e A and the NO PULSE message will be displayed Pulses are not detected with the output off With the output on pulses will not be detected if the trigger level is too low or too high Perform the Determining correct trigger level procedure to find an appropriate trigger level While the NO PULSE message is displayed the instrument continues to search for a pulse The search can be terminated by pressing any front panel key The NOT TRIG message replaces the NO PULSE message To restart the search press any arrow key while displaying long integration readings The timeout or pulse detection will need to elapse before the display changes To stop taking long integration readings press any front panel key As long as the instrument remains in the long integration display state the measurement process can be resumed by pressing an arrow key While readings are not being taken the bottom line displays the last valid long integration reading or dashes if no pulse detected before being stopped Determining correct trigger level long integration 1 If using Model 2303 PJ make sure it is on the same current ran
23. Measurement Category II connections require protection for high transient over voltages often as sociated with local AC mains connections Assume all measurement control and data I O connections are for connection to Category I sources unless otherwise marked or described in the Manual Exercise extreme caution when a shock hazard is present Lethal voltage may be present on cable connector jacks or test fixtures The American National Standards Institute ANSI states that a shock hazard exists when voltage levels greater than 30V RMS 42 4V peak or 60VDC are present A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring Operators of this product must be protected from electric shock at all times The responsible body must ensure that operators are prevented access and or insulated from every connection point In some cases connections must be exposed to potential human contact Product operators in these circumstances must be trained to protect themselves from the risk of electric shock If the circuit is capable of operating at or above 1000 volts no conductive part of the circuit may be exposed Do not connect switching cards directly to unlimited power circuits They are intended to be used with impedance limited sourc es NEVER connect switching cards directly to AC mains When connecting sources to switching cards install protective de vices to limit fault current and voltage to the c
24. Tables Table 11 6 STATus command summary Default Command Description parameter SEPI STATus Note 1 y MEASurement Path to control the measurement event registers EVENt Read the event register Note 2 ENABle lt NRf gt Program the enable register Note 3 ENABle Read the enable register CONDition Read the condition register OPERation Path to control the operation status registers Y EVENt Read the event register Note 2 Y ENABle lt NRf gt Program the enable register Note 3 Y ENABle Read the enable register V CONDition Read the condition register V QUEStionable Path to control the questionable status registers V EVENt Read the event register Note 2 y ENABle lt NRf gt Program the enable register Note3 vV ENABle Read the enable register V CONDition Read the condition register V PRESet Return status registers to default states V QUEue Path to access error queue V NEXT Read the least recent error message Note 4 y ENABle lt list gt Specify error and status messages for queue Note 5 V ENABle Read the enabled list of messages Y DISable lt list gt Specify messages not to be placed in queue Note 5 Y DISable Read the disabled messages CLEar Clear all messages from error queue are explained by the following notes Power up and CLS Clears all bits of the registers 2 Event registers 3 Enable registers 4 Error queue 5 En
25. a IMS PSCULO EAEE E E stesaceasesibseeesbest Witesesciaoetens Options and accessories 0 eee ee eee eeeceeeeeeeeseeeeeeseeseeseeeseeseeeaeeneeeas Power supply overview sese een eene Remote display option eseseeeeeeeeeeennene nennen Dg Be aas Line power connection sissies onnies seesi eseas Fuse replacement ssesessecesssoseesssisossssoessesessusiroessevoesssonsssresouisresresses Power up sequenge eere doe hetero petet eee Rei Re Display tiodes rere rte ttti rie Lee Deed Default settings ie roe i ee ipee eee Setups Save Power on and Recall sss lig M Rules to navigate MENU esee eee SCPI programming ere erce rentes e te ne HER CHAR HR ERE RE Pe PARS 2 Basic Power Supply Operation TRSPCORMECUIONS d M Outputting voltage and current sesesssseeeeeneeeene Setting output voltage and current limit esse o sc p aS SCPI programming outputting voltage and current Reading back V and I sese Actual V and I display mode see Measurement configuration eseeseeseeeeeeeeerenee eee SCPI programming measure V and I and DVM input Independent voltage measurements DVM sess D
26. all instruments connected whether power is turned on or not Also describe signal source Where is the measurement being performed factory controlled laboratory out of doors etc What power line voltage is used Ambient temperature F Relative humidity Other Any additional information If special modifications have been made by the user please describe Be sure to include your name and phone number on this service form Index E Emulation command C 1 Error queud 7 18 A Error and status messaged6 6 B 1 Actual V and I display mode 2 11 Event enable registerd 7 16 Average readings count 3 3 3 5 Event register 7 15 B F Basic power supply operatio 2 1 FETCh 9 2 FETCh ARRayT92 C Fluke PM2811 power supply emulation Clearing registers and queue 7 4 command C 5 ra tammond FORMat BORDer name FORMat DATA type 10 4 Command wordde 1 FORMat subsystem 10 4 Condition registers 7 15 Connection Front panel aspects of GPIB operatior 6 6 Contact information 1 2 Fi replacemen 1 7 Controlling the relay 5 5 Current E G General bus commands 6 4 D General pene DCL device clear 6 5 General ett Default MIS Getting started m Determining correct trigger level OE Tae OUP execntiye trigeer 6 5 GPIB bus connectiond 6 2 1 integrati 4 3 Hi Mii NE GPIB operatior 6 1 Determining correct trigger level pus local 25 pulse ie or go to local 6 5
27. by a code number Negative numbers are used for SCPI defined messages and positive numbers are used for Keithley defined messages The messages are listed in Appendix B On power up all error messages are enabled and will go into the error queue as they occur Status messages are not enabled and will not go into the queue As listed in Table 7 7 there are commands to enable and or disable messages For these commands the lt list gt parameter is used to specify which messages to enable or disable The messages are specified by their codes The following examples show various forms for using the list parameter lt list gt 110 Single message 110 222 Range of messages 110 through 222 110 222 220 Range entry and single entry separated by a comma Il When you enable messages messages not specified in the list are disabled When you disable messages each listed message is removed from the enabled list Status Structure 7 19 NOTE To prevent all messages from entering the error queue send the enable command along with the null list parameter as follows STATus QUEue ENABle Table 7 6 SCPI commands error queue Command Description Default STATus STATus subsystem QUEue Read error queue Note 1 NEXT Read and clear oldest error status message ENABle lt list gt Specify error and status messages for error queue Note 2 ENABle Read the enabled messages DISable lt list gt
28. byte Typically serial polling is used by the controller to determine which of several instruments has requested service with the SRQ line Status Structure 7 9 Status byte and service request commands The commands to program and read the status byte register and service request enable regis ter are listed in Table 7 2 For details on programming and reading registers see Programming enable registers and Reading registers NOTE To reset the bits of the service request enable register to 0 use 0 as the parameter value for the SRE command i e SRE 0 Table 7 2 Command commands status byte and service request enable registers Command Description Default STB Read status byte register SRE NRf Program the service request enable register 0 to 255 Note SRE Read the service request enable register Note CLS and STATus PRESet have no effect on the service request enable register Programming example read status byte The following command sequence enables EAV error available sends an invalid command and then reads the status byte register CLS Clear Status Byte Register SRE 4 Enable EAV BAD COMMand Send an invalid command to generate an error STB Read status byte The value 68 will be returned to indicate that bits B2 EAV and B6 MSS of the Status Byte Register are set 7 10 Status Structure Status register sets As shown in Figure 7 1 there are
29. four status register sets in the status structure of the power supply standard event status operation event status measurement event status and questionable event status Register bit descriptions Standard event status The used bits of the standard event register shown in Figure 7 4 are described as follows Bit BO operation complete Set bit indicates that all pending selected device opera tions are completed and the power supply is ready to accept new commands This bit only sets in response to the OPC command See Section 8 for details on OPC Bit B2 query error QYE Set bit indicates that you attempted to read data from an empty output queue Bit B3 device dependent error DDE Set bit indicates that an instrument operation did not execute properly due to some internal condition Bit B4 execution error EXE Set bit indicates that the power supply detected an error while trying to execute a command Bit B5 command error CME Set bit indicates that a command error has occurred Command errors include IEEE 4882 syntax error power supply received a message that does not follow the defined syntax of the IEEE 488 2 standard Semantic error power supply received a command that was misspelled or received an optional IEEE 488 2 command that is not implemented The instrument received a group execute trigger GET inside a program message Bit B6 user request URQ Set bit
30. indicates that the LOCAL key on the power sup ply front panel was pressed Bit B7 power ON PON Set bit indicates that the power supply has been turned off and turned back on since the last time this register has been read Status Structure 7 11 Figure 7 4 Standard event status ESR To ESB bit PON URQ CME B15 B8 B7 B6 B5 EXE B4 DDE QYE B3 B2 B1 OPC BO of Status Byte amp OR Register ESE NR ESE V Decimal Weights PON URQ CME EXE DDE QYE oPc B15 B8 B7 B6 B5 B4 B3 B2 BT BO 128 64 32 16 8 4 1 27 2 25 24 2 2 2 PON Power On URQ User Request CME Command Error EXE Execution Error DDE Device Dependent Error QYE Query Error OPC Operation Complete amp Logical AND OR Logical OR Standard Event Register Standard Event Enable Register 7 12 Status Structure Operation event status The used bits of the operation event register shown in Figure 7 5 are described as follows Bit B3 current limit CL Set bit indicates that the output is in current limit This bit clears when the instrument is no longer in current limit Bit B4 current limit tripped CLT Set bit indicates that the output has turned off due to a
31. limits of Table 2 6 can cause damage to the power supply that is not covered by the warranty Programming examples Basic Power Supply Operation 2 15 O utputting and reading back V and I The following command sequence demonstrates how to output voltage and current and read back measure the actual voltage and current VOLT 5 SENS CURR CURR TYPE SENS FUNC SENS NPLC SENS AVER OUTP ON READ SENS FUNC READ DVM measurements input of the power supply CURR RANG AUTO ON 750e 3 TRIP VOLT 2 5 CURR Set output voltage to 5V Enable auto range for current Set current limit to 750mA Select Trip mode for current limit Select the voltage measurement function Set integration rate to 2 PLC Set average reading count to 5 Turn on the power supply output Trigger 5 voltage measurement conversions and return the average of those 5 conversions Select current measurement function Trigger 5 current measurement conversions and return the average of those 5 conversions The following command sequence demonstrates how to measure voltage applied to the DVM SENS FUNC S ENS NPLC SENS AVER READ ARR DVM 5 10 Select the DVM Input function Set integration rate to 5 PLC Set average reading count to 10 Trigger and return 10 readings 2 16 Basic Power Supply O peration Pulse Current Measurements e Overview Provides an overview of the puls
32. maximum limits see specifications Failure to do so could result in personal injury or death Test connections to the power supply are made at the rear panel using a quick disconnect OUTPUT DVM IN connector Keithley part number CS 846 Figure 1 1B shows where the connector plugs in Use up to 14 AWG wire for the screw terminals of the connector Once the connector is wired up plug it into the rear panel and tighten the captive retaining screws Figure 2 1 shows typical power supply connections to the device under test NOTE Source VO terminals are rated up to 10A maximum per pin Two sets of Source and Source terminals are available This configuration allows you to wire source connections in parallel to reduce the effects of wire impedance or to have two sep arate loads The two Source pins and the two Source pins are internally con nected to respective terminals on the PC board Figure 2 1 Typical connections Quick External Disconnect Test Connector Circuitry Part CS 846 m DVM DVM Input DVM Q Source Source i Sense i Output Sense DUT Source l l Source E Basic Power Supply Operation 2 3 O utputting voltage and current The fundamental process to output voltage and current is to 1 set the output voltage and cur rent limit values and 2 press the OPERATE key The details
33. mode the SET key will select it The V and I DACs are updated in real time Therefore if the output is on the output is updated immediately when a value is altered After pressing SET to exit the output settings mode the instrument returns to the previous display mode or front panel menu O perate The OPERATE key is used to control the output of the power supply This key toggles the output between on and off While in one of the display modes output ON or OFF is displayed in the upper right hand corner of the display The key is active in any front panel menu or display mode In menus the on off state of operate is not displayed Note that DVM measurements can be performed with the output off SCPI programming outputting voltage and current The commands to output voltage and current are summarized in Table 2 3 The Outputting and reading back V and I programming example at the end of this section demonstrates how to use these commands Table 2 3 SCPI commands outputting voltage and current Commands Description Default Ref SENSe SENSe subsystem CURRent Current function RANGe Set current measurement range UPPer lt n gt Specify expected current in amps 0 to 5 5 0 A AUTO lt b gt Enable or disable auto range OFF B SOURce SOURce subsystem VOLTage lt n gt Set voltage amplitude in volts 0 to 15 1mV resolution 0 0 C CURRent lt n gt Set current limit value in amps 0 to 5 100A resol
34. next command level An exception is when the path pointer detects a semicolon which is used to separate com mands within the program message see next rule When the path pointer detects a colon that immediately follows a semicolon it resets back to the root level The path pointer can only move down it cannot be moved up a level Executing a com mand at a higher level requires that you start over at the root command Using common and SCPI commands in the same message Both common commands and SCPI commands can be used in the same message as long as they are separated by semicolons A common command can be executed at any command level and will not affect the path pointer Example stat oper enab lt NRf gt ESE lt NRf gt Program message terminator PMT Each program message must be terminated with an LF line feed EOI end or identify or an LF EOI The bus will hang if your computer does not provide this termination The following example shows how a program message must be terminated outp on lt PMT gt Command execution rules e Commands execute in the order that they are presented in the program message Aninvalid command generates an error and is not executed Valid commands that precede an invalid command in a multiple command program message are executed Valid commands that follow an invalid command in a multiple command program message are ignored 6 12 GPIB Operation Respo
35. of this process are discussed as follows Setting output voltage and current limit The output capabilities of the power supply are shown in Figure 2 2 Figure 2 2A shows the output capabilities for the 5A and AUTO measurement ranges Notice that when voltage is set to more than 9V the maximum current limit is 3A Figure 2 2 O utput capabilities I Limit 5A A V Source Iy 15V A 5A or AUTO Measurement Range l Limit T V Source B 5mA Measurement Range Models 2303 and 2303B l Limit 0 6A V Source 15V C 500mA Measurement Range Model 2303 PJ 2 4 Basic Power Supply O peration The current limit setting for the 5 AMPS and AUTO ranges is remembered by that range For the following examples assume the current limit setting on the 5 amps range is 3A Models 2303 and 2303B Selecting the 5 MILLIAMPS range defaults the current limit setting to 1A since that is the maximum allowable setting on that range Toggling back to the 5 amps range reinstates the 3A limit If the current limit value on the 5 amps range is lt 1A the limit on the 5 milliamps range will be the same when switching from the 5A range to the 5 milliamps range Model 2303 PJ Selecting the 500 milliamps range defaults the current limit setting to 0 6A since that is the maximum allowable setting on that range Toggling back to the 5 amps range reinstates the 3A limit If the current limit value on the 5 amps range is lt 0 6A the limit
36. only command in the program message or the last command in the program message If you include a command after an indefinite block message on the same line it will be treated as part of the message and is displayed instead of executed Use the next command to enable the text message mode DISPlay TEXT STATe lt b gt Control message Parameters lt b gt OorOFF Disable text message lorON Enable text message This command enables or disables the text message mode When enabled the text message is displayed If no message is defined a string of 32 spaces is displayed When disabled the mes sage is removed from display The display returns to the normal display state A text message remains displayed only as long as the instrument is in remote Taking the instrument out of remote by pressing the LOCAL key or sending GTL cancels the message and disables the text message mode 10 4 DISPlay FORMat and SYSTem FORMat subsystem The commands for this subsystem are used to select the data format for transferring instru ment readings over the bus These commands are summarized in Table 11 2 NOTE The FORMat commands are only used if the exponential GPIB output format is se lected The output format is selected from output format of the GPIB menu item of the menu see Output Format in Section 6 for details Table 10 2 SCPI commands data format Command Description Default Ref FORMat DATA type Specify data f
37. output format Long Integration Measurements C SENSe LINTegration SEARch lt b gt Boolean Parameters OFF or 0 The search will stop after the first timeout period expires The search can be restarted by enabling the search or by sending a trigger reading command such as READ 4 9 ONor 1 The instrument will continue to search for a pulse after the timeout period expires Therefore with a long timeout setting and the search enabled the instrument may appear locked up while it is searching for the pulse to start the long integration In addition the time needed to execute code after timing out and to start the pulse search is fast compared to timeout settings Hence with no pulse detection and search enabled the power supply is mostly searching for the pulse D SENSe LINTegration FAST b Boolean Parameters OFF or 0 The instrument searches for pulses when it receives TLEVel commands to determine if the level value will cause pulses to be detected In addition the unit will take background readings between user trigger commands to determine if the pulse still exists ON or 1 The unit does not search for pulses when it receives a TLEVel command and will not take background readings between user trigger commands Therefore the pulse trigger timeout bit in the measurement event register is not updated unless a user trigger command is sent Plus the NO PULSE message will only appear after receiv
38. power supply to talk Rule 2 The complete response message must be received by the computer before another program message can be sent to the power supply Status Structure Overview Provides an operational overview of the status structure for the power supply Clearing registers and queues Covers the actions that clear reset registers and queues Programming and reading registers Explains how to program enable registers and read any register in the status structure Status byte and service request SRQ Explains how to program the status byte to generate service requests SRQs Shows how to use the serial poll sequence to detect SRQs Status register sets Provides bit identification and command information for the four status register sets standard event status operation event status measurement event sta tus and questionable event status Queues Provides details and command information on the output queue and error queue 7 2 Status Structure Overview The power supply provides a series of status registers and queues allowing the operator to mon itor and manipulate the various instrument events The status structure is shown in Figure 7 1 The heart of the status structure is the status byte register This register can be read by the users test pro gram to determine if a service request SRQ has occurred and what event caused it Status byte and SRQ The status byte register receives
