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Chapter 7 Tutorial

Output Characteristics

149

Output Characteristics

An ideal constant-voltage power supply would have a zero output impedance

at all frequencies. Thus, as shown in Figure 7-3, the voltage would remain

perfectly constant in spite of any changes in output current demanded by the

load.

Figure 7-3. Ideal Constant Voltage Figure 7-4. Ideal Constant Current

Power Supply Power Supply

The ideal constant-current power supply exhibits an infinite output impedance

at all frequencies. Thus as Figure 7-4 indicates, the ideal constant-current

power supply would accommodate a load resistance change by altering its

output voltage by just the amount necessary to maintain its output current at

a constant value.

The output of this power supply can operate in either constant-voltage (CV)

mode or constant-current (CC) mode. Under certain fault conditions, the

power supply can not operate in either CV or CC mode and becomes

unregulated.

Summary of Contents for 2110-0457

Page 1: ...umber E3646 90001 October 2007 For Warranty information refer to the back of the manual Copyright Agilent Technologies Inc 2000 2007 All Rights Reserved Agilent E364xA Dual Output DC Power Supplies Ag...

Page 2: ...and high resolution Excellent load and line regulation Low ripple and noise Overvoltage protection Five Operating states storage Tracking operation Easy to use controls Remote voltage sensing Front a...

Page 3: ...ange selection Key 5 Overvoltage protection Key 6 Display limit Key 7 Resolution selection Keys 8 Voltage Current adjust selection Key 9 Knob 10 Output On Off Key 11 I O Configuration Menu Secure Key...

Page 4: ...Voltage Current adjust selection key Selects the knob control function for voltage or current adjustment 9 Knob Increases or decreases the value of the flashing digit by turning clockwise or counter c...

Page 5: ...b to current control mode by pressing key 5 Move the blinking digit to the appropriate position using the resolution selection keys and change the blinking digit value to the desired current limit by...

Page 6: ...ction is enabled when the OVP2 annunciator turns on or the overvoltage protection circuit has caused the power supply to shutdown when the annunciator blinks CAL The power supply is in calibration mod...

Page 7: ...pter 3 Set the GPIB address see chapter 3 Set the RS 232 baud rate and parity see chapter 3 1 AC inlet 2 Power line fuse holder assembly 3 Power line module 4 Output 1 Rear output terminals 5 Output 2...

Page 8: ...at may appear as you are working with the power supply Each listing contains information to help you diagnose and solve the problem Application Programs Chapter 6 contains some remote interface applic...

Page 9: ...8...

Page 10: ...1 Initial Inspection 31 Cooling and Location 31 Output Connections 32 Current Ratings 32 Voltage Drops 33 Load Consideration 33 Remote Voltage Sensing Connections 34 Multiple Loads 36 Chapter 3 Front...

Page 11: ...tion to a Computer or Terminal 62 RS 232 Troubleshooting 63 Calibration Overview 64 Calibration Security 64 To Unsecure for Calibration 65 To Secure Against Calibration 66 Calibration Count 67 Calibra...

Page 12: ...ing Commands 108 An Introduction to the SCPI Language 111 Command Format Used in This Manual 112 Command Separators 113 Using the MIN and MAX Parameters 113 Querying Parameter Settings 114 SCPI Comman...

Page 13: ...0 Troubleshooting Hints 171 Unit Reports Errors 740 to 750 171 Unit Fails Self Test 171 Bias Supplies Problems 171 Self Test Procedures 172 Power On Self Test 172 Complete Self Test 172 General Disass...

Page 14: ...est Record 191 Calibration Reference 192 Agilent Technologies Calibration Services 192 Calibration Interval 192 To Unsecure the Power Supply Without the Security Code 192 General Calibration Adjustmen...

Page 15: ...14 Contents Contents...

Page 16: ...1 Quick Start...

Page 17: ...ter prepare the power supply for use and help you get familiar with some of its front panel operations This chapter is intended for both the experienced and the inexperienced user because it calls att...

Page 18: ...power supply If the power supply does not turn on properly see page 20 3 Perform a complete self test The complete self test performs a more extensive set of tests than those performedatpower on Holdd...

Page 19: ...The annunciator OVP1 OVP2 CV OUT1 and low voltage range indication annunciator turn on for example 8V annunciator turns on for the E3646A model and the knob is selected for voltage control 2 Enable th...

Page 20: ...limitto1 0volttoassureCC operation TheCC annunciator will turn on To go back to normal mode press the key again or let the display time out after several seconds 5 Set the knob to the current control...

Page 21: ...at the power supply is turned on 2 Verify the power line voltage setting The line voltage is set to the proper value for your country when the power supplyisshippedfromthefactory Changethevoltagesetti...

Page 22: ...power line fuse on the rear panel 1 Remove AC line power 2 Remove the cover Refer to General Disassembly on page 174 3 Set two sections of the line voltage selector switch on the PC board for the des...

Page 23: ...the fuse holder assembly with a flat blade screwdriver from the rear panel 2 Remove the fuse holder from the assembly 3 Replace with the correct fuse 4 Replace the fuse holder assembly in rear panel V...

