8 Service and Maintenance
222 E364xA User’s and Service Guide
Constant Current (CC) Verification
Constant current test setup
Follow the general setup instructions in the “General measurement techniques”
on page 212, 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 low voltage range (8 V/3 A) and enable
the output by sending the following commands:
3 Program the output voltage to the full-scale rated voltage (8.0 V)
[1]
and the
output current to 0 A by sending the following commands:
– You should program the power supply over the remote interface for this test
to avoid round off errors.
INST:SEL {OUT1|OUT2}
VOLT:RANG P8V
(E3646A model)
OUTP ON
VOLT 8
(E3640A model)
CURR 0
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