Agilent Technologies 8590 Series Service Manual page 54

Making Adjustments
5. Crystal and LC Bandwidth Filter
26.Adjust A13C45 LC CTR for maximum signal at center-screen.
27.Move the short from A11TP10 and A11TP11 to A11TP12 and
A11TP13, then adjust A11C23 LC CTR for maximum signal at
center-screen.
28.Move the short from A13TP12 and A13TP13 to A11TP10 and
A11TP11, then adjust A13C45 LC CTR for maximum signal at
center-screen.
29.Move the short from A13TP10 and A13TP11 to A13TP12 and
A13TP13, then adjust A13C23 LC CTR for maximum signal at
center-screen.
30.Disconnect all the shorts from A11 and A13 bandwidth board
assemblies.
LC Amplitude
31.Press the following analyzer keys.
, 3,
BW MHz
, 2,
SPAN MHz
32.Press
AMPLITUDE
top graticule using the knob.
33.Press the following analyzer keys.
,
PEAK SEARCH
,
MKR FCTN MK TRACK ON OFF
, 100,
BW kHz
It may be necessary to occasionally recenter the 30 kHz bandwidth.
34.Adjust A11R26 LC and A13R26 LC equally for a MARKER ∆
amplitude of 0 dB. Each potentiometer should be adjusted to
accomplish one-half of the necessary increase in signal amplitude. If
A11R26 or A13R26 reaches its limit, recenter both potentiometers
and repeat step 31
35.Press ,
MKR FCTN
54
and adjust the signal level one division below the
MARKER ∆
(ON)
to step 35.
(OFF) on the analyzer.
MK TRACK ON OFF
Chapter 2