©
Digital Switch
When the digital switch
is
selected by
the
dial/digital
switch selector
@
the
index @ lights
and
the
frequency
output
is
determined
by the digital
switch and
the
FREQ
MUL T.
@
DC
OFFSET
Rotating
DC
OFFSET
clockwise
past
12
o'clock
offsets de
output
or
de
center
reference
of
the
out-
put
waveform positive;
when
counterclockwise,
negative. When
OFF,
the
de
output
is
signal
ground
or
the
output
waveform
is
balanced
around
signal
ground
(OV
in
figure 3-2).
TTL
PULSE
ov
I
__
_
__
I
TRIANGLE
SINE
SQUARE
®
®
3-2
w
1----1--
+--1---1
Figure 3-2.
Output
Waveforms
"v
• "v , G
and
DC
(Waveforms)
Sine
'\,
, triangle "v
and
square G waveforms
are selected by
the
larger
of
the
two
concentric
controls;
the
DC
position provides a de voltage out-
put
controlled
by
DC
OFFSET.
Outputs
appear
at
son
OUT
and
600n
OUT.
AMPLITUDE
Rotating
AMPLITUDE fully clockwise provides
maximum
peak-to-peak
output
at
son
OUT
and
600n
OUT; rotating counterclockwise gives
up
to
20dB
attenuation.
Also see ATTENUATION
@.
AMPLITUDE does
not
affect
de
offset
or
de
output.
ATTENUATION
With a
600n
load
on
the
600!1 OUT
connector
or
a 50!1 load on
the
50!1
OUT
connector,
output
voltage for each
attenuation
is:
Attenuation
0
20
40
60
Amplitude
Control
Full
cw
Full
ccw
10V p-p
1V P·P
100
mV p-p
10mV
p-p
1V p-p
100 mV p-p
10
mV
p-p
(Not specified)
@
Goon
OUT
and
son
OUT
Connectors
@)
600n
OUT
and
50n
OUT
provide variable fre-
quency and
amplitude
'\,
, "v , G and DC.
Maximumsignal
amplitude
is
10Vp-p with matching
loads (20V p-p
into
open
circuit).
TTL
OUT
Connector
A fixed amp I itude Transistor-Transistor Logic (TTL)
square pulse
train
of
the
output
frequency. (TTL
levels are
OV
to
0.4V
for
a logic low and 2.4V
to
5V for a logic high.)
The
output
can drive
up
to
20
TTL
loads.
The
pulse train can also be used as a
synchronizing reference
to
50!1 OUT and 600!1
OUT. Phase
of
output
waveforms relative
to
the
TTL
pulse
is
shown in figure 3-1.
@
REF
OUT
Connector
A fixed amplitude Transistor-Transistor Logic (TTL)
pulse train
of
1 MHz whose
orig~
an internal
clock oscillator or, if indicator
~
is
lit,
the
external reference signal
of
1 MHz.
@ EXT
REF
IN
Connector
Input
for a 1 MHz sine
or
square wave external ref-
erence clock signal.
The
signal
must
be
at
least
1 Vrms. Synthesizer
freque~
are referenced
to
this signal when indicator e
is
lit.
@ GCV OUT
Connector
DC
excursions
at
the
Generator
Controlled Voltage
output
(GCV OUT)
of
OV
to
about
2V proportion-
ally represents frequency within the range indicated
by
FREQ
MULT.
@ VCG
IN
Connector
DC
excursions
at
the
Voltage Controlled
Generator
input
(VCG
IN)
proportionally control frequency
within
the
range
determined
by
FREQ
MULT.
Positive voltage increases
the
frequency
set
by
the
dial
G)
; negative voltage decreases the frequency.
Use
in
function generator mode only.
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