TB 9-6625-2059-35
b. Adjustments
NOTE
See NOTE in figure 2, for access to adjustments.
(1) Connect multimeter to +11V TP (fig. 1) and chassis ground.
(2) Adjust +11 VOLT ADJ A4A2R43 (fig. 6) for an 11 V indication on multimeter (R).
(3) Adjust VERT CTR A4A2R30 (fig. 6) until bottom of trace indicates -109 dBm (R).
(4) Connect oscilloscope to INPUT TEST POINT (fig. 6).
(5) Adjust signal generator amplitude for -30 dBm.
(6) Adjust IF GAIN A4A2R4 (fig. 6) for 0.4 V p-p spike on oscilloscope (R).
(7) Adjust VERT GAIN A4A2R29 (fig. 6) for 30 dBm indication on TI (R).
(8) If bottom of trace does not indicate -109 dBm, repeat b (3) above.
(9) Adjust signal generator amplitude to -40 dBm.
(10) Adjust LOG LIN A4A2R5 (fig. 6) for a -40 dBm indication on TI. If a -40 dBm
indication cannot be obtained go on to next step (R).
(11) Adjust signal generator to -30 dBm and repeat b (7) through (10) above until no
further adjustments are required.
(12) Adjust signal generator amplitude for -60 dBm.
(13) Adjust AMP 1 GAIN A4A2R13 (fig. 6) for a -60-dBm indication on TI (R).
(14) Adjust signal generator amplitude for -90 dBm.
(15) Adjust AMP 2 GAIN A4A2R22 (fig. 6) for a -90-dBm indication on TI (R).
(16) Repeat b (12) through (15) above until no further adjustments are required.
(17) Adjust signal generator amplitude for -30 dBm and repeat b (7) through (16)
until no further adjustments are required.
18. Spectrum Analyzer
Centering and Bandwidth
a. Performance Check
If peak of signal strength is not aligned with center vertical graticule line 2 minor
divisions and end of trace is not aligned with right edge of bezel (5.4 divisions from center),
perform b (1) through (3) below.
(2) Adjust ANALY DISPR control fully cw. If peak of signal strength is not aligned
with center vertical graticule line within 2 minor divisions, perform b (1) below.
(3) Set FREQUENCY MHz switches to indicate 130 500 0. If signal strength peak
is not aligned with first vertical graticule line within 2 minor divisions, perform b (4)
below.