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Performance Verification
4–52
1780R-Series Service Manual
b. Select REF–INT on the 1780R-Series front panel. Adjust the generator
Linearity Rate control so the signal bounce rate is approximately two
seconds.
c. Set the 1780R-Series VAR/SLOW button to SLOW. Press the CON-
FIGURE button to On and select the PAGE 3 menu. Check that SLOW
SWEEP TRIG + is selected.
d. Check that the Waveform CRT display begins at maximum APL. (The
bright APL dot should be at the maximum APL level when the sweep
starts and then drop to the blanking level as the sweep moves across the
screen.)
e. Select SLOW SWEEP TRIG (minus) on the menu.
f. Check that the Waveform CRT display begins at the blanking level. (The
bright APL dot should be at the blanking level when the sweep starts and
then rise to the maximum APL level as the sweep moves across the
screen.)
g. Select SLOW SWEEP TRIG + on the menu. Turn the variable SWEEP
RATE control to obtain the slowest sweep.
h. Check that the sweep takes 12 seconds or more to move across the
Waveform CRT.
i. Turn the variable SWEEP RATE control to obtain the fastest sweep.
j. Check that the sweep moves across the screen in 4 seconds or less.
k. Set the VAR/SLOW button to Off. Press the CONFIGURE button to exit
the menu.
l. Disconnect the AC Bounce signal from the instrument.
46. Check Remote Sync Input
Requirement: Amplitude: 2.0 V to 5.0 V 100 kHz square wave or 4.0 V
composite sync.
a. Connect the Remote Sync Input Connector (see Figure 4–3) to the
1780R-Series REMOTE connector.
b. Connect a 4 V composite sync signal from the television test signal
generator to the Remote Sync Input Connector.
c. Connect a Color Bar signal, through a 75 W feed-through terminator, to
the CH A INPUT connector.
d. Check that the signal displayed on the Waveform CRT is locked.