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Agilent Technologies E3633A, E3634A manual Tutorial Output Characteristics

Models: E3634A E3633A

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Chapter 7 Tutorial

Chapter 7 Tutorial

Output Characteristics

Output Characteristics

An ideal constant-voltage power supply would have a zero output impedance at all frequencies. Thus, as shown in Figure 7-3, the voltage would remain perfectly constant in spite of any changes in output current demanded by the load.

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

The ideal constant-current power supply exhibits an infinite output impedance at all frequencies. Thus as Figure 7-4 indicates, the ideal constant-current power supply would accommodate a load resistance change by altering its output voltage by just the amount necessary to maintain its output current at a constant value.

The output of the E3633A and E3634A power supplies 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.

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Agilent Technologies E3633A, E3634A manual Tutorial Output Characteristics

Contents

3DUW1XPEHU $SULO User’s Guide$JLOHQW$DQG$ &3RZHU6XSSOLHV ‹&RS\ULJKW$JLOHQW7HFKQRORJLHV,QF $OO5LJKWV5HVHUYHGAgilent E3633A and E3634A DC Power Supplies Convenient bench-top featuresFlexible 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 Contents Execution Errors Self-Test Errors Calibration ErrorsChapter 8 Specifications ContentsContents Output Isolation Multiple Loads Remote Voltage SensingGeneral Information Safety Considerations Safety and EMC RequirementsGeneral Information Options and Accessories AccessoriesOptions Description Chapter 1 General Information DescriptionVoltage and current programming Voltage and current readback from the terminals so there is no operator access to the output conductors without Installation Initial InspectionCooling and Location Chapter 1 General Information Installation Rack Mounting Chapter 1 General Information Installation Input Power Requirements Power-Line CordPower-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 Power-On Checkout ADDR 05 or RS-232Output Checkout Voltage Output CheckoutCurrent Output Checkout Output On/Off Display Limit Voltage CurrentPage Chapter 2 Initial Operation Output Checkout Front-Panel Operation Front-Panel Operation Front-Panel Operation Overview Chapter 3 Front-Panel Operation Front-Panel Operation OverviewConstant Voltage Operation preset current limit and the output voltage will drop proportionately Constant Current Operation Display LimitDuring actual CC operation, if a load change causes the voltage limit to be exceeded STORE Storing and Recalling Operating StatesSTORE Store7 Restore the operating state DONERECALL RECALLLEVEL 22.0V E3633A LEVEL 55.0V E3634A Setting the OVP Level and Enable the OVP CircuitProgramming Overvoltage Protection OVP ONCHANGED Checking OVP OperationClearing the Overvoltage Condition OVP CLEAROVP CLEAR Over Voltage Over Voltage Over Voltage Over VoltageFigure 3-1. Recommended Protection Circuit for Battery Charging Chapter 3 Front-Panel Operation Programming Overvoltage ProtectionLEVEL 22.0 A E3633A LEVEL 7.5 A E3634A Setting the OCP Level and Enable the OCP CircuitProgramming Overcurrent Protection OCP ONOCP CLEAR Checking OCP OperationClearing the Overcurrent Condition CHANGEDOCP CLEAR Over Current Over Current Over Current Over CurrentOutput Noise CV RegulationOutput Rating Remote Voltage Sensing at the Front and Rear TerminalsStability Remote Voltage Sensing ConnectionsRemote Voltage Sensing at the Rear Panel Disabling the Output Disabling the Output Using an External Relay Knob LockingSystem-Related Operations Self-TestError Conditions 3 ERRDisplay Control Display the string enclosed in quotesChapter 3 Front-Panel Operation System-Related Operations Firmware Revision QuerySCPI Language Version You can query the firmware revision from the remote interface onlyRemote Interface Configuration Remote Interface SelectionGPIB Address Baud Rate Selection RS-232Parity Selection RS-232 ADDR To Set the GPIB AddressGPIB CHANGE SAVED9600 To Set the Baud Rate and Parity RS-232RS-232 BAUDI/O Config CHANGE SAVEDGPIB Interface Configuration RS-232 Interface Configuration RS-232 Configuration OverviewRS-232 Data Frame Format Connection to a Computer or Terminal DTR / DSR Handshake Protocol RS-232 Troubleshooting Calibration Overview Calibration SecuritySECURED 000000 CODEUNSECURED SECURED UNSECURED000000 CODE Chapter 3 Front-Panel Operation Calibration OverviewChange the security code Unsecure with old codeChapter 3 Front-Panel Operation Calibration Overview Calibration CountCalibration Message CALCOUN?Remote Interface Reference program the power supply Remote Interface ReferenceSCPI Command Summary Chapter 4 Remote Interface Reference SCPI Command SummarySCPI First-time SCPI users, see page numeric value DEFault Chapter 4 Remote Interface Reference SCPI Command SummaryOutput Setting and Measurement Commands numeric valueDEFaultSystem-Related Commands Chapter 4 Remote Interface Reference SCPI Command SummaryTriggering Commands TEXTCLEar SYSTem BEEPerIMMediate ERRor? VERSion? OUTPutStatus Reporting Commands Chapter 4 Remote Interface Reference SCPI Command SummaryCalibration Commands CALibration COUNt? CURRentDATA numeric value CURRentLEVel MINMIDMAXIEEE-488.2 Common Commands Chapter 4 Remote Interface Reference SCPI Command SummaryRS-232 Interface Commands SYSTem LOCal REMote RWLockUsing the APPLy Command Using the Low-Level CommandsSimplified Programming Overview Reading a Query Response Selecting a Trigger SourcePower Supply Programming Ranges Table 