Wavetek 188 - Specifications; Versatility

SECTION
I
GENERAL DESCRIPTION
1.1 THE MODEL 188
The Waveiek Model 188. 4 MHz
SweetVFunction
Generator, is
a
precision source of sine, triangle and
square waveforms plus
dc
voltage
Ail
waveforms
are
front panel variable from 4 mHz to 4 MHz and
can
be
internally or
externally modulated Frequencies are
variable linearly or logarithmically
within
a
frequency
range When used as a sweep
generator, an internal
ramp generator provides
a
recurring sweep over
a
1000:1
(linear) frequency range or 10.000:1
(logarithmic) frequency range Output can be con-
tinuous
O'
the
generator can
be
triggered or
gated by
an
external signal or
a
front panel switch Amplitude
of the waveforms is variable form 10V peak-to-peak in-
to 500
down to 15 mV peak-to^eak.
DC
reference of
the
waveform
can be
offset positively or negatively
The two
selectable waveform
outputs
are
a
20V peak-
to-peak maximum and
a
2V peak-to-oeak maximum
(20 dB
down from 20 Vp-p). both may be
varied over
a
30 dB
range Auxiliary
outputs
are
a
TTL level sync,
a
6000
sweep ramp and
a 6000
generator control
voltage signal whose level is proportional to the main
generator
frequency
1.2 SPECIFICATIONS
1.2.1
Versatility
Waveforms
Sine
%
.triangle
\
.square
'L
.TTl pulse n
and dc.
Operational Modes
Continuous:
Generator
runs
continuously
at
selected
frequency
Triggered: Generator is quiescent until triggered by
external signal or
manual trigger,
then
generates one
complete waveform cycle at
selected frequency.
Gated As triggered mode, except output continues
for duration of gate
signal
Las:
waveform started is
completed
Sweep An Internal ramp generator will sweep the
main generator from
a lower, start frequency to a
higher
stop
frequency, linearly
(3 decades) or
logarithmically
(4
decades)
Sweep Stop Frequency switches to high swoop limit.
Used to set high frequency limit.
Frequency
Range
0
004 Hz linear
(0
0004 Hz
k>g) to
4 MHz In 7 overlap-
ping decade ranges
xl
x
10
x 100
x IK
X10K
X100K
X
1
M
Function Output
'K* .
\
selectable
and variabio to 20 Vp-p
(10
Vp-p
into
50Q)
HI
output,
and
to 2 Vp-p (1 Vp-p
into
50Q) LO output Both outputs varied with
a 30 dB
ver-
nier.
Poak output current is 100 mA maximum (HI
out-
put)
into
500 (200 mApeak
into
a
short
circuit) Source
impedance is
50Q.
DC Offset and DC Output
Waveform offset and
dc output
selectable
and
variable
through HI and
LO BNC outputs DC output
selectable
by not selecimg a waveform function. HI
output
is
4 10V max (± 5V into 500) as offsot or Vdc output.
Signal-peak plus offset limited
to ±10V (±5V into
500). LO output
is
4
IV max
(±0.5V into 500) as is
signal-peak plus offset limit.
DC
offset plus waveform
attenuated
proportionately
at
LO
(
- 20
dB)
output.
TTL Sync Output
TTL pulse
(50% duty cycle) at
generator
frequency.
Drives
up to 20
TTL loads.
GCV
—
Generator Control Voltage
0 to 4.0V
open circuit output from
6000
source im-
pedance Proportional
to
frequency
of main
generator. For
use as a
horizontal drive signal.
0 004 (0 0004) to
4
Hz
0 04 (0.004) to
40 Hz
0 4 (0 04) to
400 Hz
4 (0.4) HZ to
4 kHz
40 (4)
HZ
to
40 kHz
400 (40)
Hz to 400 kHz
4 (0
4)kHz
10
4
MHZ
1-1