39. pulse measurement high low or average NOTE For details on display modes see Display modes in Section 1 Pulse current measurement procedure The following steps summarize the procedure to perform pulse measurements 1 de For Model 2303 PJ select the desired measurement range 5A or 500mA from the CURRENT RANGE item of the menu For Models 2303 and 2303B pulse measure ments are automatically performed on the 5A range From the PULSE CURRENT item of the menu set the trigger level and delay integra tion times and average readings count As explained in Section 2 set the output voltage and current limit and press OPERATE Press the DISPLAY key and select the PULSE CURRENT display type Use the A or v key to display the desired pulse measurement PULSE HIGH PULSE LOW or PULSE AVG NOTES If no pulses are detected current will not be measured i e A and the NO PULSE message will be displayed The NO PULSE message is displayed with dashes or the last valid pulse reading Dashes are shown if the pulse current measure ment settings are not appropriate for detecting pulses The last valid pulse is shown if the pulse disappears while taking background readings and no change in pulse settings was made Pulses are not detected with the output off With the output on pulses will not be detected if the trigger level is too low or too high Perform the following procedure to find an appropriate trigger level Make s
40. replacement and the power up sequence Display modes Explains the four display modes of the power supply Default settings Lists the factory default settings and explains how to save and recall settings Menu Provides a table that summarizes the menu items and includes rules to navigate the menu structure SCPI programming Explains how SCPI commands are presented in this manual 1 2 Getting Started General information Warranty information Warranty information is located at the front of this manual Should your power supply require warranty service contact the Keithley representative or authorized repair facility in your area for further information When returning the instrument for repair be sure to fill out and include the service form at the back of this manual to provide the repair facility with the necessary information Contact information If you have any questions after reviewing this information please contact your local Keithley representative or call one of our Applications Engineers at 1 800 3735 U S and Canada only Worldwide phone numbers are listed at the front of this manual Safety symbols and terms Keithley uses a standard set of safety symbols and terms that may be found on an instrument or in its manual Ifa screw is present connect it to safety earth ground using the wire recommended in the user documentation The A symbol on an instrument indicates that the user should ref
41. termi nals Current Iink flows into the positive terminal ofthe power supply rather than out of it Current readback is negative NOTE During sink operation the power supply does not regulate current It acts only as a constant voltage load not as a constant current load Figure 2 5 illustrates an application for sink operation In Figure 2 5 the test circuit is a bat tery charging circuit the power supply acts as a constant voltage battery load Figure 2 5 Sink operation example E Circuit 3 0V sf 42V l ik E Power Supply To keep the power supply in the current sink mode safely maintain the following condition Ensure that the test circuit voltage remains greater than the programmed supply voltage Ensure that the maximum sink current falls within the limits specified in Table 2 6 Table 2 6Table 2 6 Sink current limits Programmed Maximum allowable sink current supply voltage OV to 5V 2 0A 5V to 15V 2 0A 0 1A V x Programmed supply voltage 5V CAUTION During sink operation the current limit circuit of the power supply is not operational because it only limits current by limiting power supply output voltage During sink operation your test circuit supplies net input voltage over which the power supply has no control Therefore you must ensure that your test circuit sources current within the limits of Table 2 6 Failure to source current within the
42. to be included in the program message For example FORMat DATA These brackets indicate that DATA is implied optional and does not have to be used Thus the above command can be sent as FORMat or FORMat DATA Notice that the optional command is used without the brackets When using optional com mand words in your program do not include the brackets Parameter types The following are some of the more common parameter types e lt b gt Boolean Used to enable or disable an instrument operation 0 or OFF disables the operation and 1 or ON enables the operation Example DISPlay TEXT STATe ON Enable text message mode of display name Name parameter Select a parameter name from a listed group Example lt name gt LIMit TRIP CURRent LIMit TYPE TRIP Turn output off when current limit reached 6 8 GPIB Operation e NR Numeric representation format This parameter is a number that can be expressed as an integer e g 8 a real number e g 23 6 or an exponent 2 3E6 Example SENSe AVERage 5 Set average count value to 5 e lt n gt Numeric value A numeric value parameter can consist of an NRf number or one of the following name parameters DEFault MINimum MAXimum When the DEFault parameter is used the instrument is programmed to the RST default value When the MINimum parameter is used the instrument is programmed to the lowest allowable value When the MAXimum paramete
43. 3 1 Pulse current measurements Pulse timeou ouevef FATT RCL lt NRf gt recal READT 9 3 READ ARRay Reading back V and 1 2 11 Reading registerg 7 5 Register bit descriptiond 7 10 Relay contro 5 1 Remote display optio Remote indicator and local key 6 6 REN remote enable Response messages 6 12 RST es 8 4 Rules to navigate MENU 1 13 Safety symbols and termg 1 2 Test connectiong 2 2 SAV lt NRf gt sav 8 4 TRG trigge 8 4 SCPI command subsystems reference Trigger dela tables 11 2 Trigger delay and trigger leve SCPI programming 1 13 3 7 4 9 5 5 Trigger edgd 4 3 SCPI programming measure V and I and Trigger edge and trigger leve 4 6 DVM inpu Trigger leve SCPI programming DV TST self test quer SCPI programming outputting voltage and WAI wait to continud 8 5 Warranty informatio curren 2 8 W SCPI tables 11 1 SDC selective device clear Selecting the 488 1 protoco Serial polling and SR q 7 8 Service request enable registed 7 7 Setting output voltage and current limi 2 3 Setups Save Power on and Recal Signal oriented measurement commands 9 1 Sink operatior 2 14 SPE SPD serial polting 6 5 Specifications Status byte and service request SRQ Status byte and service request command4 7 9 Status byte and SR Q 7 2 Status byte registe Status register set Status st
44. 555 Fax 81 3 5733 7556 2FL URI Building 2 14 Yangjae Dong Seocho Gu Seoul 137 888 82 2 574 7778 Fax 822 574 7838 Postbus 559 4200 AN Gorinchem 0183 63 53 33 Fax 0183 63 08 21 c o Regus Business Centre Frosundaviks All 15 4tr 16970 Solna 08 50 90 46 00 Fax 08 655 26 10 13F 3 NO 6 Lane 99 Pu Ding Road Hsinchu Taiwan ROC 886 3 572 9077 Fax 886 3 572 9031 Copyright 2003 Keithley Instruments Inc Printed in the U S A 5 03
45. Bangalore 560 025 080 212 80 27 Fax 080 212 80 05 ITALY Viale San Gimignano 38 20146 Milano 02 48 39 16 01 Fax 02 48 30 22 74 JAPAN New Pier Takeshiba North Tower 13F 11 1 Kaigan 1 chome Minato ku Tokyo 105 0022 81 3 5733 7555 Fax 81 3 5733 7556 KOREA 2FL URI Building 2 14 Yangjae Dong Seocho Gu Seoul 137 888 82 2 574 7778 Fax 82 2 574 7838 NETHERLANDS Postbus 559 4200 AN Gorinchem 0183 63 53 33 Fax 0183 63 08 21 SWEDEN c o Regus Business Centre Frosundaviks All 15 4tr e 16970 Solna 08 50 90 46 00 Fax 08 655 26 10 TAIWAN 13F 3 NO 6 Lane 99 Pu Ding Road Hsinchu Taiwan ROC 886 3 572 9077 Fax 886 3 572 9031 5 03 Model 2303 2303B 2303 PJ High Speed Power Supply User s Manual 1998 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Sixth Printing August 2003 Document Number 2303 900 01 Rev F Manual Print History The print history shown below lists the printing dates of all Revisions and Addenda created for this manual The Revision Level letter increases alphabetically as the manual undergoes sub sequent updates Addenda which are released between Revisions contain important change in formation that the user should incorporate immediately into the manual Addenda are numbered sequentially When a new Revision is created all Addenda associated with the previous Revision of the manual are incorporated into the new Revision of the manual Each n
46. DISPlay FORMat and SYSTe DISPlay ENABle lt b H DISPlay subsystem 10 2 HP 6632A power supply emulation DISPlay TEXT DATA lt a gt Gmail Co DISPlay TEXT STATe lt b gt 10 3 Display mode 1 8 DVM input display modd 2 13 DVM measurement 2 15 DN identification quer IFC interface clear 6 4 Independent voltage measurements DVM Inspector 1 3 Integration time 4 3 4 5 Integration times 3 3 Introductior 6 2 Line power connectio LLO local lockout Long integration measurement procedurd 4 7 Long integration measurement Long integration display mode MEASure ARRay function 9 4 MEASure function Measurement configuratio Mend 1 11 Message exchange protocol 6 12 OPC operation completd 8 3 OPC operation complete query 8 3 42 8 Operate Options and accessories 1 3 Output forma Output queud 7 17 Outputting and reading back V and 1 2 15 Outputting voltage and current 2 3 Overvie Power supply overview 1 4 Power uj 1 6 Power up sequencq 1 7 Primary addresq 6 3 Program messages 6 10 Programming and reading re gisterd 7 5 Programming enable re sive 75 Programming examplq Programming example Programming example program and read measurement event registe 7 17 Programming syntax 6 7 Protocol differences 488 1 Pulse current display modd 3 5 Pulse current digitizatior 3 9 Pulse current measurement procedure 3 6
47. Drop 100myV typical 200myV typical RIPPLE AND NOISE 20Hz to 20MHz 3mV rms 8mvV p p typical REMOTE SENSE 1V max drop in each lead Add 2mV to the voltage load regulation specification for each 1V change in the negative output lead due to load current change DC CURRENT 2 Years 23 C x 5 C OUTPUT CURRENT 0 9V 5A max 9V 15V 3A max not intended to be operated in parallel COMPLIANCE ACCURACY 0 1696 5mA gt PROGRAMMED COMPLIANCE RESOLUTION 1 25mA READBACK ACCURACY 2303 SArange 0 2 400uA 5mA range 0 2 1A 2303 PJ 5A range 0 2 4004A 500mA range 0 2 40pA READBACK RESOLUTION 2303 5A range 100pA 5mArange O luA 2303 PJ 5A range 100pA 500mA range 10pA CURRENT SINK CAPACITY 0 5V 2A max 5V 15V Derate 0 1A per volt above 5V LOAD REGULATION 0 01 1mA LINE REGULATION 0 5mA STABILITY 0 01 50pA DIGITALVOLTMETER INPUT 2 Years 23 C 5 C INPUT VOLTAGE RANGE 0 to 20V DC INPUT IMPEDANCE 10 Q typical MAXIMUM VOLTAGE either input terminal WITH RESPECT TO OUTPUT LOW 3V 22V READING ACCURACY 0 0596 3mV READING RESOLUTION 1mV DC GENERAL MEASUREMENT TIME CHOICES 0 01 to 10 PLC in 0 01PLC steps AVERAGE READINGS to 10 READING TIME 8 31ms typical Specifications A 3 PULSE CURRENT MEASUREMENT OPERATION TRIGGER LEVEL 2303 5mA to 5A in 5mA steps 2303 PJ 5A Range 0mA to 5A in 5mA steps
48. EE 488 bus operation R displayed below ON OFF the menu key returns the instru ment to LOCAL operation 1 12 Getting Started Table 1 2 MENU structure Menu item Description Ref GPIB menu GPIB configuration Sec 6 Address Set primary address 0 to 30 Output format Select format for GPIB readings Exponential Return readings in exponent form i e 1 00000000 01 2 decimal places Return readings using 2 decimal places i e 10 00 3 decimal places Return readings using 3 decimal places i e 10 000 4 decimal places Return readings using 4 decimal places i e 10 0000 Keithley Reply with Keithley information to IDN Fluke Reply with Fluke information to IDN Current range Select current range Sec2 Models 2303 and 2303B 5A 5mA or AUTO Model 2303 PJ 5A 500mA or AUTO Integration rate Set integration rate in NPLC 0 01 to 10 Sec2 Average readings Set average reading count 1 to 10 Sec2 Save setup Save present setup in memory SAVO SAV4 Note 1 Recall setup Recall setup from memory RST SAVO SAV4 Note 1 Power on setup Select power on setup RST SAVO SAVA Note 1 Calibrate unit Calibrate Model 2303 2303B 2303 PJ see Service Manual Current lim mode Select current limit mode Limit Trip Limit Relay or Trig Relay Sec2 Output relay Close ONE or open ZERO relay control circuit Sec 5 Revision number Display firmware revision levels Note 2 Serial number Display serial number of the pow
49. ENU key to back out of the menu structure NOTE To select SCPI protocol use the aor keys in Step 4 to display SCPI before pressing ENTER When switching between the SCPI protocol and 488 1 protocol the instrument does not reset The GPIB protocol setting is saved in EEPROM and the unit will power up with that selected protocol until changed again The GPIB protocol can be changed over the bus If you use the following query to request the state of MEP you will know which protocol is enabled SYSTem MEP STATe If a 1 is returned MEP is enabled and the SCPI protocol is selected A 0 indicates that MEP is disabled and the 488 1 protocol is enabled To summarize 1 SCPI protocol 0 488 1 protocol Send the following commands over the GPIB to change the GPIB protocol between SCPI and 488 1 SYSTem MEP STATe 1 or ON Selects SCPI protocol SYSTem MEP STATe 0 or OFF Selects 488 1 protocol Models 2303 and 2303B GPIB 488 1 Protocol D 3 The following rules must be adhered to when sending this command with either parameter setting 1 The command must be the only command on the line or it must be the last command in the command string No command or query can be after this command on a line going to the power supply 3 After sending this command allow some time for the instrument to switch into the new mode and be ready for new commands before sending another command or query For example the fol
50. IMIT RELAY Current will be limited Remains on Tracks current limit state TRIP RELAY Current will trip Goes off Tracks current limit state LIMIT RELAY and TRIP RELAY available in Models 2303 and 2303B with firmware revision level A06 and higher LIM mode With the lim mode selected the output will remain on when the current limit is reached The LIM message will appear on the lower line of the display after the current reading indicator A or mA The message will clear when the limit condition is cleared The power supply can be taken out of the current limit by decreasing the output voltage or increasing the current limit value Note that increasing the current limit may compromise pro tection for the DUT While in the current limit the power supply is operating as a constant current source As long as the limit condition exists the power supply output current will remain constant Note that the output voltage is probably less than the programmed value when sourcing current NOTE The power supply does not provide LIM mode current limiting during sink operation TRIP mode With the trip mode selected the output will turn off when the current limit is reached The TRIP message will appear on the lower line of the display after the current read ing indicator A or mA The message will clear when the output is turned back on assuming it does not trip again due to a current limit condition LIMIT RELAY
51. LEVel lt NRf gt Models 2303 and 2303B Set trigger level in 0 0 amps 0 to 5 5mA resolution TLEVel Model 2303 PJ trigger level AMPs lt NRf gt Set trigger level in amps for 5A range 0 to 5 0 0 5mA resolution MILLiamp lt NRf gt Set trigger level in amps for 500mA range 0 to 0 0 0 5 0 5mA resolution TEDGe lt name gt Select trigger edge to initiate the measurement RISING RISING FALLING or NEITHER TimeOUT lt NRf gt Specify length of timeout 1 to 63 sec 16 SEARch lt b gt Enable or disable pulse search ON C FAST lt b gt Enable or disable long integrations fast readings OFF D READ Trigger and return one reading E A SENSe FUNCtion LINTegration The parameter name can instead be enclosed in single quotes as shown above B SENSe LINTegration TIME lt NRf gt 1 The time value sent is rounded down to the nearest step value which is based on the power line frequency For 60Hz the step value is 16 667 msec For 50Hz the step value is 20msec For example for 50Hz a time value of 10 025 seconds is between steps Therefore the integration period will round down to 10 020 seconds 2 When there is uncertainty about the actual integration time period use the TIME query command to read it 3 The response for TIME is affected by the GPIB output format For decimal formats the response has four decimal places otherwise it is in exponential format See Section 6 to select the
52. Model 2303 2303B 2303 P High Speed Power Supply Users Manual TEquipment An Interworld Highway LLC SNET A GREAMBBR MEASUR SOME ONFIDENCE WARRANTY Keithley Instruments Inc warrants this product to be free from defects in material and workmanship for a period of 2 years from date of shipment Keithley Instruments Inc warrants the following items for 90 days from the date of shipment probes cables rechargeable batteries diskettes and documentation During the warranty period we will at our option either repair or replace any product that proves to be defective To exercise this warranty write or call your local Keithley representative or contact Keithley headquarters in Cleveland Ohio You will be given prompt assistance and return instructions Send the product transportation prepaid to the indicated service facility Repairs will be made and the product returned transportation prepaid Repaired or replaced products are warranted for the balance of the original warranty period or at least 90 days LIMITATION OF WARRANTY This warranty does not apply to defects resulting from product modification without Keithley s express written consent or misuse of any product or part This warranty also does not apply to fuses software non rechargeable batteries damage from battery leakage or problems arising from normal wear or failure to follow instructions THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED
53. NT RANGE INTEGRATION RATE and the AVERAGE READINGS count can be checked or changed from the menu which is accessed by pressing the MENU key NOTE Table 1 2 in Section 1 shows the menu structure Rules to navigate the menu follow the table Current range Current range is linked with current limit Therefore as a general rule the user selects the current range before setting the current limit The current range can be changed at any time but selecting the lower range may change the current limit setting See Outputting voltage and cur rent in this section for details on current range and current limit Integration rate The integration reading rate ofthe instrument is specified as a parameter based on the num ber of power line cycles NPLC where 1 PLC for 60Hz line frequency is 16 67msec 1 60 In general the fastest integration time 0 01 PLC results in increased reading noise The slowest integration time 10 PLC provides the best common mode and normal mode rejection In between settings are a compromise between speed and noise The INTEGRATION RATE item of the menu is also used to set the reading rate for DVM measurements Note that it is not used to set the integration rate for pulse current and long inte gration measurements These measurements are covered in Sections 3 and 4 respectively 2 12 Basic Power Supply O peration Average readings The average reading count 1 to 10 specifies the number of measuremen
54. OR IMPLIED INCLUD ING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES NEITHER KEITHLEY INSTRUMENTS INC NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS INC HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES SUCH EXCLUDED DAM AGES SHALL INCLUDE BUT ARE NOT LIMITED TO COSTS OF REMOVAL AND INSTALLATION LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON OR DAMAGE TO PROPERTY KEITHLEY Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 440 248 0400 Fax 440 248 6168 1 888 KEITHLEY 534 8453 www keithley com Sales Offices BELGIUM Bergensesteenweg 709 B 1600 Sint Pieters Leeuw 02 363 00 40 Fax 02 363 00 64 CHINA Yuan Chen Xin Building Room 705 12 Yumin Road Dewai Madian Beijing 100029 8610 82251886 Fax 8610 82251892 FINLAND Halsuantie 2 00420 Helsinki Finland 09 53 06 65 60 Fax 09 53 06 65 65 FRANCE 3 all e des Garays 91127 Palaiseau C dex 01 64 53 20 20 Fax 01 60 11 77 26 GERMANY Landsberger Strasse 65 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Unit 2 Commerce Park Brunel Road Theale Berkshire RG7 4AB 0118 929 75 00 Fax 0118 929 75 19 INDIA 1 5 Eagles Street Langford Town
55. PC or OPC separated by a semicolon on the same line with a query see A exam ples in Table 8 2 If sent on separate lines an error occurs B OPC or OPC can be sent on the same line or a separate line with a command that is not a query C and D 8 4 Common Commands F Table 8 2 OPC and OPC commands Ref OPC OPC Comment A VOLTage OPC SENSe NPLC OPC Valid B VOLTage SENSe NPLC Not valid query interrupted error OPC OPC C CURRent 1 OPC SENSe NPLC 5 OPC Valid D CURRent 1 SENSe NPLC 5 Valid OPC OPC SAV NR save Save present setup in memory RCL lt NRf gt recall Return to setup stored in memory Parameters Memory location 0 0 1 Memory location 1 2 Memory location 2 3 Memory location 3 4 Memory location 4 Use the SAV command to save the present instrument setup configuration in memory for later recall Any control affected by RST can be saved by the SAV command The RCL com mand is used to restore the instrument to the saved setup configuration Five setup configurations can be saved and recalled NOTE The output is always off when a memory location is recalled However the instrument can be powered up with the output on See SYSTem POSetup in Section 10 for details RST reset Return power supply to RST defaults When the RST command is sent the power supply performs the following operations 1 Returns the instrument to the RST
56. Read standard event status register STATus STATus subsystem OPERation EVENt Read operation event register MEASurement EVENt Read measurement event register QUEStionable EVENt Read questionable event register Note Power up and CLS resets all bits of all event registers to 0 STATus PRESet has no effect 7 16 Status Structure Event enable registers As Figure 7 1 shows each status register set has an enable register Each event register bit is logically ANDed amp to a corresponding enable bit of an enable register Therefore when an event bit is set and the corresponding enable bit is set as programmed by the user the output summary of the register will set to 1 which in turn sets the summary bit of the status byte register The commands to program and read the event enable registers are listed in Table 7 5 For details on programming and reading registers see Programming enable registers and Read ing registers NOTE The bits of any enable register can be reset to 0 by sending the 0 parameter value with the appropriate enable command i e STATus OPERation ENABle 0 Table 7 5 Common and SCPI commands event enable registers Command Description Default Note ESE lt NRf gt Program standard event enable register see Parameters ESE Read standard event enable register STATus STATus subsystem OPERation Operation event enable r
