8 Service and Maintenance
Constant Current (CC) Verifications
208 E364xA User’s and Service Guide
5 Adjust the transformer to the low line voltage limit (104
Vac for nominal 115 Vac, 90 Vac for nominal 100 Vac, or
207 Vac for nominal 230 Vac). Record the output current
reading by dividing the voltage reading on the digital
voltmeter by the resistance of the current monitoring
resistor.
6 Adjust the transformer to 10% above the nominal line
voltage (127 Vac for a 115 Vac nominal input, 110 Vac for
a 100 Vac nominal input, or 253 Vac for a 230 Vac
nominal input). Record the current reading again
immediately by dividing the voltage reading on the digital
voltmeter by the resistance of the current monitoring
resistor. The difference between the current readings in
step 5 and step 6 is the load regulation current. The
difference of the readings during the immediate change
should be within the following limits:
CC PARD (ripple and noise)
Periodic and random deviations (PARD) in the output (ripple
and noise) combine to produce a residual AC current, as
well, as an AC voltage superimposed on the DC output. CC
PARD is specified as the rms output current in a frequency
range of 20 Hz to 20 MHz with the power supply in the
constant current operation.
E3646A E3647A E3648A E3649A
0.55 mA 0.33 mA 0.75 mA 0.39 mA
For better measurement results, it is recommended to make the
connection between the BNC receptacle and the output terminals as short
as possible, and to use the recommended split ferrites with the
BNC-to-BNC cable as shown in Figure 8-6.
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