Agilent Technologies E3615A, E3614A, E3617A, E3616A PARDRipple and Noise, Pardrms Measurement

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Figure A-5. Load Transient Response Time Waveform

PARD(Ripple and Noise)

Definition: PARD is the Periodic and Random Deviation of the dc output voltage from its average value, over a specified bandwidth and with all other parameters maintained constant. Constant voltage PARD is measured in the root-mean- square(rms) or peak-to-peak(pp) values over a 20 Hz to 20 MHz bandwidth. Fluctuations below the lower frequency limit are treated as drift.

PARD(RMS) Measurement

The rms measurement is not an ideal representation of the noise, since fairly high output noise spikes of short duration could be present in the ripple and not appreciably increase the rms value.

Test Parameter:

Measured Variable: Output Voltage(rms)

Expected Results: Less than 200 μV rms

Test Procedure:

a.Connect the test equipment as shown in Figure A-6.

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.Check that the rms noise voltage at the true rms volt- meter is less than 200BμV.

Figure A-6. CV PARD RMS Measurement Test Setup

PARD(Peak-to-Peak) Measurement

The peak-to-peak measurement is particularly important for applications where noise spikes could be detrimental to a sensitive load, such as logic circuitry.

Test Parameter:

Measured Variable: Output voltage(peak-to-peak)

Expected Results: Less than 1 mV p-p (20 Hz-20 MHz)

Test Procedure:

A-5

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Contents April Agilent E361xA 60W Bench Series DC Power SuppliesSafety Summary Operating Instructions General Information Line Fuse Operating Temperature RangeMeter Programming Resolution Temperature CoefficientInitial Inspection InstallationInstallation Data Input Power RequirementsPower Cord TURN-ON Checkout ProcedureOperating Instructions Operation Beyond Rated Output Local Operating ModeConnecting Loads Operating ModesRemote Voltage Sensing Remote Operating ModesRemote Analog Voltage Programming Normal Parallel Operation MULTIPLE-SUPPLY OperationAUTO-PARALLEL Operation Gramming according to the remote-programming instructions Normal Series OperationTotal output voltage to ground must not exceed 240 Vdc AUTO-SERIES Operation= slave output voltage AUTO-TRACKING OperatonLoad Considerations Service Information Test Equipment Required MaintenanceOperation Verification Tests Performance Tests Type Required Characteristics USE Recommended ModelMeasurement Techniques Load Transient Response Time Constant Voltage CV TestsLoad Regulation Load Effect Line Regulation Source EffectPardrms Measurement PARDRipple and NoisePARDPeak-to-Peak Measurement CV Drift Stability Constant Current CC TestsCC Drift Stability Adjustment and Calibration ProcedureRegulating Loop Troubles TroubleshootingOverall Troubleshooting Procedure Reference and Bias CircuitOvervoltage Protection Circuit Troubles Symptom Checks and Probable CausesStep 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 Page Page Page Page Manual Supplement T E Constant Voltage ModeProgramming Voltage Common to the Minus Output Alternative Voltage Programming Using ResistorsProgramming Voltage Common to the Minus Output Constant Current with Voltage Programming Constant Current ModeCurrent Monitoring Remote Resistor Programming, Constant Voltage Remote Resistor Programming ConnectionsRemote Resistor Programming, Constant Current Certification Declaration of Conformity