8 Service and Maintenance
218 E364xA User’s and Service Guide
CV PARD (ripple and noise)
Periodic and random deviations (PARD) in the output (ripple and noise) combine
to produce a residual AC voltage superimposed on the DC output voltage. CV
PARD is specified as the rms or peak-to-peak output voltage in the frequency
range from 20 Hz to 20 MHz.
Vrms measurement techniques
When measuring Vrms ripple and noise, the monitoring device should be plugged
into the front of the terminals at A in Figure 8-3. Use the BNC (female) receptacle
and the cable (BNC-to-BNC) to connect the monitor device to the power supply.
To reduce the measurement error caused by common mode noise, it is
recommended to twist the connection wire between the BNC receptacle and the
output terminals. The load resistor is connected to the terminal at B in Figure 8-3.
Twisted leads between the load resistor and the power supply help reduce noise
pickup for these measurements.
Figure 8-4 Front/rear panel terminal connections for the Vrms measurement
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 8-4.
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