Manuals / Agilent Technologies / Lawn and Garden / Portable Generator

Agilent Technologies E3633A, E3634A manual 9. Speed of Response - Programming Down

Models: E3634A E3633A

1 175

Download 175 pages 17.89 Kb

Page 160

Figure 7-9. Speed of Response - Programming Down

Chapter 7 Tutorial

Remote Programming

If no load resistor is attached to the power supply output terminal, then the output voltage will rise linearly at a rate of CO/IL when programmed upward, and TR = CO(E2 -E1)/IL, the shortest possible up-programming time.

Figure 7-9. Speed of Response - Programming Down

Figure 7-9 shows that when the power supply is programmed down, the regulator senses that the output voltage is higher than desired and turns off the series transistors entirely. Since the 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 output voltage decays linearly with slope of IS/CO with no load and stops falling when it reaches the new output voltage which has been demanded. If full load is connected, the output voltage will fall exponentially faster.

Since up-programming speed is aided by the conduction of the series regulating transistor, while down programming normally has no active element aiding in the discharge of the output capacitor, laboratory power supplies normally program upward more rapidly than downward.

159

7

Image 160

Agilent Technologies E3633A, E3634A manual 9. Speed of Response - Programming Down

Contents

User’s Guide $JLOHQW$DQG$ &3RZHU6XSSOLHV3DUW1XPEHU $SULO ‹&RS\ULJKW$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 Contents Execution Errors Self-Test Errors Calibration ErrorsContents ContentsChapter 8 Specifications Output Isolation Multiple Loads Remote Voltage SensingGeneral Information Safety and EMC Requirements Safety ConsiderationsGeneral Information Accessories Options and 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 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 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 Storing and Recalling Operating States STORESTORE StoreDONE RECALL5 Turn on the recall mode 7 Restore the operating stateSetting the OVP Level and Enable the OVP Circuit Programming Overvoltage ProtectionLEVEL 22.0V E3633A LEVEL 55.0V E3634A OVP ONChecking OVP Operation Clearing the Overvoltage ConditionCHANGED 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 ProtectionSetting the OCP Level and Enable the OCP Circuit Programming Overcurrent ProtectionLEVEL 22.0 A E3633A LEVEL 7.5 A E3634A OCP ONChecking OCP Operation Clearing the Overcurrent ConditionOCP CLEAR CHANGEDOCP CLEAR Over Current Over Current Over Current Over CurrentCV Regulation Output RatingOutput Noise 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 quotesFirmware Revision Query SCPI Language VersionChapter 3 Front-Panel Operation System-Related Operations You can query the firmware revision from the remote interface onlyRemote Interface Configuration Remote Interface SelectionBaud Rate Selection RS-232 GPIB AddressParity Selection RS-232 To Set the GPIB Address GPIBADDR CHANGE SAVEDTo Set the Baud Rate and Parity RS-232 RS-2329600 BAUDI/O Config CHANGE SAVEDGPIB 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 Overview Calibration Security000000 CODE SECUREDUNSECURED UNSECURED 000000 CODESECURED Chapter 3 Front-Panel Operation Calibration OverviewChange the security code Unsecure with old codeCalibration Count Calibration MessageChapter 3 Front-Panel Operation Calibration Overview CALCOUN?Remote Interface Reference program the power supply Remote Interface ReferenceChapter 4 Remote Interface Reference SCPI Command Summary SCPI Command SummarySCPI First-time SCPI users, see page Chapter 4 Remote Interface Reference SCPI Command Summary Output Setting and Measurement Commandsnumeric value DEFault numeric valueDEFaultChapter 4 Remote Interface Reference SCPI Command Summary Triggering CommandsSystem-Related Commands INITiateIMMediate TRIGgerSEQuence DELay secondsMINMAX DELay?Chapter 4 Remote Interface Reference SCPI Command Summary Calibration CommandsStatus Reporting Commands CALibration COUNt? CURRentDATA numeric value CURRentLEVel MINMIDMAXChapter 4 Remote Interface Reference SCPI Command Summary RS-232 Interface CommandsIEEE-488.2 Common Commands SYSTem LOCal REMote RWLockUsing the Low-Level Commands Using the APPLy CommandSimplified Programming Overview Reading a Query Response Selecting a Trigger SourceTable 4-1. Agilent E3633A Programming Ranges Power Supply Programming RangesTable 4-2. Agilent E3634A Programming Ranges Using the APPLy Command Chapter 4 Remote Interface Reference 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 Output Setting and Operation Commands VOLTageSTEP numeric valueDEFaultVOLTageSTEP? 