TB 9-4935-367-24
Table 3. Frequency Accuracy
Frequency counter indications
Frequency dial settings
Min
Max
500.0
kHz
499,000
Hz
501,000
Hz
100.0
kHz
99,800
Hz
100,200
Hz
10.00
kHz
9980
Hz
10,020
Hz
9.900
kHz
9880.2 Hz
9919.8
Hz
8.800
kHz
8782.4 Hz
8817.6
Hz
7.700
kHz
7684.6 Hz
7715.4
Hz
6.600
kHz
6586.8 Hz
6613.2
Hz
5.500
kHz
5489
Hz
5511
Hz
4.400
kHz
4391.2 Hz
4408.8
Hz
3.300
kHz
3293.4 Hz
3306.6
Hz
2.200
kHz
2195.6 Hz
2204.4
Hz
1.100
kHz
1097.8 Hz
1102.2
Hz
020.0
Hz
49.75 ms
50.25
ms
010.0
Hz
99.01 ms
101.01
ms
(5) Set frequency dials and VERNIER control for a 1,000,000 Hz indication on
frequency counter.
(6) Vary autotransformer between 105 and 125 V ac. Frequency counter indication
will remain between 999,900 and 1,000,100 Hz.
(7) Adjust autotransformer to 115 V.
b. Adjustments. No adjustments can be made.
9. Output Voltage and Meter Accuracy
a. Performance Check
(1) Connect OUTPUT to true rms voltmeter using voltage divider.
(2) Set OUTPUT ATTENUATOR switch to 10 V, frequency dials to indicate 400.0 Hz
and VERNIER control to centerline.
(3) Adjust AMPLITUDE control for an indication of 10 V on output meter. If true
rms voltmeter does not indicate between 9.8 and 10.2 V, perform b (1) and (2) below.
(4) Repeat technique of (3) above using output meter indications listed in table 4.
True rms voltmeter will indicate within limits specified.
Table 4. Output Voltage Accuracy
Output meter indications
True rms voltmeter indications
(V ac)
Min
Max
8
7.80
8.20
6
5.80
6.20
4
3.80
4.20
2
1.80
2.20
