TB 9-6625-1356-35
Table 8. Voltage Change vs. Attenuation Change Continued
Voltage difference (V)
Equivalent attenuation change in dB(c)
16.8
to 18.0
0.15
18.0
to 19.2
0.16
19.2
to 20.4
0.17
20.4
to 21.5
0.18
21.5
to 22.7
0.19
22.7
to 23.3
0.20
(13)
Refer to test report for attenuator and record the corrected attenuation value
for 60 dB. Designate this value as a.
(14) Repeat (3) above for 50 dB. Designate this value as b.
(15) Using formula: Attenuation (a-b) c, determine attenuation value. This value
will be within limits for the OUTPUT ATTENUATOR switch settings listed in table 9.
Test instrument
Attenuator value limits
OUTPUT ATTENUATOR
(dB)1
switch settings (dBm)
Min
Max
+10
9.90
10.10
(9.92)
(10.08)
0
19.90
20.10
(19.92)
(20.08)
-10
29.90
30.10
(29.92)
(30.08)
-20
39.90
40.10
(39.92)
(40.08)
-30
49.90
50.10
(49.92)
(50.08)
-40
59.90
(60.10
(59.92)
(60.08)
1Values
in parenthesis apply to Model 651B and 652A.
(16) Repeat (13) above for 40 dB. Designate this value as b.
(17) Repeat (15) above.
(18) Repeat technique of (16) and (17) above for each OUTPUT ATTENUATOR
switch setting listed in table 9. Attenuation value will be within limits specified.
NOTE
Value a will remain the same for each check.
b. Adjustments. No adjustments can be made.
15