TB 9-6625-2088-35
Table 4. Frequency Continued
Test instrument
Frequency counter indications
FREQ/PERIOD MULTI
Frequency dial
Min
Max
(Hz/s) switch settings
settings
100
2.0
4.85
ms
5.15
ms
1K
2.0
1.94
KHz
2.06
KHz
10K
2.0
19.4
KHz
20.6
KHz
10K
1.4
13.4
KHz
14.6
KHz
10K
1.0
9.4
KHz
10.6
KHz
10K
.6
5.4
KHz
6.6
KHz
10K
.2
1.4
KHz
2.6
KHz
100K
2.0
194
KHz
206
KHz
1M
2.0
1.94
MHz
2.06
MHz
10M
2.0
19
MHz
21
MHz
b. Adjustments
NOTE
Perform adjustments in order and repeat as required for best
intolerance condition.
(1) Set FREQ/PERIOD MULTI (Hz/s) switch to 1 K and frequency dial to 2.0.
(2) Adjust R4 (fig. 2) until frequency counter indicates between 1990 and 2010 Hz (R).
(3) Set FREQ/PERIOD MULTI (Hz/s) switch to 10.
(4) Adjust R48 (fig. 2) until frequency counter indicates between 19.9 and 20.1 Hz (R).
(5) Set FREQ/PERIOD MULTI (Hz/s) switch to 10M.
(6) Adjust C40 (fig. 2) for best intolerance condition while varying frequency dial
over entire range (R).
(7) Set FREQ/PERIOD MULTI (Hz/s) switch to 1 M.
(8) Adjust C34 (fig. 2) for best intolerance condition while varying frequency dial
over entire range (R).
13. Frequency Response
a. Performance Check
(1) Position controls as listed in (a) through (c) below:
(a) ATTENUATION switch to 20/0 and VERNIER control fully ccw.
(b) FREQ/PERIOD MULTI (Hz/s) switch to 1 kHz.
(c) Frequency dial to 2.0.
