18
MODEL 144
FUNCTION GENERATORS
10 MHz Sweep Generator
Two Independent Generators
The Model 144 gives you two
independent generators, the main
function generator and an auxiliary
ramp generator. The auxiliary gen-
erator can sweep, trigger and gate
the main generator with controllable
sweep time and trigger and gate
repetition rates.
1000:1 Internal Sweep Capability
This dual generator instrument
features frequency sweep with ad-
justable sweep limits. Maximum
sweep ratio is 1000:1 on any range.
You can easily adjust the sweep rate
via a convenient front panel control,
from one sweep every one hundred
seconds to one sweep in one micro-
second. An external signal may also
be used to sweep the main generator.
Six Different Operational Modes
This versatile instrument has six
operational modes: continuous,
triggered, gated, continuous sweep,
triggered sweep and sweep-and-hold.
The waveform capability of this
generator meets a broad range of
laboratory signal requirements.
MODE
CONT SWP
GATED
TRIG
cont 7
— +
Internal or External Sweep Capability
Two Independent Generators
Six Different Operational Modes
Frequency From 0.0005 Hz to 10 MHz
Sweep or Generator Control
Voltage (GCV) Output
The versatile SWP/GCV output gives
you the maximum utility in sweep
function generator operation. When
the generator is being used in one
of the three internal sweep modes,
the output is a voltage proportional
to frequency, ideally suited as a
horizontal or X-axis drive for oscillo-
scopes or recorders. When the
generator is in the other modes, the
output is a fixed 5 volt sawtooth,
which can be used to trigger or tone
burst the main generator.
MODEL 144
HF SWEEP GENERATOR
OUTPUT ATTEN (dB)
SWEEP —30
18 У
7
SWP/GCV
OUT
19
MODEL 144
VERSATILITY
Waveforms
Sine V, square'l, triangle”,
positive pulse rt, negative pulse ur
and ramp 1.
Operational Modes
Continuous: Generator oscillates
continuously at selected frequency.
Triggered: Generator quiescent until
triggered by an external signal, then
generates one cycle at selected
frequency.
Gated: As triggered mode, except
generator oscillates for the duration
of the external signal.
Continuous Sweep: Recurring low-
to-hign frequency oscillation. Range
and rate selectable.
Triggered Sweep: Low-to-high fre-
guency oscillation with each trigger
input; then return to low frequency
after sweep.
Sweep-and-Hold: Sweep-to-high fre-
quency oscillation.
Frequency Range
+ 0.0005 Hz to 10 MHz in 10 overlapping
decade ranges with dial and frequen-
Cy vernier.
Main Output
NT A selectable and variable
to 30V p-p (15V p-p into 5092). n
and ır selectable and variable to
+ 15V peak (7.5V peak into 502). Pre-
cision output attenuator calibrated in
10 dB steps to 60 dB with 20 dB ver-
nier for overall attenuation of 80 dB.
Output impedance 50€2 .
DC Offset
Manual rear panel control. Waveform
offset at 5082 output between + 10 Vdc
(+5 Vdc into 50 2 ) with peak signal
and offset amplitude limited to
+ 15 Vdc into open circuit (x= 7.5 Vdc
into 50 £2). DC offset and output
waveform attenuated proportionately
by 60 dB output attenuator.
Sync Output
Greater than 4V p-p (2V p-p into 5092).
Rise and fall time less than 20 ns.
Square waveform for symmetrical
509 outputs; rectangular waveform
for pulse and ramp 50§2 outputs.
Sync pulse polarity opposite that of
50§2 output square wave.
Sweep
Sweep Time: 10 us to 100s.
Sweep Width: Up to 1000:1.
SWP/GCV Output
Ramp A output (0 to +5V fixed)
when in continuous, triggered or gated
mode. GCV output (0 to +5V maxi-
mum) proportional to frequency control
settings when in continuous sweep,
triggered sweep or sweep-and-hold
mode.
VCG — Voltage Controlled Generator
Up to 1000:1 frequency change with
external 0 to +5V signal. Upper fre-
quency is limited to maximum of
selected range.
Slew Rate: 2% of range per us.
Input Impedance: 5 kS2.
Linearity
+ 0.2% for 10 Hz to 100 kHz.
+ 0.5% for 0.001 Hz to 1 MHz.
Symmetry Control
Symmetry of all waveform outputs is
continuously adjustable from 1:19 to
19:1. Varying symmetry provides var-
lable duty cycle pulses, sawtooth
ramps and nonsymmetrical sine waves.
NOTE: When SYMMETRY control is used, indi-
cated frequency is divided by approximately 10,
Trigger and Gate
Input: 1V peak to peak min.
Impedance: 10 k§2.
Tone Burst Using Sweep Signal as Trigger
FREQUENCY PRECISION
Dial Accuracy
+ (1% of setting + 1% of full scale)
for 0.01 Hz to 1 MHz.
+ (2% of setting + 2% of full scale)
for 1 to 10 MHz.
Time Symmetry
+ 0.5% for 10 Hz to 100 kHz.
+ 1.0% for 0.01 Hz to 500 kHz.
FUNCTION GENERATORS
AMPLITUDE PRECISION
Amplitude Change With Frequency
Sine variation less than:
0.1 dB to 100 kHz.
0.2 dB to 1 MHz.
2.0 dB to 10 MHZ.
Amplitude Symmetry
All waveforms (except pulse) sym-
metrical within + 1%.
Step Attenuator Accuracy
+ 0.25 dB per 10 dB step.
WAVEFORM CHARACTERISTICS
Sine Distortion (Continuous Mode)
Less than:
0.5% for 10 Hz to 100 kHz.
1.0% for 100 kHz to 10 MHz.
All harmonics at least 30 dB down for
110 10 MHz.
Triangle Linearity
Greater than 99% for 0.0005 Hz to
100 kHz.
Square Wave Rise and Fall Time
Less than 20 ns terminated into 5082
load (limited to 500 V/ us).
Total Aberrations
Less than 5%.
GENERAL
Stability
Amplitude, frequency and dc offset.
Short Term: + 0.05% for 10 minutes.
Long Term: +0.25% for 24 hours.
Environmental
Specifications apply at 25°C +5°C.
Instrument will operate from 0°C to
+ 50°C.
Dimensions
21.6 ст (8% in.) wide: 13.3 cm
(5% in.) high; 29.2 cm (11% in.) deep).
Weight
4.1 kg (9 Ib) net; 5.9 kg (13 Ib) shipping.
Power
105 to 125V or 200 to 250V; 50 to
400 Hz; less than 40 watts,
NOTE: Specifications apply for frequencies obtained
when dial is between 1 and 10 with SYMMETRY
control to NORM. Symmetry and vernier affect
frequency calibration.
PRICE (FOB San Diego)
Model 144 $995
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