Page 24: ...hardware are included with each rack mounting kit Any Agilent Technologies System II instrument of the same size can be rack mounted beside the Agilent E3646A E3647A E3648A or E3649A Note Remove the...

Page 25: ...Instrument 24 To rack mount two instruments of the same depth side by side order lock link kit 5061 9694 and flange kit 5063 9214 To install two instruments in a sliding support shelf order support s...

Page 26: ...2 General Information...

Page 27: ...supply Thischapter alsoprovides instructionsforinstallationofyourpowersupplyandtheoutput connections Unless otherwise stated the information in this manual applies to all the four models This chapter...

Page 28: ...95 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use CSA C22 2 No 1010 1 92 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Us...

Page 29: ...Rack mount kit Agilent part number 5063 9243 0L2 Extra English manual set local language manual files are included on the CD ROM Agilent part number 5964 8251 Accessories The accessories listed below...

Page 30: ...fined operating states Automatic turn on self test Remote sense at rear panel terminals User calibration from the front panel or over the remote interfaces The front panel operation permits Easy to us...

Page 31: ...laying the limit values of voltage and current limit mode Checking the operating status from the annunciators Checking the type of error from the error codes messages Front panel binding posts are ava...

Page 32: ...display is not scratched or cracked Electrical Check Chapter 1 describes quick operation procedure that verifies to a high level of confidence that the power supply is operating in accordance with its...

Page 33: ...AWG 14 Note Whenmakingloadconnectionsfromtherearoutputterminals fourload wire connection is recommended to keep good CV load regulation if carrying full rated current of the power supply Current Rati...

Page 34: ...hesizeofthecapacitive load A large load capacitor may cause the power supply to cross into CC or unregulatedmodemomentarilywhentheoutputvoltageisreprogrammed The slew rateof theoutputvoltage will beli...

Page 35: ...ns Remote voltage sensing is used to maintain regulation at the load and reduce the degradation of regulation that would occur due to the voltage drop in the leads between the power supply and the loa...

Page 36: ...als of the power supply When remote sensing add 5 mV to this specification for each 1 V drop between the positive sensing point and outputterminal duetothechangeinloadcurrent Becausethesenseleads are...

Page 37: ...impedance of the power supply Each pair of wires should be asshortaspossibleandtwistedorbundledtoreduceleadinductanceandnoise pick up If a shield is used connect one end to the power supply ground ter...

Page 38: ...3 Front Panel Operation and Features...

Page 39: ...ing on page 40 Constant Current Operation starting on page 42 Tracking Operation starting on page 44 View Menu Operation starting on page 45 Configuring the Remote Interface starting on page 48 Storin...

Page 40: ...n also observe the change of the limit values when adjusting the knob If you press the key again or let the display time out after several seconds the power supply will return the display to the meter...

Page 41: ...et the display to the limit mode Notice that the Limit annunciator flashes indicating that the display is in the limitmode Whenthedisplayis inthelimitmode youcanseethevoltageand current limit values o...

Page 42: ...display is in the meter mode 8 Verify that the power supply is in the constant voltage mode Ifyouoperate thepower supply in theconstant voltage CV mode verifythat the CV annunciator is lit If the CC a...

Page 43: ...et the display to the limit mode Notice that the Limit annunciator flashes indicating that the display is in the limitmode Whenthedisplayis inthelimitmode youcanseethevoltageand current limit values o...

Page 44: ...display is in the meter mode 8 Verify that the power supply is in the constant current mode Ifyouoperatethepowersupplyintheconstantcurrent CC mode verifythat the CC annunciator is lit If the CV annunc...

Page 45: ...ddown keyuntiltheTrack annunciatorturnson Forexample when the track mode is first enabled with the output1 selected the output2 supply will be set to the same voltage level as the output1 supply Once...

Page 46: ...ront panel display will automatically return to the normal display to allow you to change the limit values After thedisplaymodeis settoV V or I Idisplaymode all theannunciators remain unchanged To exi...

Page 47: ...the display 3 Clear the errors and exit the menu All errors arecleared whenyou exit themenu bypressing key or letthe display time out for about 30 seconds See Error Messages for more information start...

Page 48: ...View menu and select CAL STRING 2 Scroll through the text of the message NO STRING is displayed if no calibration message is stored Press to increase the scrolling speed The Cal String can t be chang...

Page 49: ...or emphasis All other choices are dimmed The interface selection is stored in non volatile memory and does not change when power has been off or after a power on reset RST command GPIB Configuration 1...

Page 50: ...se the RS 232 interface by turning the knob 3 Select the baud rate Selectoneofthefollowing 300 600 1200 2400 4800 or9600 factorysetting baud 4 Select the parity and number of stop bits Select one of t...

Page 51: ...IT menubyturningthe knob then press the key pressed or let the display time out Front panel operation 1 Set up the power supply for the desired operating state The storage feature remembers output vol...

Page 52: ...ingpoweroff onorwithoutusing RST commandover the remote interface See page 92 for more details on RST command 3 Recall the stored operating state Remote interface operation Use the following commands...

