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MODEL 8559A ADJUSTMENTS
ADJUSTMENTS
5
-
28. FREQUENCY RESPONSE ADJUSTMENTS (Cont'd)
11. Adjust Tuning Voltage Circuit GAIN control to expand the phase
-
locked display over 8 1/2 divisions on
CRT
(.01- 2.4 GHz). Refer to Figure 5
-
18b. It may be necessary to readjust OFFSET slightly to achieve
phase
-
lock over entire range.
12. Optimum phase
-
lock is indicated by a smooth trace over full swept frequency range on CRT and minimum
needle movement on synchronizer phase error meter.
13.
Place CRT trace in top division of display using analyzer REF LEVEL FINE control.
14. Change spectrum analyzer Amplitude Scale to 1
dB/DIV and adjust
REF
LEVEL FINE control to place
trace in upper half of display.
15. Remove CAUTION label (PC Board) from cover of A12 Step Gain by removing two pozi
-
drive screws.
16. Adjust
A12R72 V1 (bias) for maximum amplitude of trace on CRT
17. Adjust A12R47 1B (tilt) for best overall flatness of trace on CRT.
NOTE
Remember, you are viewing only a portion
(.01-2.4
GHz)
of Band
1.
The
remainder of Band
1
may have an effect on this adjustment.
18. Note highest and lowest points on CRT trace for reference. Also note level of trace at 2.1 GHz position on
CRT (8th vertical graticule line).
Highest Lowest 2.1
GHz
19.
Place sweep oscillator LINE switch
OFE
20. Disconnect cables from HP 86222A/B (.01- 2.4 GHz plug
-
in) and remove plug
-
in from sweep oscillator
mainframe.
21. Install HP
86290B (2
-
18.6 GHz plug
-
in) or
HP
86290B-H08 (2
-
22 GHz plug
-
in), if available, in sweep
oscillator mainframe and reconnect cables as shown in Figure 5
-
16 with 20 dB attenuator connected to
analyzer
RF
INPUT.
22. Set
RF
plug
-
in controls the same as for the pIug-in removed (refer to step 3) and select Band
4
(2
-
18.6 or
2
-
22 GHz) on sweep oscillator mainframe.
23.
Place
RF
plug
-
in RF OFF/ON switch ON. Change analyzer Amplitude Scale to 10 dB/DIY
24. Adjust sweep oscillator for swept output from 2 to 3 GHz.
25. Adjust spectrum analyzer TUNING controls for FREQUENCY GHz indication of 2.500 and change
FREQ
SPAN/DIV to 100 MHz. Make sure RES BW remains at 3 MHz.