TB 9-4931-700-50
Test Instrument
Frequency Counter Indications
Frequency
FREQUENCY RANGE
Settings
Switch Setting
Minimum
Maximum
2
49.0196 ms
51.0204 ms
3
32.6797 ms
34.0136 ms
5
X10
19.6078 ms
20.4082 ms
7
14.0056 ms
14.5773 ms
10
9.8039 ms
10.2041 ms
1
9.80392 ms
10.2041 ms
2
4.90196 ms
5.10204 ms
3
X100
3.26797 ms
3.40136 ms
5
1.96078 ms
2.04082 ms
7
1.40056 ms
1.45773 ms
10
980 Hz
1020 Hz
1
980 Hz
1020 Hz
2
1960 Hz
2040 Hz
3
X1K
2940 Hz
3060 Hz
5
4900 Hz
5100 Hz
7
6860 Hz
7140 Hz
10
9.8 kHz
10.2 kHz
1
9.8 kHz
10.2 kHz
2
19.6 kHz
20.4 kHz
3
X10K
29.4 kHz
30.6 kHz
5
49.0 kHz
51.0 kHz
7
68.6 kHz
71.4 kHz
10
98.0 kHz
102.0 kHz
b. Adjustments
(1) Press FREQUENCY RANGE X10K pushbutton and adjust FREQUENCY
control for FREQ scale indication of 1.0.
(2) Adjust A12C2 (fig. 1) to obtain indication of 10.000 kHz (kilohertz) on
frequency counter (R).
(3) Adjust FREQUENCY control slowly clockwise while observing frequency
counter indication. If frequency increases, proceed to b(6) below. If frequency
decreases, proceed to b(4) below.
(4) Repeat (1) above.
(5) While observing frequency counter indication, adjust A12C2 (fig. 1) to obtain a
second 10 kHz output frequency (R). If a second 10 kHz cannot be obtained by adjusting
A12C2, readjust A12C2 to obtain original 10 kHz frequency. While observing frequency
counter indication, adjust A12L1 (fig. 1) in direction that causes output to decrease and
pass through 0 (zero) Hz (hertz) and increase to 10 kHz. Adjust A12L1 to obtain
indication of 10.000 kHz on frequency counter (R).
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