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Agilent Technologies E3646A User Manual Download Page 58

Chapter 3 Front-Panel Operation and Features

 

Programming Overvoltage Protection

58

 

N o t e    

The power supply’s OVP circuit contains a crowbar SCR, which effectively shorts the 
output of the power supply whenever the overvoltage condition occurs. If external 
voltage source such as a battery is connected across the output, and the overvoltage 
condition inadvertently occurs, the SCR will continuously sink a large current from 
the source; possibly damaging the power supply. To avoid this a diode must be 
connected in series with the output as shown in Figure 3-1.

Figure 3-1. Recommended Protection Circuit for Battery Charging

Summary of Contents for E3646A

Page 1: ...Number E3646 90001 May 2011 For Warranty information refer to the back of the manual Copyright Agilent Technologies Inc 2000 2011 All Rights Reserved Agilent E364xA Dual Output DC Power Supplies Agil...

Page 2: ...2...

Page 3: ...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 4: ...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 5: ...rrent 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 clockwise 1...

Page 6: ...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 7: ...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 8: ...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 9: ...sages that may appear as you are workingwiththepowersupply Eachlistingcontainsinformationtohelpyoudiagnose and solve the problem Application Programs Chapter 6 contains some remote interface applicati...

Page 10: ...ll 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 accord...

Page 11: ...31 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 12: ...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 13: ...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 14: ...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 15: ...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 16: ...16 Contents Contents...

Page 17: ...1 Quick Start...

Page 18: ...his chapter 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 c...

Page 19: ...supply If the power supply does not turn on properly see page 22 3 Perform a complete self test The complete self test performs a more extensive set of tests than those performed at power on Hold dow...

Page 20: ...ed 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...

Page 21: ...1 0 volt to assure CC operation The CC 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 t...

Page 22: ...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 supply is shipped from the factory Change the voltage setting if...

Page 23: ...and the power line fuse on the rear panel 1 Remove AC line power 2 Remove the cover Refer to General Disassembly on page 178 3 Set two sections of the line voltage selector switch on the PC board for...

Page 24: ...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 25: ...g 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 26: ...Instrument 26 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 27: ...2 General Information...

Page 28: ...upply This chapter also provides instructions for installation of your power supply and the output connections Unless otherwise stated the information in this manual applies to all the four models Thi...

Page 29: ...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 30: ...ack 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 m...

Page 31: ...for user defined 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...

Page 32: ...g 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 availabl...

Page 33: ...Verify that the 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 ac...

Page 34: ...to AWG 14 Note When making load connections from the rear output terminals four load wire connection is recommended to keep good CV load regulation if carrying full rated current of the power supply C...

Page 35: ...reasing the size of the capacitive load A large load capacitor may cause the power supply to cross into CC or unregulated mode momentarily when the output voltage is reprogrammed The slew rate of the...

Page 36: ...ote voltage sensing is used to maintain regulation at the load and reduce the degradation ofregulationthatwould occurdueto the voltagedrop in theleadsbetween the power supply and the load When the pow...

Page 37: ...y When remote sensing add 5 mV to this specification for each 1 V drop between the positive sensing point and output terminal due to the change in load current Because the sense leads are part of the...

Page 38: ...the power supply Each pair of wires should be as short as possible and twisted or bundled to reduce lead inductance and noise pick up If a shield is used connect one end to the power supply ground te...

Page 39: ...3 Front Panel Operation and Features...

Page 40: ...ion starting on page 42 Constant Current Operation starting on page 44 Tracking Operation starting on page 46 View Menu Operation starting on page 47 Configuring the Remote Interface starting on page...

Page 41: ...ode you can 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...

Page 42: ...lay to the limit mode Notice that the Limit annunciator flashes indicating that the display is in the limit mode When the display is in the limit mode you can see the voltage and current limit values...

Page 43: ...e that the display is in the meter mode 8 Verify that the power supply is in the constant voltage mode If you operate the power supply in the constant voltage CV mode verify that the CV annunciator is...

Page 44: ...play to the limit mode Notice that the Limit annunciator flashes indicating that the display is in the limit mode When the display is in the limit mode you can see the voltage and current limit values...

Page 45: ...e thatthe display is in the meter mode 8 Verify that the power supply is in the constant current mode If you operate the power supply in the constant current CC mode verify that the CC annunciator is...

