Wavetek 183 Manual page 6

Output
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).
Source
lmpedance: 50f).
Pulse
Output
Output voltage is TTL
compatible. Rise and
fall
times
are
typically 15
ns.
Sync is
normally
a
symmetrical
square
waveform;
with
SYMMETRY control ON,
it
is rectangular.
Sweep
Output
SWEEP OUT connector
provides
an
open
circuit
0
to +5 volt
(approximately) ramp
from a 600f,
impedance source.
DC Offset
DC offset
of \
, \
,
or
'1_, waveform,
or
DC if
selected, is
adjustable
to 110 volts open circuit
and +5 volts
into
a
50O load. Output current
is
limited to approximately
130 mA. Waveform + offset
is
limited to
t10V
into
an open
circu
it.
GCV Output
A
dc
voltage
proportional to
the instantaneous frequency
of
the
generator
output.
0 to +5V,
open
r:ircuit, 1
kS,
source impedance.
1.2.2
Operating Modes
Continuous
XCG Off
:
Operating as a
standard VCG (voltage controlled
generator), frequency
output
is
determined
by front
panel
control settings in conjunction
with
external control voltage
At VCG
I
N.
XCG
On:
Operates as
a
standard
VCG, except
output
of
main generator determined by dial
and
VCG input
voltage
is
in
25 harmonic-related frequencies
with
crystal
accuracy
on
X
10 range and above. Crystal
lock indicated by lighted
XCG lamp. Lock occurs at
every
mark on
dial (from
0.2 to
5 in
O.2 increments) and
for
the equivalent VCG voltages
plus dial.
Triggered
Only one complete cycle
of
output
appears
at 50fl
OUT
connector
for
each pulse applied to TRIG
lN
connector
(or
press
of
MAN
TR
I
G
switch
) .
Gated
Same
as triggered mode except
that output
oscillations
continue
for
duration
of
gating signal applied
to TRIG
lN
connector
(or
as
the
MAN TRIG switch is
depressed).
1-2
Sweep
The internal
ramp generator can
sweep
the
main
generator
up
in
frequency
with a
linear ramp. The end frequency
points may be individually
set
and the time
for
each
sweep
ramp can be varied
from
100s
to
1 ms.
xcG
GEN MODE switch
to
XCG gives
XCG mode.
When
dial
is
rotated
to
a calibration mark,
XCG lamp lights; generator
is locked
to crystal. There
are
25 XCG frequencies in
each
of
6
ranges
(XCG frequency
ranges
from 2
Hz
to 5
MHz).
XCG
frequencies available
with
VCG
voltages as
well
as
dial.
1.2.3
VoltageControlled Generator
VCG
Control Range: Up
to
1000:1 frequency
change
with
external voltage
input.
lnput
lmpedance: 5 kSr.
VCG Voltage:
0
to
5V.
VCG Slew
Rate:
2o/o
of range per
ps.
VCG
Linearity:
10.5%
for
0.0001
Hz
to 50 kHz.
1.2.4
Triggered Generator
Trigger pulse is 1V p-p to
t10V;
input impedance is
10kQ,
33 pF; minimum pulse width
is
50
ns;
maximum repetition
rate
is
5 MHz.
1.2.5
Horizontal
Precision
Dial Accuracy (Symmetrical Waveform)
XCG Off
:
!2o/o
of full
scale
for 0.005
Hz
to
5 MHz
!4o/o
of
reading and
t2% of full
scale
for 0.0005
to
0.005 Hz
XCG
On:
t0.01o/o
of
XCG setting
(when XCG lamp
is
on).
(X
10
range accuracy
must
be measured
over
a
10s
period.)
Frequency Vernier
Approximately
1o/o
of
range.
Vernier
affects
calibration of
frequency dial.
Time Symmetry
!10/o
for
0.005
to 500 kHz.
XCG Locking Time
Less
than 500
ms
for X
1
K thru
X
1M.
Less
than
5s
for X
100.
Less
than
50s
for X
10.