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Performance Verification
4–20
1780R-Series Service Manual
1 to 1 ±0.005 (0.995 to 1.005). Ch A Input to Picture Monitor Output: 1 to 1
±0.02 (0.98 to 1.02).
a. Connect the VAC output to the 1780R-Series CH A INPUT connector.
Do not terminate. Check that the Black Burst signal is applied to the
EXT REF connector.
b. Check that the VAC output amplitude is set for 999.9 mV, the +Lum
button is pressed in, the Lum/Sync button is out, and the correct
television standard is selected.
c. Select INPUT–CH A. Check that the 1780R-Series front-panel controls
are set as follows: RIGHT DISPLAY–WFM+CAL, WFM HORIZON-
TAL–TWO–LINE, CONFIGURE–On, PAGE 1, DC RESTORER–OFF,
and CONFIGURE–Off.
d. Set the WAVEFORM GAIN to X5.
e. Select VAR and REL on the Waveform CRT menu.
f. Use the VERT POS control to position the center traces to the center of
the Waveform CRT graticule.
g. Turn the Precision Measurement control so the center traces are
overlayed and they appear as one trace.
h. Press the REFERENCE SET button so that the relative CAL readout is
100.0% on the Waveform CRT.
i. Move the VAC signal from the 1780R-Series CH A INPUT to the
CH B1 INPUT connector.
j. Select the 1780R-Series CH B1 INPUT and repeat part g. of this step.
k. Check that the relative CAL readout is 99.8% to 100.2%.
l. Move the VAC signal from the 1780R-Series CH B1 INPUT to the
CH B2 INPUT connector.
m. Select the 1780R-Series CH B2 INPUT and repeat part g.
n. Check that the relative CAL readout is 99.8% to 100.2%.
o. Move the VAC signal from the CH B2 INPUT to the CH B3 INPUT
connector.
p. Select the CH B3 INPUT and repeat part g.
q. Check that the relative CAL readout is 99.8% to 100.2%. After
completing this check, select FIX on the Waveform CRT menu.