Page 46: ...down key until the Track annunciator turns on For example 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...

Page 47: ...ys or the front panel display will automatically return to the normal display to allow you to change the limit values After the displaymode isset to V V orI Idisplay mode all the annunciatorsremain un...

Page 48: ...xt on the display 3 Clear the errors and exit the menu All errors are cleared when you exit the menu by pressing key or let the display time out for about 30 seconds See Error Messages for more inform...

Page 49: ...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 50: ...ed for 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 Configurati...

Page 51: ...he RS 232 interface by turning the knob 3 Select the baud rate Select one of the following 300 600 1200 2400 4800 or 9600 factory setting baud 4 Select the parity and number of stop bits Select one of...

Page 52: ...enu by turning the 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 volt...

Page 53: ...call mode Memory location 1 will be displayed in the recall mode 2 Select the stored operating state You can select the above RESET mode to reset the power supply to the power on state without turning...

Page 54: ...Storing and Recalling Operating States 54 SAV 1 2 3 4 5 Store an operating state to a specified location RCL 1 2 3 4 5 Recall a previously stored state from a specified location MEM STATE NAME 1 P15V_...

Page 55: ...d how to clear 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...

Page 56: ...n 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 cle...

Page 57: ...ipped 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 58: ...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 c...

Page 59: ...e flashing 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 Discon...

Page 60: ...ut on off state OVP on off state and trip levels When shipped from the factory storage locations 1 through 5 are empty You can assign a name to the storage locations You can name a location from the f...

Page 61: ...mately 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 se...

Page 62: ...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 variab...

Page 63: ...s 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 Be sure to avoid using the com...

Page 64: ...e 101 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 50 for more...

Page 65: ...for your configuration you may have to use a wiring adapter If you are using a DTE to DTE cable make sure the adapter is a straight through type Typical adapters include gender changers null modem ad...

Page 66: ...ts Make sure 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 rem...

Page 67: ...ty code 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...

Page 68: ...2 Enter 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 correc...

Page 69: ...y holding down Calibrate key and hold down the key until you hear a long beep And a message CAL MODE is displayed 2 Enter the security code Enter the desired security code using the control knob and r...

Page 70: ...the power supply using the 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 Secure...

Page 71: ...e 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 c...

Page 72: ...Chapter 3 Front Panel Operation and Features Calibration Overview 72...

Page 73: ...4 Remote Interface Reference...

Page 74: ...ands starting on page 98 Interface Configuration Commands on page 101 The SCPI Status Registers starting on page 102 Status Reporting Commands starting on page 112 An Introduction to the SCPI Language...

Page 75: ...ctions in this chapter for more complete details on each command Throughout this manual the following conventions are used for SCPI command syntax Square brackets indicate optional keywords or paramet...

Page 76: ...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 77: ...seconds MIN MAX DELay MIN MAX SOURce BUS IMM SOURce TRG see page 94 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 78: ...ON quoted code SECure STATe STRing quoted string STRing VOLTage DATA numeric value VOLTage LEVel MIN MID MAX VOLTage PROTection see page 101 for more information SYSTem INTerface GPIB RS232 LOCal REMo...

Page 79: ...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 80: ...face Reference SCPI Command Summary 80 see page 124 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 81: ...details on outputting command strings and entering data Using the APPLy Command The APPLy command provides the most straightforward method to program the power supply over the remote interface For exa...

Page 82: ...queue bus enter statement Enter error string into computer print statement Print error string Selecting a Trigger Source The power supply will accept a bus software trigger or an immediate internal t...

Page 83: ...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 84: ...lid 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 speci...

Page 85: ...immediatecurrentlevelusingthe 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 executio...

Page 86: ...0 01 Set the step size to 0 01 A CURR UP Increase the output current CURR STEP 0 02 Set the step size to 0 02 A CURR DOWN Decrease the output current INSTrument SELect OUTPut1 OUTPut2 OUT1 OUT2 Select...

Page 87: ...ts to be coupled At RST all outputs are uncoupled Example The following program segment shows how to use the INSTrument COUPle command to couple two outputs with voltage and current triggered levels T...

Page 88: ...mum UP DOWN Program the immediate voltage level of the power supply The immediate level is the voltage value of the output terminals The VOLTage command changes the output of the power supply to the n...

