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ADJUSTMENTS
MODEL
8559A
ADJUSTMENTS
5
-
28. FREQUENCY RESPONSE ADJUSTMENTS (Cont'd)
26. Adjust Tuning Voltage Circuit GAIN and OFFSET controls to phase
-
lock swept signal from 2 to 3 GHz.
27. Adjust RF plug
-
in POWER LEVEL control to place trace at approximately
-
27 dBm on CRT.
28.
Change spectrum analyzer Amplitude Scale to 1
dB/DI\!
29. Adjust RF plug
-
in POWER LEVEL control to place 2.1 GHz position of CRT trace to same level as that
noted in step 18.
30. Note flatness of trace from 2 to 3
GHz. Total deviation of trace from .O1 to 3 GHz should not exceed 2.0
dB.
31. Center trace about the sixth horizontal graticule line on the CRT using analyzer REF LEVEL FINE
control. Do not change this setting for remainder of procedure. This will be used as amplitude reference
for remaining frequency bands.
NOTE
Be careful during the adjustment of the remaining frequency bands. It is
possible to achieve a phase
-
locked display of a frequency range other than
the one selected on the spectrum analyzer. For example, it is possible to
achieve a phase
-
locked display for 6
-
9 GHz when
3
-
9
GHz has been
selected. This can be avoided by paying close attention to synchronizer
polarity and RF plug
-
in band switch points. Figure 5
-
19 illustrates the typical
appearance of each of the bands. Use it for reference.
6 to 9
GHz Adjustment
32.
Change synchronizer POLARITY to
+
.
33.
Change spectrum analyzer FREQ
SPAN/DIV to F (full), Amplitude Scale to 10 dB/DIV, and FRE
-
QUENCY BAND GHz to 6
-
9. Set TUNING to above 9 GHz.
34. Adjust sweep oscillator for swept output from 6 to 9 GHz.
35. Adjust Tuning Voltage Circuit GAIN and OFFSET controls to phase
-
lock swept signal from
6
to 9 GHz.
Refer to Figure 5-19b.
36. Change spectrum analyzer Amplitude Scale to 1 dB/DIY
37. Adjust A12R58 2A (offset) and A12R48 2B (tilt) for best overall flatness of trace from 6 to 9 GHz with
trace approximately centered about the sixth horizontal graticule line on the CRT.
38.
Total deviation of CRT trace from 6 to 9
GHz should not exceed 2.0 dB.