THURLBY THANDAR INSTRUMENTS
TG300 Series
3MHz function and sweep/function generators
simultaneous display of frequency&litude
seven digit 120MHz external frequency counter
internal sweep generator, amplitude modulation
TG315, TG320, TG330 function generators
A state-of-the-art
instrument
The function generator is one of the most
versatile pieces of test &measurement in
strumentation available.
It can generate a variety of precision
waveshapes over a range of frequencies
from mHz to MHz. It can provide a wide
range of controlled amplitudes from a
low-impedance source, and maintain con
stantamplitudeasthe frequencyisvaried.
Voltage control of frequency enables a
source of swept frequency to be gener
ated for frequency response testing.
Modulation can also be added.
The TG300 series represents the stateof-the-art in low-cost analogue function
generators.
Exceptional waveform quality
The TG300 series provides very high
waveform quality under all conditions.
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That means low sinewave distortion, low
aberration triangle waves and fast-edged
square waves with low overshoot.
Unlike many competitive products good
waveform quality is maintained through
out the frequency range and at low output
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levels.
V ariab le symmetry for pulse
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and ramp wa v ef orms
The TG300 series provides bi-directional
variable symmetry from 1:9 to 9:1. Unlike
some products, frequency is independent
of symmetry setting.
Wide range level control
The TG300 series provides a main output
with a maximum emf of 20V pk-pk from a
50Ω or 600Ω source.
An amplitude vernier with a range of 20dB
is combined with two switched attenua
tors of -20dB and -40dB to provide levels
down to 2mV pk-pk unterminated.
Variable DCoffset of ±10V is available via
acentredetent control. Anauxiliary output
provides a fixed 0V to +5V level suitable
for driving both TTL and CMOS loads.
Wide sweep range
Each range can be swept by at least
1000:1 either manually or via the external
sweep input.
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0.03Hz to 3MHz frequency range
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Simultaneous display of frequency & amplitude
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External 7 digit 120MHz frequency counter (not TG315)
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Very high waveform quality at all frequencies & levels
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2mV to 20V pk-pk from 50 or 600
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Auxiliary TTL/CMOS output
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Variable symmetry with constant frequency
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Variable DC offset with zero detent
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1000:1 frequency change by vernier or sweep voltage
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Precision internal linear or logarithmic sweep (TG330)
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Internal or external amplitude modulation (TG330)
A choice of three models
TG315
The TG315 includes dual digital display
of frequency and amplitude, along with
the basic generator functions of sine,
square & triangle waveforms, variable
DC offset, variable symmetry and an ex
ternal sweep input.
TG320
The TG320 adds an external frequency
counter with up to 7 digits of resolution
covering 5Hz to 120MHz.
TG330
The TG330 has all the features of the
TG320 plus an internal sweep generator
with linear or log sweep, variable sweep
rate and a sweep output socket.
It also offers internal or external ampli
tude modulation.
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the highest waveform quality
the widest range of facilities
Dual digital displays for
precision & convenience
The TG300 series generators incorporate
a large dual-section digital display.
Unlike competitive products the display
provides a readout not just of frequency,
but of amplitude or offset simultaneously.
Fast and accurate frequency
measurement
Auto-ranging reciprocal measurement
gives 4-digit resolution with rapid update
rightdown to Hzlevels. Accuracyis within
±1 digit.
To maintain a fast update at sub-Hz
frequencies, the measurement mode is
changed resulting in3-digit resolution and
reduced accuracy.
However, when compared to the normal
fixed gate-timemeters used in other prod
ucts it provides both higher accuracy and
fasterdisplay updateacross thewhole frequency range.
Advanced internal sweep
The TG330 incorporates a versatile inter
nal sweep generator capable of providing
linear or logarithmic frequency sweeps.
Start and stop frequencies can be set with
precision using the digital display. Sweep
ranges of over 1000:1 are possible.
The sweep rate is adjustable over a wide
range with good setability between limits
of 20ms and 20s.
A sweep output socket is provided for use
withan oscilloscopeor an X-Y recorder. Un
like many other sweep generators, the
sweep ramp is triangular which gives a su
periordisplay when usingan oscilloscopeto
display swept frequencies.
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External counter with
seven digit resolution
The TG320 and TG330 have an external
counter mode which utilises the full width
of thedisplay to provide upto seven digits
of resolution.
The frequency range is from 5Hz up to
120MHz intwo ranges, and theinput sen
sitivity is better than 50mV rms.
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Ameasurementperiodof 0.5or5seconds
can be selected. A reciprocal counting
measurement system is used which en
sures high resolution regardless of input
frequency.
Thus, for example, mains frequency can
be measuredto a resolutionof better than
1mHz.
Accuracy is better than 10ppm (0.001%)
and an external adjustment point allows
for closed case re-calibration.
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RMS or peak to peak
amplitude display
Theoutput leveldisplaycan beselectedto
show any of three values:
1. The peak to peak amplitude
2. The RMS amplitude
3. The DC offset
RMS values are calculated correctly for
each waveform shape.
The decimal point and units are changed
automatically resulting in a display of the
true amplitude regardless of the attenu
ator setting.
A display indicator warns against illegal
combinations of offset and amplitude
setting that would create clipping in the
output stage.
TG330 in swept frequency mode.
Amplitude modulation for
extra versatility
TheTG330 alsoincorporates comprehen
sive AM facilities.
Themodulation canbe external or internal
(via a 400Hz internal generator) with
modulation levels fully variable between
0% and 100%.