57. Specify messages not to be placed in queue Note 2 DISable Read the disabled messages CLEar Clear messages from error queue SYSTem SYSTem subsystem ERRor Read error queue Note 1 CLEar Clear messages from error queue Notes 1 Power up and CLS empties the error queue STATus PRESet has no effect 2 Power up enables error messages and disables status messages CLS and STATus PRESet have no effect Programming example read error queue STAT QUE ENAB 000 900 Enable all Keithley defined messages dis able all SCPI defined messages STAT QUE Return oldest message 7 20 Status Structure Common Commands 8 2 Common Commands Overview Common commands are device commands that are common to all devices on the bus These commands are designated and defined by the IEEE 488 2 standard Common commands are listed in Table 8 1 Note that detailed information on the Common Commands to program and read status registers is provided in Section 7 Table 8 1 IEEE 488 2 common commands and queries Mnemonic Name Description Ref CLS Clear status Clears all event registers and error queue Sec 7 ESE lt NRf gt Event enable command Program the standard event enable register Sec 7 ESE Event enable query Read the standard event enable register Sec 7 ESR Event status register query Read the standard event enable register and clear it Sec 7 IDN Identification query Returns the manufacturer
58. Tem With RST selected the power supply powers up to the RST default conditions Default con ditions are listed in the SCPI tables With SAVO 4 specified the power supply powers on to the setup that is saved in the specified memory location using the SAV command Section 8 Note that the instrument will power up with the output off For the Models 2303 and 2303B the SAV5 9 parameters can be used to power up the power supply with the output on It will assume the corresponding SAVO 4 setup including the saved state of the output For example assume the output was on when the setup was saved by SAV 2 If you select SAV7 as the power on setup the instrument will power up to the SAV2 setup and the output will be on However if the output was off when setup 2 was saved and power on setup is SAV7 then the instrument will power up with setup 2 values with the output off 11 SCPI Tables 11 2 SCPI Tables SCPI command subsystems reference tables Tables 11 1 to 11 7 summarize the commands for each SCPI subsystem The following list in cludes the SCPI subsystem commands and the table number where each command is summarized Table 11 1 DISPlay command summary Table 11 2 FORMat command summary Table 11 3 OUTPut command summary Table 11 4 SENSe command summary Table 11 5 SOURce command summary Table 11 6 STATus command summary Table 11 7 SYSTem command summary General notes Brackets are used to denote optional charact
59. VM input display mode serene Measurement configuration esee SCPI programming DVM essere nennen DINK Operatiotr 4 iere dein serere Ere ree ees o Programming examples esee Outputting and reading back V and I sss DVM measurements essere nennen 3 Pulse Current Measurements Qu Uu IrigBer level siaren eer trt e n DO Ut ein Ufa Trigger delay 12 2 2 5 c ont erm o Ret rtr eee sous Integration times 445i ten ertet e OH EE PUR REOR RS Average readings count eee eene Measurement configuration eeseseeeeeeeeeeren re een eee Current tanpe serseri ee PE REESE EUER RISE anatase ates Integration tes 5 eet a HERE NR eee thoes Average readings count esseseeseeeeeeeeen nennen en nennen Trigger delay and trigger level ees Pulse current display mode eee Pulse current measurement procedure sseeeeees Determining correct trigger level pulse current SCPI programming ceceni aneii rtr nri Pere RE A Pulse current digitization essere Programming examples esee 4 Long Integration Measurements COVER VIEW e Integration tne ashes ipee treten rb tai nerit ier ten epe enrique Trigger level
60. a drawer below the AC receptacle see Figure 1 1B At the top of the fuse drawer is a small tab At this location use a thin bladed knife or screwdriver to pry the fuse drawer open Slide the fuse drawer out to gain access to the fuse Note that the fuse drawer does not pull all the way out of the power module Snap the fuse out of the drawer and replace it with the same type 250V 2 0A 5 x 20mm time lag The Keithley part number is FU 81 CAUTION _ For continued protection against fire or instrument damage only replace the fuse with the type and rating listed If the instrument repeatedly blows fuses locate and correct the cause of the problem before replacing the fuse 4 Push the fuse drawer back into the power module Power up sequence On power up the power supply performs self tests on its EPROM and RAM NOTE Ifa problem develops while the instrument is under warranty return it to Keithley Instruments Inc for repair If the instrument passes the self tests the following information is briefly displayed Top line The model number and the IEEE 488 address are displayed At the factory the address is set to 16 Bottom line Firmware revision levels are displayed for the main board and the dis play board Also displayed is the detected line frequency After the power up sequence the instrument goes to the presently saved display type with the output off see Default settings 1 8 Getting Star
61. able disable error queue messages STATus PRESet No effect Power up and STATus PRESet Clears all bits of the registers CLS No effect Power up and CLS Clears the error queue STATus PRESet No effect Power up Clears list of messages CLS and STATus PRESet No effect Notes 1 Commands in this subsystem are not affected by RST The effects of cycling power CLS and STATus PRESet 11 7 11 8 SCPI Tables Table 11 7 SYSTem command summary Command Description Default SCPI parameter SYSTem VERSion Query SCPI version level Y ERRor Read and clear oldest message in error queue CLEar Clears error queue LFRequnecy Query power line frequency setting POSetup lt name gt POSetup Select power on setup RST or SAVx where X 0 to 4Model 2303 PJ x 0 to 9Model 2303 2303B Query power on setup A Specifications A 2 Specifications DC VOLTAGE OUTPUT 2 Years 23 C 5 C OUTPUT VOLTAGE 0 to 15V DC OUTPUT ACCURACY 0 05 10mV PROGRAMMING RESOLUTION 5mV READBACK ACCURACY 0 0596 3mV READBACK RESOLUTION 1mV OUTPUT VOLTAGE SETTLING TIME 5ms to within stated accuracy LOAD REGULATION 0 01 2mV LINE REGULATION 0 5mV STABILITY 0 01 0 5mV TRANSIENT RESPONSE TO 1000 LOAD CHANGE Transient Recovery Time 40ys to within 100mV of previous level lt 80ps to within 20mV of previous level Transient Voltage
62. ad ing For example with the average count set to 10 READ will trigger 10 pulse current measurement conversions and return and display the average of those 10 conversions 2 When requesting an array of readings FETCh ARRay READ ARRay or MEA Sure ARRay average count specifies the number of pulse current measurements to place in an array For example with the average count set to 10 READ ARRay will trigger and return 10 readings 3 For pulse current digitization use an array reading command such as READ ARRay to return the digitized readings 4 Signal oriented measurement commands e g READ are covered in Section 9 C SENSe PCURrent TIME The response for the query commands HIGH LOW and AVERage is affected by the GPIB output format For decimal formats the response has four decimal places otherwise it is in exponential format See Section 6 to select the output format D SENSe PCURrent SYNChronize lt b gt Boolean parameters ON or 1 Enables trigger synchronization for pulse current measurements A pulse current reading will not trigger until the specified trigger level is detected and the spec ified trigger delay period expires OFF or 0 Disables trigger synchronization and selects pulse current digitization See Pulse current digitization for details on digitizing a current pulse or waveform E TLEVel Commands A valid trigger level for detecting the pulse is needed whether trigg
63. age or current field keep pressing the SET key until the blinking stops The in strument can now display measured readings 1 Press the DISPLAY key to access the display menu 2 Press the or k ey until DVM INPUT is displayed 3 Press ENTER NOTE For details on display modes see Display modes in Section 1 Measurement configuration The INTEGRATION RATE and AVERAGE READINGS count for DVM measurements can be checked or changed from the menu which is accessed by pressing the MENU key NOTE Table 1 2 in Section 1 shows the menu structure Rules to navigate the menu follow the table These two measurement configuration menu items are the same ones used for actual V and I measurements See Reading back V and I Measurement configuration for details on integra tion rate and average reading count SCPI programming DVM The commands to perform actual V and I measurements are also used to perform DVM mea surements These commands are documented in Table 2 5 The DVM measurements programming example at the end of this section demonstrates how to use these commands to measure the DVM input 2 14 Basic Power Supply O peration Sink operation Whenever a test circuit sources a voltage that exceeds the programmed supply voltage the power supply automatically becomes a sink instead of a source It then dissipates power instead of supplying power while continuing to maintain the programmed supply voltage at its
64. ard Before operating an instrument make sure the line cord is connected to a properly grounded power receptacle Inspect the con necting cables test leads and jumpers for possible wear cracks or breaks before each use When installing equipment where access to the main power cord is restricted such as rack mounting a separate main input pow er disconnect device must be provided in close proximity to the equipment and within easy reach of the operator For maximum safety do not touch the product test cables or any other instruments while power is applied to the circuit under test ALWAYS remove power from the entire test system and discharge any capacitors before connecting or disconnecting ca 5 03 bles or jumpers installing or removing switching cards or making internal changes such as installing or removing jumpers Do not touch any object that could provide a current path to the common side of the circuit under test or power line earth ground Al ways make measurements with dry hands while standing on a dry insulated surface capable of withstanding the voltage being measured The instrument and accessories must be used in accordance with its specifications and operating instructions or the safety of the equipment may be impaired Do not exceed the maximum signal levels of the instruments and accessories as defined in the specifications and operating in formation and as shown on the instrument or test fixture panels or
65. ay of readings After sending either one of these com mands and addressing the power supply to talk the averaged reading or reading array is sent to the computer These commands do not affect the instrument setup These commands do not trigger measurements They return the last triggered averaged reading or reading array Note that they can repeatedly return the same reading or reading array Until there is a new triggered reading s these commands continue to return the old triggered reading s The number of readings to average or put in an array is set using the SENSe AVERage for voltage current and DVM readings or SENSe PCURrent AVERage for pulse current read ings command See Sections 2 and 3 for details Signal Oriented Measurement Commands 9 3 NOTES 1 A FETCh reading can be returned in exponent form i e 10V returned as 1 00000000E 01 or as a decimal reading i e 10V returned as 10 0000 10 000 or 10 00 The reading format is selected from the GPIB MENU OUTPUT FORMAT item of the menu see Output Format in Section 6 for details 2 FETCh ARRay readings are always sent in exponent form 3 There are no AVERage commands for long integration measurements The array size for long integration readings is fixed at one Therefore both FETCh and FETCh ARRay will return the last reading READ Trigger and return reading READ ARRay Trigger and return array of readings The READ command is used to trigger and re
66. ce Note that the output voltage is probably less than the programmed voltage value With TRIP selected the output will turn off when the current limit is reached OUT lt b gt Turn output on or off Parameters b 1 or ON Turn output on 0 or OFF Turn output off Query OUT Query state of power supply output Description This command is used to turn the power supply output on or off Note that DVM measurements can be performed with the output off C4 Emulation Commands VOUT Description IOUT Description ID Description Trigger and return an output voltage reading When this command is sent the power supply is triggered to measure the out put voltage After the power supply is addressed to talk the single voltage reading in x xxx format is sent to the computer This changes the function of the supply to be set for voltage Trigger and return an output current reading When this command is sent the power supply is triggered to measure the out put current Before the measurement is performed the 5A measurement range is selected AUTO range disabled After the power supply is addressed to talk the single current reading in y yyyy format is sent to the computer This changes the function of the sup ply to be set for current Identification This query responds with the model number of the instrument KI2303 K1I2303B or KI2303 PJ Emulation Commands C 5 Fluke PM2811 power supply emulati
67. ck peak current idle current and average current See Section 3 for details A long integration up to 60 seconds function is pro vided to measure average current of a low frequency pulse long period or a series of pulses See Section 4 for details Figure 1 2 Simplified power supply diagram Source V Source with I Limit DVM Digital Voltmeter 1 6 Getting Started Remote display option If the power supply must be mounted in a location where the display is not readily visible or the controls are not easily accessible the optional Model 2304 DISP Display Module can be used This display module includes all instrument controls and has a 9 foot cable so the power supply can be operated remotely from a more convenient location NOTE When the remote display is attached to a Model 2303B the power supply acts like a Model 2303 The remote display module plugs into the rear panel connector labeled REMOTE DISPLAY OPTION see Figure 1 1B When plugged in the main display module is disabled with the following message displayed REMOTE PANEL ENABLED When the remote display module is unplugged control returns to the main display module NOTE When connecting or disconnecting the 2304 DISP remote display allow a few sec onds for the power supply to recognize the action Fast repeated connects discon nects of the remote display may cause the power supply to hang or appear to hang Disconnect
68. computer using the binary format Bytes 2 10x4 1 43 for SREAL Bytes 2 10X8 1 83 for DREAL 10 6 DISPlay FORMat and SYSTem Figure 10 2 IEEE 754 double precision data format Header Byte 1 Byte 2 Byte 7 Byte 8 I I 10 i 7 017 o pr 07 e f S Bytes 3 4 5 and 6 not shown s sign bit 0 positive 1 negative e exponent bits 11 f fraction bits 52 Normal byte order shown For swapped byte order bytes sent in reverse order Header Byte 8 Byte 7 Byte 1 The Header is only sent once for each measurement conversion FORMat BORDer lt name gt Specify binary byte order Parameters lt name gt NORMal Normal byte order for binary formats SWAPped Reverse byte order for binary formats This command is used to control the byte order for the IEEE 754 binary formats For normal byte order the data format for each element is sent as follows Byte 1 Byte 2 Byte 3 Byte 4 Single precision Byte 1 Byte 2 eee Byte 8 Double precision For reverse byte order the data format for each element is sent as follows Byte 4 Byte 3 Byte 2 Byte 1 Single precision Byte 8 Byte 7 eee Byte 1 Double precision The 0 header is not affected by this command The header is always sent at the beginning of the data string for each measurement conversion The ASCII data format can only be sent in the normal byte order The SWAPped selection is ignored when the ASCII format is selected
69. cont Factory defaults RST Setting RST default Average time 33 usec Average readings 1 Trigger delay 0 00000 sec Trigger level Models 2303 and 2303B 0 000A Model 2303 PJ 5A range 0 000A 500mA range 0 0000A Long integration Integration time 1 second Pulse timeout 16 seconds Trigger edge Rising Trigger level Models 2303 and 2303B 0 000A Model 2303 PJ 5A range 0 000A 500mA range 0 0000A Setups Save Power on and Recall Setups are configured by SAVE SETUP POWER ON SETUP and RECALL SETUP items of the MENU which is accessed by pressing the MENU key NOTE Table 1 2 shows the menu structure Rules to navigate the menu follow the table The setup MENU items are explained as follows SAVE SETUP Save the present power supply setup to a memory location SAVO SAVA e RECALL SETUP Return the power supply to the RST defaults Table 1 1 or to one of the user saved setups SAVO SAV4 Note the operate state output is always recalled as OFF e POWER ON SETUP Select the setup to use at power up RST SAVO SAVA output off or SAV5 SAVO output on or off Note that SAV5 SAV9 are not available for the Model 2303 PJ When powering up to the SAVO SAV1 SAV2 SAV3 or SAVA setup the output will be off regardless of the operate state when the setup was saved For example if the output is on when the setup is saved as SAVO the power supply will power up with the output off for the SAVO power on setup
70. ct may be impaired The types of product users are Responsible body is the individual or group responsible for the use and maintenance of equipment for ensuring that the equip ment is operated within its specifications and operating limits and for ensuring that operators are adequately trained Operators use the product for its intended function They must be trained in electrical safety procedures and proper use of the instrument They must be protected from electric shock and contact with hazardous live circuits Maintenance personnel perform routine procedures on the product to keep it operating properly for example setting the line voltage or replacing consumable materials Maintenance procedures are described in the manual The procedures explicitly state if the operator may perform them Otherwise they should be performed only by service personnel Service personnel are trained to work on live circuits and perform safe installations and repairs of products Only properly trained service personnel may perform installation and service procedures Keithley products are designed for use with electrical signals that are rated Measurement Category I and Measurement Category II as described in the International Electrotechnical Commission IEC Standard IEC 60664 Most measurement control and data I O signals are Measurement Category I and must not be directly connected to mains voltage or to voltage sources with high transient over voltages
71. ct measurement mode HIGH LOW or HIGH AVERage TIME Set integration times AUTO Integration times set automatically HIGH lt NRf gt Specify integration time in sec for high pulse 3 333e 5 C measurements 33 33e 6 to 0 8333 LOW lt NRf gt Specify integration time in sec for low pulse 3 333e 5 C measurements 33 33e 6 to 0 8333 AVERage lt NRf gt Specify integration time in sec for average 3 333e 5 C pulse measurements 33 33e 6 to 0 8333 SYNChronize Pulse detection triggering STATe Send ON to select pulse current measurements ON D OFF selects pulse current digitization TLEVel lt NRf gt Models 2303 and 2303B Set trigger level in 0 0 E amps O to 5 TLEVel Model 2303 PJ trigger level E AMPs lt NRf gt Set trigger level in amps for 5A range 0 to 5 0 0 MILLiamp lt NRf gt Set trigger level in amps for 500mA range 0 0 0 to 0 5 DELay lt NRf gt Specify trigger delay in seconds 0 to 0 1 or0to5 0 0 F pulse current digitization READ Trigger and return one reading B READ ARRay Trigger an array of readings and return them B 3 8 Pulse Current Measurements A SENSe FUNCtion PCURrent The parameter name can instead be enclosed in single quotes as shown above B SENSe PCURrent AVERage lt NRf gt 1 When requesting a single reading FETch READ or MEASure average count specifies the number of pulse current measurement conversions to average for the re
72. current limit condition This bit clears when the output is turned back on Bit B6 power supply shutdown PSS This bit indicates that the output has turned off due to an overload and or overheat condition This typically indicates that the user tried to exceed the power output capability of the unit Figure 7 5 Operation event status CONDiition Operation Condition PSS re CLT B15 B7 B6 B5 B4 PSS CLT B15 B7 B6 B5 B4 Register EVENt Operation Event Register To OPC bit of Status Byte Register ENABle lt NRf gt ENABle Operation Event v PSS CLT B15 B7 B6 B5 B B2 B0 w aaa PSS Power Supply Shutdown amp Logical AND CLT Current Limit Tripped OR Logical OR CL Current Limit Enable Register Status Structure 7 13 Measurement event status The used bits of the measurement event register shown in Figure 7 6 are described as follows Bit B3 reading overflow ROF Set bit indicates that voltage or current reading exceeds the measurement range of the instrument Bit B4 pulse trigger timeout PTT Set bit indicates that a current pulse has not been detected Bit B5 reading available RAV Set bit indicates that a reading was taken and processed Bit B9 buffer full BF Set bit indicates that the specified number of readings average count have been taken Figure 7 6 Measurement event status
