Agilent Technologies 66001A manual Output Rating, Output Noise, Parallel Operation

Page 23

Output Rating

The rated output voltage and current specified in Table 1-1 applies at the output terminals of the power module. With remote sensing, the power module must increase its output to compensate for voltage dropped in the load leads. If you attempt to provide full rated output voltage at the sense terminals (load), the power module’s output voltage may exceed its maximum rating. This may trip the OV protection circuit, which senses the voltage at the output terminals, or cause an unregulated output condition, particularly when the ac line voltage is low.

Output Noise

Noise picked up by the sense leads may appear at the output of the power module and can adversely affect the load regulation. To minimize noise pickup, twist the sense leads and route them parallel and close to the load leads. It may be necessary to use shielded sense leads in noisy environments. If you do, ground the shield only at the output connector ground screw. Do not use the shield as one of the sense leads.

Parallel Operation

Power modules may be connected in parallel to obtain increased output current. The power modules must be individually programmed; they do not function in the autoparallel mode that is commonly used by many Agilent power supplies.

Figure 2-5 shows two power modules connected in parallel. You must keep the same impedance to the load by using leads of equal length and wire size from each module to the load. Select one module (usually the one with the lesser current capacity) to operate in the "CV Mode". The other module then must operate in the "CC Mode" module. If you are using remote sensing, connect the sense leads to the module operating in the CV mode.

Since you must program one module to operate in CV mode and the other to operate in CC mode, refer to the output characteristic curve shown at the end of Chapter 1 to see what this means. Curve ￿ shows a module operating in CV mode; its output voltage remains constant over the range of its operating current. Curve shows a module operating in CC mode; its output current remains constant over the range of its operating voltage.

Figure 2-5. Connecting Power Modules in Parallel

For proper parallel operation, observe the following rules:

1.Program both module outputs OFF.

2.Program the CV mode module for the desired output voltage.

3.Program the CV mode module’s OVP voltage to the desired value; always higher than the output voltage.

4.Program the output and OVP voltages of the CC module slightly higher (about 1 volt) than those of the CV module. This is to ensure that the CC module stays in CC mode.

Installation 23

Page 22 Page 24
Image 23
Page 22 Page 24
Contents Agilent Part No Microfiche Part No September USER’S GuideCertification Safety Summary Manufacturers Declaration Symbol DescriptionPrinting History HerstellerbescheinigungModel Numbers a 66000A Manufacturer’s Name and AddressUSA Page Table of Contents Using the Agilent 66001A MPS Keyboard Basic Power Module CommandsGeneral Information Item DescriptionOption Description Accessories Readback Accuracy Specifications and Supplemental CharacteristicsProgramming Accuracy @ calibration temperature ± 5 C Output RatingsAgilent Model 66101A 66102A 66103A 66104A 66105A 66106A Performance Specifications ParameterSupplemental Characteristics Parameter Remote Sensing Capability 66101A 66102A Agilent Model 66103A 66104A 66105A 66106ADownprogramming Monotonicity Gpib Interface Capabilities Recommended Calibration Interval Safety ComplianceDimensions WeightParameter Agilent Model Number and Parameter Value Supplemental CharacteristicsOutput Characteristic Curve Replaceable Parts List Description Agilent Part NoPage Inspection InstallationSwitches Power Module Line Fuse and Switches Calibration Function Switches Remote Inhibit RI Function SwitchesSwitch Setting RI Action Display Function SwitchOutput Connector Installing The Module In The MainframeConnecting The Load AWG No. *Ampacity Selecting the Proper Wire SizeOutput Connections Resistance Ω/ftVoltage Readback Remote Voltage SensingParallel Operation Output RatingOutput Noise Voltprot Currlev MAX Outp on Outp OFFVoltlev Voltprot Currlev VoltlevCapacitive Loads Multiple LoadsOVP Considerations Connecting The ControllerBattery Charging Inductive LoadsModule Panel Display Power Module Front Panel DisplayTurn-On Checkout IntroductionAddr Dis Prot Power Module Turn-On StateChecking Basic Module Functions Mainframe Failure Module Output ConnectorError Messages Case Of TroubleDisplay Selftest Error MessagesRuntime Error Messages MessagesMPS Keyboard Basic Power Module CommandsSynopsis Of Commands Gpib ControllerPower Module Fixed-Mode Output Commands CommandPower Module Output Commands Function Power Module Protection Commands FunctionControlling Triggers Power Module List-Mode Output CommandsPower Module Trigger Commands Function Controlling List-Mode OutputDFI Output Commands Function Changing The Power On StateUsing the RI/DFI Functions RI Remote Inhibit Input DFI Discrete Fault Indicator Output CommandPerforming a Calibration Changing The Calibration PasswordCalibration Enabling Or Disabling The Calibration FunctionKeyboard Entry Controller Entry † Function Table A-2. Voltage Calibration ProcedureEquipment Required Calibrating VoltageCalcurrlev MAX Table A-3. Current Calibration ProcedureDisable the output Calcurrlev MINAgilent Basic Calibration Program Recovering The Factory Calibration ConstantsRecovering From a Lost Calibration Password Calibration Error Messages10 ! Voltage Calibration Program Assign Power Supply Gpib AddressInitialize Power Supply Password is Optional onlyPrint Current Calibration Complete END ifPrint Current Calibration not Saved ElseAgilent 66001A MPS Keyboard Using The Agilent 66001A MPS KeyboardConnecting The Keyboard Agilent 60001A MPS Keyboard Keyboard DescriptionMeter Area Annunciators System Keys  Letter Keys Displaying Status Using The DisplayChanging or Entering Values Command Example Sending Scpi CommandsQuery Example Error Example Scpi Command Tree Agilent 60001A MPS Keyboard Amps IndexAddr Prot UnrShift SRQ Tlk Lsn ProtMeas VOLT?, 32 Outp ScpiInit Agilent Sales and Support Office Agilent Sales and Support OfficesManual Updates
Top Page Image Contents