Agilent Technologies Official Power Supply Manual for E3614A, E3615A, E3616A, and E3617A Models

e.Record output voltage across Rs and convert it to current by dividing this voltage by Rs.

f.Adjust autotransformer to the high line voltage (127 Vac for nominal 115 Vac, 110 Vac for nominal 100 Vac, and 253 Vac for nominal 230 Vac).

g.When the reading settles, record the 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.

PARD(Ripple and Noise)

Definition : The residual ac current which is superimposed on the dc output current of a power supply. Constant current PARD is specified as the root-mean-square(rms) output cur- rent in a frequency range of 20 Hz to 20 MHz with the supply in CC operation.

PARD(RMS) Measurement

Test Parameter:

Measured Variable: Output Current(rms)

Expected Results: E3614A: Less than 5 mA rms E3615A: Less than 2 mA rms E3616A: Less than 500 μA rms E3617A: Less than 500 μA rms

Test Procedure:

a.Connect the test equipment as shown in Figure A-8.

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 CC indicator remains lighted. Reduce CUR- RENT control if not lighted.

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

e.Check that the rms noise current is less than 5 mA rms for E3614A, 2 mA rms for E3615A and 500 μA rms for E3616A and E3617A respectively.

Figure A-8. CC PARD RMS Measurement Test Setup

CC Drift (Stability)

Definition: The change in output current for the first 8 hours fol- lowing a 30-minute warm-up with constant input line voltage, constant load resistance and constant ambient temperature.

Test Parameter:

Measured Variable: Output Current

Expected Results: Less than 0.1% plus 10 mA

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 the 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.

d.After a 30-minute warm-up, note the voltage on DVM and convert it to current by dividing this voltage by Rs.

e.The converted output current should deviate less than 0.1% plus 10 mA from the current obtained in step d over a period of 8 hours.

ADJUSTMENT AND CALIBRATION

PROCEDURE

Adjustment and calibration may be required after perfor- mance testing, troubleshooting, or repair and replacement. Perform those adjustments that affect the operation of the faulty circuit and no others. To remove the top cover, refer to "Line Voltage Option Conversion" paragraph.

Maintenance described herein is performed with power supplied to the supply, and protective covers removed. Such maintenance should be performed only service-trained personnel who are aware of the hazards involved (for example, fire and electrical shock). Where maintenance can be performed with- out power applied, the power should be removed.

Figure A-9. Calibration Test Setup

A-7