73. d and the relay output turns off ZERO when the unit is not in current limit With the TRIPRELAY mode Figure 2 4 the relay output turns on and the power sup ply output turns off when the current limit is tripped and the unit must be manually re set to turn the relay output off and the power supply output back on If the condition that caused the trip has not be corrected the output will trip again Note that you can also use the OUTPut RELay command to set the relay state see Sec tion 5 The parameter choices are ONE and ZERO With the current limit mode set to LIMit or TRIP the relay state operates independently based on the command parameter However with LIMRELAY or LIMITRELAY and TRIPRELAY the command pa rameters may be used to override the relay state and cause the relay state not to track the current limit state For LIMRELAY this condition may occur only momentary while the limiting condition still exists With TRIPRELAY this condition allows you to clear the relay tracking while correcting the tripping condition Once corrected and the output state is turned ON tracking will resume F CURRentSTATe 1 With the LIMit type selected this command returns a 1 if the power supply is oper ating as a constant current source current limit reached With the TRIP type selected a 1 is returned ifthe output has turned off tripped due to current limit being reached It will clear to 0 when the output is tur
74. default conditions see Default column of SCPI tables 2 Cancels all pending commands 3 Cancels response to any previously received OPC and OPC commands TRG trigger Send bus trigger to power supply Use the TRG command to trigger a single reading for the function presently selected If the average count is 71 then the single reading will be the average reading It has the same effect as a group execute trigger GET Common Commands 8 5 F TST self test query Run self test and read result Use this query command to perform a checksum test on ROM The command places the cod ed result 0 or 1 in the output queue When the power supply is addressed to talk the coded result is sent from the output queue to the computer A returned value of zero 0 indicates that the test passed and a value of one 1 indicates that the test failed G WAI wait to continue Wait until previous commands are completed Effectively the WAI command is a no op no operation for the power supply and therefore does not need to be used Two types of device commands exist Sequential commands A command whose operations are allowed to finish before the next command is executed Overlapped commands A command that allows the execution of subsequent com mands while device operations of the overlapped command are still in progress The WAI command is used to suspend the execution of subsequent commands until t
75. ds error queue oo eee eee esee Common Commands IEEE 488 2 common commands and queries esses 8 2 OPC and OPC commands eee 8 4 Signal Oriented Measurement Commands Signal oriented measurement command summary 9 2 10 DISPlay FORMat and SYSTem SCPI commands display eere SCPI commands data format eee SCPI commands system eese 11 SCPI Tables DISPlay command summary eee FORMat command summary eese OUTPut command summary 00 ee eee eeeeeeeseeeeeeseeeeeeseeeeaeeseeeaeed SENSe command summary sese SOURce command summary esee STATus command summary eee SYS Tem command summary eee C Emulation Commands HP commands used to control the power supply C 2 Fluke commands used to control Model 2303 2303B 2303 PJ C 5 Getting Started General information Covers general information that includes warranty informa tion contact information safety symbols and terms inspection and available options and accessories Power supply overview Summarizes the capabilities of the power supply Remote display option Explains how to use the optional Model 2304 DISP Display Module Power up Covers line power connection fuse
76. e For the 5A range the trigger level can be set from 0 to 5A in 5mA steps For the 5 00mA range the trigger level can be set from 0 to 500mA in 0 5mA steps However there is trigger hysteresis built into the hardware For the 5A range trigger hysteresis is ap proximately 10mA and for the 500mA range trigger hysteresis is approximately 1mA If a pulse does not exceed the appropriate hysteresis level trigger detection will not occur The two trigger level ranges for Model 2303 PJ are displayed as follows 5A Range PULSE TRIG LEVEL A 5 0 0 0004 500mA Range PULSE TRIG LEVEL mA 500 0 0000 A To toggle the range for the trigger level place the blinking cursor on the A at the far right end of the display and press the A or w key After keying in the trigger level in amps pressing ENTER updates the displayed range for that trigger level Pulse current display mode Pulse current measurements are displayed with the pulse current display mode selected This display mode is selected as follows NOTE _ If output settings are presently being displayed as denoted by a blinking digit in the voltage or current field keep pressing the set key until the blinking stops The instru ment can now display measured readings 3 6 Pulse Current Measurements 1 2 3 Press the DISPLAY key to access the display menu Press the A or v key until PULSE CURRENT is displayed and press ENTER Use the A or v key to display the desired
77. e separated by semicolons Here is an example showing two commands in one program message stat pres stat oper enab lt NRf gt When this command is sent the first command word is recognized as the root command stat When the next colon is detected the path pointer moves down to the next command level and executes the command When the path pointer sees the colon after the semicolon it resets back to the root level and starts over Commands that are on the same command level can be executed without having to retype the entire command path Example stat oper enab lt NRf gt enab After the first command enab is executed the path pointer is at the third command level in the structure Since enab is also on the third level it can be typed in without repeating the entire path name Notice that the leading colon for enab is not included in the program message If a colon were included the path pointer would reset to the root level and expect a root command Since enab is not a root command an error would occur GPIB Operation 6 11 Command path rules Each new program message must begin with the root command unless it is optional e g SOURce If the root is optional treat a command word on the next level as the root The colon at the beginning of a program message is optional and need not be used Example stat pres stat pres When the path pointer detects a colon it moves down to the
78. e current measurement process Measurement configuration Explains how to configure the instrument for pulse cur rent measurements Pulse current measurement procedure Provides the step by step procedure to per form pulse current measurements from the front panel SCPI programming Documents the commands used to program the instrument for pulse current measurements and covers pulse current digitization which can only be performed over the GPIB Two programming examples are provided one for pulse cur rent measurements and one for pulse current digitization 3 2 Pulse Current Measurements Overview The power supply can perform current measurements for pulsing loads The built in measure ments include Peak measured current measures the peak high current of the pulse train Idle measured current measures the idle low current of the pulse train e Average transmit current measures the average current of the pulse train NOTE For Models 2303 and 2303B pulse measurements are automatically performed on the 5A range For Model 2303 PJ pulse current measurements can be performed on either the 5A range or 500mA range The high low and average measurements of a pulse are illustrated in Figure 3 1 The high measurement is triggered on the rising edge of the pulse and an integration is performed for the time specified for the high measurement The falling edge of the pulse triggers the low measurem
79. ee Standard event status Operation event status nennen eneem nene Measurement event status Questionable event status 10 DISPlay FORMat and SYSTem IEEE 754 single precision data format esee 10 5 IEEE 754 double precision data format List of Tables 1 Getting Started Factory defaults RST MIU NNNM MENU StruCture T PEE 1 12 Basic Power Supply Operation Current TAN C E SCPI commands outputting voltage and current SCPI commands measure V and I and DVM input Sink current MitS eee ciere tette erbe iia Pulse Current Measurements SCPI commands pulse current measurements 3 7 Long Integration Measurements SCPI commands long integration measurements 4 9 Relay Control Switchcraft connection accessories eseeseeeeeeenree 5 4 SCPI command output relay control eese 5 5 GPIB Operation General bus commands eese 6 4 Status Structure Common and SCPI commands reset registers and clear queues 7 4 Command commands status byte and service request enable registers cee cee cio tenerte tret reni d iaiia Common and SCPI commands condition registers Common and SCPI commands event registers Common and SCPI commands event enable registers SCPI comman
80. eeenee Condition regIStets 4 nee tiene arae lette da peris ln Eicutio i Event enable registers eese Programming example program and read measurement event register oo eee eee eseeeeeteeeeeeeseeeaeeeeees QUEUES sis EE rupti Ioco go 8 Common Commands au P DN identification query esee OPC operation complete eeesseeeeeeeeeeenennnnenne OPC operation complete query see SAM NRI S8V6 p seh an peri iH HER EEUU ERE ES RCL NR f recall erecti RRS Teset eter ere P Ha RERO RR Ed ued uel PIJ M a r eid aa TST 7 self testquety s perse eret rtr tite eerie entere eee WAJ wait to continue eeeeseeeeeeeeee nee 9 Signal Oriented Measurement Commands e ON AT FETCH enasini SPEVT COtA RRA icre tenerte e tr tte eR eta ddp I READ ARRay7 iaeinidtetie eea EE R Eee tra ein P i ERE ERES MEASure function 1 eee E aR MEASure ARRay function eese 10 DISPlay FORMat and SYSTem DISPlay subsystem esee nennen eee enne DISPIay ENABle b 1 rette ree DISPlay TEXT DATA a eene eene DISPlay TEXT STATe b enne FORM at subsystem esses enne enne FORMat DATA type
81. egister 0 L 4 7 pem l Calibration Summary 1 Error Queue 2 oc az rt ale Always Zero CONDition EVENt ENABle lt NRf gt ENABle Output Queue Service Status Request Byte Enable Register Register Standard Event Registers MSB O9 MSB wet Event Event Enable EAV EAV 3 Register Register QSB QQ QSB Logical Operation Complete OPC L gt MAV MAV E OR on L ESB ESB Query Error QYE L 34 RQS MSS 6 K Device Specific Error e DDE L5 OSB I G OSB Execution Error EXE 9 STB SRE Command Error CME 3 SRE User Request URQ n Power On PON 5 Logical LLL Master Summary Status MSS 8 9 MSB Measurement Summary Bit me EAV Error Available _10 QSB Questionable Summary Bit Q 1 MAV Message Available 12 ESB Event Summary Bit G 13 L 3 RQS MSS Request for Service Master Summary Staus 14 OSB Operation Summary Bit Always Zero eis m Note RQS bit is in serial pol
82. egister ENABle lt NRf gt Program enable register see Parameters ENABle Read enable register MEASurement Measurement event enable register ENABle lt NRf gt Program enable register see Parameters ENABle Read enable register QUEStionable Questionable event enable register ENABle lt NRf gt Program enable register see Parameters ENABle Read enable register Parameters lt NRf gt 0 to 1023 Decimal format Note Power up and STATus PRESet resets all bits of all enable registers to 0 CLS has no effect Status Structure 7 17 Programming example program and read measurement event register The following command sequence enables the buffer full bit B9 of the measurement register set and then reads the event register After the programmed number of readings average count have been taken reading the event register will return a value of 512 STAT MEAS ENAB 512 Enable BF Buffer Full STAT MEAS Read Measurement Event Register Queues The power supply uses two queues which are first in first out FIFO registers Output queue Used to hold reading and response messages Error Queue Used to hold error and status messages The power supply status model Figure 7 1 shows how the two queues are structured with the other registers Output queue The output queue holds data that pertains to the normal operation of the instrument For example when a query command is se
83. egration period in usec for low pulse current measurements AVERAGE TIME Use to set the integration period in usec for average pulse current measurements AUTO TIME Use to automatically set the integration times for high low and average pulse current measurements These times are based on detecting the pulse and remain un til another auto time is performed or the times are manually changed Pulse Current Measurements 3 5 Average readings count Use the AVERAGE READINGS item of the PULSE CURRENT menu item to set the average readings count This count specifies the number of measurements integrations to average for each reading For example with reading count set to 10 each displayed reading will reflect the average of 10 pulse current measurements Trigger delay and trigger level Use the following items of the PULSE CURRENT menu item to set trigger delay and trigger level TRIGGER DELAY Use to specify additional trigger delay 0 to 100msec in 10usec steps See Trigger delay for details TRIGGER LEVEL Use to set the trigger level Pulses less than the specified level are not detected Models 2303 and 2303B Set the trigger level from 0 to 5A in 5mA steps However there is approximately 10mA of trigger hysteresis built into the hardware Therefore if a pulse does not exceed this level trigger detection will not occur Model 2303 PJ The trigger level can be set for either the 5A or 500mA rang
84. egration rate in line cycles for voltage cur 1 y rent and DVM measurements 0 01 to 10 NPLCycles Query integration rate AVERage lt NRf gt Specify the average count for voltage current and DVM 1 measurements 1 to 10 AVERage Query average count CURRent DC Path to configure the current measurement function y RANGe Current measurement range V UPPer lt n gt Measurement range specify expected current 5 0 V 0 to 5 amps UPPer Query current measurement range V AUTO lt b gt Enable or disable auto range OFF Y AUTO Query state of auto range PCURrent Path to configure the pulse current measurement function AVERage lt NRf gt Specify the average count for pulse current measurements 1 measurements to 100 or 1 to 5000 pulse current digitization AVERage Query average count MODE name Select pulse current measurement mode HIGH HIGH LOW or AVERage MODE Query pulse current measurement mode TIME Path to set pulse current integration times AUTO Power supply sets integration times HIGH lt NRf gt Specify integration time in sec for high pulse 3 333E 05 measurements 33 33E 06 to 0 8333 HIGH Query high integration time LOW lt NRf gt Specify integration time in sec for low pulse 3 333E 05 measurements 33 33E 06 to 0 8333 LOW Query low integration time AVERage lt NRf gt Specify integration time in sec for average pulse 3 333E 05 measurements 33 33E 06 to 0 8333
85. egration time that will encompass the high and low periods of the pulse This integration time applies for all subsequent long integration measure ments until another AUTO TIME is performed or the time is changed manually If you want the integration period to encompass two or more pulses you will have to set the integration time manually However you must make sure that the integration period does not extend into a pulse that you do not want measured For example if you want a long integration of two pulses you must make sure that the set integration time does not extend into the third pulse Trigger edge A pulse edge can be used to trigger the start of the measurement Either a RISING pulse edge or a FALLING pulse edge can start the measurement A third option is available if you do not want measurements controlled by pulse edges With NEITHER selected measurements start as soon as the long integration function is selected A pulse has to be detected before a RISING or FALLING pulse edge can trigger a long inte gration measurement All pulses that are less than the specified trigger level are ignored see Trigger level Pulse edges are ignored while a long integration is in process No pulse detec tion is needed if NEITHER trigger edge is selected Trigger level Before a rising or falling pulse edge can trigger the start of a long integration the pulse must first be detected Trigger level specifies the minimum pulse level that wil
86. ements controlled by pulse edges With NEITHER selected measurements will start as soon as the long integration function is selected Note that a pulse has to be detected before a rising or falling pulse edge can trigger a long integration measurement see Trigger Level Trigger level Before a rising or falling pulse edge can trigger the start of a long integration the pulse must first be detected Trigger level specifies the minimum pulse level that will cause detection Models 2303 and 2303B Set the trigger level from 0 to 5A in 5mA steps Models 2303 P J The trigger level can be set for either the 5A or 500mA range For the 5A range the trigger level can be set from 0 to 5A in 5mA steps For the 500mA range the trigger level can be set from 0 to 500mA in 0 5mA steps 4 6 Long Integration Measurements The two trigger level ranges for Model 2303 PJ are displayed as follows 5A Range PULSE TRIG LEVEL A 5 0 0 000A 500mA Range PULSE TRIG LEVEL mA 500 0 0000 A To toggle the range for the trigger level place the blinking cursor on the A at the far right end of the display and press the A and y key After keying in the trigger level in amps pressing ENTER updates the displayed range for that trigger level Long integration display mode Long integration measurements are displayed with the long integration display mode selected This display mode is selected as follows NOTE lfoutput settings are presentl
87. ent and an integration is performed for the time specified for the low measurement An average measurement is triggered on the rising edge and the integration is specified by the average measurement time setting NOTE Another measurement of pulse currents digitization is available over the bus Refer to Pulse current digitization in SCPI programming for details Figure 3 1 Pulse current measurement High l lt Low Average High and average measurement triggered on leading edge of pulse Y Low measurement triggered on falling edge of pulse Pulse Current Measurements 3 3 Trigger level To avoid false pulse detection you can use a trigger level of up to 5A All pulses noise or other transients that are less than the set trigger level will be ignored For Models 2303 and 2303B the maximum trigger level is 5A For Model 2303 PJ the trigger level can be set for each measurement range For the 5A range the maximum trigger level is 5A and for the 5 00mA range the maximum trigger level is 500mA Trigger delay When a pulse is detected there is a 25usec code execution delay before the integration period begins An additional trigger delay can be used to allow leading edge pulse overshoot to settle The integration period will not start until the trigger delay period expires Note that a large trig ger delay will slow down power supply operation Integration times The three integration time per
88. er of periods for a pulse train NOTE For Models 2303 and 2303B long integration current measurements are automatical ly performed on the 5A range For Model 2303 PJ pulse current measurements can be performed on either the 5A range or 500mA range Long integration measurement is accomplished by taking an integral number of integration cycles during the total measurement time An integration cycle is the line cycle period 16 67ms for 60Hz plus a small processing time The system calculates the number of integration cycles required based on the total time and rounds down to the nearest integer Therefore the actual measurement time can be slightly less than the requested measurement time by up to one line cycle time Long integration is a technique to extend the capabilities of the power supply A D circuit beyond its maximum integration time period The A D can measure pulses up to 833ms To extend this time period for longer pulses the long integration technique uses a filtered and sam pled measurement of the waveform This gives the power supply the ability to measure signals with periods up to 60 seconds The filtering of the waveform adds some restrictions to the types of pulses being measured If a pulse train has a high duty cycle where the off time is less than 200ms the first period of the measured waveform will not have settled to steady state therefore it will be an inaccurate measurement In all cases where the off or low time
89. er sets These optional characters do not have to be included in the program message Do not use brackets in the program message Angle brackets lt gt are used to indicate parameter type Do not use angle brackets in the program message The Boolean parameter lt b gt is used to enable or disable an instrument operation ON or 1 enables the operation and 0 or OFF disables it Upper case characters indicate the short form version for each command word Default parameter Listed parameters are the RST default Parameter notes are locat ed at the end of each table SCPI A checkmark v indicates that the command and its parameters are SCPI con firmed An unmarked command indicates that it is a SCPI command but does not con form to the SCPI standard set of commands It is not a recognized command by the SCPI consortium SCPI confirmed commands that use one or more non SCPI parameters are explained by notes SCPI Tables 11 3 Table 11 1 DISPlay command summary Default Command Description parameter SCPI DISPlay ENABle lt b gt Enable or disable front panel display Note 1 Y ENABle Query state of display Y WINDow 1 Path to locate message to display y TEXT Control user text message Note 2 y DATA lt a gt Define ASCII message a up to 32 characters V DATA Query text message V STATe lt b gt Enable or disable message mode Note 3 y STATe Query state of messa
