Trigger Sensitivity - Tektronix 7B92A Maintenance Manual

Equipment Required
1. Oscilloscope
2. Wide-band vertical amplifier plug-in unit
3. High-frequency signal generator
4. Medium-frequency signal generator
Control Settings
Set the 7B92A controls as follows:
MAIN TRIGGERING
SLOPE
LEVEL
MODE
COUPLING
SOURCE
Sweep Controls
POSITION
TIME/DIV OR DLY TIME
DLY'D Time/Division
ALT
VARIABLE (CAL IN)
DELAY TIME MULT
TRACE SEP
INTENSITY
CONTRAST
Delayed Triggering
LEVEL RUNS AFTER
DELAY TIME
SLOPE
COUPLING
SOURCE
TERM
@
A. TRIGGER SENSITIVITY
+
Midrange
AUTO
AC
INT
Midrange
20 /s
10,us/PULL FOR
In
1.0
Clockwise
As desired
As desired
+
AC
INT
Inputs
1 M Ò (in)
Performance Check/Calibration-7B92A
5. Low-frequency sine-wave generator
6. Time-mark generator
7. Tee connector, bnc
8. 50 n cables (2)
A1. Check Main Triggering Level Range
a. Set the vertical amplifier plug-in unit controls as
follows:
Position
Polarity
Input Coupling
Volts/Division
b. Connect the bnc tee connector to the input of
the vertical amplifier plug-in unit.
c. Connect a 50-n cable from the low-frequency
sine-wave generator to the tee connector.
d. Connect a 50-n cable from the tee connector to
the MAIN TRIG IN connector.
e. Set the oscilloscope intensity and focus controls
for the desired display.
f. Set the low-frequency sine-wave generator for
an eight-division display at 50 kHz. Center the display
vertically on the graticule.
g. Check-that all levels of the positive slope may
be selected for the sweep starting point as the MAIN
TRIGGERING LEVEL control is rotated throughout its
range, and that triggering occurs at least 3.5 divisions
above and below the center horizontal graticule line.
See' Fig. 5-1 for reference.
h. Check-set the MAIN TRIGGERING SLOPE to
and repeat part g for the negative slope of the waveform.
5-5
midrange
+ Up
dc
1 V