Page 53: ...overvoltage condition Front panel operation Setting the OVP Level and Enable the OVP Circuit 1 Turn on the power supply or 2 Select the output to be programmed 3 Enter the OVP menu and set the desired...

Page 54: ...an external voltage source such as a battery disconnect it first Clear the overvoltage condition by adjusting output voltage level or by adjusting OVP trip level The following steps show you how to cl...

Page 55: ...pped 2 Select the OVP CLEAR mode by turning the knob 3 Clear the overvoltage condition and exit this menu The annunciator for OVP operation will not flash any more The output will return to the meter...

Page 56: ...the overvoltage condition occurs If external voltage source such as a battery is connected across the output and the overvoltage condition inadvertently occurs the SCR will continuously sink a large...

Page 57: ...hing digit disappears To see or check the changes while the output is disabled press before returning to meter mode Front panel operation output Off Remote interface operation OUTP OFF ON Disconnectin...

Page 58: ...output on off state OVP on off state and trip levels Whenshippedfromthefactory storagelocations 1 through 5 areempty You can assign a name to the storage locations You can name a location from the fr...

Page 59: ...ely 2 seconds to execute If all tests pass you can have a high confidence that the power supply is operational If the complete self test is successful PASS is displayed on the front panel If the self...

Page 60: ...d the system firmware revision numbers Remote interface operation IDN The above command returns a string in the form Agilent Technologies E3646A 0 X X Y Y Z Z E3646A Be sure to dimension a string vari...

Page 61: ...is stored in non volatile memory and does not change when power has been off or after a power on reset RST command Your computer s GPIB interface card has its own address Besure to avoid using the com...

Page 62: ...n page 97 RS 232 Configuration Overview Configure the RS 232 interface using the parameters shown below Use the front panel key to select the baud rate parity and number of data bits See page 48 for m...

Page 63: ...ble for your configuration you may have to use a wiring adapter If you are using a DTE to DTE cable make sure the adapterisa straight through type Typicaladaptersincludegenderchangers null modem adapt...

Page 64: ...that your computer is set up for 1 start bit and 2 stop bits these values are fixed on the power supply Make sure to execute the SYSTem REMote command to place the power supply in the remote mode Ver...

Page 65: ...e is stored in non volatile memory and does not change when power has been off or after a power on reset RST command The security code may contain up to 11 alphanumeric characters or underscore charac...

Page 66: ...nter the security code Enter the security code using the control knob and resolution selection keys 3 Save the change and exit the menu You will see the above message if the security code is correct A...

Page 67: ...n Calibrate keyandholddownthe key until you hear a long beep And a message CAL MODE is displayed 2 Enter the security code Enterthedesiredsecuritycodeusingthecontrolknobandresolutionselection keys 3 S...

Page 68: ...nsecure thepower supplyusingthe old security code Then enter the new code as shown below CAL SEC STAT OFF 003646 Unsecure with old code CAL SEC CODE ZZ001443 Enter new code CAL SEC STAT ON ZZ001443 Se...

Page 69: ...the remote interface You can read the calibration message whether the powers supply is secured or unsecured The calibration message may contain up to 40 characters From the front panel you can view 11...

Page 70: ...4 Remote Interface Reference...

Page 71: ...ds starting on page 94 Interface Configuration Commands on page 97 The SCPI Status Registers starting on page 98 Status Reporting Commands starting on page 108 An Introduction to the SCPI Language sta...

Page 72: ...ctions in this chapter for morecomplete details on each command Throughout this manual the following conventions are used for SCPI command syntax Square brackets indicate optional keywords or paramete...

Page 73: ...Mediate AMPLitude MIN MAX VOLTage LEVel IMMediate STEP INCRement numeric value DEFault VOLTage LEVel IMMediate STEP INCRement DEFault VOLTage LEVel TRIGgered AMPLitude voltage MIN MAX VOLTage LEVel TR...

Page 74: ...seconds MIN MAX DELay MIN MAX SOURce BUS IMM SOURce TRG see page 90 for more information DISPlay WINDow STATe OFF ON STATe MODE VV VI II MODE TEXT DATA quoted string TEXT DATA TEXT CLEar SYSTem BEEPer...

Page 75: ...ON quoted code SECure STATe STRing quoted string STRing VOLTage DATA numeric value VOLTage LEVel MIN MID MAX VOLTage PROTection see page 97 for more information SYSTem INTerface GPIB RS232 LOCal REMo...

Page 76: ...re information STATus QUEStionable EVENt ENABle enable value ENABle INSTrument EVENt ENABle enable value ENABle ISUMmary n EVENt CONDition ENABle enable value ENABle SYSTem ERRor CLS ESE enable value...

Page 77: ...face Reference SCPI Command Summary 76 see page 120 for more information CLS ESR ESE enable value ESE IDN OPC OPC PSC 0 1 PSC RST SAV 1 2 3 4 5 RCL 1 2 3 4 5 STB SRE enable value SRE TRG TST WAI IEEE...

