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Agilent Technologies E3634A, E3633A manual Tutorial Connecting the Load Reverse Current Loading

Models: E3634A E3633A

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Chapter 7 Tutorial

Connecting the Load

Reverse Current Loading

An active load connected to the power supply may actually deliver a reverse current to the supply during a portion of its operating cycle. An external source can not be allowed to pump current into the supply without risking loss of regulation and possible damage. These effects can be avoided by preloading the output with a dummy load resistor. The dummy load resistor should draw at least the same amount of current from the supply as the active load may deliver to the supply. The value of the current for the dummy load plus the value of the current the load draws from the supply must be less than the maximum current of the supply.

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Agilent Technologies E3634A, E3633A manual Tutorial Connecting the Load Reverse Current Loading

Contents

$JLOHQW$DQG$ &3RZHU6XSSOLHV User’s Guide3DUW1XPEHU $SULO ‹&RS\ULJKW$JLOHQW7HFKQRORJLHV,QF $OO5LJKWV5HVHUYHGConvenient bench-top features Agilent E3633A and E3634A DC Power SuppliesFlexible system features The Front Panel at a Glance For Agilent E3633A Model **For Agilent E3634A Model Front-Panel Voltage and Current Limit Settings Display Annunciators The Rear Panel at a Glance In This Book Page Contents ContentsContents ContentsChapter 4 Remote Interface Reference Execution Errors Self-Test Errors Calibration Errors ContentsContents ContentsChapter 8 Specifications Output Isolation Multiple Loads Remote Voltage SensingGeneral Information Safety and EMC Requirements Safety ConsiderationsGeneral Information Accessories Options and AccessoriesOptions Chapter 1 General Information Description DescriptionVoltage and current programming Voltage and current readback from the terminals so there is no operator access to the output conductors without Initial Inspection InstallationCooling and Location Chapter 1 General Information Installation Rack Mounting Chapter 1 General Information Installation Power-Line Cord Input Power RequirementsPower-Line Voltage Selection 100 or 115 Vac, 6.3 AT fuse 230 Vac, 3.15 AT fuse Chapter 1 General Information Input Power Requirements Initial Operation Initial Operation Preliminary Checkout ADDR 05 or RS-232 Power-On CheckoutVoltage Output Checkout Output CheckoutOutput On/Off Display Limit Voltage Current Current Output CheckoutPage Chapter 2 Initial Operation Output Checkout Front-Panel Operation Front-Panel Operation Chapter 3 Front-Panel Operation Front-Panel Operation Overview Front-Panel Operation OverviewConstant Voltage Operation preset current limit and the output voltage will drop proportionately Display Limit Constant Current OperationDuring actual CC operation, if a load change causes the voltage limit to be exceeded STORE Storing and Recalling Operating StatesSTORE StoreRECALL DONE5 Turn on the recall mode 7 Restore the operating stateProgramming Overvoltage Protection Setting the OVP Level and Enable the OVP CircuitLEVEL 22.0V E3633A LEVEL 55.0V E3634A OVP ONClearing the Overvoltage Condition Checking OVP OperationCHANGED OVP CLEAROver Voltage Over Voltage Over Voltage Over Voltage OVP CLEARChapter 3 Front-Panel Operation Programming Overvoltage Protection Figure 3-1. Recommended Protection Circuit for Battery ChargingProgramming Overcurrent Protection Setting the OCP Level and Enable the OCP CircuitLEVEL 22.0 A E3633A LEVEL 7.5 A E3634A OCP ONClearing the Overcurrent Condition Checking OCP OperationOCP CLEAR CHANGEDOver Current Over Current Over Current Over Current OCP CLEAROutput Rating CV RegulationOutput Noise Remote Voltage Sensing at the Front and Rear TerminalsRemote Voltage Sensing Connections StabilityRemote Voltage Sensing at the Rear Panel Disabling the Output Knob Locking Disabling the Output Using an External RelaySelf-Test System-Related Operations3 ERR Error ConditionsDisplay the string enclosed in quotes Display ControlSCPI Language Version Firmware Revision QueryChapter 3 Front-Panel Operation System-Related Operations You can query the firmware revision from the remote interface onlyRemote Interface Selection Remote Interface ConfigurationBaud Rate Selection RS-232 GPIB AddressParity Selection RS-232 GPIB To Set the GPIB AddressADDR CHANGE SAVEDRS-232 To Set the Baud Rate and Parity RS-2329600 BAUDCHANGE SAVED I/O ConfigGPIB Interface Configuration RS-232 Configuration Overview RS-232 Interface ConfigurationRS-232 Data Frame Format Connection to a Computer or Terminal DTR / DSR Handshake Protocol RS-232 Troubleshooting Calibration Security Calibration Overview000000 CODE SECUREDUNSECURED 000000 CODE UNSECUREDSECURED Chapter 3 Front-Panel Operation Calibration OverviewUnsecure