TB 9-6625-160-24
Table 23. OPT 015 or 055 (A WEIGHTING) Audio Filter.
Limits (dB)
Source
Frequency (Hz)
Minimum
Indicated
Maximum
20
-51.0
-50.0
25
-45.2
-44.2
31.5
-39.9
-38.9
40
-35.1
-34.1
50
-30.7
-29.7
63
-26.7
-25.7
80
-23.0
-22.0
100
-19.6
-18.6
125
-16.6
-15.6
160
-13.9
-12.9
200
-11.5
-10.5
250
-9.1
-8.1
315
-7.1
-6.1
400
-5.3
-4.3
500
-3.7
-2.7
630
-2.4
-1.4
800
-1.3
-0.3
1
k
-0.1
-0.1
1.25 k
+0.1
+1.1
1.6 k
+0.5
+1.5
2
k
+0.7
+1.7
2.5 k
+0.8
+1.8
3.15 k
+0.7
+1.7
4k
+0.5
+1.5
5k
0.0
+1.0
6.3 k
-0.6
+0.4
8k
-1.6
-0.6
10 k
-3.0
-2.0
12.5 k
-5.6
-3.3
16
k
-7.6
-5.6
20
k
-10.3
-8.3
b. Adjustments
NOTE
Perform paragraph 17 (Internal Reference Frequency
Adjustment) prior to any other adjustments as this has an
effect on all remaining adjustments. If already performed,
proceed as outlined below.
(1) Press TI numerical key for 41.0 and then SPCL key to initialize TI.
(2) Set TI INPUT and OUTPUT FLOAT switches to ground, and connect TI
OUTPUT HIGH connector to INPUT HIGH connector.
(3) Set TI SOURCE AMPTD for 1 V.
(4) Perform following steps for appropriate filters as required.
29