Technical data

1 Calibration Procedures
Constant Voltage (CV) Verifications
14 E3632A Service Guide
6 Adjust the autotransformer to high line voltage (127 Vac
for nominal 115 Vac, 110 Vac for nominal 100 Vac, or
253 Vac for nominal 230 Vac). Record the voltage reading
on the digital voltmeter immediately. The difference
between the digital voltmeter readings in steps 5 and 6 is
the CV line regulation. The difference of the readings
during the immediate change should be within the limit of
5 mV.
Normal mode voltage noise (CV ripple and noise)
The normal mode voltage noise is in the form of ripple
related to the line frequency plus some random noise. The
normal mode voltage noise is specified as the rms or
peak- to- peak output voltage in a frequency range from
20 Hz to 20 MHz.
1 Turn off the power supply and connect the output to be
tested as shown in
Figure 1- 1 to an oscilloscope
(AC coupled) between (+) and (–) terminals. Set the
oscilloscope to AC mode and bandwidth limit to 20 MHz.
Connect a resistive load (7.5 Ω) as shown in
Figure 1- 1.
2 Turn on the power supply. Select the 30 V/4 A range,
enable the output, and set the display to the limit mode.
When the display is in the limit mode, program the
current to the full rated value (4.0 A) and the voltage to
the full rated value (30.0 V).
3 Check that the front panel CV annunciator remains lit. If
not lit, adjust the load down slightly.
4 Note that the waveform on the oscilloscope does not
exceed the peak- to- peak limit of 2 mV.
5 Disconnect the oscilloscope and connect an AC RMS
voltmeter in its place. The rms voltage reading does not
exceed the rms limit of 0.35 mV.