8 Service and Maintenance
Constant Current (CC) Verifications
204 E364xA User’s and Service Guide
Constant Current (CC) Verifications
Constant current test setup
Follow the general setup instructions in “General
measurement techniques” on page 194, and the specific
instructions will be given in the following paragraphs.
Current programming and readback accuracy
This test verifies that the current programming and GPIB or
RS- 232 readback functions are within specifications. Note
that the readback values over the remote interface should be
identical to those displayed on the front panel. The accuracy
of the current monitoring resistor must be 0.01% or better.
1 Turn off the power supply and connect a 0.01 Ω current
monitoring resistor (R
M1
) across the output to be tested
and a digital voltmeter (DVM) across the current
monitoring resistor (R
M1
) as shown in Figure 8- 2.
2 Turn on the power supply. Select the output to be tested
and the low voltage range (8 V/3 A) and then enable the
output by sending the following commands:
INST:SEL {OUT1|OUT2}
VOLT:RANG P8V (E3646A model)
OUTP ON
You should program the power supply over the remote interface for this
test to avoid round off errors.
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