90. er supply Note 3 Pulse current Pulse current configuration Sec 3 High time Set high time integration rate in usec Low time Set low time integration rate in psec Average time Set average time integration rate in pisec Auto time Set pulse integration rates automatically Average readings Set average reading count 1 to 100 Trigger delay Set trigger delay in seconds 0 to 100msec Trigger level Set trigger level Models 2303 and 2303B 0 to 5A Sec4 Long integration Integration time Auto time Pulse timeout Trigger edge Trigger level Model 2303 PJ 5A range 0 to 5A 500mA range 0 to 500mA Long integration configuration Manually set integration time up to 60 sec Automatically set integration time Set the NO PULSE timeout period 1 to 63 sec Select trigger edge rising falling or neither Set trigger level Models 2303 and 2303B 0 to 5A Model 2303 PJ 5A range 0 to 5A 500mA range 0 to 500mA Models 2303 and 2303B also have SAV5 SAV9 Notes 1 See Default settings in this section to save and recall setups 2 Revision Number displays the firmware revision level for the microcontroller and the display 3 Serial Number displays the serial number of the power supply Getting Started 1 13 Rules to navigate MENU The MENU is accessed by pressing the MENU key Use the A and v edit keys to display the primary menu items A displayed primary menu item is se
91. er synchronization is ON or OFF see Ref D EF SENSe PCURrentSYNChronize DELay lt NRf gt 1 The smallest step size for trigger delay is 10usec If you specify a smaller step size it is adjusted up to the next 10usec step value e g 43usec is adjusted up to 50usec 2 There is an internal trigger delay of 25usec after pulse detection for code execution to triggering the first reading Pulse Current Measurements 3 9 Pulse current digitization The following discussion explains how to digitize a current waveform A programming example at the end of this section demonstrates proper command sequence for pulse current digitization With pulse current digitization selected readings are taken at a constant integration time of 33ysec across the pulse or pulse train The message DIGITIZE is displayed instead of read ings Pulse current digitization is selected by disabling trigger synchronization SENS PCUR SYNC lt b gt lt b gt OFF Select pulse current digitization trigger synchronization disabled ON Select pulse current measurements trigger synchronization enabled The commands to set the trigger level and trigger delay for pulse current measurements also apply for pulse current digitization However the trigger delay can be set up to five seconds SENS PCUR SYNC DEL lt NRf gt lt NRf gt 0to5 Trigger digitization delay in seconds 10psec steps Note that the NO PULSE message will be displayed if the p
92. er to the operating instructions located in the manual The A symbol on an instrument shows that it can source or measure 1000 volts or more including the combined effect of normal and common mode voltages Use standard safety pre cautions to avoid personal contact with these voltages The A symbol indicates a connection terminal to the equipment frame The WARNING heading used in a manual explains dangers that might result in personal injury or death Always read the associated information very carefully before performing the indicated procedure The CAUTION heading used in a manual explains hazards that could damage the instru ment Such damage may invalidate the warranty Specifications Full power supply specifications can be found in Appendix A of this manual Getting Started 1 3 Inspection The power supply was carefully inspected electrically and mechanically before shipment After unpacking all items from the shipping carton check for any obvious signs of physical damage that may have occurred during transit Note There may be a protective film over the display lens which can be removed Report any damage to the shipping agent immediately Save the original packing carton for possible future shipment The following items are included with every order e Model 2303 2303B 2303 PJ High Speed Power Supply with line cord Quick Disconnect Output DVM Input Connector e Accessories as ordered e Certificate of calibratio
93. est for data is received This delay may cause unexpected time outs when using SRQ on MAV for que ries that take a long time to execute General operation notes The remote blinking R on the front panel still operates since it is critical to fundamental GPIB operation Ifthe unit is in REMote the GTL command may not put the power supply into the local mode Only the front panel LOCAL key is guaranteed to operate if not in local lockout LLO GTL will still disable LLO EEE 488 bus commands and features GET IFC SDC DCL LLO Serial Poll and SRQ are still fully supported Multiple TALKs on the same query are supported as in the SCPI protocol This feature is useful when reading back long ASCII strings KEITHLEY Service Form Model No Serial No Date Name and Telephone No Company List all control settings describe problem and check boxes that apply to problem Q Intermittent Q Analog output follows display C Particular range or function bad specify C IEEE failure CJ Obvious problem on power up CJ Batteries and fuses are OK C Front panel operational U All ranges or functions are bad C Checked all cables Display or output check one C Drifts C Unable to zero C Unstable C Overload C Will not read applied input C Calibration only CJ Certificate of calibration required C Data required attach any additional sheets as necessary Show a block diagram of your measurement including
94. ew Revision includes a revised copy of this print history page Revision A Document Number 2303 900 01 essere Revision B Document Number 2303 900 01 sss Revision C Document Number 2303 900 01 sees Revision D Document Number 2303 900 01 essere Addendum D Document Number 2303 900 02 sess Revision E Document Number 2303 900 01 cecessseseeseescsseceeeeseeseeeceeeaeeseeesaeeaeees Revision F Document Number 2303 900 01 esee All Keithley product names are trademarks or registered trademarks of Keithley Instruments Inc Other brand names are trademarks or registered trademarks of their respective holders February 1998 November 1999 NSA Safety Precautions The following safety precautions should be observed before using this product and any associated instrumentation Although some instruments and accessories would normally be used with non hazardous voltages there are situations where hazardous conditions may be present This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury Read and follow all installation operation and maintenance information carefully before us ing the product Refer to the manual for complete product specifications If the product is used in a manner not specified the protection provided by the produ
95. f a pulse was present when the measurement was made NOTE For GPIB operation there is a fast readings mode that can be used with long integra tion functionality see the FAST command in Table 4 1 Measurement configuration NOTE Current range is selected from the CURRENT RANGE item of the menu Integration time trigger edge trigger level and pulse timeout are set from the LONG INTEGRA TION item of the menu Details on integration time trigger edge trigger level and pulse timeout are provided in the Overview Table 1 2 in Section 1 shows the menu structure Rules to navigate the menu follow the table Current range For long integration measurements the AUTO range selection is functionally a no op no oper ation The instrument will not autorange with the long integration measurement function selected For Models 2303 and 2303B long integration measurements are performed on the 5A range regardless of the range selection For Model 2303 PJ long integration measurements are performed on which ever range the instrument is on when the long integration measurement function is selected Current range is linked to current limit Therefore as a general rule the user selects the cur rent range before setting the current limit See Outputting voltage and current in Section 2 for details on current range and current limit Current range is selected from CURRENT RANGE item of the menu Long Integration Measurements 4 5
96. ge SA or 500mA that is being used for long integration measurements step 1 of the pulse current measure ment procedure After selecting the appropriate voltage and current values turn on the output Select the long integration display type If the trigger level is too low or too high the NO PULSE message will be displayed If long integration measurements are instead being displayed the trigger level is valid You can skip the rest of this procedure Go into the menu select LONG INTEGRATION and then TRIGGER LEVEL Adjust the trigger level and press ENTER The unit starts looking for the pulse If the trigger level is still too low or too high the LONG INT TRIG NOT DETECTED mes sage will be displayed briefly Note that it may take as long as the timeout value for the message to appear If the message appeared repeat step 5 until a valid trigger level is found Use the MENU key to back out of the menu structure and display long integration cur rent measurements 4 8 Long Integration Measurements SCPI programming Table 4 1 SCPI commands long integration measurements Commands Description Default Ref SENSe SENSe subystem FUNCtion LINTegration Select long integration measurement function VOLT A LINTegration Long integration configuration TIME lt NRf gt Set integration time in sec X to 60 where X is 1 B 0 850 for 60Hz or 0 840 for 50Hz AUTO Integration time set automatically T
97. ge mode V Notes 1 RST has no effect on display circuitry Cycling power enables ON the display circuit 2 RST has no effect on a user defined message Cycling power cancels all user defined messages 3 RST has no effect on the state of the message mode Cycling power disables OFF the message mode Table 11 2 FORMat command summary Default Command Description parameter SCPI FORMat see Note DATA type Specify data format ASCii SREal or DREal ASCii y DATA Query data format y BORDer lt name gt Specify byte order NORMal or SWAPped SWAPped V BORDer Query byte order V Note The FORMat commands are only valid if the exponential GPIB output format is selected The output format is selected from the OUTPUT FORMAT item of the menu see Section 6 for details Table 11 3 OUTPut command summary Default Command Description parameter SCPI OUTPut J STATe lt b gt Turn output on or off OFF y STATe Query state of output y RELay lt name gt Close ONE or open ZERO control circuit for an ZERO external relay RELay Query state of the relay circuit 11 4 SCPI Tables Table 11 4 SENSe command summary Default Command Description parameter d SENSe 1 FUNCtion lt name gt Select measurement function VOLTage CURRent VOLT PCURrent LINTegration or DVMeter FUNCtion Query measurement function NPLCycles n Specify int
98. ger level for 500mA range 0 to 0 5 amps 0 MILLiamp Query trigger level for 500mA range TEDGe name Select trigger edge to initiate the measurement RISING FALLING or NEITHER RISING TEDGe Query trigger edge TimeOUT lt NRf gt Specify length of timeout 1 to 63 seconds 16 TimeOUT Query timeout SEARch lt b gt Enable or disable pulse search ON SEARch Query state of pulse search FAST lt b gt Enable or disable long integration fast readings mode OFF FAST Query long integration fast readings mode 11 6 SCPI Tables Table 11 5 SOURce command summary Default Command Description parameter SCPI SOURce VOL Tage Path to set output voltage V LEVel Y IMMediate AMPLitude lt n gt Specify voltage amplitude in volts 0 to 15 1mV resolution 0 0 Y AMPLitude Query voltage amplitude Y CURRent Path to configure current Y LIMit Path to configure current limit VALue lt NRf gt Specify current limit value in amps 0 to 5 100uA resolution 0 25 VALue Query current limit value TYPE lt name gt Select current limit type LIMit TRIP LIM LIMRELAY LIMITRELAY or TRIPRELAY TYPE Query current limit type SSTATe Query state of current limit 1 in current limit for LIMit type or output tripped for TRIP type 0 not in LIMit TRIP LIMRELAY LIMIT RELAY and TRIPRELAY are available in Models 2303 2303B with firmware revision A06 and higher SCPI
99. he de vice operations of all previous overlapped commands are finished The WAI command is not needed for sequential commands 8 6 Common Commands 9 Signal Oriented Measurement Commands 9 2 Signal Oriented Measurement Commands Overview The signal oriented measurement commands are used to acquire readings You can use these high level instructions to control the measurement process These commands are summarized in Table 9 1 Table 9 1 Signal oriented measurement command summary Command Description FETCh Returns the last reading FETCh ARRay Returns the last array of readings READ Triggers a new reading and returns it READ ARRay Triggers a new array of readings and returns them MEASure function Performs a READ on the specified function MEASure ARRay lt function gt Performs a READ ARRay on the specified function NOTE For all array queries make sure the computer s buffer is large enough to accomodate all array readings For all non array queries the overflow readings are as follows exponential format 9 9E37 2 decimal places format 99 99 3 decimal places format 99 999 4 decimal places format 99 9999 For all array queries overflow readings are in the exponential format only ETCh Return last reading FETCh ARRay Return last array of readings The FETCh command is used to return the last averaged reading and the FETCh ARRay command is used to return the last arr
100. hen select ADDRESS After setting the address value make sure you press ENTER to select it NOTE The present address is displayed on power up on the top line of the display Output format Readings over the bus can be returned in the exponential or decimal format For the exponen tial format a 10V reading would be returned as 1 00000000E 01 For a decimal format it would be returned as 10 00 2 decimal places 10 000 3 decimal places or 10 0000 4 decimal places The output type KEITHLEY or FLUKE can be set for the response to the IDN query command IDN provides identification information See Section 8 for details on the responses for IDN The output format and type is selected from the menu which is accessed by pressing the MENU key NOTE Table 1 2 in Section 1 shows the menu structure Rules to navigate the menu follow the table Once in the menu select GPIB MENU and then select OUTPUT FORMAT Both format and type is selected from this secondary menu item Format Using the A and V keys display the desired output format EXPONENTIAL 2 DECIMAL PLACES 3 DECIMAL PLACES or 4 DECIMAL PLACES and press ENTER Type To select the format type for IDN use the lt or key to display KEITHLEY or FLUKE and press ENTER NOTE Output format and type are retained through a power cycle and are not affected by RST or RCL 6 4 GPIB Operation General bus commands General bus commands are those command
101. ic query commands are covered later in this section see Tables 7 2 through 7 5 The response message to the query command is a decimal value To determine which bits in the register are set convert that decimal value to its binary equivalent For example the binary equivalent of decimal 41 is 101001 This binary value indicates that bits B5 B3 and BO are set 7 6 Status Structure Status byte and service request SRQ Service request is controlled by two 8 bit registers the status byte register and the service request enable register Figure 7 3 shows the structure of these registers Figure 7 3 Status byte and service request Status Summary Messages 6 Y Y Y Service RQS Request STB OSB B6 ESB MAV QSB EAV MSB Generation Serial Poll B7 MSS B5 B4 B3 B2 B1 BO amp OR amp SRE OSB ESB MAV QSB EAV MSB SRE B7 B6 B5 B4 B3 B2 81 BO Decimal 128 32 16 8 4 1 Weights 27 25 24 23 23 2 OSB Operation Summary Bit MSS Master Summary Status RQS Request for Service ESB Even amp Logical AND OR Logical OR Summary Bit MAV Message Available QSB Questionable Summary Bit EAV Error Available MSB Measurement Summary Bit Status Byte Register
102. idually addressed the SDC com mand provides a method to clear only selected instruments instead of clearing all instruments simultaneously as is the case with DCL GET group execute trigger GET is a GPIB trigger that is used as an event to control operation The power supply reacts to this trigger if it is the programmed control source The control source is programmed from the SCPI TRIGger subsystem SPE SPD serial polling Use the serial polling sequence to obtain the power supply serial poll byte The serial poll byte contains important information about internal functions Generally the serial polling sequence is used by the controller to determine which of several instruments has requested service with the SRQ line However the serial polling sequence may be performed at any time to obtain the status byte from the power supply 6 6 GPIB Operation Front panel aspects of GPIB operation The following paragraphs describe aspects of the front panel and remote panel that are part of GPIB operation including the remote operation indicator LOCAL key and messages Remote indicator and LOCAL key When the power supply is in the remote state the R character is displayed in the bottom right corner of the display It blinks as a solid block character R does not necessarily indicate the state of the REM line as the instrument must be addressed to listen with REM true before the R indicator turns on When the inst
103. ies the lowest allowable value SENSe CURRent RANGe MAXimum Queries the largest allowable value GPIB Operation 6 9 Case sensitivity Common commands and SCPI commands are not case sensitive You can use upper or lower case and any case combination Examples RST rst DATA data STATus PRESet status preset Long form and short form versions A SCPI command word can be sent in its long form or short form version The command subsystem tables in Section 4 provide the long form version However the short form version is indicated by upper case characters Examples STATus PRESet long form STAT PRES short form STATus PRES long form and short form combination Note that each command word must be in either long form or short form For example STATu PRESe is illegal and will generate an error The command will not be executed Short form rules Use the following rules to determine the short form version of any SCPI command or parameter If the length of the word is four letters or less no short form version exists Example auto auto These rules apply to words that exceed four letters If the fourth letter of the word is a vowel delete it and all the letters after it Example dvmeter dvm If the fourth letter of the command word is a consonant retain it but drop all the letters after it Example format form Ifthe command contains a question mark query or a non optional nu
104. igitization The following command sequence returns 3600 digitized readings It will take approximately one second to perform the measurement process SENS RANG 5 Select 5A range VOLT 15 Set output voltage to 15V CURR 0 75 Set current limit to 750mA OUTP ON Turn output on SENS PCUR SYNC OFF Disable trigger synchronization SENS PCUR AVER 3600 Set average count to 3600 SENS PCUR SYNC TLEV 0 1 Set trigger level to 100mA SENS PCUR SYNC DEL 50e 3 Set trigger delay to 50msec SENS FUNC PCUR Select pulse current function READ ARR Trigger and return 3600 readings Long Integration Measurements Overview Provides an overview of the long integration measurement process Measurement configuration Explains how to configure the instrument for long inte gration measurements Longintegration measurement procedure Provides the step by step procedure to perform long integration measurements from the front panel e SCPI programming Documents the commands used to program the instrument for long integration measurements Included is a programming example to perform long in tegration measurements 4 2 Long Integration Measurements Overview Long integration is an average measurement of one or more pulses The integration time period can be as long as 60 seconds Since long integration is an average measurement the inte gration time period should be a complete period or integral numb
105. inator has been sent usually Line Feed with EOI Otherwise a DCL or IFC must be sent to reset the input parser When receiving data all data up to and including the terminator LF with EOD must be accepted Otherwise a DCL or IFC must be sent to reset the output task Empty command strings terminator only should not be sent Using SCPI based programs In general an existing SCPI based program will run properly and faster in the 488 1 proto col as long as it meets the previous guidelines and limitations Bus hold off OPC OPC and WAI are still functional but are not needed for the 488 1 protocol When sending commands the GPIB is automatically held off when it detects a terminator The hold off is released when all the commands have finished executing or if there is some parser or command error Trigger on talk Trigger on talk functionality has been added for the 488 1 protocol If a query has not been received by the instrument the power supply will automatically assume a READ command has been sent when it is addressed to talk This technique increases GPIB speed by decreasing the transmission and parser times for the command Message available The MAV message available bit in the Serial Poll byte will be set when the query is fin ished being processed not when there is data available in the output buffer as with the SCPI protocol For the 488 1 protocol output data will not be formatted until the first requ
106. ing a user trigger reading command With this setting only a user trigger reading com mand causes the unit to look for a pulse Therefore no information on pulse detection is available until a user triggered command is received E READ After sending a trigger reading command to perform long integration measurements do not address the power supply to talk until all readings are completed Details on READ and the other signal oriented measurement commands are provided in Section 9 Programming example The following command sequence will trigger and return one long integration measurement SENS VOLT CURR OUTP SENS SENS SENS SENS READ RANG 15 0 75 ON LINT LINT LINT FUNC 5 TIME AUTO TLEV 0 1 TEDge RISING LINT Select 5A range Set output voltage to 15V Set current limit to 750mA Turn output on Set integration time automatically for single pulse Set trigger level to 100mA Select rising trigger edge to initiate measurement Select long integration function Trigger and return one reading 4 10 Long Integration Measurements Relay Control Overview Summarizes how the power supply can be used to control an external relay Connections Explains how to connect an external relay circuit to the power supply Controlling the relay Explains how to control the external relay circuit 5 2 Relay Control Overview The power supply can be used to c