with old code Change the security codeCalibration Message Calibration CountChapter 3 Front-Panel Operation Calibration Overview CALCOUN?Remote Interface Reference Remote Interface Reference program the power supplyChapter 4 Remote Interface Reference SCPI Command Summary SCPI Command SummarySCPI First-time SCPI users, see page Output Setting and Measurement Commands Chapter 4 Remote Interface Reference SCPI Command Summarynumeric value DEFault numeric valueDEFaultTriggering Commands Chapter 4 Remote Interface Reference SCPI Command SummarySystem-Related Commands INITiateIMMediate TRIGgerSEQuence DELay secondsMINMAX DELay?Calibration Commands Chapter 4 Remote Interface Reference SCPI Command SummaryStatus Reporting Commands CALibration COUNt? CURRentDATA numeric value CURRentLEVel MINMIDMAXRS-232 Interface Commands Chapter 4 Remote Interface Reference SCPI Command SummaryIEEE-488.2 Common Commands SYSTem LOCal REMote RWLockUsing the Low-Level Commands Using the APPLy CommandSimplified Programming Overview Selecting a Trigger Source Reading a Query ResponseTable 4-1. Agilent E3633A Programming Ranges Power Supply Programming RangesTable 4-2. Agilent E3634A Programming Ranges Chapter 4 Remote Interface Reference Using the APPLy Command Using the APPLy CommandAPPLy voltage DEF MIN MAX,current DEF MIN MAX APPLy?Output Setting and Operation Commands This query returns the presently programmed current level of the power supply. CURR? MAX and CURR? MIN return the highest and lowest programmable current levels for the selected range This command sets the current level at which the overcurrent protection OCP circuit will trip. If the peak output current exceeds the OCP level, then the output current is programmed to zero. The Questionable Status register ‘‘OC’’ bit is set see page 103. An overcurrent condition can be cleared with the CURRPROTCLE command after the condition that caused the OCP trip is removed The following program segments show how to use the VOLT UP or VOLTageSTEP numeric valueDEFault Output Setting and Operation CommandsVOLTageSTEP? DEFault Chapter 4 Remote Interface ReferenceThis query returns the overvoltage protection trip level presently programmed. VOLTPROT? MAX and VOLTPROT? MIN return the maximum and minimum programmable overvoltage trip levels This query returns the currently selected range. The returned parameter for the Agilent E3633A is ‘‘P20V’’ HIGH or ‘‘P8V’’ LOW and the parameter for the Agilent E3634A is ‘‘P50V’’ HIGH or ‘‘P25V’’ LOW Trigger Source Choices Triggering CommandsTo select the immediate trigger source, send the following command Triggering Commands Chapter 4 Remote Interface Reference System-Related Commands System-Related CommandsDISPlay OFF ON DISPlay?OUTPREL command Chapter 4 Remote Interface Reference System-Related CommandsSYSTemERRor? +0, ‘‘No error’’This command resets the power supply to its power-on state as follows To recall a stored state, you must use the same memory location used Calibration Commands This command corrects the differential nonlinearity error of the internal DAC without an external meter. You must send this command before calibrating the voltage. It takes about 30 seconds to execute the command This command can only be used after calibration is unsecured and the output state is ON. It sets the power supply to a calibration point that is entered with CALVOLT command. During calibration, three points must be entered and the low-end point MIN must be selected and entered first RS-232 Interface Commands What is an Enable Register? What is an Event Register?The SCPI Status Registers Binary Weight 20 = 21 = 22 = 23 = 24 = 25 = 26 = 27 = 28 = 29 = 210 = SCPI Status SystemChapter 4 Remote Interface Reference The SCPI Status Registers 211 = 212 = 213 = 214 = 215 =The Questionable Status Register Execution Error. An execution error occurred see error The Standard Event RegisterCommand Error. A command syntax error occurred see Power On. Power has been turned off and on since theThe Standard Event Enable register is cleared when The Status Byte RegisterChapter 4 Remote Interface Reference The SCPI Status Registers The Standard Event register is cleared whenUsing Service Request SRQ and Serial POLL Using the Message Available Bit MAV Using *STB? to Read the Status ByteTo Interrupt Your Bus Controller Using SRQ Using *OPC to Signal When Data is in the Output Buffer To Determine When a Command Sequence is CompletedChapter 4 Remote Interface Reference Status Reporting Commands Status Reporting CommandsSYSTemERRor? STATusQUEStionableCONDition?This command clears all event registers and Status Byte register SRE? Chapter 4 Remote Interface Reference Status Reporting Commands PSC?STB? SOURce CURRent currentMINMAXUPDOWN CURRent? MINMAX CURRent An Introduction to the SCPI LanguageTRIGgered currentMINMAX TRIGgered?MINMAX VOLTage voltageMINMAXUPDOWN VOLTage? MINMAX VOLTage TRIGgered voltageMINMAX TRIGgered? MINMAXCommand Format Used in This Manual Using the MIN and MAX Parameters Command SeparatorsSCPI Command Terminators Querying Parameter SettingsIEEE-488.2 Common Commands SCPI Parameter Types Halting an Output in Progress SCPI Confirmed Commands SCPI Conformance InformationChapter 4 Remote Interface Reference SCPI Conformance Information Chapter 4 Remote Interface Reference SCPI Conformance Information SCPI Confirmed Commands continuedSOURce VOLTageLEVelIMMediateAMPLitude voltageMINMAXUPDOWN SECureCODE new code SECureSTATe OFFON,code SECureSTATe? APPLy voltageDEFMINMAX,currentDEFMINMAX APPLy?STRing quoted string STRing? OUTPut RELaySTATe OFFON RELaySTATE?IEEE-488 Conformance Information Error Messages 3 ERR Error MessagesStore Execution Errors A command header was received which contained more than the maximum particular element received was not valid for the header executed due to the current device state data is lost Self-Test Errors Calibration Errors Chapter 5 Error Messages Calibration Errors Application Programs Application Programs This chapter contains two application programs over the remote interface to help you develop programs for your own application. Chapter 4, “Remote Interface Reference,” starting on page 73, lists the syntax for the SCPI Standard Commands for Programmable Instruments commands available to program the power supplyChapter 6 Application Programs Example Program for C and C++ Example Program for C and C++Diode.c Continued on next page 135Continued on next page 136 Chapter 6 Application Programs Example Program for C and C++Continued on next page 137 Chapter 6 Application Programs Example Program for C and C++strcatVISAaddress,GPIBAddress strcatVISAaddress,INSTR if ErrorStatus VISUCCESS printf\n %s,pMessage ClosePort exit0 void CheckErrorchar* pMessagevoid delayclockt wait Chapter 6 Application Programs Example Program for C and C++Chapter 6 Application Programs Example Program for Excel Example Program for ExcelExample program resultTo write an Excel macro you must first open a module in Excel. Go to the View menu, choose Toolbars, and then select Control Toolbox. The Control Toolbox dialog box appears. Select the Command button in the dialog box. Click cell A1 and drag across the cell B3. The “CommandButton1” box is created. To change the button name, click the right mouse button on that button and then select Properties. The Properties dialog box appears. In the Properties dialog, change the “name” and “caption” to “Diode”. To try the example for characterizing a diode, type “Voltages” in cell A4 and “Current” in cell B4. In cell A5 type 0.6. Fill in the cells A5 to A15 in 0.02 increments so that cell A15 contains Continued on next page 141 Chapter 6 Application Programs Example Program for Excel Diode MacroChapter 6 Application Programs Example Program for Excel Dim commandString As StringEnd of Program 142 Declaration for Windows Chapter 6 Application Programs Example Program for ExcelDeclaration for Windows 95/NT This routine requires the file VISA.dll. It typically resides in theChapter 6 Application Programs Example Program for Excel 144 Tutorial Tutorial Output Characteristics, starting on pageFigure 7-1. Diagram of Simple Series Power Supply Overview of Agilent E3633A and Agilent E3634A OperationOPTICAL ISOLATION POWER SUPPLY OUTPUTCONTROL DISPLAY Chapter 7 Tutorial Output Characteristics Output CharacteristicsFigure 7-5. Output Characteristics Unregulated State Unwanted SignalsSources of Noise Figure 7-6. Simplified Diagram of Common Mode and Normal ModeE3633A E3634A Output Isolation Connecting the LoadMultiple Loads Figure 7-7. Regulated Power Supply with Remote Sensing Remote Voltage SensingLoad Consideration Chapter 7 Tutorial Connecting the Load Reverse Current Loading Series Connections Extending the Voltage and Current RangeParallel Connections Figure 7-8. Speed of Response - Programming Up Full Load Remote ProgrammingFigure 7-9. Speed of Response - Programming Down Chapter 7 Tutorial Reliability ReliabilitySpecifications Specifications Chapter 8 Specifications Performance Specifications Performance SpecificationsTable 1-1. Performance Specifications OVP and OCP Accuracy, ±% of output + offset Chapter 8 Specifications Supplemental Characteristics Supplemental CharacteristicsTemperature Coefficient, ±% of output + offset Remote Sensing CapabilitySCPI Standard Commands for Programmable Instruments 20 to 70 C for storage environment Chapter 8 Specifications Supplemental Characteristics 168 Index IndexIndex IndexIndex Indexoutput programming range 165 output ratings weight of power supply 167 wire rating wires sizes Index UIndex unregulated state condition 151 up-programming responseCopyright 1998 Agilent Technologies All Rights Reserved according to ISO/IEC Guide 22 and EN DECLARATION OF CONFORMITY