HP 3312A - Page 8

Section HI
3-2
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RANGE Hz
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AGCA ERE ERE
LOFFSET ONLY | ALE OUT |
OUTPUT
AMPLITUDE
VEANIER
LINE: $18 switch applies or removes ac power. The green
LED is lit when ON,
RANGE
Hz:
$1
through
$8,
pushbuttons
select
frequency
range.
RANGE
selection
times
the
reading
on
the
FRE-
QUENCY
dial
determines
the
output
frequency
of
the
* main generator.
FUNCTION:
interlocked
buttons
select
one
of
three
functions.
When
they
are
all
out,
the
de
level
may
be
set
accurately
(S9,$10,
$17).
FREQUENCY:
Sets
the
desired
frequency
within
the
range
of
any
of
the
RANGE
pushbuttons.
OFFSET:
R616
sets
the
de
operating
point
of
any
function,
CAL
position
removes
the
de
offset.
Eac
+
Ege
must
be
iess
than
10
V
or
clipping
of
the
waveform
will
Occur,
AMPLITUDE:
522,
R613{a)},
(b),
adjust
the
peak-to-peak
amplitude
of
the
waveform.
It
is
attenuated
in
steps
of
1:1,
10:1,
100:1,
1000-1;
the
VERNIER
adjusts
from
zero
to
maximum
output
volts
for
the
particular
range
selected,
SYM:
R608
varies
the
symmetry
of
output
waveforms
and
the
SYNC
output.
CAL
is
symmetrical.
0 ë .
SYNC:
A
square
wave
180
out
of
phase
with
the
main
generator,
Useful
for
synchronizing
external
instruments
or driving a counter.
OUTPUT:
Terminai
for
ail
main
generator
functions,
20
V
p-p
into
open
circuit
or
10
V
p-p
into
50
ohms,
in
the
7:7
attenuator
position.
Figure 3-1. Front Panel,
SYM
TRIGGER
PHASE
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Model 3312A
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TRIGGER PHASE: R615 sets the starting phase of the
output
signal
in
the
burst
mode.
FREE
RUN
disables
the
burst.
AM:
Selects
amplitude
modulation,
Functional
for
inter-
nal
or
external
modulation.
FM:
$13
selects
frequency
modutation.
Functional
for
|
internal
or
external
modulation.
SWP:
Si4
selects
sweep
mode.
This
function
overrides
AM
and
FM.
~
VW
TI,
:
$15, S16,
S17
select
the
modulating
function,
External
modulation
is
possible
when
all
but-
tons
are
out,
and
the
modulating
signal
is
applied
to
the
MOD
INT-EXT
jack,
%
AF
START:
R612
selects
the
percent
of
AM,
the
deviation
in
FM,
or
the
start
frequency
of
the
SWP.
RANGE
Hz:
R602,
$21
select
one
of
the
three
ranges
of
modulating
frequencies
with
continuous
control
within
each
range
via
the
VERNIER.
The
O
position
is
used
to
set
the
start
sweep
frequency.
MOD
INT-EXT:
Input
for
external
AM
or
FM,
Waveforms
of
the
modulation
generator
are
also
available
at
this
output
when
internal
moduiation
is
used.
SYM:
R601
varies
the
symmetry
of
the
modulation
output
waveform,
CAL
selects
a
90:10
ramp
for
SWP
and
symmetrical
for
all
other
functions.