TB 9-6625-1966-24
Table 3. Dial Accuracy - Continued
Test instrument
Frequency counter indications
RANGE
FREQUENCY
Min
Max
switch settings
dial settings
X1
5
196
ms
204
ms
X1
1
0.909
s
1.111 s
X10
1
90.9
ms
111.1 ms
X10
5
19.6
ms
20.4 ms
X10
10
9.90 ms
10.1 ms
X1K
10
9900
Hz
10,100
Hz
X1K
5
4900
Hz
5100
Hz
X1K
1
900
Hz
1100
Hz
X10K
1
8000
Hz
12,000
Hz
X10K
5
48,000
Hz
52,000
Hz
X10K
10
98,000
Hz
102,000
Hz
NOTE
No adjustments can be made in (8) and (9) above for TIs with
SN prefixed with 519, 533, 609, and 616.
(10) Set RANGE switch to X10K.
(11) Adjust A13C6 or A3C6 (fig. 2) until frequency counter indicates 100,000 Hz (R).
10. Distortion
a. Performance Check
(1) Connect audio analyzer to CHANNEL A OUTPUT.
(2) Set RANGE switch to X1K and FREQUENCY dial to 1.
(3) Measure distortion at 1 kHz. If audio analyzer does not indicate less than 1
percent distortion, perform b below.
(4) Set FREQUENCY dial to 10. Measure distortion at 10 kHz. If audio analyzer
does not indicate less than 1 percent distortion, perform (2) above and b below.
(5) Set RANGE switch to X10K. Measure distortion at 100 kHz. If audio analyzer
does not indicate less than 3 percent distortion, perform (2) above and b below.
minimum distortion less than 1 percent (R).
11. Dc Output Level
a. Performance Check
(1) Connect CHANNEL A OUTPUT to oscilloscope vertical input.
(2) Set RANGE switch to X100 and FREQUENCY dial to 10.
(3) Set oscilloscope VOLTS/DIV switch to 1. Adjust CHANNEL A AMPLITUDE
control for 7 major divisions of vertical deflection on oscilloscope.