107. ing the remote display and waiting a few seconds to reconnect it may clear the problem If not cycling power on the power supply clears the condition Power up Line power connection The power supply operates from a line voltage in the range of 100 to 240V at a frequency of 50 or 60Hz Line voltage and frequency are automatically sensed therefore there are no switches to set Check to see that the line power in your area is compatible Use the SYSTem LFRequency query Section 10 to read the line frequency Perform the following steps to connect the power supply to the line power and turn it on 1 Before plugging in the power cord make sure the front panel power switch is in the off 0 position 2 Connect the female end of the supplied power cord to the AC receptacle on the rear panel Getting Started 1 7 WARNING _ The power cord supplied with the power supply contains a separate ground 3 for use with grounded outlets When proper connections are made instru ment chassis is connected to power line ground through the ground wire in the power cord Failure to use a grounded outlet may result in personal in jury or death due to electric shock Turn on the power supply by pressing the front panel power switch to the on 1 position Fuse replacement A rear panel fuse protects the power line input of the power supply If the line fuse needs to be replaced perform the following steps 1 The fuse is located in
108. iods for pulse measurements can be set automatically or man ually by the user When the pulse auto time operation is performed the instrument measures the high and low periods of the detected pulse and sets appropriate integration times The pulse average time is set to the sum of the measured high and low times The three integration times apply for all subsequent pulse measurements until another pulse auto time is performed or the times are changed manually The pulse auto time feature can detect pulses in the 80usec to 833msec range You can manually set the PULSE HIGH TIME PULSE LOW TIME and PULSE AVG TIME In general the longer the integration period the more accurate the measurement How ever you must make sure an integration period does not extend into the wrong portion of the pulse or into the next pulse For example if the pulse is high for 600usec the high integration time must be x600usec If not you will integrate a low portion of the pulse and the high pulse measurement will therefore be erroneous Be sure to factor in trigger delay when determining integration times Average readings count The average readings count specifies how many measurements integrations are performed and averaged for each displayed reading For example assume that the pulse average readings count is 10 and you are measuring PULSE HIGH Each displayed reading will reflect the aver age of 10 peak pulse measurements 3 4 Pulse Current Measurements
109. is less than 200ms the filtered pulse will have reached steady state in the second cycle of the waveform and therefore can be accurately measured In other words to measure a periodic waveform with low times less than 200ms high duty cycle start measurements after the first period occurs This is not a problem for one shot pulses or for pulses with off times greater than 200ms The long integration measurement can be triggered to start on the rising or falling edge of a detected pulse A third option neither edge lets you start the long integration measurement as soon as the long integration function is selected assuming the output is on This option does not need a valid trigger level to generate a reading It will perform a measurement and produce a reading of the current even if a pulse is not present Therefore with NEITHER selected the NO PULSE message will not appear on the display Long Integration Measurements 4 3 Integration time The integration time period can be set automatically or manually by the user The integration time can be as long as 60 seconds For 60Hz power line frequency the minimum integration time setting is 850msec For 50Hz power line frequency the minimum integration setting is 840msec Use AUTO TIME when you want to perform a long integration measurement of each pulse When the AUTO TIME operation is performed the instrument measures the time between two rising pulse edges and sets an appropriate int
110. l byte ESR ESE lt NRf gt MSS bit is in STB response ESE Measurement Event Registers Operation Event Registers Event Event Condition Event Enable Condition Event Enable Register Register Register Register Register Register 0 0 0 J 1 1 1 2 2 2 H Reading Overflow ROF ROF 9 1 ROF Current Limit Pulse Trigger Timeout PTT 34 PTT PIT 7 Current Limit Tripped Reading Available RAV RAV RAV gt 6 6 6 FY Logical Power Supply Shutdown 7 7 9 7 OR 3 oH Buffer Full BF BF BF 10 10 9 10 H H Q n 12 12 12 3 13 13 13 3 14 14 ou M Always Zero 15 15 15 A Always Zero CONDition LEVENE ENABle lt NRf gt CONDition LEVEN ENABIle lt NRf gt ENABle ENABle 7 4 Status Structure Clearing registers and queues When the power supply is turned on the bits of all registers in the status structure are clear reset to 0 and the two queues are empty Commands to reset the event and event enable registers and the error queue are listed in Table 7 1 In addition to these commands any enable register can be reset by sending the 0 parameter value with the individual command to program the register NOTE RST has no effect on status structure registers and queues See Queues for details on the error queue Table 7 1 Common and SCPI commands reset registers and clear queues Commands Description Ref To reset registers Reset all bits of
111. l cause detection For example if the trigger level is set for 2A pulses that are 22A will be detected Current pulses 2A are ignored For Models 2303 and 2303B the maximum trigger level is 5A For Model 2303 PJ the trig ger level can be set for each measurement range For the 5A range the maximum trigger level is 5A and for the 500mA range the maximum trigger level is 500mA 4 4 Long Integration Measurements Pulse timeout PULSE TIMEOUT applies only to long integration measurements that are configured to be triggered by rising or falling pulse edges After the long integration function is selected the instrument searches for a pulse If a pulse is not detected within the specified time pulse time out the NO PULSE message will be displayed While the NO PULSE message is dis played the instrument continues to search for a pulse With a long timeout setting the instrument may appear locked up while it is searching for the pulse to start the long integration PULSE TIMEOUT can be set from 1 000 to 63 000 seconds NOTE For GPIB operation the search after the timeout can be disabled see the SEARch command in Table 4 1 With neither trigger edge selected pulse timeout is not used and a pulse search is not con ducted Therefore the NO PULSE message is never displayed Measurements start as soon as the long integration function is selected even if no pulse is present It is the responsibility of the user to determine i
112. lacement components in mains circuits including the power transformer test leads and input jacks must be purchased from Keithley Instruments Standard fuses with applicable national safety ap provals may be used if the rating and type are the same Other components that are not safety related may be purchased from other suppliers as long as they are equivalent to the original component Note that selected parts should be purchased only through Keithley Instruments to maintain accuracy and functionality of the product If you are unsure about the applicability of a replacement component call a Keithley Instruments office for information To clean an instrument use a damp cloth or mild water based cleaner Clean the exterior of the instrument only Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument Products that consist of a circuit board with no case or chassis e g data acquisition board for installation into a computer should never require cleaning if handled accord ing to instructions If the board becomes contaminated and operation is affected the board should be returned to the factory for proper cleaning servicing Table of Contents 1 Getting Started General information essere eene Warranty information esses enne nnne nnne Contact information sss isnie ores sue oa R Eais Safety symbols and terms esee Specifications esien eiee an
113. lected by pressing ENTER With PULSE CUR RENT or LONG INTEGRATION selected use the A and w edit keys to display the sec ondary items and press ENTER to select the displayed item Settings and selections for a menu item are displayed using the edit keys lt gt A and v For a setting use or p to place the cursor on the appropriate digit and use A and v to increment and decrement the value unless noted otherwise For a selection use A or v to display the desired option unless noted otherwise e With the desired setting or selection displayed press ENTER for it to take effect Press ing MENU will cancel the edit operation Use the MENU key to back out of the MENU structure SCPI programming SCPI programming information is integrated with front panel operation throughout this man ual SCPI commands are listed in tables and additional information that pertains exclusively to remote operation is provided after each table Also the SCPI tables may reference other sections of this manual NOTE Except for Section 11 all SCPI tables in this manual are abridged That is they ex clude most optional command words and query commands Optional command words and query commands are summarized as follows Optional Command Words In order to be in conformance with the IEEE 488 2 standard the power supply accepts optional command words Any command word that is enclosed in brackets is optional and does not have to be i
114. les 7 2 and 7 5 A command to program an event enable register is sent with a decimal parameter value that determines the desired state 0 or 1 of each bit in the appropriate register The bit positions of the register see Figure 7 2 indicate the parameter value in binary format For example if you wish to sets bits B4 B3 and B1 the binary value would be 11010 where B4 1 B3 1 B2 0 B1 1 BO 0 and all other bits are 0 The decimal equivalent of binary 11010 is 26 Therefore the parameter value for the enable command is 26 Another way to determine the decimal value is to add up the decimal weights for the bits that you wish to set Note that Figure 7 2 includes the decimal weight for each register bit To set bits B4 B3 and B1 the parameter value would be the sum of the decimal weights for those bits 164 842 26 Figure 7 2 16 bit status register A Bits 0 through 7 Bit Position B7 B6 B5 B4 B3 B2 B1 BO Binary Value 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 128 64 32 16 8 4 2 1 D Weight eema eee Coy Je Tote Ia lob ID s fuos B Bits 6 through 15 Bit Position B15 B14 B13 B12 B11 B10 B9 B8 Binary Value 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 32768 16384 8192 4096 2048 1024 512 256 Q mg eB Ie ue qq oy 12 Decimal Weights Reading registers Any register in the status structure can be read by using the appropriate query command The specif
115. lowing command strings are valid SYST MEP ON SENS NPLC 1 5 SYST MEP OFF The following command strings are invalid SYST MEP ON SENS NPLC SYST MEP OFF VOLT 2 5 Changing the GPIB mode over the bus will clear the blinking R that indicates remote mode operation Protocol differences The following information covers the differences between the 488 1 protocol and the SCPI protocol Message exchange protocol MEP When the 488 1 protocol is selected the MEP is disabled to speed up GPIB operation The following guidelines limitations must be followed when using the 488 1 protocol Ifa query is sent it must be the only command on the line or the last of a multiple command line this limitation also means no multiple queries can be sent Otherwise full SCPI command syntax is still supported including long form and short form com mands multiple commands and MIN MAX DEF parameter definitions For example the following command strings are invalid SOUR VOLT OPC SENS CURR RANG READ READ READ The following command strings are valid SOUR VOLT 4 OPC SENS NPLC 1 0 SENS CURR RANG MIN SSENS CURR RANG MAX READ D 4 Models 2303 and 2303B GPIB 488 1 Protocol When a query is sent either the data must be read back or a Device Clear DCL or Interface Clear IFC must be performed to reset the query When sending a command or query do not attempt to read data from the power supply until the term
116. mber included in the command word you must include it in the short form version Example function func Command words or characters that are enclosed in brackets are optional and need not be included in the program message 6 10 GPIB Operation Program messages A program message is made up of one or more command words sent by the computer to the instrument Each common command is a three letter acronym preceded by an asterisk SCPI commands are categorized in the S TATus subsystem and are used to help explain how command words are structured to formulate program messages STATus Path Root OPERation Path ENABle lt NRf gt Command and parameter ENABle Query command PRESet Command Single command messages The previous command structure has three levels The first level is made up of the root command STATus and serves as a path The second level is made up of another path OPERation and a command PRESet The third path is made up of one command for the OPERation path The three commands in this structure can be executed by sending three separate program messages as follows stat oper enab lt NRf gt stat oper enab stat pres In each of the above program messages the path pointer starts at the root command stat and moves down the command levels until the command is executed Multiple command messages You can send multiple command messages in the same program message as long as they ar
117. mode With the limit relay mode Figure 2 3 the relay output turns on ONE when the current limit is reached and the relay output turns off ZERO when the unit is not in current limit TRIP RELAY mode With the trip relay mode Figure 2 4 the relay output turns on and the power supply output turns off when the current limit is tripped and the unit must be manu ally reset to turn the relay output off and the power supply output back on If the condition that caused the trip has not be corrected the output will trip again As discussed in Section 5 you can also use the OUTPUT RELAY submenu to set the relay state to ONE relay closed and ZERO relay open With current limit mode set to LIMIT or TRIP the relay state operates independently based on the menu choice selected However with LIMIT RELAY and TRIP RELAY the menu choices may be used to override the relay state and cause the relay state not to track the current limit state For LIMIT RELAY this condition may exist only momentary while the limiting condition still exists TRIP RELAY allows you to clear the relay tracking while correcting the tripping condition Once corrected and the output state is turned on tracking will resume 2 6 Basic Power Supply O peration When the current limit relay control mode is selected the relay may chatter or not NOTE have sufficient time to pull in if the current value is fluctuating around the set cur rent limit depending on how rapidl
118. n e Model 2303 2303B 2303 PJ User s Manual P N 2303 900 00 e Model 2303 2303B 2303 PJ Service Manual P N 2303 902 00 If an additional manual is required order the appropriate manual package The manual pack age includes a manual and any pertinent addenda Any improvements or changes concerning the instrument or manual will be explained in an addendum included with the manual Be sure to note these changes and incorporate them into the manual Options and accessories The following options and accessories are available for the power supply e 2304 DISP remote display unit e Shielded IEEE 488 cable 1m 3 3 ft P N 7007 1 e Shielded IEEE 488 cable 2m 6 6 ft P N 7007 2 Single fixed rack mount kit P N 4288 1 Dual fixed rack mount kit P N 4288 2 JEEE 488 Interface controller for the PCI bus P N KPCI 488 EEE 488 interface card for IBM PC AT full slot P N KPC 488 2AT 1 4 Getting Started Power supply overview The power supply shown in Figure 1 1 can output up to 15V at up to 3A or 9V at up to 5A Voltage can be set in 1mV steps and current limit can be set in 100nA steps Maximum power output is 45W The power supply can also be used to sink current up to 2A As a sink current polarity is negative the power supply is dissipating power rather than sourcing it see Sink operation for details NOTE Model 2303B has a blank front panel except for a POWER switch and an ON OFF LED All refere
119. nces to front panel messages menus and keystrokes apply to the Models 2303 and 2303 PJ and the 2303B if using the Model 2304 DISP remote display module Figure 1 1 High speed power supply Model 2303 shown Kekili 2303 HIGH SPEED POWER SUPPLY 15V 3A 9V 5A 4 A Front Panel LINE FUSE ISOLATION FROM EARTH SLOWBLOW 22 VOLTS MAX 2 0A 250V LINE RATING 100 120VAC 200 240VAC 50 60 HZ sbunde dense source ovu n MALA RELAY OUTPUT CONTROL 18V 3A SV 5A 15VDC MAX AN SI REMOTE DISPLAY OPTION MAS WD IEEE 488 CHANGE IEEE ADDRESS WITH N FRONT PANEL MENU karny mn e Quis B Rear Panel Getting Started 1 5 A simplified diagram of the power supply is shown in Figure 1 2 Note that it can read back the output voltage V meter and current 15 4 Display resolution for voltage readback is 1mV Current Readback Ranges e Models 2303 and 2303B Two ranges for current readback 5A and 5mA On the 5A range display resolution is 1001LA and on the 5mA range resolution is 0 1uA e Model 2303 PJ Two ranges for current readback 5A and 500mA On the 5A range display resolution is 1001LA and on the 500mA range resolution is 0 01mA 104A The power supply also has a digital voltmeter DVM that is independent of the power supply circuit The DVM can measure up to 20V 1mV resolution When used with a pulsed load the power supply can read ba
120. ncluded in the program message Query commands Most command words have a query form A query command is iden tified by the question mark that follows the command word A query command requests que ries the programmed status of that command When a query is sent and the power supply is addressed to talk the response message is sent to the computer NOTE For complete details see Programming syntax in Section 6 1 14 Getting Started Basic Power Supply Operation Test connections Explains how to connect the device under test DUT to the power supply output and how to connect an external voltage to the DVM input Outputting voltage and current Explains how to output voltage and current Reading back V and I Covers the Actual V and I display mode which is used to measure and display the actual voltage and current being delivered to the DUT Independent voltage measurements DVM Input Explains how to use the digital voltmeter DVM to make DC voltage measurements Sink operation Explains how to use the power supply to dissipate power rather than sourcing it Programming examples Provides two examples one to output and read back voltage and current and one to measure the DVM input 2 2 Basic Power Supply O peration Test connections WARNING When installing a unit into a test system make sure the external power sources do not apply voltage to the power supply in excess of its
121. nd error EE 000 No error SE 101 Operation complete SE 301 Reading overflow SE 302 Pulse trigger detection timeout SE 306 Reading available SE 310 Buffer full SE EE error event SE status event SYS system error event B 3 B 4 Error and Status Messages Number Description Event 320 Current limit event SE 321 Current limit tripped event SE 323 Power supply shutdown event SE Calibration messages 404 Volt full scale cal prepare error EE 405 Volt full scale cal output error EE 406 Volt full scale cal meas error EE 407 DVM full scale cal meas error EE 409 5 Amp source cal prepare error EE 410 5 Amp source cal output error EE 411 5 Amp source cal measure error EE 412 Models 2303 and 2303B 5mA source cal EE prepare error Model 2303 PJ 5mA source cal prepare EE error 413 Models 2303 and 2303B 5mA source cal EE measure error Model 2303 PJ 500mA source cal mea EE sure error 438 Date of calibration not set EE 440 Gain aperture correction error EE 500 Calibration data invalid EE 510 Reading buffer data lost EE 511 GPIB address lost EE 512 Power on state lost EE 514 DC Calibration data lost EE 515 Calibration dates lost EE 522 GPIB communication data lost EE 610 Questionable calibration SE 900 Internal system error EE EE error event SE status event SYS system error event C Emulation Commands C 2 Emulation Commands HP 6632A power
122. ned back on 2 The operation event register can be read to determine if the power supply is in current limit and if the output has tripped turned off as a result of the current limit condition See Section 7 for details Table 2 4 Current limit type CURRent TYPe command parameters Parameter choice Current limit effect Output state External relay state LIMit Current will be limited Remains on Not affected TRIP Current will trip Goes off Not affected LIMRELAY or Current will be limited Remains on Tracks current limit state LIMITRELAY TRIPRELAY Current will trip Goes off Tracks current limit state Basic Power Supply Operation 2 11 Reading back V and Actual V and I display mode Measured output voltages and currents are displayed with the actual V and I display mode selected This display mode is selected as follows NOTE _ If output settings are presently being displayed as denoted by a blinking digit in the voltage or current field keep pressing the SET key until the blinking stops The in strument can now display measured readings Press the DISPLAY key to access the display menu Press the or key until ACTUAL V AND P is displayed 3 Press ENTER Voltage readings are located on the top line of the display and current readings are located on the bottom line NOTE For details on display modes see Display modes in Section 1 Measurement configuration CURRE
