1
SECTION
GENERAL DESCRIPTION
1.1 THE MODEL 182A
Wavetek Model 182A Four MHz Function Generator is
aprecision source of sine, triangle and square wave-
forms plus dc voltage. All are front panel variable from
0.004 Hz to 4MHz and can be externally modulated or
swept over a 1000:1 range. Output can be continuous
or the generator can be triggered or gated by an exter-
nal signal or afront panel switch. Amplitude of the
waveforms is variable from 10V peak-to-peak into 50Q
down to 30 mV p-p. DC reference of the waveforms
can be offset positively or negatively.
The main waveform output is 20V peak-to-peak maxi-
mum and can be varied over a30 dB range. Asecond
waveform at 2V peak-to-peak maximum (20 dB at-
tenuation) and aTTL level square at generator fre-
quency are auxiliary outputs. Inputs are provided for
external voltage controlled generator frequency (VCG)
and for triggering and gating the generator.
1.2 SPECIFICATIONS
1.2.1 Versatility
Waveforms
Sine %.triangle \.square 1i ,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. Last waveform started is
completed.
Frequency Range
0.004 Hz to 4MHz in 7overlapping decade ranges:
X1 0.004 Hz to 4Hz
X10 0.04 Hz to 40 Hz
X100 0.4 Hz to 400 Hz
X1K 4Hz to 4kHz
X10K 40 Hz to 40 kHz
x100K 400 Hz to 400 kHz
X1M 4kHz to 4MHz
Function Output
%,\,1, selectable and variable to 20V p-p
(10V p-p into 50Q) HI output, and to 2V p-p (1 Vp-p into
50Q) LO output. Both outputs varied with a30 dB ver-
nier. Peak output current is 100 mA maximum (HI out-
put) into 500 (200 mA peak into ashort circuit). Source
impedance is 500.
DC Offset and DC Output
Waveform offset and dc output selectable and variable
thru HI and LO BNC outputs. DC output selectable by
not selecting awaveform function. HI output is ±10V
max (±5V into 500) as offset or Vdc output. Signal-
peak plus offset limited to ±10V (±5V into 500). LO
output is ±1Vmax (±0.5V into 50Q) as is signal-peak
plus offset limit. DC offset plus waveform attenuated
proportionately at LO (-20 dB) output.
TTL Pulse Output
TTL pulse (50% duty cycle) at generator frequency.
Drives up to 20 TTL loads.
VCG —Voltage Controlled Generator
Up to 1000:1 frequency change with external to
±4V signal. Upper and lower frequencies limited to
maximum and minimum of selected range.
Slew Rate: 2% of range per jts.
Linearity:
±0.5% thru X100K range; ±2% on X1M range.
Input Impedance: 2kG.
Trigger and Gate
Input: TTL compatible levels.
Pulse Width: 50 ns minimum.
Repetition Rate: 4MHz maximum.
1.2.2 Frequency Precision
Dial Accuracy
±5% of full scale.
Time Symmetry
Square wave variation from 0.2 to 4.0 on dial less than:
±1% to 100 kHz; ±5% to 4MHz.
1.2.3 Amplitude Precision
Sine variation with frequency less than:
±0.2 dB on all ranges through X100K; ±1.0 dB to
4MHz.
1-1