Page 89: ...rently specified The returned parameter is a numeric value DEFault gives the minimum resolution step size in unit of volts Example The following program segments show how to use the VOLT UP or VOLT DO...

Page 90: ...f 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 the output volt...

Page 91: ...is set to the triggered level immediately But if the triggersourceisthebus thepowersupply issettothetriggeredlevelafter receiving the Group Execute Trigger GET or TRG command Trigger Source Choices Y...

Page 92: ...d TRIG SOUR 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 out...

Page 93: ...nds MAX 3600 seconds At RST this value is set to 0 seconds TRIGger DELay MINimum MAXimum Query the trigger delay TRIGger SOURce BUS IMMediate Select the source from which the power supply will accept...

Page 94: ...is set to the 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 str...

Page 95: ...or Messages starting on page 125 for more details SYSTem VERSion Query the power supply to determine the present SCPI version The returned value is of a string in the form YYYY V where the Y s represe...

Page 96: ...The voltage and current step sizes listed above are typical value Command E3646A state E3647A state E3648A state E3649A state CURR 3 A 0 8 A 5 A 1 4 A CURR STEP 0 052 mA 0 014 mA 0 095 mA 0 027 mA CUR...

Page 97: ...state stored 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...

Page 98: ...ed and the output state is ON It enters a current value that you obtained by reading an external meter You must first selecttheminimumcalibrationlevel CAL CURR LEV MIN for the value being entered then...

Page 99: ...the minimum calibration level CAL VOLT LEV MIN for the value being entered You must then select the middle and maximum calibration levels CAL VOLT LEV MID and CAL VOLT LEV MAX for the value being ent...

Page 100: ...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 11...

Page 101: ...the remote mode for RS 232 operation All keys on the front panel except the Local key are disabled while in the remote mode SYSTem RWLock Place the power supply in the remote mode for RS 232 operation...

Page 102: ...s command A reset RST or device clear will not clear bits in event registers Querying an event register returns a decimal value which corresponds to the binary weighted sum of all bits set in the regi...

Page 103: ...rent 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...

Page 104: ...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 105: ...e the Questionable Instrument Summary register where n is 1 or 2 Table 4 3 Bit Definitions Questionable Status Register The Questionable Instrument Status Register The Questionable Instrument register...

Page 106: ...upply 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 B...

Page 107: ...rd one or 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 O...

Page 108: ...rts conditions from the other status registers Query data that is waiting in the power supply s output buffer is immediately reported throughthe MessageAvailable bit bit4 ofStatusByteregister Bitsinth...

Page 109: ...n bit 6 request service is set in the Status Byte an IEEE 488 service request interrupt message is automatically sent to the bus controller The bus controller may then poll the instruments on the bus...

Page 110: ...s Byte summary register Using the Message Available Bit MAV You can use the Status Byte message available bit bit 4 to determine when data is available to read into your bus controller The power suppl...

Page 111: ...0 is set in the Standard Event register 6 Use a serial poll to check to see when bit 5 standard event is set in the Status Byte summary register You could also configure the power supply for an SRQ i...

Page 112: ...n the Questionable 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 bin...

Page 113: ...ument ISUMmary n ENABle enable value Set the value of the Questionable Instrument Isummary Enable register for a specific output of the two output power supply The particular output must be specified...

Page 114: ...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 SRE Qu...

Page 115: ...ased 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 subsyst...

Page 116: ...ackets indicate that you must specify a value for the enclosed parameter For example the above syntax statement shows the current parameter enclosed in triangle brackets The brackets are not sent with...

Page 117: ...ing the following two commands SOUR VOLT MIN SOUR CURR MAX Use a colon and a semicolon to link commands from different subsystems For example in the following command string an error is generated if y...

Page 118: ...e clear before sending the second query command SCPI Command Terminators A command string sent to the power supply must terminate with a new line character The IEEE 488 EOI end or identify message is...

Page 119: ...ameters Discrete parameters are used to program settings that have a limited number of values like BUS IMM Query responses will always return the short form in all upper case letters The following com...

Page 120: ...ement 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 usin...

Page 121: ...ty Most of these non 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 ar...

Page 122: ...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 123: ...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 124: ...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 125: ...5 Error Messages...