Page 78: ...r for details on outputting command strings and entering data Using the APPLy Command The APPLy command provides the most straightforward method to program the power supply over the remote interface F...

Page 79: ...ue bus enter statement Enter error string into computer print statement Print error string Selecting a Trigger Source The power supply will accept a bus software trigger or an immediate internal trigg...

Page 80: ...A E3649A 0 8V 3A Range 0 20V 1 5A Range 0 35V 0 8A Range 0 60V 0 5A Range 0 8V 5A Range 0 20V 2 5A Range 0 35V 1 4A Range 0 60V 0 8A Range Voltage Programming Range 0 V to 8 24 V 0 V to 20 60 V 0 V to...

Page 81: ...alid within the presently selected range An execution error will occur if the programmed values are not valid within the selected range You can substitute MINimum MAXimum or DEFault in place of a spec...

Page 82: ...ediate current level using the UP or DOWN parameter by a predetermined amount The command CURRent STEP sets the amount of increase or decrease Notice that a new increment setting will cause an executi...

Page 83: ...ousetheCURR UP orCURR DOWN command to increase or decrease the output current with the CURR STEP command CURR STEP 0 01 Set the step size to 0 01 A CURR UP Increase the output current CURR STEP 0 02 S...

Page 84: ...o node follows the couple command TRIGger subsystem is assumed to be coupled The parameter indicates to which logical outputs the specified coupling is to apply Alistofoutputsspecifiesaparticularsetof...

Page 85: ...ing mode state of the power supply The returned value is 0 OFF or 1 ON VOLTage voltage MINimum MAXimum UP DOWN Programtheimmediatevoltagelevelofthepowersupply Theimmediatelevel is the voltage value of...

Page 86: ...ze currently specified The returned parameter is a numeric value DEFault gives theminimum resolution step size in unit of volts Example ThefollowingprogramsegmentsshowhowtousetheVOLT UP orVOLT DOWN co...

Page 87: ...1 if the overvoltage protection circuit is tripped and not cleared or a 0 if not tripped VOLTage PROTection CLEar Cause the overvoltage protection circuit to be cleared After this command theoutputvol...

Page 88: ...put is set to the triggered level immediately But if the trigger source is the bus the power supply is set to thetriggeredlevelafterreceivingtheGroupExecuteTrigger GET or TRG command Trigger Source Ch...

Page 89: ...UR BUS TRG WAI TRG WAI You can use the OPC operation complete query command or the OPC operation complete command to signal when the operation is complete The OPC command returns 1 to the output buffe...

Page 90: ...MIN 0 seconds MAX 3600 seconds At RST this value is set to 0 seconds TRIGger DELay MINimum MAXimum Query the trigger delay TRIGger SOURce BUS IMMediate Selectthesourcefromwhichthepowersupplywillaccept...

Page 91: ...e V I display mode DISPlay MODE Query the state of the display mode Returns a string VV II or VI DISPlay Query the front panel display setting Returns 0 OFF or 1 ON DISPlay TEXT quoted string Display...

Page 92: ...errorthatwasstored Whenyouhave readallerrorsfrom thequeue theERROR annunciatorturnsoffandtheerrors are cleared See Error Messages starting on page 121 for more details SYSTem VERSion Query the power s...

Page 93: ...hows thestate of the power supply after a RESET from the Recall menu or RST command from the remote interface Note The voltage and current step sizes listed above are typical value Command E3646A stat...

Page 94: ...ed in the specified storage location When shipped from the factory storage locations 1 through 5 are empty Note DISP OFF ON can be stored and recalled in remote interface mode only Going to local mode...

Page 95: ...the output state is ON It enters a current value that you obtained by reading an external meter You must first select the minimum calibration level CAL CURR LEV MIN for the value being entered then se...

Page 96: ...st select the minimum calibration level CAL VOLT LEV MIN for the value being entered You must then select the middle and maximumcalibrationlevels CAL VOLT LEV MID andCAL VOLT LEV MAX for the value bei...

Page 97: ...er the reading you obtained from the DVM CAL VOLT DATA 11 058 9 Set the power supply to high MAX calibration point CAL VOLT LEV MAX 10 Enter the reading you obtained from the DVM CAL VOLT DATA 21 566...

Page 98: ...the remote mode for RS 232 operation All keys on thefrontpanel exceptthe Local key aredisabledwhilein theremotemode SYSTem RWLock Place the power supply in the remote mode for RS 232 operation This c...

Page 99: ...CLS clearstatus command A reset RST or device clear will not clear bits inevent registers Querying an event registerreturnsadecimalvaluewhichcorrespondstothebinary weightedsum of all bits set in the...

Page 100: ...nt 0 1 OR Not Used Not Used Not Used Not Used Not Used Not Used Not Used Overvoltage Not Used Not Used Not Used Not Used Not Used Not Used 9 STATus QUEStionable INSTrument ISUMmary2 Event Registers En...

Page 101: ...d Not Used Not Used Not Used Not Used ISUM Not Used Not Used Not Used 13 OR OPC Not Used QYE DDE EXE CME PON Not Used 5 OR Not Used Not Used Not Used Standard Event Event Register Enable Registers Ope...

