TB 9-6625-1176-24
Table 6. Pulse Width Continued
Frequency counter indications
( S)
Test instrument
WIDTH
VERNIER dial
Min
Max
pushbuttons
settings
1m - 10m
7
6200
7800
1m - 10m
6
5300
6700
1m - 10m
5
4400
5600
1m - 10m
4
3500
4500
1m - 10m
3
2600
3400
1m - 10m
2
1700
2300
(20) Set WIDTH (duty cycle) VERNIER dial to 2.5. Oscilloscope will display a pulse
width between 202 and 297 ns.
(21) Set WIDTH (duty cycle) VERNIER dial to 10. Oscilloscope will display a pulse
width between 840 and 1160 ns.
(22) Position controls as listed in (a) through (e) below:
PERIOD 10m-.1 pushbutton pressed.
(a)
PERIOD VERNIER dial to 10.
(b)
PULSE POSITION VERNIER dial to 10.
(c)
DUTY CYCLE .1-1 pushbutton pressed.
(d)
WIDTH (duty cycle) VERNIER dial to 1.
(e)
(23) Disconnect TI from oscilloscope and frequency counter and connect TI OUTPUT
t
to frequency counter A and B inputs, using adapter (calibration fixture) and 50
ermination.
(24) Using standard measurement technique measure pulse width.
Frequency
counter will indicate between 75 and 125 s (0.1 percent duty cycle).
(25) Set WIDTH (duty cycle) VERNIER dial to 10. Frequency counter will indicate
between 840 and 1160 s (1 percent duty cycle).
(26) Press DUTY CYCLE 1-10 pushbutton and set WIDTH (duty cycle) VERNIER
dial as listed in table 7. Frequency counter will indicate within specified limits.
(27) Set PERIOD VERNIER dial to 1. Frequency counter will indicate between 75
and 125 s.
b. Adjustments
(1) Position controls as listed in (a) through (g) below:
PERIOD 1m-10m pushbutton pressed.
(a)
PERIOD VERNIER dial to 10.
(b)
PULSE POSITION .1 -1 pushbutton pressed.
(c)
PULSE POSITION VERNIER dial to 1.
(d)
DUTY CYCLE % pushbutton pressed.
(e)
DUTY CYCLE 1-10 pushbutton pressed.
(f)
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