TB 9-6625-2250-35
NOTE
If 18 GHz signal marker does not appear in (29) and (30) below,
repeat paragraph 8 a (1) and (2) above and perform adjustment
in 8 b (1) above.
(29) Press TI keys as listed in (a) through (c) below:
(a) MARKER PEAK SEARCH.
(b) INSTRUMENT STATE MIXER INT.
(c) [PRESEL AUTO PK] wait for PEAKING message to disappear.
(30) Adjust signal generator level output for a TI MKR indication between -12.95
and -13.05 dBm.
(31) Press TI keys and enter values using DATA keys as listed in (a) through (c)
below:
(a) MARKER ON.
(b) [MARKER DELTA].
(c) AMPLITUDE then [ATTEN] to 20 dB.
(32) Wait for completion of sweep. Record ∆ MKR indication for TI [ATTEN] 20 dB
setting in table 6.
(33) Repeat technique of (31) (c) and (32) above for remaining TI [ATTEN] settings
listed in table 6.
(34) Subtract IF GAIN CORRECTION from ∆ MKR indication and record results
as corrected ∆ MKR indication for each [ATTEN] setting listed in table 6. The corrected ∆
MKR indication will be between 3.5 and +3.5 dB for each setting.
(35) The step-to-step accuracy for TI [ATTEN] 20 dB setting is equal to the
MKR indication will be between -1.8 and +1.8 dB.
(36) Calculate the step-to-step accuracy for TI [ATTEN] 30, 40, 50, 60 and 70 dB
settings by subtracting previous [ATTEN] setting corrected ∆ MKR indication recorded in
Difference will be between -1.8 and +1.8 dB for each setting.
EXAMPLE:
(Current)
(Previous)
30 dB step-to-step
TI [ATTEN] 30 dB
TI [ATTEN] 20 dB
accuracy
=
(actual ∆ MKR indication
actual ∆ MKR indication)
-
b. Adjustments. No adjustments can be made.
12. IF Gain Uncertainty
a. Performance Check
(1) Connect equipment as shown in figure 4.
18 CHANGE 1