Page 102: ...to enable the Questionable Instrument Summary register where n is 1 or 2 Table 4 3 Bit Definitions Questionable Status Register The Questionable Instrument Status Register TheQuestionableInstrumentre...

Page 103: ...send the command STAT QUES INST ISUM n where n is 1 or 2 To determine the operating mode CV or CC for the power supply send STAT QUES INST ISUM n COND where n is 1 or 2 depending on the output Bit 1...

Page 104: ...more errors in the power supply s error queue Read the error queue using the SYST ERR command Bit Decimal Value Definition 0 OPC 1 Operation Complete All commands prior to and including an OPC comman...

Page 105: ...ister reports conditions from the other status registers Query data that is waiting in the power supply s output buffer is immediatelyreportedthroughthe MessageAvailable bit bit4 ofStatusByte register...

Page 106: ...enbit6 requestservice issetintheStatus Byte an IEEE 488 service request interrupt message is automatically sent to thebuscontroller Thebuscontrollermaythenpolltheinstrumentsonthebus to identify which...

Page 107: ...yte summary register Using the Message Available Bit MAV You can use the Status Byte message available bit bit 4 to determine when data is available to read into your bus controller The power supply s...

Page 108: ...t bit 0 is set in the Standard Event register 6 Use aserialpolltochecktosee whenbit5 standard event issetin the Status Byte summary register You could also configure the power supply for an SRQ interr...

Page 109: ...ble Status Enable register The selected bits are then reported to the Status Byte STATus QUEStionable ENABle Query the Questionable Status Enable register The power supply returns a binary weighted de...

Page 110: ...EStionable INSTrument ISUMmary n ENABle enable value Set the value of the Questionable Instrument Isummary Enable register for a specificoutputofthetwo outputpowersupply Theparticularoutputmustbe spec...

Page 111: ...emasks are not cleared when power is turned on PSC Query the power on status clear setting The returned parameter is 0 PSC 0 or 1 PSC 1 SRE enable value Enable bits in the Status Byte enable register...

Page 112: ...ed on a hierarchical structure also known as a tree system In this system associated commands are grouped together under a common node or root thus forming subsystems A portion of the SOURce subsystem...

Page 113: ...glebrackets indicatethatyoumustspecifyavaluefortheenclosed parameter For example the above syntax statement shows the current parameter enclosed in triangle brackets The brackets are not sent with the...

Page 114: ...he following two commands SOUR VOLT MIN SOUR CURR MAX Useacolonandasemicolontolinkcommandsfromdifferentsubsystems For example in the following command string an error is generated if you do not use th...

Page 115: ...uation send a device clear before sending the second query command SCPI Command Terminators Acommandstringsenttothepowersupplymustterminatewitha new line character The IEEE 488 EOI end or identify mes...

Page 116: ...Parameters Discreteparametersareusedtoprogramsettingsthat havea limited number of values like BUS IMM Queryresponses will always return the short form in all upper case letters The following command...

Page 117: ...shows how to send a device clear over the GPIB interface using Agilent BASIC CLEAR 705 IEEE 488 Device Clear The following statement shows how to send a device clear over the GPIB interface using the...

Page 118: ...fthesenon documented commands duplicate the functionality of a command already described in this manual SCPI Confirmed Commands The following table lists the SCPI confirmed commands that are used by t...

Page 119: ...tage MIN MAX VOLTage LEVel TRIGgered AMPLitude MIN MAX VOLTage PROTection LEVel voltage MIN MAX VOLTage PROTection LEVel MIN MAX VOLTage PROTection STATe 0 1 OFF ON VOLTage PROTection STATe VOLTage PR...

Page 120: ...follow all of the command syntax rules defined by the standard Non SCPI Commands APPLy voltage DEF MIN MAX current DEF MIN MAX APPLy CALibration COUNt CURRent DATA numeric value CURRent LEVel MIN MID...

Page 121: ...ote Enable SRQ Service Request Enable Addressed Commands DCL Device Clear EOI End or Identify GET Group Execute Trigger GTL Go To Local LLO Local Lockout SDC Selected Device Clear SPD Serial Poll Disa...

Page 122: ...5 Error Messages...

Page 123: ...ORS from the front panel Theerrorqueueisclearedbythe CLS clearstatus commandorwhenpower is cycled The errors are also cleared when you read the queue Notethatthe RST resetcommand commanddoesnotclearth...

Page 124: ...stead of a colon semicolon or blank space or you may have used a blank space instead of a comma Example TRIG SOUR BUS or APPL 1 0 1 0 104 Data type error The wrong parameter type was found in the comm...

Page 125: ...1010102 123 Numeric overflow A numeric parameter was found whose exponent was larger than 32 000 124 Too many digits A numeric parameter was found whose mantissa contained more than 255 digits excludi...

Page 126: ...or double quotes Example DISP TEXT ON 158 String data not allowed A character string was received but is not allowed for the command Check the list of parameters to verify that you have used a valid...

