1.1 THE MODEL 171
The Wavetek
Model
171
Synthesizer/Function
Generator
is
a precision source
of
sine,
triangle
and
square waveforms
and
de
voltage. The generator
combines
the
precision fre-
quency
of
a synthesizer with
the
versatility
and
operating
convenience
of
a function generator.
The
two
major modes
of
operation are synthesizer
and
function generator.
Function
generator
output
frequency can be varied from
0.1 Hz
to
2 MHz
in
seven ranges
manually
by
dial
and
re-
motely
by an applied
voltage. In
addition
to
this analog
control
of
frequency,
the
Model
171 has a
4
Yz
digit switch
for synthesizer control
of
function generator frequency:.
The
synthesizer gives precision (0.005%) frequency accuracy
and stability
(0.0001%/°C) from
1.000
Hz
to
1.9999
MHz
in
six ranges. When
the
synthesizer
is
used
to
set
the
fre-
quency,
in
addition
to
greater frequency accuracy and sta-
bility,
the
waveform
purity
is
improved over
that
of
the
function generator alone.
Amplitude
of
the waveform
is
continuously
variable
from
10V peak-to-peak
in
a matching
termination
load
(500
or
600n)
down
to
10
mV peak-to-peak
in
four ranges
of
at-
tenuation
(0, 20,
40,
60
dB).
DC
reference
of
the
waveforms
can be
offset
positively
and negatively.
The
synthesizer can
be locked
to
its own internal reference or
to
an
external
1 MHz reference.
1.2
SPECIFICATIONS
The
available waveforms, frequencies, amplitudes, operating
modes, precision (accuracy)
and
purity
(quality) are listed
in
the following paragraphs.
1.2.1
Versatility
Output
Signals
Sine
'\,
, triangle
"'\..;
, square
'L
and
DC
selectable. TTL
pulse
n.
,
1 MHz reference pulse
n.
and
GCV
signal
proportional
to
output
frequency are also available.
Control
Generator
operates
in
continuous
mode. Frequency
is
controlled
manually
by
dial
or
digital switch, or externally
thru
VCG
input
voltage. Digital switch
is
operable between
0.1000
and 1.9999 settings and works with
all
frequency
multipliers
except
X
1.
SECTION
1
INTRODUCTION
Frequency Range
0.1
Hz
to
2
MHz
in
seven overlapping ranges.
Operating Frequency Ranges
FREQMULT
Range
Digital
Resolution
x 1
0.1 Hz
to
2 Hz
N.A.
x
10
0.1 Hz
to
20
Hz
0.001
Hz
x
100
0.2
Hz
to
200
Hz
0.01
Hz
X1K
0.2
Hz
to
2 kHz 0.1 Hz
X 10K
20
Hz
to
20
kHz
1.0
Hz
X
100K
200
Hz
to
200
kHz
10
Hz
X1M
2 kHz
to
2 MHz
100Hz
NOTE
Digital switch valid
with
all
frequency multipliers
except X 1
(first
range). Frequency ratio
of
1000:
1 on dial,
20:
1
on
digital switch.
Main
Output
\;
,
"'\..;
,
1-i
;
variable
to
20V p-p into open circuit and
10V
p-p with
matching
load
at
either
50n
OUT
or
600n
OUT.
DC
offset
of
waveform
(or
DC
if selected)
is
adjustable
to
±10
volts
open
circuit and ±5 volts
into
matching
load.
Waveform
plus
offset
is
limited
to
±1
OV
peak (open circuit).
Output
waveforms can be
attenuated
from
0 dB
to
80
dB:
60
dB
in
20
dB steps
plus
a
20
dB
vernier for
continuous
variation
(20 dB vernier does
not
affect offset
or
DC
output).
Optional
output
protection circuit
of
zeners and fuses
protect
both
output
and
common
sides from inadvertent
connection
to
external voltage
or
ac line.
DC
Offset and
DC
Output
DC
offset
of
waveform and
DC
output
are selectable and
variable
thru
±10V
(±5V
into
matching load). Waveform
plus
offset
is
limited
to
±10V
peak (open circuit).
Step
at-
tenuator
attenuates
de
level.
Generator
Frequency TTL
Output
TTL
pulse has
an
approximately
50%
duty
cycle
at
gener-
ator
frequency and can drive up
to
20
TTL
loads.
Optional
TTL
buffer circuit provides high
power
TTL
com-
patible signal capable
of
driving load impedances
as
low
as
50S1.
1-1
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