TB 9-6625-2351-35
Table 4. Input Attenuator Accuracy - Continued
Synthesizer/level
Test instrument
[REF LVL]
[ATTEN]
∆ MKR indications
generator
settings
settings
amplitude settings
(dB)
(dBm)
(dBm)
(dB)
Min
Max
Actual
-20
-40
40
+28.2
+31.8
-10
-30
50
+38.2
+41.8
0
-20
60
+48.2
+51.8
+10
-10
70
+58.2
+61.8
(11) Repeat (8) through (10) above for remaining synthesizer/level generator
amplitude, TI [REF LVL] and [ATTEN] settings listed in table 4.
(12) Calculate the step-to-step accuracy for TI [ATTEN] 20 dB setting by subtracting
10 dB from the actual ∆ MKR indication recorded in table 4 for [ATTEN] 20 dB setting.
Difference will be between -0.6 and +0.6 dB.
(13) Calculate the step-to-step accuracy for TI [ATTEN] 30, 40, 50, 60 and 70 dB
settings by subtracting previous [ATTEN] setting actual ∆ MKR indication recorded in
table 4 from the
current [ATTEN] setting actual ∆
MKR indication recorded in
table 4 and
then subtract 10 dB from the results. Difference will be between -0.6 and +0.6 dB for each
setting.
EXAMPLE:
(Current)
(Previous)
30 dB step-to-step
TI [ATTEN] 20 dB
TI [ATTEN] 30 dB
accuracy
=
actual ∆ MKR indication) - 10 dB
(actual ∆ MKR indication
-
b. Adjustments. No adjustments can be made.
a. Performance Check
Figure 3. IF
gain uncertainty -
equipment setup.
(2) Press synthesizer/level generator keys to values listed in (a) through (c) below: