TB 9-6625-2250-24
EXAMPLE:
(a) If the IF GAIN DEVIATION values in table 5 are: [REF LVL] -50 dBm = +0.2 dB
[REF LVL] -40 dBm = -0.3 dB
(b) IF GAIN CORRECTION formula listed in table 6 is: (-50) - (-40) =
(c) Substitute table 5 IF GAIN DEVIATION values for [REF LVL] settings into
formula: (-50) - (-40) = (+0.2) - (-0.3) = +0.5.
Table 5. IF Gain Deviation
Synthesizer/level
Test instrument
IF GAIN
[REF LVL]
Generator amplitude
MKR
DEVIATION
settings
settings
indications
(dBm)
(dBm)
Actual (dB)
Ideal (dB)
(dB)
+10
-10
0 (ref)
0 (ref)
0 (ref)
+5
-15
-5
0
-20
-10
-5
-25
-15
-10
-30
-20
-15
-35
-25
-20
-40
-30
-25
-45
-35
-30
-50
-40
-35
-55
-45
-40
-60
-50
-45
-65
-55
-50
-70
-60
-55
-75
-65
-60
-80
-70
-65
-85
-75
-70
-90
-80
-75
-95
-85
-80
-100
-90
(d) Then +0.5 would be recorded as IF GAIN CORRECTION (dB) factor in table 6
for [ATTEN] 20 dB setting. NOTE: Do not record EXAMPLE in table 6.
Table 6. Input Attenuator Accuracy (18 GHz)
Test instrument
IF GAIN
[ATTEN]
Step-to-step
MKR
Corrected MKR
CORRECTION
accuracy
settings
indications
indications
(dB)
(dB)
(dB)
(dB)
(dB)
10
0 (ref)
0 (ref)
0 (ref)
0 (ref)
20
(-50) - (-40) =
30
(-60) - (-40) =
40
(-70) - (-40) =
50
(-80) - (-40) =
60
(-90) - (-40) =
70
(-100) - (-40) =
(25) Repeat (24) above for each remaining IF GAIN CORRECTION listed in table 6.
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