8 Service and Maintenance
Constant Voltage (CV) Verifications
196 E364xA User’s and Service Guide
Constant Voltage (CV) Verifications
Constant voltage test setup
If more than one meter or if a meter and an oscilloscope are
used, connect each to the (+) and (–) terminals by a
separate pair of leads to avoid mutual coupling effects. Use a
coaxial cable or a shielded 2- wire cable to avoid noise
pick- up on the test leads.
Voltage programming and readback accuracy
This test verifies that the voltage programming and GPIB or
RS- 232 readback functions are within specifications.
1 Turn off the power supply and connect a digital voltmeter
between the (+) and (–) terminals of the output to be
tested as shown in
Figure 8- 2.
Table 8 - 5 Verification programming values
Model Low voltage range High voltage range
E3646A 8 V/3 A 20 V/1.5 A
E3647A 35 V/0.8 A 60 V/0.5 A
E3648A 8 V/5 A 20 V/2.5 A
E3649A 35 V/1.4 A 60 V/0.8 A
• The readback values over the remote interface should be identical to
those displayed on the front panel.
• You should program the power supply over the remote interface for this
test to avoid round off errors.
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