Node 29
FN
VU3
Tun
(Al4
FN VCO tuning voltage)
_
_
_
/
. . . . . .
. . .
.:..
Perform step
Al4
and then press
LMeas)
~~~~~~~‘;;~#
(29)
@J
c-1
~~~~~~~
Observe the
Al4
F’N
VCO tuning voltage. If the
Al3
and
Al4
assemblies are
functioning correctly and the VCO is phase locked, the trace should look
Iike
Figure 10-17. Any other waveform indicates that the FN VCO
is not phase
locked. The vertical
lines
in the trace indicate the band crossings. (The counter
can
also
be enabled to count the VCO frequency in CW mode.)
sg6274d
Figure 10-17. Analog Bus Node 29
1044
Service Key Menus and Error Messages
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