Trigger Sensitivity (Sn B070000-Above) - 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
5. Low-frequency sine-wave 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
VARIABLE (CAL IN)
DELAY TIME MULT
INTENSITY
CONTRAST
Delayed Triggering
LEVEL
SLOPE
COUPLING
SOURCE
TERM
A. TRIGGER SENSITIVITY
(For instruments SN B070000-above)
+
Midrange
AUTO
AC
INT
Midrange
20 Ps
10 ps/PULL FOR ALT
In
1.0
As desired
As desired
RUNS AFTER
DELAY TIME
+
AC
INT
Inputs
1 MΩ (in)
6. Time-mark generator
7. Plug-in extender
8. Tee connector, bnc
50 Ω cables (2)
9.
Vertical Amplifier Plug-In Unit
Position
Polarity
Input Coupling
Volts/Division
A1. Preliminary Main Triggering Adjustment
a. Connect the bnc tee connector to the input of
the vertical amplifier plug-in unit.
b. Connect a 50-Q cable from the low-frequency
sine-wave generator to the tee connector.
c. Connect a 50-Q cable from the tee connector
to the MAIN TRIG IN connector.
d. Set the oscilloscope intensity and focus
controls for the desired display.
e. Set the low-frequency sine-wave generator for
a four-division display at 50 kHz.
vertically on the graticule.
f. Adjust-Int DC Bal, R75, Ext DC BAL, R99, and
Trig Sens, R175, to midrange.
A2. Adjust Main Triggering Internal DC Balance
a. Set the MAIN TRIGGERING LEVEL control to
"O".
5-18
Performance Check/Calibration-7B92A
Center the display
Midrange
+ up
dc
50 mV