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 Triggering Commands Trigger Source ChoicesTo select the immediate trigger source, send the following command Triggering Commands System-Related Commands Chapter 4 Remote Interface Reference System-Related CommandsDISPlay OFF ON DISPlay?Chapter 4 Remote Interface Reference System-Related Commands OUTPREL commandSYSTemERRor? +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 SCPI Status System Binary Weight 20 = 21 = 22 = 23 = 24 = 25 = 26 = 27 = 28 = 29 = 210 =Chapter 4 Remote Interface Reference The SCPI Status Registers 211 = 212 = 213 = 214 = 215 =The Questionable Status Register The Standard Event Register Execution Error. An execution error occurred see errorCommand Error. A command syntax error occurred see Power On. Power has been turned off and on since theThe Status Byte Register The Standard Event Enable register is cleared whenChapter 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 To Determine When a Command Sequence is Completed Using *OPC to Signal When Data is in the Output BufferStatus Reporting Commands Chapter 4 Remote Interface Reference 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? An Introduction to the SCPI Language SOURce CURRent currentMINMAXUPDOWN CURRent? MINMAX CURRentTRIGgered currentMINMAX TRIGgered?MINMAX VOLTage voltageMINMAXUPDOWN VOLTage? MINMAX VOLTage TRIGgered voltageMINMAX TRIGgered? MINMAXCommand Format Used in This Manual Command Separators Using the MIN and MAX ParametersSCPI 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 APPLy voltageDEFMINMAX,currentDEFMINMAX APPLy? SECureCODE new code SECureSTATe OFFON,code SECureSTATe?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 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 ProgramsExample Program for C and C++ Chapter 6 Application Programs Example Program for C and C++Diode.c Continued on next page 135Chapter 6 Application Programs Example Program for C and C++ Continued on next page 136Continued on next page 137 Chapter 6 Application Programs Example Program for C and C++strcatVISAaddress,GPIBAddress strcatVISAaddress,INSTR void CheckErrorchar* pMessage if ErrorStatus VISUCCESS printf\n %s,pMessage ClosePort exit0void delayclockt wait Chapter 6 Application Programs Example Program for C and C++Example Program for Excel Chapter 6 Application Programs 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 Chapter 6 Application Programs Example Program for Excel Diode Macro Continued on next page 141Chapter 6 Application Programs Example Program for Excel Dim commandString As StringEnd of Program 142 Chapter 6 Application Programs Example Program for Excel Declaration for WindowsDeclaration 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 Output Characteristics, starting on page TutorialOverview of Agilent E3633A and Agilent E3634A Operation Figure 7-1. Diagram of Simple Series Power SupplyOPTICAL ISOLATION POWER SUPPLY OUTPUTCONTROL DISPLAY Output Characteristics Chapter 7 Tutorial Output CharacteristicsFigure 7-5. Output Characteristics Unwanted Signals Unregulated StateSources of Noise Figure 7-6. Simplified Diagram of Common Mode and Normal ModeE3633A E3634A Output Isolation Connecting the LoadMultiple Loads Remote Voltage Sensing Figure 7-7. Regulated Power Supply with Remote SensingLoad Consideration Chapter 7 Tutorial Connecting the Load Reverse Current Loading Series Connections Extending the Voltage and Current RangeParallel 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 Chapter 8 Specifications Performance Specifications Performance SpecificationsTable 1-1. Performance Specifications OVP and OCP Accuracy, ±% of output + offset Supplemental Characteristics Chapter 8 Specifications 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 Index U weight of power supply 167 wire rating wires sizesIndex unregulated state condition 151 up-programming responseCopyright 1998 Agilent Technologies All Rights Reserved DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN