Tektronix 7B92A Maintenance Manual page 73

A-13. Check 180 MHz Triggering
a. Connect the high-frequency leveled sine-wave
generator to the bnctee connected to the vertical
amplifier plug-in unit input.
b. Disconnect the 50-n cable from the DLY'D
TRIG IN connector and reconnect it to the MAIN TRIG IN
connector.
c. Set the 7B92A controls as follows:
MAIN TRIGGERING
COUPLING
MAIN TRIGGERING
SOURCE
TIME/DIV OR DLY TIME
DLY'D Time/Division
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
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").
DC
EXT
1 ns
1 ns (knob in)
amplifier plug-in
sinewave
the MAIN TRIGGERING
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.
A14. Check HF Sync Triggering
a. Disconnect the 50-n 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.
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-n cable from the high-
frequency leveled sine-wave generator.
A15.
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 1 ms; and DLY'D Ti me/Division
to 1 ms (knob in).
5-23
Performance Check/Calibration-7B92A
the vertical amplifier
the MAIN
Check Line Triggering
plug-in unit
TRIGGERING