Page 127: ...invalid parameter choice Example DISP STAT XYZ XYZ is not a valid choice 330 Self test failed Thepowersupply scompleteself testfailedfromtheremoteinterface TST command In addition to this error more s...

Page 128: ...buffer is also full Command execution continues but all data is lost 440 Query UNTERMINATED after indefinite response The IDN command must be the last query command within a command string Example ID...

Page 129: ...tputs if the track mode is already enabled Tracking mode should be disabled first when coupling the outputs 801 Outputs coupled by trigger subsystem This error occurs when enabling the track mode if t...

Page 130: ...602 RAM read write failed 603 A D sync stuck 604 A D slope convergence failed 605 Cannot calibrate rundown gain 606 Rundown gain out of range 607 Rundown too noisy 608 Serial configuration readback f...

Page 131: ...the same security code to unsecure the power supply as was used to secure it and vice versa The security code may contain up to 11 alphanumeric characters 704 Secure code too long A security code was...

Page 132: ...t set overvoltage to OFF before and during the calibration 718 Gain out of range for Gain Error Correction The slope of the DAC gain is out of range Hardware fails 740 Cal checksum failed secure state...

Page 133: ...Chapter 5 Error Messages Calibration Errors 132...

Page 134: ...6 Application Programs...

Page 135: ...tedonaPCrunningWindows 3 1 Windows 95 or Windows NT 4 0 The examples are written for use over GPIB IEEE488 orRS 232 ButtheexamplesforuseovertheRS 232interface do not work with Windows 3 1 These exampl...

Page 136: ...se are usually found in the c vxipnp win win95 or winnt lib msc or c vxipnp win win95 or winnt include directory Diode c Diode C This example program steps the power supply through 11 voltages and mea...

Page 137: ...Unable to set voltage Measure output current ErrorStatus viPrintf power_supply Measure Current n CheckError Unable to write device delay 500 Allow output to wait for 500 msec Retrieve reading ErrorSta...

Page 138: ...aultRM defaultRM ErrorStatus viOpen defaultRM VISA_address 0 0 power_supply CheckError Unable to open port if bGPIB SendSCPI System Remote void SendSCPI char pString char pdest strcpy commandString pS...

Page 139: ...n Programs Example Program for C and C 138 void CheckError char pMessage if ErrorStatus VI_SUCCESS printf n s pMessage ClosePort exit 0 void delay clock_t wait clock_t goal goal wait clock while goal...

Page 140: ...rd the response on the worksheet The example on the following pages characterizes a component across the terminals of the power supply This example reads 11 voltages from a worksheet programs the powe...

Page 141: ...to theInsertmenu choose Module The Module window appears Then type the text as shown starting on page 141 This module will configure all of the overhead required to communicate with the power supply o...

Page 142: ...Contents Dim I As Integer bGPIB True To use RS 232 set the bGPIB to False OpenPort SendSCPI RST Set power on condition SendSCPI Output on Turn on the output For I 5 To 15 SendSCPI Volt Str Cells I 1 C...

Page 143: ...tatus viWrite power_supply ByVal commandString Len commandString _ actual CheckError Can t Write to Device If bGPIB False Then delay 0 5 End If If InStr commandString Then ErrorStatus viRead power_sup...

Page 144: ...ad Lib VISA DLL Alias 256 ByVal vi As Long ByVal Buffer As String ByVal count As Long retCount As Long As Long Declare Function viWrite Lib VISA DLL Alias 257 ByVal vi As Long ByVal Buffer As String B...

Page 145: ...Chapter 6 Application Programs Example Program for Excel 97 144...

Page 146: ...7 Tutorial...

Page 147: ...ation to help you better understand output characteristics of this power supply as well as an ideal power supply This chapter is divided into the following sections Overview of this Power Supply Opera...

Page 148: ...oltage Becausethevariableresistance ofFigure7 1is actuallyoneor more power transistor operating in the linear class A mode supplies with this type of regulator are often called linear power supplies L...

Page 149: ...ersupplycontains alinearregulatedpowersupply Itiscontrolledby a control circuit that provides voltages to program the outputs The power supply sends back to the control circuits a voltage representing...

Page 150: ...rrent Power Supply Power Supply Theidealconstant currentpowersupplyexhibitsaninfiniteoutputimpedance at all frequencies Thus as Figure 7 4 indicates the ideal constant current power supply would accom...

Page 151: ...1 has a relatively high resistance value compared to RC the output voltageis atthe voltagesetting andthe output currentis less than thecurrent setting In this case the power supply is in the constant...

Page 152: ...de sources of noise Normalmodevoltagenoiseisintheformofripplerelatedtothelinefrequency plus some random noise Both of these are of very low value in the power supply Careful lead layoutand keepingthe...

Page 153: ...supply output will cause a spike to appear atthe load The spike is a function of the rate of change of the load current When very rapid changes in load are expected a capacitor with alow seriesresista...

Page 154: ...o that if operated in series with other power supplies damage will not occur if the load is short circuited or if one power supply is turned on separately from its series partners When series connecti...

