Main Triggering Level Range. (Circle Denotes Triggering Limits.) - Tektronix 7B92A Maintenance Manual

b. Set the vertical
volts/division switch to 1 V.
c. Set the low-frequency sine-wave generator for
an eight-division display at 50 kHz. Center the display
vertically on the graticule.
d. 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. 5-11 for reference.
e. Check-set the MAIN TRIGGERING SLOPE to
and repeat part d for the negative slope of the waveform.
Performance Check/Calibration-7B92A
Fig. 5-11. Main Triggering level range. (Circle denotes
triggering limits.)
amplifier plug-in unit
Performance Check/Calibration-7B92A
f. Check-set the MAIN TRIGGERING SOURCE
to EXT and repeat part d of this step.
g. Check-set the MAIN TRIGGERING SLOPE to
+ and repeat part d for the positive slope of the
waveform.
B8. Preliminary Delayed Triggered Adjustment
a. Disconnect the 50-Ω cable from the MAIN
TRIG IN connector and reconnect it to the DLY'D TRIG
IN connector.
b. Set the 7B92A controls as follows:
MAIN TRIGGERING
SOURCE
MAIN TRIGGERING
LEVEL
Delayed Triggering +
SLOPE
Delayed Triggering AC
COUPLING
Delayed Triggering
SOURCE
Delayed Triggering
LEVEL
DELAY TIME MULT
TIME/DIV OR DLY TIME
DLY'D Time/Division
ALT
c. Adjust-Ext DC Bal, R225, Int DC Bal, R245,
and Trig Sens, R325, to midrange.
d. Adjust-Arming TD Bias, R345, and Gate TD
Bias, R355, fully clockwise.
e. Set the
volts/division switch to 50 mV.
f. Set the low-frequency sine-wave generator for
a four-division display at 50 kHz.
vertically on the graticule.
Intensified zone should start at the beginning of Delaying
(top) sweep.
g. Adjust-Gate TD Bias, R355, counterclockwise
until intensified zone moves to right and disappears.
5-27
INT
Near "O"
INT
"O"
1.0
20 µs
10, µs PULL FOR
vertical amplifier plug-in
Center the display
NOTE
unit