TB 9-6625-2340-35
(117) Set TI LINE switch to STANDBY.
(118) Replace TI top cover.
14. Log Scale Switching
a. Performance Check
(1) Press TI 2-22 GHz key.
(2) Connect TI CAL OUTPUT to TI RF INPUT.
(3) Press TI keys as listed in (a) through (e) below:
(a) CENTER FREQUENCY, 100, MHz.
(b) FREQUENCY SPAN, 100, kHz.
(c) REFERENCE LEVEL, 8, -dBm.
(d) RES BW, 30, kHz.
(e) LOG ENTER dB/DIV, 1, dB.
(4) Press TI MARKER PEAK SEARCH and MARKER → REF LEVEL and
record the displayed marker amplitude in first row (Reference Indication column) of table
(5) Press the TI ⇑, and MARKER PEAK SEARCH keys and record displayed
amplitude level in table 10.
(6) Repeat (5) above for remaining log scales and calculate log scale deviation using
the formula below. If calculated deviation is not within limits specified in table 10, perform
b below.
Marker amplitude - reference indication = deviation
Test Instrument
(Reference
SCALE
MKR amplitude
indication)
Calculated deviation
(dB/div)
(dBm)
(dBm)
(dB)
Min
Max
1
(
)
0 (ref)
0 (ref)
2
(
)
0.5
-0.5
5
(
)
0.5
-0.5
10
(
)
-0.5
0.5
b. Adjustments.
(1) Set TI LINE switch to STANDBY.
(2) Remove TI top cover.
35