Page 126: ...el The error queue is cleared by the CLS clear status command or when power is cycled The errors are also cleared when you read the queue Note that the RST reset command command does not clear the err...

Page 127: ...f 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 command str...

Page 128: ...lue Example ESE B01010102 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...

Page 129: ...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 130: ...meter choice Example DISP STAT XYZ XYZ is not a valid choice 330 Self test failed The power supply s complete self test failed from the remote interface TST command In addition to this error more spec...

Page 131: ...fer 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 IDN SY...

Page 132: ...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 133: ...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 134: ...he 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 r...

Page 135: ...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 136: ...Chapter 5 Error Messages Calibration Errors 136...

Page 137: ...6 Application Programs...

Page 138: ...running Windows 3 1 Windows 95 or Windows NT 4 0 The examples are written for use over GPIB IEEE 488 or RS 232 But the examples for use over the RS 232 interface do not work with Windows 3 1 These ex...

Page 139: ...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 140: ...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 141: ...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 142: ...n Programs Example Program for C and C 142 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 143: ...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 power...

Page 144: ...95 NT go to the Insert menu 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 po...

Page 145: ...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 146: ...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 147: ...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 148: ...Chapter 6 Application Programs Example Program for Excel 97 148...

Page 149: ...7 Tutorial...

Page 150: ...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 151: ...tage Because the variable resistance of Figure 7 1 is actually one or more power transistor operating in the linear class A mode supplies with this type of regulator are often called linear power supp...

Page 152: ...ply contains a linear regulated power supply It is controlled by a control circuit that provides voltages to program the outputs The power supply sends back to the control circuits a voltage represent...

Page 153: ...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 a...

Page 154: ...nt 1 has a relatively high resistance value compared to RC the output voltage is at the voltage setting and the output current is less than the current setting In this case the power supply is in the...

Page 155: ...noise Normal mode voltage noise is in the form of ripple related to the line frequency plus some random noise Both of these are of very low value in the power supply Careful lead layout and keeping th...

Page 156: ...y output will cause a spike to appear at the load The spike is a function of the rate of change of the load current When very rapid changes in load are expected a capacitor with a low series resistanc...

Page 157: ...erminals so that if operated in series with other power supplies damage will not occur if the load is short circuited or if one power supply is turned on separately from its series partners When serie...

Page 158: ...is programmed the power supply regulator circuit senses that the output is less than desired and turns on the series regulator to its maximum value IL the current limit or constant current setting Thi...

Page 159: ...he control circuit can in no way cause the series regulator transistors to conduct backwards the output capacitor can only be discharged through the load resistor and internal current source IS The ou...

Page 160: ...Chapter 7 Tutorial Remote Programming 160...

Page 161: ...8 Specifications...

Page 162: ...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 163: ...t 2 Current 0 2 10 mA Readback Accuracy 1 12 months over GPIB and 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 10mA for output...

Page 164: ...from 1 to 99 or vice versa following the receipt of VOLTage or APPLy command via direct GPIB or RS 232 interface OVP Accuracy of output offset 0 5 0 5 V Activation time Average time for output to sta...

Page 165: ...bility of output offset Following 30 minutes warm up change in output over 8 hours under constant load line and ambient temperature Voltage 0 02 2 mV Current 0 1 1 mA Output Voltage Overshoot During t...

Page 166: ...and the sense terminals and between the output and the sense terminals 240 Vdc when connecting insulated shorting conductors between the output and the sense terminals and between the output and the...

Page 167: ...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 168: ...Chapter 8 Specifications Supplemental Characteristics 168 Figure 8 2 Dimensions for Rack mounting...

Page 169: ...Appendix Service Information...

Page 170: ...ESD Precautions on page 174 Surface Mount Repair on page 174 To Replace the Power Line Fuse on page 174 Troubleshooting Hints on page 175 Self Test Procedures starting on page 176 General Disassembly...

Page 171: ...y Verify that the front panel power switch has been pushed Verify that the power line fuse is installed and not open See page 22 Verify the power line voltage setting See If the Power Supply Does Not...

Page 172: ...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 If you choose not to supply a credit card number you will be...

Page 173: ...air 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 Place the power supply in...

Page 174: ...ling 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 solder su...

Page 175: ...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 the volt...

Page 176: ...is 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 writes an...

Page 177: ...t respond This test checks that communications can be established between U17 and U7 through the optically isolated U9 and U10 serial data link Failure to establish communication in either direction w...

Page 178: ...Appendix Service Information General Disassembly 178 General Disassembly...

Page 179: ...ilent 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 Agilent10502Aor10503Aif the 10502A is not...

Page 180: ...ges may be 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 al...

Page 181: ...panel Figure A 1 Performance Verification Test Setup Current Monitoring Resistor To eliminate output current measurement error caused by the voltage drops in the leads and connections connect the curr...

Page 182: ...esistor requires that switches should be used to connect disconnect and short the load resistor An electronic load ifavailable canbeusedinplaceofavariableloadresistorandswitches Theelectronic load is...

Page 183: ...face for this test to avoid round off errors 1 Turn off the power supply and connect a digital voltmeter between the and terminals of the output to be tested as shown in Figure A 1 2 Turn on the power...

Page 184: ...t2 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 current from ful...

Page 185: ...the high voltage range 20V 1 5A enabletheoutput andsetthedisplayto thelimitmode Whenthedisplay is in the limit mode program the current to the maximum programmable value and the voltage to full rated...

Page 186: ...e monitor device to the power supply To reduce the measurement error caused by common mode noise it is recommended to twist the connection wire between the BNC receptacle and the output terminals The...

Page 187: ...e current to the full scale rated value 1 5 A and the voltage to the full rated value 20 0 V 3 Check that the front panel CV annunciator remains lit If not lit adjust the load down slightly 4 Note tha...

Page 188: ...thelimitmode Whenthedisplay 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 to transient op...

Page 189: ...errors 1 Turn off the power supply and connect a 0 01 current monitoring resistor RM1 across the output to be tested and a digital voltmeter across the current monitoring resistor RM1 as shown in Figu...

Page 190: ...h 10 for 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...

Page 191: ...ine 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 Figure A...

Page 192: ...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 superimposed on the dc output CC PA...

Page 193: ...the output 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 leve...

Page 194: ...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 195: ...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 196: ...s 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 forget the security code follow the steps...

Page 197: ...ct an appropriate current monitoring resistor 0 01 across the output terminals and connect a DVM across the terminals of the monitoring resistor You can abort a calibration at any time by turning the...

Page 198: ...bration value for each calibration point may be prompted to be adjusted for your specific model 1 Turn on the calibration mode Turn on the calibration mode by holding down Calibrate key as you turn on...

Page 199: ...ter 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...

Page 200: ...ution selection keys Notice that you should wait for the DVM reading to be stabilized for accurate calibration during the current calibration 13 Save the changes and select the middle current calibrat...

Page 201: ...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 202: ...esolution 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 calibratio...

Page 203: ...oo long 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...

Page 204: ...omponent 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 Component Locator top bottom for d...

Page 205: ...STATe 86 VOLTage PROTection STATe 86 VOLTage PROTec tion TRIPped 86 VOLTage PROTection 86 VOLTage RANGe 86 VOLTage RANGe 86 VOLTage STEP 85 VOLTage STEP 85 VOLTage TRIGgered 85 VOLTage TRIGgered 85 VO...

Page 206: ...tion STATe 90 VOLTage PROTection TRIPped 90 VOLTage PROTection 90 VOLTage RANGe 90 VOLTage RANGe 90 VOLTage STEP 89 VOLTage STEP 89 VOLTage TRIGgered 89 VOLTage TRIGgered 89 VOLTage 88 commands state...

Page 207: ...t 65 null modem adapters 65 RS 232 cable 30 wiring adapter 65 K key descriptions front panel 5 keyword s lower level 115 root 115 second level 115 third level 115 knob locking 59 L limit mode 41 42 li...

Page 208: ...te 19 61 power on 61 to perform 61 semicolon 117 series element 151 series operation connection 157 series regulated supply 151 series resistance 151 service request SRQ interrupt 109 settling time 16...

Page 209: ...ed warranty or condition of merchantabil ity fitness for a particular purpose or satisfactory qual ity For transactions in Australia and New Zealand The war ranty terms contained in this statement exc...

Page 210: ......

Page 211: ...433 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 Latin...

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