Wavetek 3000 - Option 1 A Maintenance; Option 1 A Schematics and Parts Lists

OPTION 1A
another voltagedivider in the "0 .1 dB
Program Select" circuit . Then, rear-
panel .8- .4-.2- .1 BCD input
activates
more FET switches to select
voltage
points
on this dividerwhich correspond to
0 .1
dB steps . The output of theFET
switches
is
connected
through Meter Board
relay
KIto the +10 dBm/0dBm level
circuitry
.
If amplitude
modulation input is applied
to Meter Board,
the modulation signal will
be
superimposed on the DC signal applied
to
voltage divider in the "1 dB Program
Select"
circuit, and thence on to the
"0 .1 dB Program Select" circuit . The
combined modulation/level program output
voltage
is applied to
Output Amplifier
through
the +10dBm/0dBm level circuitry .
MAINTENANCE
No calibrationor maintenance should be
required for this option, other
than
that described in previous sections of
this manual for calibration of the Meter
Board . However, if a malfunction of
some kind
should make it necessary to
repair the
boards, they can be safely
probed witha high impedance
probe such
as a scopeor DVM .

A logical
trouble-
shootingprocedure of
isolating the
faultshould be followed
. The integrated
circuits, whicharemost
vulnerable to
accidental shorts, are all
in sockets
for easyreplacements
.
SCHEMATICSAND
PARTSLISTS
This sectioncontains the wiring diagram,
schematics, and parts lists for Option
1A .