Appendix Service Information
Constant Voltage (CV) Verifications
184
5 Readback the output voltage over the remote interface by sending the command:
MEAS:VOLT?
6 Record the value displayed on the controller. This value should be within the limit of
(DVM ±5 mV) for output1 or (DVM ±25 mV) for output2.
7 Program the output voltage to full scale rated value (20 V)
†
by sending the command:
VOLT 20.0
(E3646A model)
8 Record the output voltage reading on the digital voltmeter (DVM). The reading should
be within the limit of (20 V ± 20 mV)* or (60 V ± 40mV)** for output1, or (20 V ±
45 mV)* or (60 V ± 85mV)** for output2.
9 Readback the output voltage over the remote interface by sending the command:
MEAS:VOLT?
10 Record the value displayed on the controller. This value should be within the limit of
(DVM ± 15 mV)* or (DVM ± 35mV)** for output1, or (DVM ± 45 mV)* or (DVM
± 85 mV)** for output2.
11 Repeat steps (1) through (10) for the other output.
CV Load Effect (Load Regulation)
This test measures the immediate change in the output voltage resulting from a change
in the output current from full to no load.
1 Turn off the power supply and connect a digital voltmeter between the (+) and (-)
terminals of the output as shown in Figure A-1.
2 Turn on the power supply. Select the output to be tested and the high voltage range
(20V/1.5A)
†
, enable the output, and set the display to the limit mode. When the display
is in the limit mode, program the output current to the maximum programmable value
and the voltage to the full value (20.0 V)
†
.
3 Operate the electronic load in constant current mode and set its current to the (1.5
A)
†
. Check that the front panel CV annunciator remains lit. If not lit, adjust the load
so that the output current drops slightly until the
CV annunciator lights. Record the
output voltage reading on the digital voltmeter.
*For E3646A/48A models. **For E3647A/49A models.
†
For E3646A model, and see Table A-3 for other models.
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