TB 9-6625-1176-24
(g) WIDTH (duty cycle) VERNIER dial to 10.
(2) Connect OUTPUT to frequency counter A and B inputs, using adapter
(3) Set frequency counter to measure period and set PERIOD VERNIER for a
10,000 s frequency counter indication.
(4) Set frequency counter to measure pulse width and adjust R51 (fig. 1) for a 1000
s frequency counter indication (10 percent duty cycle) (R).
s
(5) Repeat technique of b (3) above and set PERIOD VERNIER for a 1000
frequency counter indication.
(6) Repeat technique of b (4) above and adjust R217 (fig. 1) for a 100 s frequency
counter indication (1 percent duty cycle) (R).
NOTE
Due to interaction between adjustments, repeat b (3) through
(6) above if necessary.
(7) Release DUTY CYCLE % pushbutton.
(8) Press WIDTH .1m-1m pushbutton and set WIDTH VERNIER dial to 10.
Adjust R216 (fig. 1) for a 1000 s pulse width indication on frequency counter (R).
(9) Set WIDTH VERNIER dial to 1 and adjust R128 (fig. 1) for a 100 s frequency
counter indication (R).
(10) Press PERIOD .1 -1 and DUTY CYCLE % pushbuttons. Adjust R197 (fig. 1)
for a 80 ns frequency counter indication (R).
Table 7. Duty Cycle Vernier Accuracy Check
Frequency counter indications
Test instrument
(ms)
WIDTH (duty cycle) VERNIER
Min
Max
dial settings
10
8.4
11.6
9
7.55
10.45
8
6.70
9.30
7
5.85
8.15
6
5.00
7.00
5
4.15
5.85
4
3.30
4.70
3
2.45
3.55
2
1.60
2.40
1
.75
1.25
11. Pulse Amplitude and Characteristics
a. Performance Check
(1) Position controls as listed in (a) through (g) below
(a) PERIOD 10 -.1m pushbutton pressed.