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Performance Verification
1780R-Series Service Manual
4–15
b. Select WAVEFORM GAIN–VAR. Check that RIGHT DISPLAY–WFM
and INPUT–CH A are selected.
c. Use the VERT POS control to position the waveform backporch or
blanking level to the graticule 0 IRE graticule line for NTSC (0.3 V for
PAL) on the Waveform CRT.
d. Turn the variable WAVEFORM GAIN control to obtain a minimum
(“beep” sound) amplitude display.
e. Check that the amplitude of the white bar is approximately 50 IRE for
NTSC (350 mV for PAL). See Figure 4–7.
f. Turn the variable WAVEFORM GAIN control to obtain a maximum
(“beep” sound) amplitude display.
g. Check that the burst amplitude is approximately 60 IRE peak-to-peak
(450 mV for PAL).
h. Set the WAVEFORM GAIN–VAR to Off.
i. Disconnect the Pulse & Bar signal from the instrument.