HP 3312A Service Manual

Modei 3312A
Section HI
SECTION IH
OPERATING
3-1. INTRODUCTION.
3-2. This section contains complete operating instructions
for the Model 3312A Function Generator. Included is a
brief description of the instrument, a description of
controls and connectors, general operating information, and
a basic operating procedure.
3-3. DESCRIPTION.
3-4.
The
3312A
Function
Generator
combines
two
sepa-
rate
function
generators
in
one
instrument
-a
main
genera-
tor
and
a
modulation
generator.
The
frequency
range
of
the
main
generator
is 0.1
Hz
to
13
MHz
in
eight
decade
ranges.
The
modulation
generator
frequency
range
is
0.01
Hz
to
10
kHz.
Both
the
main
generator
and
the
modulation
generator
provide
sine,
triangle,
square,
pulse
and
ramp
outputs.
The
symmetry
of
all
waveforms
can
be
varied
over
a
range
of
80:20
to
20:80
on
the
main
generator
and
is
set
at
10:90
on
the
modulation
generator.
3-5, The main generator can be modulated or triggered by
the modulation generator to provide AM, FM, sweep or
burst. The main generator can also be modulated by an
external source connected to the MOD connector on the
modulation generator. The frequency of the main generator
ean be externally controlled by applying an ac or dc voitage
to the VCO input.
3-6. The output attenuator has a range of more than
{000:1 so that output levels ranging from I mV p-p to
10 V p-p into 50 ohms can be obtained.
3-7.
The
3312A
has
a
de
offset
capability
which
allows
the
de
operating
point
of
the
main
generator
output
to
be
adjusted
from
-
10
V
to
+
10
V
de
(as
long
as
the
de
offset
plus
instantaneous
ac
does
not
exceed
+
10
V).
The
de
offset
can
be
adjusted
using
the
front
panel
OFFSET
control
or
set
to
OV
by
pushing
the
associated
CAL
button.
3-8. CONTROLS AND INDICATORS.
3-9.
Figures
3-1
and
3-2
illustrate
and
describe
the
function
of
all
front
and
rear
panel
controls,
connectors
and
indicators.
The
description
of
each
item
is
keyed
to
the
drawing
within
the
figure.
3-10. GENERAL OPERATING INFORMATION.
3-11. Grounding.
3-12. To protect operating personnel, the 3312A chassis
must
be
grounded.
All
Hewlett-Packard
instruments
are
equipped
with
a
three-conductor
power
cord,
which,
when
INSTI
U CTION
plugged
into
the
proper
receptical,
grounds
the
instrument.
The
offset
pin
of
the
power
plug
is
the
ground
connection.
All
input
and
output
commons
are
connected
directly
to
outer
chassis
(frame)
ground
through
the
offset
pin
on
the
power
cord.
The
outer
shells
of
all
input
and
output
BNC
jacks
are
connected
to
the
chassis.
To
protect
the
operator
from
electrical
shock,
DO
NOT
float
this
instrument.
3-13. Main Generator Outputs.
3-14.
The
main
generator
has
two
outputs,
a
main
signal
output
and
a
sync
output.
The
main
signal
output
(labeled
V
p-p)
provides
the
sine,
square
and
triangle
outputs.
The
sync
output
(Paragraph
3-19)
provides
a
pulse
which
can
be
used
for
external
timing
purposes.
Both
outputs
are
BNC
connectors
located
on
the
front
panel
of
the
instrument.
3-15. Main Signal Output.
3-16. The output of the main generator is de coupled to
supply
both
ac
and
de
components
of
the
output
wave-
form. The main generator output level is 10 V p-p into 50
ohms. The SYNC output level is .25 V p-p into 50 ohms.
Output
impedance
of
both
outputs
is
50
ohms
nominal.
3-17. Connections to this output should be made using
shielded cables equipped with BNC connectors. Table 3-1 is
a list of recommended -hp- cables. In order for the 3312A
to meet the specifications listed in Table 1-1, the main
signal output must be terminated into 50 ohms. The -hp-
Model 11048C 50 ohm Feedthru Termination is recom-
mended. Always place the termination at the load end of
the transmission line.
Table 3-4.. Cable Assemblies.
10502A 9" Cable Assembly
11086A 24” Cable Assembly
10519A 72” Cable Assembly
3-18. SYNC Output.
3-19. The SYNC output supplies a one volt rectangular
wave which is 180° out of phase with the main generator
output signal. The leading edge and the trailing edge of the
SYNC pulse occur at the zero crossing point of the output
waveform. The frequency and duty cycle of this pulse vary
with the main output signal.
3-1

HP 3312A Specifications

General

Brand	HP
Model	3312A
Category	Inverter
Language	English