TB 9-6625-2088-24
Table 4. Frequency - Continued
Test instrument
Frequency counter indications
FREQ/PERIOD MULTI
Frequency dial
(Hz/s) switch settings
settings
Min
Max
100
2.0
4.85
ms
5.15
ms
1K
2.0
1.94
KHz
2.06
KHz
10 K
2.0
19.4
KHz
20.6
KHz
10 K
1.4
13.4
KHz
14.6
KHz
10 K
1.0
9.4
KHz
10.6
KHz
10 K
.6
5.4
KHz
6.6
KHz
10 K
.2
1.4
KHz
2.6
KHz
100 K
2.0
194
KHz
206
KHz
1M
2.0
1.94
MHz
2.06
MHz
10 M
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)
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.