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Agilent Technologies E3634A, E3633A manual Programming Overcurrent Protection, Ocp On

Models: E3634A E3633A

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Programming Overcurrent Protection

Power

Output On/Off

Over Current

Over Current

Chapter 3 Front-Panel Operation

Programming Overcurrent Protection

Programming Overcurrent Protection

Overcurrent protection guards the load against output currents that reach a specified value greater than the programmed protection level. It is accomplished by programming the output current to zero.

The following steps show how to set the overcurrent protection trip level, how to check OCP operation and how to clear overcurrent condition.

• Front-panel operation:

Setting the OCP Level and Enable the OCP Circuit

1Turn on the power supply.

The power supply will go into the power-on / reset state; the output is disabled (the OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the 8V* or 25V** annunciator turns on); and the knob is selected for voltage control.

2Enable the output.

The OFF annunciator turns off and the display will go to the meter mode.

3Enter the OCP menu and set the trip level.

LEVEL 22.0 A (E3633A)

LEVEL 7.5 A (E3634A)

You will see the above message on the display when you enter the OCP menu. Adjust the knob for the desired OCP trip level.

4Enable the OCP circuit.

OCP ON

You will see the above message after pressing the OverCurrent key.

*For Agilent E3633A Model **For Agilent E3634A Model

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Agilent Technologies E3634A Programming Overcurrent Protection, Setting the OCP Level and Enable the OCP Circuit, Ocp On

