Technical data

8 Service and Maintenance
Constant Voltage (CV) Verifications
192 E364xA User’s and Service Guide
1 Turn off the power supply and connect the output to be
tested as shown in
Figure 8- 1 to an oscilloscope
(AC- coupled) between the (+) and (–) terminals. Set the
oscilloscope to the AC mode and bandwidth limit of
20 MHz. Connect a resistive load (13.5 Ω)
[1]
to the
terminal at (B) as shown in Figure 8- 3.
2 Turn on the power supply. Select the high voltage range
(20 V/1.5 A)
[2]
, 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- scale rated value (1.5 A)
[2]
and the voltage to the full- scale rated value (20.0 V)
[2]
.
3 Check that the front panel CV annunciator remains lit. If
it is not lit, adjust the load down slightly.
4 Note that the waveform on the oscilloscope does not
exceed the peak- to- peak limit of 5 mV
[3]
or 8 mV
[4]
.
5 Disconnect the oscilloscope and connect the AC rms
voltmeter in its place according to the Vrms measurement
techniques above and as shown in
Figure 8- 3. The rms
voltage reading does not exceed the rms limit of
0.5 mV
[3]
or 1 mV
[4]
.
NOTE
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 8-3.
[1] For the E3640A model. For other models, refer to Tabl e 8 -4 .
[2] For the E3640A model. For other models, refer to Tabl e 8 -5 .
[3] For the E3640A/E3642A/E3644A model.
[4] For the E3641A/E3643A/E3645A model.