Tektronix 7B92A Maintenance Manual page 79

Fig. 5-12. Delayed Triggering level range.
denotes triggering limits.)
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
(Circle
INT
RUNS AFTER
DELAY TIME
10 ms
2 ms/PULL FOR ALT
1.0
amplifier plug-in unit
Performance Check/Calibration-7B92A
(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-Ω 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.)
j. Check-set the Delayed Triggering SOURCE to
INT and repeat part i of this step.
B16. Check AC LF Reject Operation
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
volts/division switch to 0.5 V.
c. Set the low-frequency sine-wave generator for
an eight-division display at 60 Hz. Center the display
vertically on the graticule.
d. Check-set the MAIN TRIGGERING LEVEL
control for a stable display (TRIG'D light on).
5-29
INT
near "0"
EXT
vertical amplifier plug-in unit