Page 155: ...programmed the power supply regulator circuit senses that the output is less than desired and turns on the series regulator to its maximum value IL the current limit or constant current setting This...

Page 156: ...ly Sincethecontrolcircuitcaninnowaycausethe series regulator transistors to conduct backwards the output capacitor can only be discharged through the load resistor and internal current source IS The o...

Page 157: ...Chapter 7 Tutorial Remote Programming 156...

Page 158: ...8 Specifications...

Page 159: ...ons are warranted in the temperature range of 0 to 40 C with a resistive load Supplemental characteristics which are not warranted but are descriptions of performance determined either by design or te...

Page 160: ...t 0 2 10 mA Readback Accuracy 1 12 months over GPIB and RS 232 or front panel with respect to actual output 25 C 5 C of output offset Voltage 0 05 5 mV 0 1 25mV for output 2 Current 0 15 5 mA 0 15 10m...

Page 161: ...ice versa Settling Time Lessthan90msecfortheoutputvoltagetochangefrom1 to99 orviceversa following the receipt of VOLTage or APPLy command via direct GPIB or RS 232 interface OVP Accuracy of output off...

Page 162: ...bility of output offset Following30minutes warm up changeinoutputover 8hours under constant load line and ambient temperature Voltage 0 02 2 mV Current 0 1 1 mA Output Voltage Overshoot During turn on...

Page 163: ...and the sense terminals and between the output and the sense terminals 240 Vdc when connecting insulated shorting conductors between the outputandthe senseterminalsandbetweenthe outputandthe sense ter...

Page 164: ...esigned to operate at a maximum relative humidity of 95 and at altitudes of up to 2000 meters Weight Dimensions 212 8 mmW x 133 mmH x 348 3 mmD See below and the next page for more detailed informatio...

Page 165: ...Chapter 8 Specifications Supplemental Characteristics 164 Figure 8 2 Dimensions for Rack mounting...

Page 166: ...Appendix Service Information...

Page 167: ...ESD Precautions on page 170 Surface Mount Repair on page 170 To Replace the Power Line Fuse on page 170 Troubleshooting Hints on page 171 Self Test Procedures starting on page 172 General Disassembly...

Page 168: ...y Verify that the front panel power switch has been pushed Verify that the power line fuse is installed and not open See page 20 Verify the power line voltage setting See If the Power Supply Does Not...

Page 169: ...ur failed power supply If you do not return your failed power supply within 45 days your credit card will be billed for a new power supply Ifyou choose not tosupply acreditcard number you will beasked...

Page 170: ...r repair be sure to Attach a tag to the power supply identifying the owner and indicating the required service or repair Include the instrument model number and full serial number Placethepowersupplyi...

Page 171: ...handling Keep replacement parts in original static free packaging Remove all plastic styrofoam vinyl paper and other static generating materials from the immediate work area Use only anti static sold...

Page 172: ...re that all terminal connections are removed while the self test is performed Failure of the DAC U20 on the PC board will cause many self test failures Bias Supplies Problems Check that the input to t...

Page 173: ...ns for this test to pass If this error is detected during power on self test the power supply will beep twice This error is only readable from the remote interface 602 RAM read write failed This test...

Page 174: ...ot respond This test checks that communications can beestablishedbetweenU17andU7throughtheopticallyisolated U9andU10 serial data link Failure to establish communication in either direction will genera...

Page 175: ...Appendix Service Information General Disassembly 174 General Disassembly...

Page 176: ...54602B Display transient response and ripple noise waveform RMS Voltmeter 20 Hz to 20 MHz Measure rms ripple noise Cable BNC to BNC 50 ohm 9 inch 23 Cm Agilent 10502Aor10503Aif the 10502A is not avai...

Page 177: ...e present at the outputs of the power supply Operation Verification and Performance Tests Operation Verification Tests To assure that the power supply is operating properly without testing all specifi...

Page 178: ...anel Figure A 1 Performance Verification Test Setup Current Monitoring Resistor To eliminate output current measurement error caused by the voltage drops intheleadsandconnections connectthecurrentmoni...

Page 179: ...esistor requires that switches should be used to connect disconnect and short the load resistor An electronicload ifavailable can be used in place of avariable load resistor and switches The electroni...

Page 180: ...ote interface for this test to avoid round off errors 1 Turnoffthepowersupplyandconnectadigitalvoltmeterbetweenthe and terminals of the output to be tested as shown in Figure A 1 2 Turn on the power s...

Page 181: ...mV for output2 11 Repeat steps 1 through 10 for the other output CV Load Effect Load Regulation This test measures the immediate change in the output voltage resulting from a change in the output cur...

Page 182: ...voltage range 20V 1 5A enable the output and set the display to the limit mode When the display is in the limit mode program the current to the maximum programmable value and the voltage to full rated...

Page 183: ...emonitordevice to the power supply To reduce the measurement error caused by common modenoise itisrecommended totwisttheconnectionwirebetweentheBNC receptacle and the output terminals The load resisto...

