TB 9-6625-1356-24
(4) Set FREQUENCY RANGE switch to X1M and turn FREQUENCY dial to 10.
(5) Adjust AMPLITUDE controls until multimeter indication equals:
A [(2B / 100) * A]
Where: A = value recorded in (3) above.
B = AC/DC test report correction in percent
Example: A = 7 mV
B = -0.1
7 - (0.002 x 7)
7 - (0.014) = 7.014 mV
(6) If TI meter does not indicate between -0.25 and +0.25 percent on expand scale,
perform b below.
(7) Repeat technique of (4) through (6) above for FREQUENCY RANGE and
FREQUENCY dial settings listed in table 6. TI meter will indicate between -0.25 and
+0.25 percent on expand scale.
Table 6. Expand Frequency Response
Test instrument
FREQUENCY RANGE
FREQUENCY
switch settings
dial settings
X1M
3
X1M
1
X100K
1
X10K
5
X10K
1
X10
5
b. Adjustments. Adjust A3C11 (fig. 2) for a 0 indication on TI meter expand scale (R).
12. Distortion
a. Performance Check
(1) Connect audio analyzer to TI using a 50 feedthrough termination.
(2) Position controls as listed in (a) through (c) below:
(a) FREQUENCY RANGE switch to X1K.
(b) FREQUENCY dial to 1.
(c) (Model 652A (SG-763/U)) OUTPUT MONITOR switch to NORMAL.
(3) Adjust AMPLITUDE controls for a 3.0 V indication on TI meter.
If audio
analyzer does not indicate less than 1 percent distortion, perform b below.
(4) Repeat (3) above at FREQUENCY RANGE switch and FREQUENCY dial
settings listed in table 7. Audio analyzer will indicate less than 1 percent distortion.
