SECTION I
GENERAL DESCRIPTION
1.1 THE MODEL 188
The Waveiek Model 188. 4MHz SweetVFunction
Generator, is aprecision source of sine, triangle and
square waveforms plus dc voltage Ail waveforms are
front panel variable from 4mHz to 4MHz and can be
internally or externally modulated Frequencies are
variable linearly or logarithmically within afrequency
range When used as a sweep generator, an internal
ramp generator provides arecurring 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 afront 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 a20V peak-
to-peak maximum and a2V peak-to-oeak maximum
(20 dB down from 20 Vp-p). both may be varied over a
30 dB range Auxiliary outputs are aTTL level sync, a
6000 sweep ramp and a6000 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 alower, 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
0004 Hz linear (0 0004 Hz k>g) to 4MHz In 7overlap-
ping decade ranges
xl
x10
x100
xIK
X10K
X100K
X1
M
Function Output
'K* .\selectable and variabio to 20 Vp-p
(10 Vp-p into 50Q) HI output, and to 2Vp-p (1 Vp-p into
50Q) LO output Both outputs varied with a30 dB ver-
nier. Poak output current is 100 mA maximum (HI out-
put) into 500 (200 mApeak into ashort 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 awaveform function. HI output is
410V max (± 5V into 500) as offsot or Vdc output.
Signal-peak plus offset limited to ±10V (±5V into
500). LO output is 4IV 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
0to 4.0V open circuit output from 6000 source im-
pedance Proportional to frequency of main
generator. For use as ahorizontal drive signal.
0004 (0 0004) to 4Hz
0 04 (0.004) to 40 Hz
04 (0 04) to 400 Hz
4(0.4) HZ to 4kHz
40 (4) HZ to 40 kHz
400 (40) Hz to 400 kHz
4(0 4)kHz 10 4MHZ
1-1
