Agilent Technologies E3620A Service Manual download pdf (Page 11)

A-5

an ac voltage superimposed on the dc output. Constant Current

PARD is specified as the root-mean-square(rms) output current in e

frequency range of 20 Hz to 20 MHz with the unit in CC operation.

PARD(RMS) Measurement

Test Parameter:

Measured Variable: Output Current(rms)

Expected Results: Less than 200 uA rms

Test Procedure:

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

b. Turn the unit's power on and turn the VOLTAGE control fully

clockwise.

c. Turn up output current to the full rated value. Check that the

CC indicator remains lighted. Reduce CURRENT control if not

lighted.

d. Record rms voltage across R

and convert it to current through

dividing by R

e. Check that the rms noise current is no more than 200 uA.

PARD(Peak-to-Peak) Measurement

Test Parameter:

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

Expected Results: Less than 1 mA p-p

Test Procedure:

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

replace the RMS voltmeter with oscilloscope.

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

c. Turn the unit's power on and turn the VOLTAGE control fully

clockwise.

d. Turn up output current to the full rated value. Check that the

CC indicator remains lighted. Reduce CURRENT control if not

lighted.

e. Record peak-to-peak voltage across R

and convert it to cur-

rent through dividing by R

. Check that the peak-to-peak noise

current is no more than 1 mA.

Figure A-6. RMS Measurement Test setup

CALIBRATION PROCEDURE

To calibrate ammeter and full scale current, connect test equipments

as shown in Figure A-7.

Figure A-7. Calibration in High Current Range

Calibration in High Current Range

a. Turn VOLTAGE and CURRENT control fully clockwise.

b. Set RANGE push button to high current range.

c. Turn on power supply and adjust R31 so that DVM indicates

exactly as follows (5% over rated current):

E3610A: 0.315 V E3611A: 0.158 V E3612A: 0.053 V

d. Adjust R3 on the display board so that the displayed value on

the front panel is equal to DVM value divided by R

e. While depressing CC SET push button, adjust R20 so that the

displayed value on the front panel is equal to DVM value

divided by R

Calibration in Low Current Range

a. Set RANGE push button to low current range.

b. Adjust R32 so that DVM indicates exactly as follows (5% over

rated current).

E3610A: 0.21 V E3611A: 0.089 V E3612A: 0.026 V

Calibration of VOLTS Meter

a. Disconnect the current shunt(R

) and connect DVM across out-

put of supply.

b. Set RANGE push button to low current range at no load.

c. Adjust VOLTAGE control till DVM indicates exactly as follows

(full rated voltage):

E3610A: 15 V E3611A: 35 V E3612A: 120 V

d. Adjust R10 on the display board so that the value of the front

panel display is the same as the value of DVM.

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Agilent Technologies E3620A Service Manual Page 11

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