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Built for the bench or rack
All three models are housed in the TTi
mid-size bench instrument case.
This heavy duty ABS case features an integral tilt stand and is 2U high for optional
rack mounting using an RM50 rack mount
kit.
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Technical Specifications
FREQUENCY
Frequency Range: 0.03Hz to 3MHz in 7 overlapping decade
Vernier Range: 1000:1 on each range.
ranges with fine adjustment by a vernier.
OPERATING MODES
Specificationsapplyforthetopdecadeofeachfrequencyrangeandmaximumout
put into 50
SINE
Distortion: <0.5% on 300, 3k and 30k ranges; <1% on
Amplitude Flatness: ±0.2dB to 200kHz; ±2dB to 3MHz.
TRIANGLE
Linearity: Better than 99% to 200kHz
SQUARE WAVE
Rise/Fall Times: <100ns
Mark - Space Ratio: 1:1 ± 1% to 100kHz
DC
Range: ±10V unterminated
SYMMETRY
Symmetry Range: Variable typically 1:9 to 9:1 (on top decade of
termination.
3, 30 and 300k ranges; all harmonics >25dB
below fundamental on 3M range.
each range), frequency divided by 10.
METER FUNCTIONS (generator mode)
Frequency: Auto-ranging reciprocal measurement giving
Amplitude: Display shows peak-to-peak amplitude or rms
DC Offset: 3-digit resolution; accuracy typically ±2% of
4 digit resolution for frequencies down to
1Hz; maximum resolution is 0.001Hz.
Accuracy ±1 digit for 0.2Hz to 3MHz.
Below 0.2Hz accuracy is ±1% of range full
scale (symmetry off).
value. Display corrected for attenuator setting. 3-digit resolution, accuracy typically 5%
of range. Clipping indicator on display.
setting ±1 digit. Display corrected for attenuator setting. Clipping indicator on display.
OUTPUTS
MAIN - 50 Ohm
Amplitide 2mV to 20V peak-peak open circuit (1mV to
10V peak-peak into 50Ω) in four switchselectable ranges with 20dB vernier control
within each range
Attenuator Ranges: 0dB, -20dB, -40dB, -60dB
DC Offset Range:
MAIN - 600 Ohm Alternative output socket offering the same
AUX OUT 0 to 5V TTL/CMOS logic levels capable of
SWEEP OUT
±10V from 50Ω. DC offset plus signal peak
limited to ±10V (±5V into 50Ω). DC offset
plus waveform attenuated proportionally by
the attenuator.
facilities as the 50Ω socket.
driving 2 standard TTL loads. Frequency,
symmetry and phase as main outputs
3V ramp from 600Ω (TG330 only)
EXTERNAL COUNTER (TG320 and TG330 only)
Frequency Ranges: 5Hz to 25MHz and 20MHz to 120MHz,
Input Sensitivity: 50mV rms (sinewave)
Input Impedance:
Measurement Time: Selectable 0.5s or 5s
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Resolution: 6 digits in 0.5s; 7 digits in 5s
Accuracy: ±1 digit ± timebase accuracy
Timebase Accuracy: ±10ppm initial error; ±5ppm/year ageing rate;
fully autoranging to maximum resolution
1MΩ/25pF
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typically less then 0.5ppm/
C. Adjustment
point for closed-case recalibration
SWEEP MODES
EXTERNAL
Input Impedance:
10kΩ
Input Sensitivity: 0 to 3V for 1000:1 sweep
Max. Input Voltage: ±10V
Sweep Linearity: Better than 1%
Max. Slew Rate: 0.1V/us
INTERNAL (TG330 only)
Sweep Range: 1000:1 within each range.
Sweep Rate: Adjustable, typically 20ms to 20 secs.
Sweep Mode: Linear or logarithmic. Sweep start and stop
frequencies displayed at the press of a but
ton.
Sweep Output:
3V ramp from 600Ω.
AMPLITUDE MODULATION (TG330 only)
Depth: Variable 0 to 100% typical.
Frequency: 400Hz (internal). DC to 20kHz (external).
External Sensitivity: Approximately 2V peak-to-peak for 50% mod-
ulation. Input impedance 40kΩ.
GENERAL
CASING
Moulded ABS case with tilt stand.
POWER REQUIREMENTS
Input Voltage: 220 to 240 volts AC nominal 50/60Hz or
Power Consumption:25VA max.
TEMPERATURE & ENVIRONMENTAL
Operating Temp.
Range: +5
Storage Temp.
Range: -10
Environmental: Indoor use at altitudes up to 2000m.
SIZE 260(W) x 88(H) x 235(D)mm (10.2 x 3.4 x
WEIGHT 1.9kg (4.2lb)
SAFETY Complies with EN61010-1.
EMC Complies with EN61326.
Thurlby Thandar Instruments Ltd. operates a policy of continuous development and
reserves the right to alter specifications without prior notice.
110 to 120 volts AC nominal 50/60Hz by rear
panel adjustment. Installation category II.
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C to +40oC, 20% to 80% RH.
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C to +65oC
Pollution degree 2.
9.2"), excluding handle and feet.
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Designed and built in Europe by:
Thurlby Thandar Instruments Ltd.
Glebe Road, Huntingdon. Cambs. PE29 7DR United Kingdom (UK)
Tel: +44 (0)1480 412451 Fax: +44 (0)1480 450409
Email: sales@tti-test.com Web: www.tti-test.com
82100-0095
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