Technical data

Service and Maintenance 8
Constant Current (CC) Verifications
E364xA User’s and Service Guide 195
Constant Current (CC) Verifications
Constant current test setup
Follow the general setup instructions in the “General
measurement techniques” on page 185. Specific instructions
will be given in the following sections.
Current programming and readback accuracy
This test verifies that the current programming and GPIB or
RS- 232 readback functions are within specifications.
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- 1.
2 Turn on the power supply. Select the low voltage range
(8 V/3 A)
[1]
and enable the output by sending the
following commands:
VOLT:RANG P8V (E3640A model)
OUTP ON
NOTE
• 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.
• You should program the power supply over the remote interface for this
test to avoid round off errors.
[1] For the E3640A model. For other models, refer to Tabl e 8 -5 .