Page 184: ...ode program the current to the full scale rated value 1 5 A and the voltage to the full rated value 20 0 V 3 Checkthatthefrontpanel CV annunciatorremainslit Ifnotlit adjusttheload down slightly 4 Note...

Page 185: ...display to the limit mode When the display is in the limit mode program the current to the full scale rated value 1 5 A and the voltage to the full scale rated value 20 0 V 3 Set the electronic load...

Page 186: ...errors 1 Turn off the power supply and connect a 0 01 current monitoring resistor RM1 across theoutputto betestedand adigital voltmeteracross thecurrent monitoring resistor RM1 as shown in Figure A 1...

Page 187: ...or the other output CC Load Effect Load Regulation This test measures the immediate change in output current resulting from a change in the load from full rated output voltage to short circuit 1 Turn...

Page 188: ...c line voltage from the minimum value 10 below the nominal input voltage to the maximum value 10 above nominal voltage 1 Turn off the power supply and connect the output to be tested as shown in Figur...

Page 189: ...for the other output CC PARD Ripple and Noise Periodic and random deviations PARD in the output ripple and noise combine to produce a residual ac current as well as an ac voltage superimposedonthedcou...

Page 190: ...ut or output lines and chassis ground Common mode noise can be a problem for very sensitive circuitry that is referenced to earth ground When a circuit is referenced to earth ground a low level line r...

Page 191: ...e DVM reading E3646A 48A Output1 20 0200 V 19 9800 V Output2 20 0450 V 19 9550 V E3647A 49A Output1 60 0400 V 59 9600 V Output2 60 0850 V 59 9150 V CV Readback Accuracy Full Scale E3646A 48A Output1 D...

Page 192: ...adback Accuracy Full Scale E3646A Output1 IO 0 0095 A IO 0 0095 A Output2 IO 0 0145 A IO 0 0145 A E3647A Output1 IO 0 0062 A IO 0 0062 A Output2 IO 0 0112 A IO 0 0112 A E3648A Output1 IO 0 0125 A IO 0...

Page 193: ...adjustment provides the best long term stability To Unsecure the Power Supply Without the Security Code To unsecure the power supply without the correct security code when you forgetthesecuritycode fo...

Page 194: ...supply connectanappropriatecurrentmonitoringresistor0 01 acrosstheoutput terminals and connect a DVM across the terminals of the monitoring resistor Youcanabortacalibrationatanytimebyturningthepowersu...

Page 195: ...ibration value for eachcalibrationpointmaybepromptedtobeadjustedforyourspecificmodel 1 Turn on the calibration mode Turn on the calibration mode by holding down Calibrate key as you turn on the power...

Page 196: ...the reading you obtained from the DVM by using the knob and resolution selection keys 7 Save the changes and select the high voltage calibration point 8 Enter the reading you obtained from the DVM by...

Page 197: ...on selection keys Notice that you should wait for the DVM reading to bestabilized for accurate calibration during the current calibration 13 Save the changes and select the middle current calibration...

Page 198: ...the output1 and go to the calibration mode for the output2 If the calibration fails an error message will be displayed for one second and you will hear a beep and then go back to the current calibrati...

Page 199: ...solution selection keys Press Calibrate key to save the changes and select the OVP calibration V High voltage calibration 7 OVP1 CAL is displayed Press Calibrate key to run the overvoltage calibration...

Page 200: ...ng 705 Cal aborted 706 Cal value out of range 708 Cal output disabled 712 Bad DAC cal data 713 Bad readback cal data 714 Bad OVP cal data 717 Cal OVP status enabled 718 Gain out of range for gain erro...

Page 201: ...component locator drawings for the power supply Component Locator top for main board assembly on page 201 Component Locator bottom for main board assembly on page 202 ComponentLocator top bottom for d...

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Page 206: ...STrument COUPle TRIG ger 84 INSTrument NSELect 83 INSTrument NSELect 83 INSTrument SELect 82 INSTrument SELect 82 MEASure CURRent 84 87 MEASure VOLTage 84 OUTPut TRACk STATe 84 OUTPut TRACk STATe 84 V...

Page 207: ...ration overview 39 front panel resolution 159 fuse ratings 20 G GPIB connector 60 H halting an output 116 hierarchical structure 111 HP IB interface configuration 60 I ideal constant current power sup...

Page 208: ...27 SCPI command terminators 114 confirmed commands 117 118 conformance information 117 device specific 119 language introduction 111 non SCPI commands 119 status registers 98 version 59 117 version qu...

Page 209: ...208 Index Index...

Page 210: ...warranty or condition of merchantability fitness for a particular purpose or satisfactory quality For transactions in Austra lia and New Zealand The warranty terms contained in this statement except...

Page 211: ...l options of the above product s Complies with the essential requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC including 93 68 EEC and carries the CE Marking accordi...

Page 212: ...4433 Canada tel 877 894 4414 fax 800 746 4866 China tel 800 810 0189 fax 800 820 2816 Europe tel 31 20 547 2111 Japan tel 81 426 56 7832 fax 81 426 56 7840 Korea tel 080 769 0800 fax 080 769 0900 Lat...

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