Agilent Technologies E364XA Series, User Manual

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Appendix Service Information
Constant Current (CC) Verifications
188
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 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 (6) is the load regulation current. The difference of the readings should be
within the limit of:
7
Repeat steps (1) through (6) for the other output.
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 20 Hz to 20 MHz with the power supply in constant current
operation.
N o t e : For better measurement result, it is recommended to make the connection between
the BNC receptacle and the output terminals shorter as much as possible, and to use
the recommended split ferrites with the cable (BNC to BNC) as shown above.
E3646A E3647A E3648A E3649A
0.55 mA 0.33 mA 0.75 mA 0.39 mA
BNC Cable
Input
RMS voltmeter
Input
RMS voltmeter
(Front Panel Connections) (Rear Panel Connections)
Current
Monitoring
Resistor
BNC
Receptacle
Current
Monitoring
Resistor
Split
Ferrites