TB 9-6625-1356-35
(2) Position controls as listed in (a) through (d) below:
(a)
FREQUENCY RANGE switch to X1K.
(b)
FREQUENCY dial to 1.
(c)
(Model 652A) OUTPUT MONITOR switch to NORMAL.
(d)
OUTPUT ATTENUATOR switch to 3.0 VOLTS.
(3) Adjust AMPLITUDE controls for a 3.0 V indication on TI meter. If frequency
counter does not indicate between 980 and 1020 Hz, perform b below.
(4) Vary autotransformer output from 105 to 125 V and back to 115 V. Frequency
counter indication will remain between 980 and 1020 Hz.
(5) Repeat technique of (3) above for FREQUENCY RANGE and FREQUENCY
dial settings listed in table 3. If frequency counter does not indicate within limits specified,
perform b below.
Test instrument
Frequency counter indications
FREQUENCY RANGE
FREQUENCY dial
Min
Max
switch settings
settings
X10
1
9.70 Hz
10.31 Hz
X10
5
48.54 Hz
51.55 Hz
X10
10
97.08 Hz
103.09 Hz
X100
1
98.03 Hz
102.05 Hz
X100
5
490.19 Hz
510.20 Hz
X100
10
.980 kHz
1.02 kHz
X1K
5
4.90 kHz
5.10 kHz
X1K
10
9.80 kHz
10.20 kHz
X10K
10
98.00 kHz
102.00 kHz
X10K
5
49.00 kHz
51.00 kHz
X10K
1
9.80
kHz
10.20
kHz
X100K
1
98.00
kHz
102.00
kHz
X100K
5
490.00
kHz
510.00
kHz
X100K
10
0.98
MHz
1.02
MHz
X1M
10
9.70
MHz
10.30
MHz
X1M
5
4.85
MHz
5.15
MHz
X1M
1
0.97
MHz
1.03
MHz
b. Adjustments
(1) Remove TI bottom cover and oscillator shield.
(2) Connect multimeter with a 1 kΩ resistor in series between A2TP1 (fig. 1) and
chassis ground.
(3) Connect audio analyzer to TI using a 50 Ω feed-through termination.
6