Fluke PM3082 Service Manual page 433

PERFORMANCE TEST
6.3.6 Vertical deflection; deflection coefficients
The vertical deflection coefficients of channels CH1, CH2, CH3, and CH4 are checked by means of
a calibrated signal.
Test equipment:
Fluke 5500A mode: volt (Alternative: square-wave calibration generator PG 506)
Test set up:
5500A
SCOPE
OUTPUT
o
T
Settings/procedure:
1 - Apply a 1 kHz square-wave signal of 20 mV to input CH1. Set the generator in volt mode. The
generator must not be terminated with 50Q (the text 'LZ' must not be visible in the lower part
of the viewing area).
2 - Press the green AUTOSET key.
3 - Set CH1 to 5 mV/div and to DC input coupling. The waveform must be in the vertical middle of
the screen.
4 - Press the BWL key to activate the bandwidth limiter.
5 - Press menukey TRIGGER MTB and activate softkey 'noise on' and 'hf-rej'.
6 - Change the input voltage and the setting of CH1 according to table I and verify that the
amplitude of the signal agrees with this table. The signal should remain positioned in vertical
center of the screen.
Note: Only the input sensitivities are checked that are essential for instrument accuracy.
Requirements:
table I.
Input voltage (pp)
20 mV
50 mV
1V
5V
Repeat the settings/procedure in table I for CH2, CH3 and CH4. Use table II for CH3 and CH4 in
PM3092 and PM3082.
table II.
Input voltage (pp)
0.5V
2V
OSCILLOSCOPE UNDER TEST
/ ------------------------------
DH1
< Q O
^
___________
r
t
500 CABLE
Setting
5 mV
10 mV
0.2V
1V
Setting
0.1V
0.5V
\
f!H? P.H3 nKd
<0 J
O
T T
Requirements
3.94...4.06 div (+/-1.3%)
4.93...5.07 div (+7-1.3%)
4.93...5.07 div (+/-1.3%)
4.93...5.07 div (+/- 1.3%)
Requirements
4.93...5.07 div (+/-1.3%)
3.94...4.06 div (+/-1.3%)
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