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Wavetek 3000 - Subassembly Descriptions; C315 - Meter Board; Level Program Control

Wavetek 3000
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THEORY
OF
OPERATION
3
.2
.3
Subassembly
Descriptions
The
overall
block
diagram
discussed
in
this
sectiondescribes
basically
how
the
instrument
functions
as
a
unit
.
The
unit
is
made
up of
ten
moduleassemblies
and
three
printed
circuit
card
assem-
blies
.
These
can
be
identified
in
Fig
ure
5-6
.
Sections
3.3
thru
3
.15
de-
scribe
the
operation
of
each subassem-
bly
.
Thename
of
the subassembly_de-
scribes,
to
an
extent,
the
primary
func-
tion
it
performs
.
3
.3
C315
-
METERBOARD
Theprimary
function
of this
assembly
is to
provide
the
program voltage
to
the
levelercircuit
for the
RF
amplifier
.
It
also
includes
the
RF
output level
3.3
.1
LevelProgram
Figure
3-8
.
C315
-
Meter
Board
meterwhich
appearsthrough
the
instru-
ment
front
panel
.
SeeFigure
3-8
.
DuringCW operation
of
the
instrument,
the
level
program
is
controlled
by
the
VERNIER
on
the
frontpanel
.
The
output
of
this
control
goes
to
two
rangecali-
bration
circuits,
"High"and
"Low"
.
The
range
calibration
circuits convert
the
voltagefrom
the
VERNIER
to a
voltage
level
appropriate
to
drive
the
leveler
circuit
in
the
M10W
.
The
"Low"
circuitprovides
the
program
for all
ranges
of
the
detented
power
output
dial
except
+10dBm
.
At
"+10"
the
level
program
is
taken
from
the
"High"
circuit
.
The
"High"
level
program
enables
the
full gain
capabilities
of
the
M10W
to
be
used
when
the
output
is
not
amplitudemodulated
.
LEVEL
PF'Oc'
5=f%trl
TG
/N/UW

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