TB 9-6625-2333-24
EXAMPLE:
(a) If the IF GAIN DEVIATION values in table 8 are:
REF LVL -30 dBm = +0.2 dB
REF LVL -20 dBm = -0.3 dB
(b) IF GAIN CORRECTION formula listed in table 9 is: [(-30)-(-20)] =
(c) Substitute table 8 IF GAIN DEVIATION values for REF LVL settings into formula:
[(-30)-(-20)] = [(+0.2)-(-0.3)] = +0.5
(d) Then +0.5 would be recorded as IF GAIN CORRECTION (dB) factor in table 9 for
ATTEN 20 dB setting. NOTE: Do not record EXAMPLE in table 9.
Table 9. Input Attenuator Accuracy (2.9 GHz)
Test instrument
' MKR
' MKR
IF GAIN
ATTEN
Corrected
CORRECTION
settings
indications
indications
Limits
(dB)
(dB)
(dB)
(rdB)
(dB)
10
0 (ref)
0 (ref)
0 (ref)
0 (ref)
20
[(-30) - (-20)] =
0.6
30
[(-40) - (-20)] =
1.2
40
[(-50) - (-20)] =
1.8
50
[(-60) - (-20)] =
1.8
60
[(-70) - (-20)] =
1.8
70
[(-80) - (-20)] =
1.8
(25) Repeat (24) above for each remaining IF GAIN CORRECTION listed in table 9.
(26) Connect equipment as shown in figure 2.
Figure 2. Input attenuator accuracy (2.9 GHz) - equipment setup.
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