123. nse messages A response message is the message sent by the instrument to the computer in response to a query command program message Sending a response message After sending a query command the response message is placed in the output queue When the power supply is then addressed to talk the response message is sent from the output queue to the computer Multiple response messages If you send more than one query command in the same program message see Multiple com mand messages the multiple response messages for all the queries are sent to the computer when the power supply is addressed to talk The responses are sent in the order the query com mands were sent and are separated by semicolons Items within the same query are separated by commas The following example shows the response message for a program message that contains four single item query commands 0 1 1 0 Response message terminator RMT Each response is terminated with an LF line feed and EOI end or identify The following example shows how a multiple response message is terminated 0 1 1 0 lt RMT gt Message exchange protocol Two rules summarize the message exchange protocol Rule 1 You must always tell the power supply what to send to the computer The following two steps must always be performed to send information from the instrument to the computer 1 Send the appropriate query command s in a program message 2 Address the
124. nt the response message is placed in the output queue When data is placed in the output queue the message available MAV bit in the status byte register sets A data message is cleared from the output queue when it is read The output queue is considered cleared when it is empty An empty output queue clears the MAV bit in the status byte register A message is read from the output queue by addressing the power supply to talk after the appropriate query is sent 7 18 Status Structure Error queue The error queue holds error and status messages When an error or status event occurs a mes sage that defines the error status is placed in the error queue When a message is placed in the error queue the error available EAV bit in the status byte register is set An error status message is cleared from the error queue when it is read The error queue is considered cleared when it is empty An empty error queue clears the EAV bit in the status byte register The error queue holds up to 10 error status messages The commands to read the error queue are listed in Table 7 6 When you read a single message in the error queue the oldest message is read and then removed from the queue If the queue becomes full the message 350 queue overflow will occupy the last memory location On power up the error queue is empty When empty the message 0 No Error is placed in the queue Messages in the error queue are preceded
125. o cee eeeeseesseeseeeeeeseesseeeeeaeeseeeas SPE SPD serial polling eee Front panel aspects of GPIB operation eee Remote indicator and LOCAL key eee Error and status messages seseeeeeeeeeee Programming Syntax i a esee cisterna tiet dh eene iisa Command Words tret ii te itte che tr a aiad Progr m messages 2c cscs eeeccaep sed suege eeeees tassdecteecneeceeedecbevecneees Response messages ssissescscesusessesddiadensvasegaronssdeavesonseteaaenvesosneseatdnes Message exchange protocol eee 7 Status Structure OVELVICW Status byte and SRO edes eire tt iee eee terio rire eerie Status register SCtS eese eene nennen nnne nnne tene testen nennen QUEUES c Clearing registers and queues esee Programming and reading registers eee Programming enable registers eee Reading Teglsters ete uitio ne ot i Status byte and service request SRQ eese Status byte Teglster s eere tipici eene ebbe ea the pee PER eese renes Service request enable register sese Serial polling and SROQ eese eene eene neenon tne Status byte and service request commands Status register Sets ine aee ipee edt e sura steeds aee rana Eee Dea Register bit descriptions esesesee
126. on 10 for details For the Pulse Current and Long Integration display modes NO PULSE is displayed if the output is off or pulses are not detected output on See Sections 3 and 4 for details When a change is made that affects the readings being taken dashes are displayed instead of readings The dashes remain until a valid reading for the new condition is taken Any one of the four display modes can be the power on default Use the SAVE SETUP item of the MENU to save the selected display mode in memory and use the POWER ON SETUP item to specify the power on setup see Setups under Default set tings for details Default settings The power supply can be set to power on to the factory default conditions RST defaults or to user saved setup conditions The factory default conditions are listed in Table 1 1 Table 1 1 Factory defaults RST Setting RST default Output value settings Voltage V 0 000V Current A 0 2500A Output state operate Off Display type Actual V and I GPIB address GPIB output format Current range Integration rate Average readings Power on setup Current limit mode Output relay Pulse current High time Low time No effect factory set to 16 No effect factory set to Keithley and Exponential 5 amps Auto Range off 1 00 PLC 1 No effect factory set to RST Lim No effect after power cycle set to zero 33 usec 33 usec 1 10 Getting Started Table 1 1
127. on commands Most of the Fluke commands are already covered in the SCPI command reference section However a few commands were added to specifically emulate the Fluke power supply These commands are listed in Table C 2 Details on these commands follow the table Table C 2 Fluke commands used to control Model 2303 2303B 2303 P Command Description RST Default SOURce SOURce Subsystem VOLTage Path to configure voltage PROTection Path to set voltage limit LEVel lt NRf gt NOOP no operation Power supply does not use voltage LEVel limit INSTrument Returns a meaningless value STATe lt b gt Path to control power supply output OFF STATe Enable or disable power supply output Query state of power supply output VOLTage PROTection lt NRf gt No operation for the power supply VOLTage PROTection Returns meaningless response message Description These commands are used to set an output voltage limit for the Fluke PM2811 Power Supply The power supply does not support voltage limit These commands can be sent to the power supply without causing an error but are in effect NOOPs no operations The query command will return a value but it is meaningless The complete SCPI command paths for these commands are shown in Table C 2 NOTE The query response is affected by the GPIB output format For decimal formats the response has the specified decimal places otherwise it is in exponential format
128. on the 500 milliamps range will be the same when switching from the 5A range to the 500 milliamps range Current ranges The power supply current ranges are listed in Table 2 1 With auto range selected the instru ment will automatically go to the most sensitive range to perform the measurement Table 2 1 Current ranges Power supply Current ranges Models 2303 and 2303B 5A 5mA and AUTO Model 2303 PJ 5A 500mA and AUTO Current range selection The current measurement range is selected from the current range item of the menu The menu is accessed by pressing the MENU key NOTE Table 1 2 in Section 1 shows the menu structure Rules to navigate the menu follow the table Current limit modes Ifthe current limit is reached the output will either turn off trip or stay on lim The current limit can also be used to control an external relay Section 5 The four current limit modes are summarized in Table 2 2 and explained below NOTE The LIMIT RELAY and TRIP RELAY modes are available in the Models 2303 and 2303B with firmware revision A06 and later Use the FIRMWARE REVISION selection in the MAIN MENU to display the revision level Basic Power Supply Operation 2 5 Table 2 2 Front panel current limit selections Submenu choice Current limit effect Output state External relay state LIMIT Current will be limited Remains on Not affected TRIP Current will trip Goes off Not affected L
129. ontrol an external relay The control circuit is made up of an open collector transistor that functions as a switch for the external relay a 5 VDC source 100mADC maximum and a chassis ground return The drive for the relay may be provided by the supplied 5VDC source or an external DC voltage source Figure 5 1 shows the simplified control circuit in the power supply and shows a typical con figuration to control an external relay As shown in the illustration voltage applied to the power supply must not exceed 15VDC and current for the relay circuit must not exceed 150mADC If the supplied 5VDC source is used to drive the external relay the relay circuit must not exceed 100mADC Also note that a protection diode is required for the relay circuit The protection diode pro vides a current dissipation path for fly back voltage from the relay coil that occurs when the con trol circuit is opened Without the diode the high fly back voltage could damage the power supply CAUTION To prevent damage to the power supply that is not covered by the warranty adhere to the following precautions ALWAYS use a protection diode for the relay circuit as shown in Figure 5 1 Do not exceed the voltage and current limits of the RELAY CONTROL port of the power supply 15VDC and 150mADC Connect and disconnect relay drive circuits with the power supply power OFF NOTE Thecurrent limit can also be used to control the external relay Refer to
130. oper ation event has occurred Depending on how it is used Bit B6 of the status byte register is either the request for service RQS bit or the master summary status MSS bit When using the serial poll sequence of the power supply to obtain the status byte a k a serial poll byte B6 is the RQS bit See Serial Polling and SRQ for details on using the serial poll sequence When using the STB command see Table 7 3 to read the status byte B6 is the MSS bit Service request enable register The generation of a service request is controlled by the service request enable register This register is programmed by the user and is used to enable or disable the setting of bit B6 RQS MSS by the status summary message bits BO B2 B3 B4 B5 and B7 of the status byte reg ister As shown in Figure 7 3 the summary bits are logically ANDed amp with the corresponding enable bits of the service request enable register When a set 1 summary bit is ANDed with an enabled 1 bit of the enable register the logic 1 output is applied to the input of the OR gate and therefore sets the MSS RQS bit in the status byte register 7 8 Status Structure The individual bits of the service request enable register can be set or cleared by using the SRE common command To read the service request enable register use the SRE query com mand The service request enable register clears when power is cycled or a parameter value of 0
131. ormat ASCii SREal or DREal ASCii A BORDer Specify byte order NORMal or SWAPped SWAP B name FORMat DATA ty pe Select data format FORMat DATA type Parameters type ASCi ASCII format SREal IEEE754 single precision format DREal IEEE754 double precision format This command is used to select the data format for transferring readings over the bus The reading s that is sent voltage current pulse current DVM or long integration depends on the presently selected function See the FUNCtion command SENSe subsystem and signal ori ented measurement commands for more information NOTE Regardless of which data format for output strings is selected the power supply will only respond to input commands using the ASCII format ASCII format The ASCII data format is in a direct readable form for the operator Most Basic languages easily convert ASCII mantissa and exponent to other formats However some speed is compro mised to accommodate the conversion The following shows the ASCII format for a reading of 10 058 volts 1 00580000 E 01 IEEE754 formats SREal will select the binary IEEE 754 single precision data format Figure 10 1 shows the normal byte order format for each data element voltage current etc Note that the data string for each reading conversion is preceded by a 2 byte header that is the binary equivalent of an DISPlay FORMat and SYSTem 10 5 ASCII sign and 0 No
132. peration Introduction Describes the IEEE 488 GPIB standards used by the power supply GPIB bus connections Shows how to connect the power supply to the GPIB Primary address Explains how to check and or change the primary address for the bus Output format Covers the output formats for readings sent over the bus and output types for the response to IDN General bus commands Documents general bus commands that pertain to all GPIB instruments Programming syntax Provides syntax information for sending command and SCPI commands over the bus 6 2 GPIB Operation Introduction The GPIB bus is the IEEE 488 instrumentation data bus with hardware and programming standards originally adopted by the IEEE Institute of Electrical and Electronic Engineers in 1975 The power supply conforms to these standards TEEE 488 1987 1 EEE 488 1987 2 These standards define a syntax for sending data to and from instruments how the instrument interprets this data what registers should exist to record the state of the instrument and a group of common commands SCPI 1995 0 Standard Commands for Programmable Instruments This standard defines a command language protocol It goes one step further than IEEE 488 1987 2 and defines a standard set of commands to control every programmable aspect of the instrument GPIB bus connections To connect the power supply to the GPIB bus use a cable equipped with standard
133. put of the digital voltmeter DVM 3 The PCURrent and LINTegration parameters for FUNCtion which are not listed in Table 2 5 select the pulse current and long integration measurement modes These measurement modes are covered in Sections 3 and 4 respectively B SENSe AVERage lt NRf gt 1 When requesting a single reading FETch READ or MEASure average count specifies the number of measurement conversions to average for the reading For exam ple with the average count set to 10 READ will trigger 10 measurement conversions and return and display the average of those 10 conversions Basic Power Supply Operation 2 13 2 When requesting an array of readings FETCh ARRay READ ARRay or MEASure ARRay average count specifies the number of measurements to place in an array For example with the average count set to 10 READ ARRay will trigger and return 10 readings 3 Signal oriented measurement commands e g READ are covered in Section 9 Independent voltage measurements DVM The power supply has an independent digital voltmeter DVM that can measure up to 20VDC Connections for the DVM are shown in Figure 2 1 DVM input display mode The DVM input display mode must be selected in order to measure voltage applied to DVM input of the power supply This display mode is selected as follows NOTE _ If output settings are presently being displayed as denoted by a blinking digit in the volt
134. r is used the instru ment is programmed to the largest allowable value Examples SENSe NPLCycles 2 Set integration period to 2 PLC SSENSe NPLCycles DEFault Set integration period to 1 PLC SSENSe NPLCycles MINimum Set integration period to 0 01 PLC SENSe NPLCycles MAXimum Set integration period to 10 PLC e lt numlist gt Numlist Specify one or more numbers for a list Example STATus QUEue ENABIle 110 222 Enable errors 110 thru 222 Angle Brackets gt Angle brackets gt are used to denote a parameter type Do not in clude the brackets in the program message For example OUTPut b The b indicates that a Boolean type parameter is required Therefore to turn on the output the command with the ON or 1 parameter must be sent as follows OUTPut ON OUTPut 1 Query commands This type of command requests queries the presently programmed status It is identified by the question mark at the end of the fundamental form of the command Most commands have a query form Example SENSe CURRent RANGe Queries the present current range Most commands that require a numeric parameter lt n gt can also use the DEFault MINi mum and MAXimum parameters for the query form These query forms are used to determine the RST default value and the upper and lower limits for the fundamental command Examples SENSe CURRent RANGe DEFault Queries the RST default value SENSe CURRent RANGe MINimum Quer
135. ructure SYSTem subsystem 10 7 SYSTem POSetup name An Interworld Highway LLC Company Specifications are subject to change without notice All Keithley trademarks and trade names are the property of Keithley Instruments Inc All other trademarks and trade names are the property of their respective companies KEITHLEY Keithley Instruments Inc Sales Offices BELGIUM CHINA FINLAND FRANCE GERMANY GREAT BRITAIN INDIA ITALY JAPAN KOREA NETHERLANDS SWEDEN TAIWAN 28775 Aurora Road Cleveland Ohio 44139 440 248 0400 Fax 440 248 6168 1 888 KEITHLEY 534 8453 e www keithley com Bergensesteenweg 709 B 1600 Sint Pieters Leeuw 02 363 00 40 Fax 02 363 00 64 Yuan Chen Xin Building Room 705 12 Yumin Road Dewai Madian Beijing 100029 8610 82251886 Fax 8610 82251892 Halsuantie 2 e 00420 Helsinki Finland 09 53 06 65 60 Fax 09 53 06 65 65 3 all e des Garays 91127 Palaiseau C dex 01 64 53 20 20 Fax 01 60 11 77 26 Landsberger Strasse 65 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 Unit 2 Commerce Park Brunel Road Theale Berkshire RG7 4AB 0118 929 75 00 Fax 0118 929 75 19 1 5 Eagles Street Langford Town Bangalore 560 025 080 212 80 27 Fax 080 212 80 05 Viale San Gimignano 38 20146 Milano 02 48 39 16 01 Fax 02 48 30 22 74 New Pier Takeshiba North Tower 13F 11 1 Kaigan 1 chome Minato ku Tokyo 105 0022 81 3 5733 7
136. rument is in remote all front panel keys except for the LOCAL key are locked out The LOCAL key cancels the remote state and restores local operation of the instrument Pressing the LOCAL key also turns off the R indicator and returns the display to normal if a user defined message was displayed If the LLO local lockout command is in effect the LOCAL key is also inoperative Error and status messages See Appendix B for a list of error and status messages associated with IEEE 488 program ming The instrument can be programmed to generate an SRQ and command queries can be per formed to check for specific error conditions GPIB Operation 6 7 Programming syntax The information in the following paragraphs covers syntax for both common commands and SCPI commands For information not covered here see the IEEE 488 2 and SCPI standards Command words Program messages are made up of one or more command words and parameters Commands and command parameters Common commands and SCPI commands may or may not use a parameter The following are some examples SAV lt NRf gt Parameter NRf required RST No parameter used DISPlay TEXT STATe lt b gt Parameter lt b gt required STATus PRESet No parameter used Put at least one space between the command word and the parameter Brackets Some command words are enclosed in brackets These brackets are used to denote an optional command word that does not need
137. s such as DCL that have the same general mean ing regardless of the instrument Table 6 1 lists the general bus commands Table 6 1 General bus commands Command Effect on power supply REN Goes into remote when next addressed to listen IFC Reset interface all devices go into talker and listener idle states LLO Local key locked out GTL Cancel remote restore front panel operation for the power supply DCL Return all devices to known conditions SDC Returns power supply to known conditions GET Initiates a trigger SPE SPD Serial polls the power supply REN remote enable The remote enable command is sent to the power supply by the controller to set up the instru ment for remote operation Generally the instrument should be placed in the remote mode before you attempt to program it over the bus Simply setting REN true does not actually place the instrument in the remote state You must address the instrument to listen after setting REN true before it goes into remote Note that the instrument does not have to be in remote to be a talker Also note that all front panel controls except for LOCAL and POWER are inoperative while the instrument is in remote You can restore normal front panel operation by pressing the LOCAL key IFC interface clear The IFC command is sent by the controller to place all instruments on the bus in the local talker listener idle states The power supply responds to the IFC command b
138. s greater than 3A setting output voltage greater than 9V will automatically set current limit to 3A ISET n Set current limit value Parameters n 0to5 Set current limit in amps MINimum 1 25mA MAXimum 5A DEFault 0 25A Emulation Commands C 3 Query ISET Query programmed current limit ISET MINimum Query lowest allowable current limit 1 25mA ISET MAXimum Query highest allowable current limit ISET DEFault Query RST default current limit 0 25A Description This command is used to set the current limit for the power supply The max imum allowable current limit value depends on measurement range and the output voltage value 5A or AUTO measurement range selected With output voltage set to OV or less the maximum allowable current limit is 5A Above 9V the maxi mum allowable current limit is 3A Models 2303 and 2303B 5mA measurement range selected The maxi mum allowable current limit is 1A Model 2303 PJ 500mA measurement range selected The maximum al lowable current limit is 0 6A Programming resolution is 1 25mA OCP b Select current limit type Parameters b 1 or ON Select TRIP current limit type 0 or OFF Select LIMit current limit type Description This command is used to select the action that occurs when current limit is reached With LIMit selected output current will clamp at the programmed limit In this condition the power supply operates as a constant current sour
139. se the s o and z keys to key in the desired current limit and press SET to exit from the output settings mode Editing shortcuts With the output OFF the following editing shortcuts can be used Output voltage can be quickly set to the maximum value by incrementing the tens digit MSD Note that if the tens digit is zero it is not displayed Place the cursor to the left of the units digit Output voltage can be quickly set to zero 0 000 V by decrementing the first leading zero of the reading If there is no leading zero decrement the tens digit Current limit on the 5A range can be quickly set to its maximum value by incrementing the units digit MSD Current limit on either range can be quickly set to the minimum value 0 0001 A by decrementing the first leading zero of the reading If there is no leading zero decrement the units digit Editing restrictions With the output ON the following editing restrictions are in effect You cannot increment a digit that would display a value that exceeds the maximum For example for the value 14 200 V you cannot increment the 1 or the 4 since the resultant value would exceed 15 000 V When decrementing a digit only that digit and digits to the left are affected The digits to the right of the cursor are not changed 2 8 Basic Power Supply O peration NOTES The SET key is active in any front panel menu or display mode If not already in the output settings
