TB 9-6625-1176-24
b. Adjustments
(1) Position controls as listed in (a) through (g) below:
PERIOD .1 -1 pushbutton pressed.
(a)
PERIOD VERNIER dial fully ccw.
(b)
PULSE POSITION 10n-.1 pushbutton pressed.
(c)
PULSE POSITION VERNIER dial to 1.
(d)
DUTY CYCLE % pushbutton pressed.
(e)
WIDTH 1 -10 pushbutton pressed.
(f)
WIDTH VERNIER dial to 1.
(g)
(2) Adjust R126 (fig. 1) for 12.5 MHz indication on frequency counter (R).
(3) Set PERIOD VERNIER dial to 1 and then to 10. If frequency counter does not
indicate between 8.9 and 11.1 MHz for vernier setting of 1, and between 0.8 and 1.2 MHz at
10, readjust R126.
(4) Position controls as listed in (a) through (e) below:
PERIOD 1m-1m pushbutton.
(a)
PERIOD VERNIER dial to 10.
(b)
PULSE POSITION 1 -.10 pushbutton pressed.
(c)
PULSE POSITION VERNIER dial to 1.
(d)
DUTY CYCLE % pushbutton released (out).
(e)
(5) Adjust R69 (fig. 2) for a frequency counter indication of 1000 s (R).
(6) Set PERIOD VERNIER dial to 1.
(7) Adjust R46 (fig. 1) for a frequency counter indication of 100 s (R).
(8) Set PERIOD VERNIER dial to 10 and repeat (5) through (7) above for best in-
tolerance condition.
9. Pulse Position
a. Performance Check
(1) Position controls as listed in (a) through (d) below:
PERIOD VERNIER dial to 10.
(a)
DUTY CYCLE % pushbutton pressed.
(b)
AMPLITUDE 1-3 pushbutton pressed.
(c)
PULSE POSITION VERNIER dial to 10.
(d)
(2) Connect TRIG OUTPUT to frequency counter A input, using 50
termination.
Connect OUTPUT to frequency counter B input.
NOTE
If an out-of-tolerance reading is obtained in (3) through (10)
below, perform b below.