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Performance Verification
4–30
1780R-Series Service Manual
c. Set the generator frequency to 50 kHz (reference). Set the generator
output amplitude so the waveform CRT display is exactly 714 mV or
100 IRE in amplitude for NTSC (700 mV for PAL).
d. Select FILTER–LUM mode.
e. Check that the displayed amplitude is between 707 mV and 721 mV or
99 IRE and 101 IRE for NTSC (693 mV and 707 mV for PAL).
f. Use the VERT POS control to position the bottom of the display to the
graticule baseline (0 IRE for NTSC; 0.3 V for PAL).
g. Set the generator frequency to 1 MHz.
h. Check that the displayed amplitude is equal to or greater than 500 mV or
70 IRE for NTSC (490 mV for PAL).
i. Set the generator frequency to 3.58 MHz (4.43 MHz for PAL).
j. Set the WAVEFORM GAIN to X5.
k. Check that the displayed amplitude is equal to or less than 36 mV or
5 IRE for NTSC (35 mV for PAL).
l. Set the WAVEFORM GAIN–X5 to Off and select the FILTER–LPASS
mode.
m. Set the generator frequency to 300 kHz.
n. Check that the displayed amplitude is equal to or less than 500 mV or
70 IRE for NTSC (490 mV for PAL).
o. Set the generator frequency to 500 kHz.
p. Check that the displayed amplitude is equal to or less than 143 mV or
20 IRE for NTSC (140 mV for PAL).
q. Set the generator frequency to 3.58 MHz (4.43 MHz for PAL).
r. Check that the displayed amplitude is equal to or less than 14.3 mV or
2 IRE for NTSC (14 mV for PAL).
s. Select FILTER–FLAT mode.
t. Set the generator output amplitude so the Waveform CRT display is
exactly 714 mV or 100 IRE in amplitude for NTSC (700 mV for PAL).
u. Select FILTER–CHROM mode.
v. Check that the displayed amplitude is between 707 mV and 721 mV or
99 IRE and 101 IRE for NTSC (693 mV and 707 mV for PAL).
w. Set the generator frequency to 2.98 MHz (3.83 MHz for PAL).