TB 9-6625-2112-24
WIDTH switch to 1 s.
(b)
AMPLITUDE VOLTS switch to 20 V.
(c)
AMPLITUDE VERNIER control fully cw.
(d)
PULSE POLARITY switch to NEG.
(e)
(2) Measure pulse width using standard measurement technique. If pulse width as
indicated on oscilloscope is not 50 ns or less, perform b (1) below.
(3) Position REPETITION RATE switch to 1 kHz, WIDTH switch to 100 s and
adjust vernier control fully cw. If pulse width as indicated on oscilloscope is not 100 s or
greater, perform b (2) below.
(4) Measure pulse width using settings listed in table 6. Oscilloscope indications
will be within limits specified.
Table 6. Pulse Width
Test Instrument
Width
Width vernier
Repetition
switch
control
rate switch
Oscilloscope
settings
positions
settings
indications
s
1 s or greater
cw
.1
MHz
1
s
1 s or less
ccw
.1
MHz
10
s
10 s or greater
cw
10
kHz
10
s
10 s or less
ccw
10
kHz
100
100 s or less
1 ms
ccw
1
kHz
1 ms
cw
.1
kHz
1 ms or greater
10 ms
ccw
.1
kHz
1 ms or less
Hz1
10 ms
cw
10
10 ms or greater
1 Some
models do not have a 10 Hz switch setting. Set REPETITION RATE vernier switch fully ccw.
CAUTION
To avoid overload, always decrease repetition rate before
increasing pulse width and decrease pulse width before
increasing repetition rate.
b. Adjustments
(1) Adjust R140 (fig. 2) for a pulse width indication on oscilloscope of 50 ns or less.
s
(2) Adjust R135 (fig. 2) for a pulse width indication on oscilloscope of 100
or greater.
11. Delay/Advance
a. Performance Check
(1) Connect equipment as shown in figure 3.