Contents

‹&RS\ULJKW$JLOHQW7HFKQRORJLHV,QF $OO5LJKWV5HVHUYHG User’s Guide$JLOHQW$DQG$ &3RZHU6XSSOLHV 3DUW1XPEHU $SULOFlexible system features Agilent E3633A and E3634A DC Power SuppliesConvenient bench-top 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 ContentsChapter 4 Remote Interface Reference ContentsContents Execution Errors Self-Test Errors Calibration Errors ContentsOutput Isolation Multiple Loads Remote Voltage Sensing ContentsContents Chapter 8 SpecificationsGeneral Information General Information Safety ConsiderationsSafety and EMC Requirements Options Options and AccessoriesAccessories 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 Cooling and Location InstallationInitial Inspection Chapter 1 General Information Installation Rack Mounting Chapter 1 General Information Installation Power-Line Voltage Selection Input Power RequirementsPower-Line Cord 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 STORE7 Restore the operating state DONERECALL 5 Turn on the recall modeOVP ON Setting the OVP Level and Enable the OVP CircuitProgramming Overvoltage Protection LEVEL 22.0V E3633A LEVEL 55.0V E3634AOVP CLEAR Checking OVP OperationClearing the Overvoltage Condition CHANGEDOver Voltage Over Voltage Over Voltage Over Voltage OVP CLEARChapter 3 Front-Panel Operation Programming Overvoltage Protection Figure 3-1. Recommended Protection Circuit for Battery ChargingOCP ON Setting the OCP Level and Enable the OCP CircuitProgramming Overcurrent Protection LEVEL 22.0 A E3633A LEVEL 7.5 A E3634ACHANGED Checking OCP OperationClearing the Overcurrent Condition OCP CLEAROver Current Over Current Over Current Over Current OCP CLEARRemote Voltage Sensing at the Front and Rear Terminals CV RegulationOutput Rating Output NoiseRemote 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 ControlYou can query the firmware revision from the remote interface only Firmware Revision QuerySCPI Language Version Chapter 3 Front-Panel Operation System-Related OperationsRemote Interface Selection Remote Interface ConfigurationParity Selection RS-232 GPIB AddressBaud Rate Selection RS-232 CHANGE SAVED To Set the GPIB AddressGPIB ADDRBAUD To Set the Baud Rate and Parity RS-232RS-232 9600CHANGE SAVED I/O ConfigGPIB Interface Configuration RS-232 Data Frame Format RS-232 Interface ConfigurationRS-232 Configuration Overview Connection to a Computer or Terminal DTR / DSR Handshake Protocol RS-232 Troubleshooting Calibration Security Calibration OverviewUNSECURED SECURED000000 CODE Chapter 3 Front-Panel Operation Calibration Overview UNSECURED000000 CODE SECUREDUnsecure with old code Change the security codeCALCOUN? Calibration CountCalibration Message Chapter 3 Front-Panel Operation Calibration OverviewRemote Interface Reference Remote Interface Reference program the power supplySCPI First-time SCPI users, see page SCPI Command SummaryChapter 4 Remote Interface Reference SCPI Command Summary numeric valueDEFault Chapter 4 Remote Interface Reference SCPI Command SummaryOutput Setting and Measurement Commands numeric value DEFaultINITiateIMMediate TRIGgerSEQuence DELay secondsMINMAX DELay? Chapter 4 Remote Interface Reference SCPI Command SummaryTriggering Commands System-Related CommandsCALibration COUNt? CURRentDATA numeric value CURRentLEVel MINMIDMAX Chapter 4 Remote Interface Reference SCPI Command SummaryCalibration Commands Status Reporting CommandsSYSTem LOCal REMote RWLock Chapter 4 Remote Interface Reference SCPI Command SummaryRS-232 Interface Commands IEEE-488.2 Common CommandsSimplified Programming Overview Using the APPLy CommandUsing the Low-Level Commands Selecting a Trigger Source Reading a Query ResponseTable 4-2. Agilent E3634A Programming Ranges Power Supply Programming RangesTable 4-1. Agilent E3633A Programming Ranges APPLy? Using the APPLy CommandChapter 4 Remote Interface Reference Using the APPLy Command APPLy voltage DEF MIN MAX,current DEF MIN MAXOutput 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 Chapter 4 Remote Interface Reference Output Setting and Operation CommandsVOLTageSTEP numeric valueDEFault VOLTageSTEP? DEFaultThis 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 DISPlay? System-Related CommandsChapter 4 Remote Interface Reference System-Related Commands DISPlay OFF ON+0, ‘‘No error’’ Chapter 4 Remote Interface Reference System-Related CommandsOUTPREL command SYSTemERRor?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 The SCPI Status Registers What is an Event Register?What is an Enable Register? 211 = 212 = 213 = 214 = 215 = SCPI Status SystemBinary Weight 20 = 21 = 22 = 23 = 24 = 25 = 26 = 27 = 28 = 29 = 210 = Chapter 4 Remote Interface Reference The SCPI Status RegistersThe Questionable Status Register Power On. Power has been turned off and on since the The Standard Event RegisterExecution Error. An execution error occurred see error Command Error. A command syntax error occurred seeThe Standard Event register is cleared when The Status Byte RegisterThe Standard Event Enable register is cleared when Chapter 4 Remote Interface Reference The SCPI Status RegistersUsing Service Request SRQ and Serial POLL To Interrupt Your Bus Controller Using SRQ Using *STB? to Read the Status ByteUsing the Message Available Bit MAV Using *OPC to Signal When Data is in the Output Buffer To Determine When a Command Sequence is CompletedSTATusQUEStionableCONDition? Status Reporting CommandsChapter 4 Remote Interface Reference Status Reporting Commands SYSTemERRor?This command clears all event registers and Status Byte register STB? Chapter 4 Remote Interface Reference Status Reporting Commands PSC?SRE? VOLTage? MINMAX VOLTage TRIGgered voltageMINMAX TRIGgered? MINMAX An Introduction to the SCPI LanguageSOURce CURRent currentMINMAXUPDOWN CURRent? MINMAX CURRent TRIGgered currentMINMAX TRIGgered?MINMAX VOLTage voltageMINMAXUPDOWNCommand Format Used in This Manual Using the MIN and MAX Parameters Command SeparatorsIEEE-488.2 Common Commands Querying Parameter SettingsSCPI Command Terminators SCPI Parameter Types Halting an Output in Progress Chapter 4 Remote Interface Reference SCPI Conformance Information SCPI Conformance InformationSCPI Confirmed Commands SOURce VOLTageLEVelIMMediateAMPLitude voltageMINMAXUPDOWN SCPI Confirmed Commands continuedChapter 4 Remote Interface Reference SCPI Conformance Information OUTPut RELaySTATe OFFON RELaySTATE? APPLy voltageDEFMINMAX,currentDEFMINMAX APPLy?SECureCODE new code SECureSTATe OFFON,code SECureSTATe? STRing quoted string STRing?IEEE-488 Conformance Information Error Messages Store Error Messages3 ERR 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 supplyContinued on next page 135 Example Program for C and C++Chapter 6 Application Programs Example Program for C and C++ Diode.cContinued on next page 136 Chapter 6 Application Programs Example Program for C and C++strcatVISAaddress,GPIBAddress strcatVISAaddress,INSTR 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++ void CheckErrorchar* pMessageif ErrorStatus VISUCCESS printf\n %s,pMessage ClosePort exit0 void delayclockt waitprogram result Example Program for ExcelChapter 6 Application Programs Example Program for Excel ExampleTo 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 MacroEnd of Program 142 Dim commandString As StringChapter 6 Application Programs Example Program for Excel This routine requires the file VISA.dll. It typically resides in the Chapter 6 Application Programs Example Program for ExcelDeclaration for Windows Declaration for Windows 95/NTChapter 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 OperationCONTROL DISPLAY POWER SUPPLY OUTPUTOPTICAL ISOLATION Chapter 7 Tutorial Output Characteristics Output CharacteristicsFigure 7-5. Output Characteristics Unregulated State Unwanted SignalsE3633A E3634A Figure 7-6. Simplified Diagram of Common Mode and Normal ModeSources of Noise Multiple Loads Connecting the LoadOutput Isolation Figure 7-7. Regulated Power Supply with Remote Sensing Remote Voltage SensingLoad Consideration Chapter 7 Tutorial Connecting the Load Reverse Current Loading Parallel Connections Extending the Voltage and Current RangeSeries 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 Table 1-1. Performance Specifications Performance SpecificationsChapter 8 Specifications 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 Indexoutput programming range 165 output ratings IndexIndex unregulated state condition 151 up-programming response Index Uweight of power supply 167 wire rating wires sizes IndexCopyright 1998 Agilent Technologies All Rights Reserved according to ISO/IEC Guide 22 and EN DECLARATION OF CONFORMITY