4-1. Agilent E3633A Programming RangesTable 4-2. Agilent E3634A Programming Ranges APPLy voltage DEF MIN MAX,current DEF MIN MAX Using the APPLy CommandChapter 4 Remote Interface Reference Using the APPLy Command 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? DEFault Output Setting and Operation CommandsVOLTageSTEP numeric valueDEFault 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 Triggering Commands Trigger Source ChoicesTo select the immediate trigger source, send the following command Triggering Commands DISPlay OFF ON System-Related CommandsChapter 4 Remote Interface Reference System-Related Commands DISPlay?SYSTemERRor? Chapter 4 Remote Interface Reference System-Related CommandsOUTPREL command +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 Event Register? What is an Enable Register?The SCPI Status Registers Chapter 4 Remote Interface Reference The SCPI Status Registers SCPI Status SystemBinary Weight 20 = 21 = 22 = 23 = 24 = 25 = 26 = 27 = 28 = 29 = 210 = 211 = 212 = 213 = 214 = 215 =The Questionable Status Register Command Error. A command syntax error occurred see The Standard Event RegisterExecution Error. An execution error occurred see error Power On. Power has been turned off and on since theChapter 4 Remote Interface Reference The SCPI Status Registers The Status Byte RegisterThe Standard Event Enable register is cleared when The Standard Event register is cleared whenUsing Service Request SRQ and Serial POLL Using *STB? to Read the Status Byte Using the Message Available Bit MAVTo Interrupt Your Bus Controller Using SRQ To Determine When a Command Sequence is Completed Using *OPC to Signal When Data is in the Output BufferSYSTemERRor? Status Reporting CommandsChapter 4 Remote Interface Reference Status Reporting Commands STATusQUEStionableCONDition?This command clears all event registers and Status Byte register Chapter 4 Remote Interface Reference Status Reporting Commands PSC? SRE?STB? TRIGgered currentMINMAX TRIGgered?MINMAX VOLTage voltageMINMAXUPDOWN An Introduction to the SCPI LanguageSOURce CURRent currentMINMAXUPDOWN CURRent? MINMAX CURRent VOLTage? MINMAX VOLTage TRIGgered voltageMINMAX TRIGgered? MINMAXCommand Format Used in This Manual Command Separators Using the MIN and MAX ParametersQuerying Parameter Settings SCPI Command TerminatorsIEEE-488.2 Common Commands SCPI Parameter Types Halting an Output in Progress SCPI Conformance Information SCPI Confirmed CommandsChapter 4 Remote Interface Reference SCPI Conformance Information SCPI Confirmed Commands continued Chapter 4 Remote Interface Reference SCPI Conformance InformationSOURce VOLTageLEVelIMMediateAMPLitude voltageMINMAXUPDOWN STRing quoted string STRing? APPLy voltageDEFMINMAX,currentDEFMINMAX APPLy?SECureCODE new code SECureSTATe OFFON,code SECureSTATe? OUTPut RELaySTATe OFFON RELaySTATE?IEEE-488 Conformance Information Error Messages Error Messages 3 ERRStore 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 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 supply Application ProgramsDiode.c Example Program for C and C++Chapter 6 Application Programs Example Program for C and C++ Continued on next page 135Chapter 6 Application Programs Example Program for C and C++ Continued on next page 136Chapter 6 Application Programs Example Program for C and C++ Continued on next page 137strcatVISAaddress,GPIBAddress strcatVISAaddress,INSTR Chapter 6 Application Programs Example Program for C and C++ void CheckErrorchar* pMessageif ErrorStatus VISUCCESS printf\n %s,pMessage ClosePort exit0 End of Program 138Example Example Program for ExcelChapter 6 Application Programs Example Program for Excel 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 Chapter 6 Application Programs Example Program for Excel Diode Macro Continued on next page 141Dim commandString As String Chapter 6 Application Programs Example Program for ExcelEnd of Program 142 Declaration for Windows 95/NT Chapter 6 Application Programs Example Program for ExcelDeclaration for Windows This routine requires the file VISA.dll. It typically resides in theChapter 6 Application Programs Example Program for Excel 144 Tutorial Output Characteristics, starting on page TutorialOverview of Agilent E3633A and Agilent E3634A Operation Figure 7-1. Diagram of Simple Series Power SupplyPOWER SUPPLY OUTPUT OPTICAL ISOLATIONCONTROL DISPLAY Output Characteristics Chapter 7 Tutorial Output CharacteristicsFigure 7-5. Output Characteristics Unwanted Signals Unregulated StateFigure 7-6. Simplified Diagram of Common Mode and Normal Mode Sources of NoiseE3633A E3634A Connecting the Load Output IsolationMultiple Loads Remote Voltage Sensing Figure 7-7. Regulated Power Supply with Remote SensingLoad Consideration Chapter 7 Tutorial Connecting the Load Reverse Current Loading Extending the Voltage and Current Range Series ConnectionsParallel Connections Remote Programming Figure 7-8. Speed of Response - Programming Up Full LoadFigure 7-9. Speed of Response - Programming Down Reliability Chapter 7 Tutorial ReliabilitySpecifications Specifications Performance Specifications Chapter 8 Specifications Performance SpecificationsTable 1-1. Performance Specifications OVP and OCP Accuracy, ±% of output + offset Remote Sensing Capability Supplemental CharacteristicsChapter 8 Specifications Supplemental Characteristics Temperature Coefficient, ±% of output + offsetSCPI 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 Index Index Uweight of power supply 167 wire rating wires sizes unregulated state condition 151 up-programming responseCopyright 1998 Agilent Technologies All Rights Reserved DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN