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Sect,IV
Page 16
4-19
CALIBRATE
RF
OUTPUT
METER
Set MODULATION
SELECTOR
= - - = - -
CW
ATTENUATOR
- - - ----
1 VOLT range
1) Connect AC Probe of Model 410B High Frequency
VTVM (1 volt range) to the end of the Output Termi-
nation.
Solder tip of 410B ac probe connector of
a UG-290/U
connector,
Clip ground lead of probe
to skirt of connector,
Insert connector into OUT-
PUT connector of Output Termination,
2) Set ATTENUATOR
VERNIER for 0.9 vrms out.
3) Rotate the FREQUENCY dial and RANGE switch
through all frequencies while observing the output
on the 410B and keeping the reading on the output
meter at 0.9 volts.
Record the lowest and highest
output,
4) Set the FREQUENCY dial to the frequency of the
highest
output
and
the ATTENUATOR
VERNIER
to 0.9 volt.
5) Add
one-half
of the difference
between
the
readings in step 3 to 0,9 volt.
6) Check
the output meter zero adjustment (see
paragraph 4-2,
Model 606A
7) Set the Model 410B to the reading obtained in
step 5 by adjusting the ATTENUATOR
VERNIER.
8) Set the output
meter
to read 0.9 volt by ad-
justing Output Cal. control (R73).
4-20
ADJUST
FEEDBACK
RELAY
Set ATTENUATOR
to 3 VOLTS,
Feedback relay
K1 should operate, increasing the output to 3 volts.
If the relay does not operate, complete the follow-
ing procedure.
1) Clip an @ Model 428A Clip-On Milliammeter
over the lead going to the coil of relay, Kl.
Ifa
Model
428A is not available, unsolder the lead and
insert a conventional 10 ma milliammeter,
2) Set ATTENUATOR
to 3 VOLTS
range.
The
current
through
the
relay
should
be a nominal
5.5 ma.
If the current
is not at least this value,
check
the
+300 volts supply and C26, C27, R27,
R28
and R46.
If this current does not operate the
relay, fix or replace the relay.
If the relay oper-
ates
but the output does not increase to 3 volts,
check
R25,
R26
and
the entire
feedback
loop.
SCHEMATIC
DIAGRAM
NOTES
1,
Heavy
solid
line
shows
main signal path;
heavy dashed line shows control, secondary
signal, or feedback path.
2.
Heavy box indicates front-panel engraving.
3.
Arrows
on
potentiometers
indicate
clockwise
rotation
as viewed
from the round shaft
end, counterclockwise from the rectangular shaft end.
4.
Resistance
values in ohms,
inductance in microhenries, and capacitance in micromicro-
farads unless otherwise specified.
5.
Rotary
switch
schematics
are
electrical
representations;
refer to the switch assembly drawings.
for exact switching details
6.
Relays shown in condition prevailing during normal instrument operation.
7.
t indicates a selected part.
See parts list.
8.
Interconnecting parts and assemblies are shown on cable diagram.
9,
* indicates factory adjustment.
Part may be omitted.
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