Tektronix 7B92A Maintenance Manual page 81

d. Adjust the oscilloscope intensity control for
normal viewing.
e. Set the vertical
volts/division switch to 0.5 V.
f. Set the high frequency leveled sine-wave
generator for a one-division display at 180 MHz. Center
the display vertically on the graticule.
g. Set the MAIN TRIGGERING LEVEL control for
a stable display (TRIG'D light on).
h. Check-for a stable display with no more than
0.05 division of jitter.
i. Check-change
SOURCE to INT and repeat parts g and h of this step.
j. Disconnect the 50-Ω cable from the MAIN
TRIG IN connector and reconnect it to the DLY'D TRIG
IN connector.
k. Set the DLY'D Time/Division to PULL FOR
ALT; set the Delayed Triggering SOURCE to EXT.
I. Set the Delayed Triggering LEVEL control for a
stable display (near "0").
m. Check-for a stable display with no more than
0.05 division of jitter.
n. Check-change Delayed Triggering SOURCE to
INT and repeat m of this step.
B19. Check HF Sync Triggering
a. Disconnect the 50-Ω cable from the DLY'D
TRIG IN connector and reconnect it to the MAIN TRIG IN
connector.
b. Set the Delayed Triggering LEVEL control to
RUNS AFTER DELAY TIME.
c. Set the DLY'D Time/Division switch to Normal
mode (knob in).
d. Set the MAIN TRIGGERING MODE to HF
SYNC.
amplifier plug-in
the MAIN TRIGGERING
e. Set
volts/division switch to 1 V.
unit f. Set the MAIN TRIGGERING LEVEL control for
a stable display (TRIG'D light on).
g. Check-for a stable display with no more than
0.05 division of jitter.
h. Set the high-frequency leveled sine-wave
generator for a one-division display.
i. Check-change
SOURCE to EXT . 10 and repeat part g of this step.
j. Disconnect the 50-Ω cable from the high-
frequency leveled sine-wave generator.
B20. Check Line Triggering
a. Disconnect the 50-Ω cable from the MAIN
TRIG IN connector.
b. Set the MAIN TRIGGERING MODE to AUTO,
SOURCE to LINE, and COUPLING to AC; the TIME/DIV
OR DLY TIME switch to l ms; and DLY'D Time/Division
to 1 ms (knob in).
c. Check-set the MAIN TRIGGERING LEVEL
control near "0" and check that the TRIG'D light is on.
d. Check-that the display is not triggered (TRIG'D
light off) at either end of the MAIN TRIGGERING LEVEL
control rotation.
B21. Check Single Sweep Operation
a. Connect the time-mark generator to the input
of the vertical amplifier plug-in unit, using a 50-Ω cable;
set the generator for 1 ms markers.
b. Set the vertical amplifier plug-in unit deflection
factor for approximately two divisions of display; and
adjust MAIN TRIGGERING LEVEL control for a stable
display.
5-31
Performance Check/Calibration-7B92A
the vertical amplifier
the MAIN
plug-in unit
TRIGGERING