Tektronix 7B92A Maintenance Manual page 57

b. Set the 7B92A controls as follows:
MAIN TRIGGERING
COUPLING
Delayed Triggering
SLOPE
Delayed Triggering
COUPLING
Delayed Triggering
SOURCE
Delayed Triggering
LEVEL
TIME/DIV OR DLY TIME
DLY'D Time/Division
DELAY TIME MULT dial
c. Set the
volts/division switch to 0.2 V.
d. Set the low-frequency sine-wave generator for
a0.5 division (100 mV) display at 30 Hz.
e. Check-for stable display (TRIG'D light on) at all
settings of the 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 50-0 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 INT
SOURCE
Delayed Triggering near "O"
LEVEL
Delayed Triggering EXT
SOURCE
i. Check-for 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
+
AC
INT
RUNS AFTER
DELAY TIME
10 ms
2 ms/PULL FOR ALT
1.0
vertical amplifier plug-in
j. Check-set the Delayed Triggering SOURCE to
INT and repeat part i of this step.
A4. Check AC LF Reject Operation
a. Disconnect the 50-n cable from the DLY'D
TRIG IN connector and reconnect it to the MAIN TRIG IN
connector.
b.
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).
unit
e. Set the MAIN TRIGGERING COUPLING to AC
LF REJ; set the MODE to NORM.
f. Check-for no display (TRIG'D light off) when the
MAIN TRIGGERING LEVEL control is rotated throughout
its range.
g. Set the MAIN TRIGGERING COUPLING to AC;
set the SOURCE to EXT.
h. Reduce the output of the low-frequency sine-
wave generator to provide a six-division display (3.0 V) at
60 Hz.
(Adjust the MAIN TRIGGERING LEVEL control to
maintain a stable display.)
i. Set the MAIN TRIGGERING COUPLING to AC
LF REJ and repeat part f of this step.
A5. Check 20 MHz Triggering
a. Set
volts/division switch to 0.2 V.
b. Set the 7B92A controls as follows:
MAIN TRIGGERING AC
MAIN TRIGGERING AUTO
MAIN TRIGGERING INT
5-7
Performance Check/Calibration-7B92A
Set the vertical amplifier
the vertical amplifier
COUPLING
MODE
SOURCE
plug-in unit
plug-in unit