Agilent Technologies Agilent E3616A Serials KR83502651 service manual Constant Current CC Tests

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a.Connect the test equipment as shown in Figure A-7.

b.Turn the supply's power on and turn CURRENT con- trol fully clockwise.

c.Turn up output voltage to the full rated value. Check that the supply's CV indicator remains lighted. Reduce VOLTAGE control if not lighted.

d.Set the oscilloscope to AC mode and bandwidth to 20 MHz.

e.Check that the peak-to-peak noise is less than 1 mV.

Figure A-7. CV PARD Peak-to-Peak Measurement Test

Setup

CV Drift (Stability)

Definition: The change in output voltage (dc to 20 Hz) for the first 8 hours following a 30-minute warm-up period with con- stant input line voltage, constant load resistance and constant ambient temperature.

Test Parameter:

Measured Variable: Output Voltage

Expected Results: Less than 0.1% plus 5 mV

Test Procedure:

a.Connect the DVM across Rs in Figure A-4.

b.Operate the electronic load in constant current mode and set its current to the full rated value of power sup- ply.

c.Turn the supply's power on and turn CURRENT con- trol fully clockwise.

d.Turn up output voltage to the full rated value as read on the digital voltmeter.

e.After a 30-minute warm-up, note the voltage on DVM.

f.The output voltage reading should deviate less than 0.1% plus 5 mV from the reading obtained in step e over a period of 8 hours.

CONSTANT CURRENT (CC) TESTS

CCSetup. Constant current tests are analogous to constant voltage tests, with the supply's output short circuited and the voltage set to full output to assure CC operation. For output current measurements the current monitoring resistor must be treated as a four terminal device. Refer to the "Measure- ment Techniques" for details. All constant current measure- ments are made in terms of the change in voltage across this resistor; the current performance is calculated by dividing these voltage changes by ohmic value of Rs.

Load Regulation (Load Effect)

Definition: CC Load regulation is the change in the steady state value of dc output current due to a change in load resistance from short circuit to full load or from full load to short circuit.

Test Parameter:

Measured Variable: Output Current

Expected Results: Less than 0.01% plus 250 μA

Test Procedure:

a.Connect the DVM across Rs in Figure A-4. Operate the electronic load in constant voltage mode and set its voltage to the full rated value of power supply.

b.Turn the supply's power on and turn VOLTAGE con- trol fully clockwise.

c.Turn up output current to the full rated value. Check that the AMPS display reads full rated values and CC indicator remains lighted. Reduce CURRENT control if not lighted.

d.Record the voltage across Rs and convert it to cur- rent by dividing this voltage by Rs.

e.Operate the electronic load in short (input short) mode.

f.When the reading settles, record voltage across Rs again and convert it current. Check that the two

recorded readings differ less than 0.01% of output current plus 250 μA.

Line Regulation (Source Effect)

Definition: Line regulation is the change in the steady state value of dc output current due to a change in ac input voltage from the minimum to maximum value(±10% of nominal voltage).

Test Parameter:

Measured Variable: Output Current

Expected Results: Less than 0.01% plus 250 μA

Test Procedure:

a.Connect the DVM across Rs in Figure A-4. Operate the electronic load in constant voltage mode and set its voltage to the full rated value of power supply.

b.Connect the supply to the ac power line through a variable autotransformer that set for low line volt- age(104 Vac for nominal 115 Vac, 90 Vac for nominal 100 Vac, and 207 Vac for nominal 230 Vac).

c.Turn the supply's power on and turn VOLTAGE con- trol fully clockwise.

d.Turn up output current to the full rated value. Check that the AMPS display reads full rated values and CC indicator remains lighted. Reduce CURRENT control if not lighted.

A-6

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Contents Agilent E361xA 60W Bench Series DC Power Supplies Safety Summary Operating Instructions General Information Operating Temperature Range Meter Programming ResolutionTemperature Coefficient Line FuseInstallation Installation DataInput Power Requirements Initial InspectionTURN-ON Checkout Procedure Power CordOperating Instructions IntroductionLocal Operating Mode Connecting LoadsOperating Modes Operation Beyond Rated OutputRemote Analog Voltage Programming Remote Operating ModesRemote Voltage Sensing AUTO-PARALLEL Operation MULTIPLE-SUPPLY OperationNormal Parallel Operation Normal Series Operation Gramming according to the remote-programming instructionsAUTO-SERIES Operation Total output voltage to ground must not exceed 240 VdcAUTO-TRACKING Operaton = slave output voltageLoad Considerations Service Information Operation Verification Tests MaintenanceTest Equipment Required Measurement Techniques Type Required Characteristics USE Recommended ModelPerformance Tests Constant Voltage CV Tests Load Regulation Load EffectLine Regulation Source Effect Load Transient Response TimePARDPeak-to-Peak Measurement PARDRipple and NoisePardrms Measurement Constant Current CC Tests CV Drift StabilityAdjustment and Calibration Procedure CC Drift StabilityTroubleshooting Overall Troubleshooting ProcedureReference and Bias Circuit Regulating Loop TroublesSymptom Checks and Probable Causes Overvoltage Protection Circuit TroublesStep Action Response Probable Cause Step Measure Response Probable Cause Replaceable Parts Table A-10. Replaceable Parts List Table A-10. Replaceable Parts List Contd R28,111 0698-3228 Resistor 49.9K +-1% .125W TF TC=0+-100 RESISTOR-VAR 10K +-10% ALL IC V RGLTR-FXD-POS 4.8/5.2V TO-220 PKG ALL DIODE-GEN PRP 180V 200MA DO-35 ALL Table A-11. Component Value Model Manual Supplement Constant Voltage Mode T EAlternative Voltage Programming Using Resistors Programming Voltage Common to the Minus OutputR1 and R2 should be in the 1KΩ to 100KΩ range 10-3 Constant Current Mode Constant Current with Voltage ProgrammingCurrent Monitoring Remote Resistor Programming Connections Remote Resistor Programming, Constant VoltageRemote Resistor Programming, Constant Current Certification Declaration of Conformity

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