TB 9-6625-2057-35
Table 4. Frequency Response
Test Instrument
RANGE
frequency
indications
switch
dial
recorded in
settings
settings
(3) through (5) above
X5
1
3
(5)1
X10
1
3
(5)
X100
2
4
(4)
X1K
5
4
(4)
X10K
5
4
(4)
X100K
1
4
(4)
X100K
12
5
(5)
1LOW
DIST values are in parenthesis.
(10) Set NORM/LOW DIST switch (rear panel) to LOW DIST.
(11) Repeat (7) through (9) above.
b. Adjustments. No adjustments can be made.
11. Distortion
a. Performance Check
(1) Connect 600 Ω output to audio analyzer using voltage divider and set audio
analyzer to measure distortion.
(2) Position controls as listed in (a) through (c) below:
(a)
RANGE switch to X100.
(b)
Frequency dial to 10.
(c)
NORM/LOW DIST switch to NORM.
(d)
Adjust amplitude control fully cw.
(3) If audio analyzer does not indicate > 60 dB down (see fig. 1 for dB and %
relationship), perform b below.
(4) Repeat technique of (2) and (3) above using RANGE switch and frequency dial
settings listed in table 5. Audio analyzer will indicate within limits specified.
Table 5. Distortion
Test instrument
Audio analyzer indications (dB)
RANGE
NORM DIST
LOW DIST
switch settings
switch settings
switch settings
Frequency dial settings
X5
2
-40
-50
X10
3
-44
-60
X10
10
-54
-60
X100
1
-54
-60
X1K
1
-60
-60
X1K
10
-60
-60
X10K
1
-60
-60
X10K
10
-60
-60
X100K
1
-60
-60
