Tektronix 7B92A Maintenance Manual page 71

Fig. 5-8. Delayed Triggering level range.
denotes triggering limits.)
d. Check-set the Delayed Triggering SLOPE to-
and repeat part c for the negative slope of the waveform.
e. Check-set the Delayed Triggering SOURCE to
EXT and repeat part c of this step.
f. Check-set the Delayed Triggering SLOPE to +
and repeat part c for the positive slope of the waveform.
A10.Check Low-Frequency Triggering
a. Disconnect the 50-) cable from the DLY'D
TRIG IN connector and reconnect it to the MAIN TRIG IN
connector.
b. Set the 7B92A controls as follows:
MAIN TRIGGERING
COUPLING
@
(circle
AC
5-21
Performance Check/Calibration-7B92A
Delayed Triggering
SLOPE
Delayed Triggering
COUPLING
Delayed Triggering
SOURCE
Delayed Triggering
LEVEL
TIME/DIV OR DLY TIME
DLY'D Time/Division
DELAY TIME MULT
c. Set the vertical
volts/division switch to 0.2 V.
d. Set the low-frequency sine-wave generator for
a 0.5 division (100 millivolts) display at 30 Hz.
e. Check-for a stable display (TRIG'D light on) at
all settings of the MAIN TRIGGERING LEVEL control
with MAIN TRIGGERING COUPLING set to:
(1.) AC
(2.) AC HF REJ
(3.) DC
(Set the MAIN TRIGGERING LEVEL control as
necessary.)
f. Check-set the MAIN TRIGGERING SOURCE
to EXT and repeat part e of this step.
g. Disconnect the 50-4 cable from the MAIN
TRIG IN connector and reconnect it to the DLY'D TRIG
IN connector.
h. Set the control settings as follows:
MAIN TRIGGERING
SOURCE
Delayed Triggering
LEVEL
Delayed Triggering
SOURCE
i. Check-for a stable display (TRIG'D light on) at
all settings of LEVEL controls with Delayed Triggering
COUPLING set to:
(1.) AC
(2) DC
(Set the MAIN and Delayed Triggering LEVEL controls
as necessary.)
+
AC
INT
RUNS AFTER
DELAY TIME
10 ms
2 ms/PULL FOR ALT
1.0
amplifier plug-in unit
INT
near "0"
EXT