Tektronix 7B92A Maintenance Manual page 58

Delayed Triggering All pushbuttons in
COUPLING, SOURCE
and SLOPE
Delayed Triggering
LEVEL
TIME/DIV OR DLY TIME
DLY'D Time/Division
c. Disconnect the 50-n cable from the low-
frequency sine-wave generator and connect the medium-
frequency signal generator to the vertical amplifier plug-
in unit input using the 50-n cable.
d. Set the medium-frequency signal generator for
a 0.5 division display (100 mV) at 20 MHz.
e. Check-for a stable display (TRIG'D light on)
with the MAIN TRIGGERING COUPLING switch set to:
(1.) AC
(2.) AC LF REJ
(3.) DC
(Set the MAIN TRIGGERING LEVEL control as
necessary.)
f. Check-change
SOURCE to EXT and repeat part e of this step.
g. Disconnect the 50-n cable from the MAIN TRIG
IN connector and reconnect it to the DLY'D TRIG IN
connector.
h. Set the Delayed Triggering LEVEL control near
"O".
i. Set the MAIN TRIGGERING SOURCE to INT
and MAIN TRIGGERING COUPLING to AC.
j. Check-for a stable display (TRIG'D light on) with
the Delayed Triggering COUPLING set to:
(1.) AC
(2.) DC
k. Set the Delayed Triggering SOURCE to EXT
and repeat part j of this step.
I. Disconnect the 50-n cable from the medium-
frequency signal generator; disconnect the 50-n cable
from the bnc tee at the vertical amplifier plug-in input
connector.
RUNS AFTER
DELAY TIME
50 ns
5 ns/PULL FOR ALT
the MAIN TRIGGERING
Performance Check/Calibration-7B92A
A6. Check 180 MHz Triggering
a. Connect the high-frequency leveled sine-wave
generator to the bnc tee 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 amplifier
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 50-0 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 "O").
5-8
DC
EXT
2 ns
2 ns (knob in)
plug-in unit
the MAIN TRIGGERING
@