TB 9-6625-1976-24
(6) Set MODE switch to STDBY.
Table 3. Frequency Accuracy
Test instrument
Frequency counter indications
FREQUENCY
FREQUENCY
RANGE-HZ
dials
switch settings
(Hz)
Max
Min
100
100.00
9.8912 ms
10.1112
ms
1K
0.5000 K
1.9763 ms
2.0243
ms
1K
1.0000 K
0.9891 ms
1.0111
ms
10 K
5.000
K
4.940
kHz
5.060
kHz
10 K
10.000
K
9.890
kHz
10.110
kHz
100 K
50.00
K
49.400
kHz
50.600
kHz
100 K
100.00
K
98.900
kHz
101.100
kHz
1M
0.5000 M
482.000
kHz
518.000
kHz
1M
1.0000 M
967.000
kHz
1.033000
MHz
b. Adjustments
(1) Connect true rms voltmeter to QUADRATURE OUT (rear of TI).
(2) Set true rms voltmeter FUNCTION pushbutton to FILT OUT.
(3) Connect frequency counter to COUNTER OUT (rear of TI).
(4) Set FREQUENCY RANGE-Hz switch to 1 M and FREQUENCY dials to
1.0520 MHz.
(5) If frequency counter does not indicate between 1.0420 and 1.0620 MHz, adjust
A10C41 and A10C45 (fig. 1) in equal amounts in the same direction until frequency counter
indicates 1.0520 MHz (R).
(6) If true rms voltmeter does not indicate between 9 and 11 V, adjust A10C41 and
A10C45 (fig. 1) in equal amounts in opposite directions until true rms voltmeter indicates
10 V (R).
NOTE
Interaction exists between (5) and (6) above; repeat until the
indications converge.
(7) Set FREQUENCY RANGE-Hz switch to 100 K and FREQUENCY dials to
80.00 kHz.
(8) If frequency counter does not indicate between 79.6 and 80.4 kHz, adjust
A10C42 (fig. 1) for a counter indication of 80 kHz (R).
6
