TB 9-6625-2233-24
8. Frequency and Line Stability
a. Performance Check
(1) Connect SYNC OUT output to frequency counter using a 50 Ω feedthrough termination.
(2) Press pushbuttons as listed in (a) through (e) below:
(a) CALIBRATE (allow enough time to complete and verify AUTOCALIBRATED
is displayed).
(b) RESET.
(c) FREQUENCY.
(d) 19.
(e) ENTER.
(3) Frequency counter will indicate between 18.43 and 19.57 Hz.
(4) Record frequency counter indication.
(5) Adjust autotransformer for a 108 V output.
(6) Frequency counter will display within 0.1 percent of frequency recorded in (4) above.
(7) Adjust autotransformer for a 125 V output and repeat (6) above.
(8) Adjust autotransformer for 115 V output.
(9) Set TI for an output frequency of 1 MHz. Frequency counter will indicate
between 999 and 1001 kHz.
(10) Record frequency counter indication.
(11) Adjust autotransformer for a 125 V output.
(12) Frequency counter will display within 0.01 percent of frequency recorded in (10) above.
(13) Adjust autotransformer for a 108 V output and repeat (12) above.
(14) Adjust autotransformer for a 115 V output.
(15) Repeat measurements for frequencies and frequency counter indications listed
in table 3.
Table 3. Output Frequency Test
Test instrument
Frequency counter display indications
frequency
Min
Max
19.00 MHz
18.981000 MHz
19.019000 MHz
900.0
kHz
899.55
kHz
900.45
kHz
20.0
Hz
19.99
Hz
20.01
Hz
19.0
Hz
18.43
Hz
19.57
Hz
10.0
Hz
9.70
Hz
10.30
Hz
Hz1
970.87
ms
1030.9
ms
1.0
0.1
Hz
9.7087
s
10.309
s
0.02 Hz
48.544
s
51.546
s
1 Set
frequency counter for time measurement, DC coupling, single ON, Holdoff ON,
and press restart to begin measurement.
b. Adjustments. No adjustments can be made.