140. supply emulation commands The Hewlett Packard commands that can be used to control the power supply are summarized in Table C 1 Details on these commands follow the table Table C 1 HP commands used to control the power supply Command Description UR VSET n Set voltage output in volts 0 to 15 OV VSET Query output voltage ISET lt n gt Set current limit in amps 0 00125 to 5 0 25V ISET Query current limit OCP lt b gt Select current limit type 1 TRIP 0 LIMit OUT lt b gt Enable or disable the power supply output OFF OUT Query state of power supply output VOUT Trigger and return one output voltage reading IOUT Trigger and return one output current reading ID Returns the model number of the instrument KI2303 KI2303B or K12303 PJ VSET lt n gt Set output voltage value Parameters n Otol5 Set output voltage in volts MINimum OV MAXimum 15V DEFault OV Query VSET Query programmed output voltage VSET MINimum Query lowest allowable voltage OV VSET MAXimum Query highest allowable voltage 15V VSET DEFault Query RST default voltage OV Description This command is used to program the output voltage of the power supply Voltage can be set from 0 to 15V If the output is on when this command is sent the display will update immediately when this command is sent If the output is off the display will update when the output is turned on NOTE Ifthe present current limit setting i
141. switching card When fuses are used in a product replace with same type and rating for continued protection against fire hazard Chassis connections must only be used as shield connections for measuring circuits NOT as safety earth ground connections If you are using a test fixture keep the lid closed while power is applied to the device under test Safe operation requires the use of a lid interlock Ifa screw is present connect it to safety earth ground using the wire recommended in the user documentation The IN symbol on an instrument indicates that the user should refer to the operating instructions located in the manual The A symbol on an instrument shows that it can source or measure 1000 volts or more including the combined effect of normal and common mode voltages Use standard safety precautions to avoid personal contact with these voltages The al symbol indicates a connection terminal to the equipment frame The WARNING heading in a manual explains dangers that might result in personal injury or death Always read the associated information very carefully before performing the indicated procedure The CAUTION heading in a manual explains hazards that could damage the instrument Such damage may invalidate the war ranty Instrumentation and accessories shall not be connected to humans Before performing any maintenance disconnect the line cord and all test cables To maintain protection from electric shock and fire rep
142. t conversions to average for each reading For example with a reading count of 5 each displayed reading will be the average of five measurement conversions The AVERAGE READINGS item of the menu is also used to set the average reading count for DVM measurements Note that it is not used to set the average reading count for pulse cur rent and long integration measurements These measurements are covered in Sections 3 and 4 respectively SCPI programming measure V and I and DVM input The commands to measure output voltage and current and the DVM input are summarized in Table 2 5 The Programming examples at the end of this section demonstrates how to use these commands Table 2 5 SCPI commands measure V and I and DVM input Commands Description Default Ref SENSe SENSe subystem FUNCtion lt name gt Select readback function VOLTage CURRent A or DVMeter VOLT NPLCycles lt n gt Set integration rate in line cycles for voltage current 1 0 and DVM measurements 0 01 to 10 AVERage lt NRf gt Specify the average count for voltage current and 1 B DVM measurements to 10 READ Trigger and return one reading B READ ARRay Trigger an array of readings and return them B A SENSeFUNCtion lt name gt 1 The parameter name can instead be enclosed in single quotes e g CURRent 2 With DVMeter selected the instrument measures the voltage applied to the in
143. t shown in Figure 10 1 is a byte for the terminator that is attached to the end of each data string Figure 10 1 IEEE 754 single precision data format Header Byte 1 Byte 2 Byte 3 Byte 4 0 un s sign bit 0 positive 1 negative e exponent bits 8 f fraction bits 23 Normal byte order shown For swapped byte order bytes sent in reverse order Header Byte 4 Byte 3 Byte 2 Byte 1 The Header is only sent once for each measurement conversion DREal selects the binary IEEE 754 double precision data format and is shown in Figure 10 2 normal byte order shown This format is similar to the single precision format except that it is 64 bits long During binary transfers never un talk the power supply until after the data is read input to the computer Also to avoid erratic operation the readings of the data string and terminator should be acquired in one piece The header 0 can be read separately before the rest of the string The number of bytes to be transferred can be calculated as follows Bytes 2 Rdgsx 4 1 for SREAL Bytes 2 Rdgs x 8 1 for DREAL where 2 is the number of bytes for the header 0 Rdgs is the number of readings to be transferred 4 or 8 is the number of bytes for each reading 1 is the byte for the terminator For example assume that the power supply is configured to trigger 10 voltage readings and send the 10 voltage measurements to the
144. tatus Structure 7 15 Condition registers As Figure 7 1 shows each status register set except the standard event register set has a con dition register A condition register is a real time read only register that constantly updates to reflect the present operating conditions of the instrument For example when a current pulse is not detected bit B4 PTT of the measurement condition register will be set 1 When the pulse is detected the bit clears 0 The commands to read the condition registers are listed in Table 7 3 For details on reading registers see Reading registers Table 7 3 Common and SCPI commands condition registers Command Description STATus STATus subsystem Read operation condition register Read measurement condition register Read questionable condition register OPERation CONDition MEASurement CONDition QUEStionable CONDition Event registers As Figure 7 1 shows each status register set has an event register When an event occurs the appropriate event register bit sets to 1 The bit remains latched to 1 until the register is reset Reading an event register clears the bits of that register CLS resets all four event registers The commands to read the event registers are listed in Table 7 4 For details on reading reg isters see Reading registers Table 7 4 Common and SCPI commands event registers Command Description Default Note ESR
145. ted Display modes For voltage and current readings there are four display modes described as follows ACTUAL V AND I This display mode is used to read back the actual output voltage and current This display mode is the RST default See Section 2 for details DVM INPUT This mode is used to display the DC voltage applied to the DVM input of the power supply See Section 2 for details PULSE CURRENT This mode is used to display high low or average pulse current measurements See Section 3 for details LONG INTEGRATION This mode is used to display average current measure ments of a pulse or pulses using the long integration method See Section 4 for details A display mode is selected as follows 1 Press the DISPLAY key and use the A or v key to display the desired mode ACTUAL V AND I DVM INPUT PULSE CURRENT or LONG INTEGRATION With the desired mode displayed press ENTER Note that after selecting PULSE CUR RENT use the A or v key to select the desired pulse measurement pulse high pulse low or pulse average Examples of the display modes are shown as follows Actual V and I 6 116 V ON 1 2058A DVM input DVM INPUT ON 4 993 V Pulse current PULSE HI ON 2 1947 A PULSE LO ON 0 2147 A PULSE AVG ON 1 1495 A Long integration LONG INT ON 1 0236 A Getting Started 1 9 NOTES ON indicates that the output is turned on With the output turned off OFF is dis played See Secti
146. the following event registers to 0 CLS Standard event register Operation event register Measurement event register Questionable event register STATus STATus subsystem PRESet Reset all bits of the following enable registers to 0 Note 1 Operation event enable register Measurement event enable register Questionable event enable register To clear error queue CLS Clear all messages from error queue Note 2 STATus STATus subsystem QUEue Error queue NEXT Read and clear the oldest error status message CLEar Clear all messages from error queue Note 3 SYSTem SYSTem subsystem ERRor Read and clear the oldest error status message CLEar Clear all messages from error queue Note 3 Notes 1 The standard event enable register is not reset by STATus PRESet or CLS Send the 0 parameter value with ESE to reset all bits of that enable register to 0 see Status byte and service request commands 2 STATus PRESet has no effect on the error queue 3 Use either of the two CLEar commands to clear the error queue Status Structure 7 5 Programming and reading registers Programming enable registers The only registers that can be programmed by the user are the enable registers All other reg isters in the status structure are read only registers The following explains how to ascertain the parameter value for the various commands used to program enable registers The actual com mands are covered later in this section see Tab
147. the summary bits of four status register sets and two queues The register sets and queues monitor the various instrument events When an enabled event Occurs it sets a summary bit in the status byte register When a summary bit of the status byte is set and its corresponding enable bit is set as programmed by the user the RQS MSS bit will set to indicate that an SRQ has occurred Status register sets A typical status register set is made up of a condition register an event register and an event enable register A condition register is a read only register that constantly updates to reflect the present operating conditions of the instrument When an event occurs the appropriate event register bit sets to 1 The bit remains latched to 1 until the register is reset When an event register bit is set and its corresponding enable bit is set as programmed by the user the output summary of the register will set to 1 which in turn sets the summary bit of the status byte register Queues The power supply uses an output queue and an error queue The response messages to query commands are placed in the output queue As various programming errors and status messages occur they are placed in the error queue When a queue contains data it sets the appropriate summary bit of the status byte register Status Structure 7 3 Figure 7 1 Status model structure Questionable Event Registers Event Condition Event Enable Register Register R
148. to VOLTage is affected by the GPIB output format For decimal formats the response has three decimal places otherwise it is in exponential format see Section 10 for details CURRent n 1 5A or AUTO measurement range selected With output voltage set to lt 9V the maxi mum current limit value is 5A With voltage set to 29V the maximum current limit is 3A 2 Models 2303 and 2303B With the 5mA measurement range selected the maximum current limit is 1A Sending a value that exceeds 1A is rejected and the following message is displayed briefly CURRENT LIMIT ON mA RANGE lt 1A 3 Model 2303 PJ With the 500mA measurement range selected the maximum current limit is 0 6A Sending a value that exceeds 0 6A is rejected and the following message is displayed briefly CURRENT LIMIT ON mA RANGE lt 0 6A 4 Theresponse to CURRent is affected by the GPIB output format For decimal formats the response has four decimal places otherwise it is in exponential format see Section 10 for details 2 10 Basic Power Supply Operation E CURRentTYPe name Parameters are summarized in Table 2 4 and described as follows 1 With the LIMit type selected the output will remain on when the current limit is reached With the TRIP mode selected the output will turn off when the current limit is reached With the LIMRELAY or LIMITRELAY mode Figure 2 3 the relay output turns on ONE when the current limit is reache
149. turn a single averaged reading and the READ ARRay command is used to trigger and return an array of readings The averaged read ing or reading array is sent to the computer when the power supply is addressed to talk The aver aged reading is displayed on the front panel The front panel does not show an array of readings only the average of an array The number of readings to average or put in an array is set using the SENSe AVERage for voltage current and DVM readings or SENSe PCURrent AVERage for pulse current read ings command See Sections 2 and 3 for details NOTES 1 A READ reading can be returned in exponent form i e 10V returned as 1 00000000E 01 or as a decimal reading i e 10V returned as 10 0000 10 000 or 10 00 The reading format is selected from the GPIB MENU OUTPUT FORMAT item of the menu see Output Format in Section 6 for details 2 READ ARRay readings are always sent in exponent form 3 There are no AVERage commands for long integration measurements The array size for long integration readings is fixed at one Therefore both READ and READ ARRay will return a single long integration reading 9 4 Signal Oriented Measurement Commands MEASu re function Execute READ on specified function MEASu re ARRay lt fi unction gt Execute READ ARRay on specified function Parameters function CURRent DC Measure current VOLTage DC Measure voltage PCURrent Measure pulse current
150. ulse is not detected When the pulse is detected the digitization process syncs up to the edge specified by the following command SENS PCUR MODE lt name gt lt name gt HIGH or AVER Sync up to rising edge of pulse LOW Sync up to falling edge of pulse After any specified delay period expires the instrument takes the number of readings specified by the average count command SENS PCUR AVER lt NRf gt NRf _ 1 to 5000 Digitize 1 to 5000 readings NOTE Although the integration time is 33usec some processing time is needed between readings The time between readings including integration and processing time is about 276ysec 3 10 Pulse Current Measurements Programming examples Pulse current measurements The following command sequence will return the average of 10 peak pulse current measurements SENS RANG 5 Select 5A range VOLT 15 Set output voltage to 15V CURR 0 75 Set current limit to 750mA OUTP ON Turn output on SENS PCUR AVER 10 Set average count to 10 SENS PCUR TIME AUTO Set integration times automatically SENS PCUR SYNC TLEV 0 1 Set trigger level to 100mA SENS PCUR SYNC DEL 50e 3 Set trigger delay to 50msec SENS FUNC PCUR Select pulse current function SENS PCUR SYNC ON Enable trigger synchronization SENS PCUR MODE HIGH Configure to measure peak pulse READ Trigger 10 measurement conversions and return the average of those 10 conversions Pulse current d
151. ure the voltage and current settings are appropriate for detecting pulses Determining correct trigger level pulse current 1 2 3 If using Model 2303 PJ make sure it is on the same current range 5A or 500mA that is being used for pulse measurements step 1 of the Pulse current measurement procedure Turn on the output Select the pulse current display type If the trigger level is too low or too high the NO PULSE message will be displayed If pulse current measurements are instead being dis played the trigger level is valid You can skip the rest of this procedure Go into the menu select PULSE CURRENT and then TRIGGER LEVEL Change the PULSE TRIG LEVEL and press ENTER If the trigger level is still too low or too high the A D PULSE TRIG NOT DETECTED message will be displayed briefly Note that it may take a few seconds for the message to appear If the message appeared repeat step 5 until a valid trigger level is found Use the MENU key to back out of the menu structure and display pulse current measurements Pulse Current Measurements 3 7 SCPI programming Table 3 1 SCPI commands pulse current measurements Commands Description Default Ref SENSe SENSe subystem FUNCtion PCURrent Select pulse current measurement function VOLT A PCURrent Pulse current configuration AVERage lt NRf gt Specify average count 1 to 100 or 1 to 5000 pulse 1 B current digitization MODE name Sele
152. ution 0 25 D TYPe lt name gt Select current limit type LIMit TRIP LIM E LIMRELAY LIMITRELAY or TRIPRELAY STATe Query state of current limit F OUTPut OUTPut subsystem STATe lt b gt Turn the power supply output on or off OFF LIMRELAY LIMITRELAY and TRIPRELAY available in Models 2303 2303B with firmware revision level A06 and higher A Basic Power Supply Operation 2 9 SEN Se CU RRentRANGe n 1 After specifying a current value the instrument will go to the most sensitive range to accommodate that reading For example if you are going to set current limit to 750mA you can let lt n gt 0 75 or 750e 3 to select the 5A range Another way to select a range is to use the MINimum and MAXimum parameters as follows SENS CURR RANG MIN Select the low current range 5mA or 500mA SENS CURR RANG MAX Select the high current range 5A 2 Using this command to manually select the current range disables auto range SEN Se CURRent RANGe AUTO lt b gt This command is coupled to the RANGe lt n gt command When auto range is enabled the parameter value lt n gt for RANGe changes to the automatically selected range value If you then disable auto range the instrument will remain at the automatically selected range VOLTage lt n gt 1 Ifthe present current limit value is above 3A setting the output voltage above 9V will automatically default the current limit to 3A 2 The response
153. y being displayed as denoted by a blinking digit in the voltage or current field keep pressing the SET key until the blinking stops The instrument can now display measured readings 1 Press the DISPLAY key to access the display menu 2 Press the A or v key until LONG INTEGRATION is displayed and press ENTER NOTE For details on display modes see Display modes in Section 1 Long integration measurement procedure The following steps summarize the procedure to perform long integration current measurements 1 For Model 2303 PJ select the desired measurement range 5A or 500mA from the CURRENT RANGE item of the menu For Models 2303 and 2303B long integration measurements are automatically performed on the 5A range 2 Fromthe LONG INTEGRATION item of the menu set integration time pulse timeout trigger edge and trigger level if appropriate NOTE Ifyou select AUTO TIME to set the integration time the pulse timeout message LONG INT TRIG NOT DETECTED will occur before the output is turned on step 3 This message indicates that the integration time has not been updated To update the integration time you will have to again select AUTO TIME after the output is turned on in step 3 Setting the trigger level with the output off will also cause the pulse timeout message to appear However the trigger level will be set 3 Setthe output voltage and current limit and press OPERATE 4 Press the DISPLAY key and select the
154. y canceling front panel TALK or LSTN lights if the instrument was previously placed in one of those states Note that this command does not affect the status of the instrument settings data and event registers are not changed To send the IFC command the controller must set the IFC line true for a minimum of 100ps GPIB Operation 6 5 LLO local lockout Use the LLO command to prevent local operation of the instrument After the unit receives LLO all its front panel controls except POWER are inoperative In this state pressing the LOCAL key will not restore control to the front panel The GTL command restores control to the front panel GTL go to local Use the GTL command to put a remote mode instrument into local mode The GTL command also restores front panel key operation DCL device clear Use the DCL command to clear the GPIB interface and return it to a known state Note that the DCL command is not an addressed command so all instruments equipped to implement DCL will do so simultaneously When the power supply receives a DCL command it clears the input buffer and output queue cancels deferred commands and clears any command that prevents the processing of any other device command A DCL does not affect instrument settings and stored data SDC selective device clear The SDC command is an addressed command that performs essentially the same function as the DCL command However since each device must be indiv
155. y the current is fluctuating around the current limit point Figure 2 3 Relay control mode limit relay Limit Setting Current On Relay Off Figure 2 4 Relay control mode trip relay Limit Setting Current Output turns of due to Trip Mode User turns output on and trip condition is corrected Otherwise output will trip again On Relay Off Basic Power Supply Operation 2 7 Current limit mode selection The current limit mode is selected from the current lim mode item of the menu The menu is accessed by pressing the MENU key NOTE Table 1 2 in Section 1 shows the menu structure Rules to navigate the menu follow the table Procedure to edit voltage and current values The following procedure assumes that the appropriate current range is already selected Editing keys Once in the output settings mode the four editing keys s o and z are used to set values Cursor position blinking digit is controlled by the s and e keys With the cursor positioned on a digit increment or decrement the value using the and keys Perform the following steps to edit voltage and current values 1 Press the SET key to select the output settings mode A blinking cursor appears in the voltage field of the display 2 Use the s o and keys to key in the desired output voltage value and press SET The blinking cursor moves to the current field of the display 3 U

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