PERFORMANCE TEST
4 - 5
4.3.2
Power supply
This test checks the proper operation of the power supply at all possible line
voltages.
Test equipment:
Variable voltage transformer (VARIAC)
Test set-up:
Settings/procedure:
1
-
Adjust the input line voltage to the oscilloscope (output from VARIAC) to a
desired value between 100 and 240V (rms), frequency 50...400 Hz.
2
-
Press POWER ON on the oscilloscope.
3
-
Apply the Probe Adjust signal from the front panel of the oscilloscope to
input CH1, e.g., by means of a 10:1 probe.
4
-
Press the green AUTOSET key.
Requirements:
1
-
Verify that the oscilloscope starts at any input voltage between 100 and
240V; in particular the line voltages 100, 120, 220 and 240V must be
checked.
2
-
Verify that the instrument’s performance does not change over the
indicated voltage range; and that the displayed Probe Adjust signal is
distortion-free and has equal intensity.
3
-
Press the ANALOG key (’DIGITAL MODE’ is displayed briefly), and verify
that the instrument’s performance does not change in digital mode at the
indicated line voltages (100, 120, 220 and 240V). The displayed Probe
Adjust signal must be free from distortion.
4
-
Press the ANALOG key (’ANALOG MODE’ is displayed briefly) to switch
to analog mode.
CH1
Probe
Adjust
CH2
CH3
CH4
OSCILLOSCOPE UNDER TEST
VARIAC
OUTPUT
TO MAINS
OSC POWER CORD
PROBE
MAT4127
9303