8 Service and Maintenance
Constant Voltage (CV) Verifications
200 E364xA User’s and Service Guide
7 Repeat step 1 through step 6 for the other output.
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.
[2] For the E3646A/E3648A model.
[3] For the E3647A/E3649A model.
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