Signal and Waveform Generator Products from Aim-TTi

  TG120 - Description and Specifications

TG120 - 20MHz Dial-Set Function Generator

  20MHz dial set function generator
0.2Hz to 20MHz frequency range
Sine, square and triangle waveforms plus dc
10mV to 20V pk-pk from 50 Ohms
DC offset control with zero detent
Variable symmetry control
External sweep input
Very low cost.

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20MHz from a low-cost generator
Most lower cost function generators use a technology which enables them to operate up to no more than 2MHz.
The TG120 utilises an alternative technology which retains its waveform quality right up to 20MHz.

Sweep mode operation (external)
The TG120 can be operated in sweep mode by connecting an external sweep voltage. A sweep range of at least 20:1 can be achieved.

Variable symmetry for pulse and ramp waveforms
The TG120 provides switchable bi-directional variable symmetry which enables variable duty cycle pulse waveforms and sawtooths to be generated.
Wide range level control
The TG120 provides a main output with a maximum emf of 20V pk-pk from a 50
W source.

An amplitude vernier with a range of 26dB is combined with two -20dB switched attenuators to provide levels down to 10mV pk-pk. Variable DC offset of ?10V is available via a centre detent control.

Auxilliary Output
An auxilliary output provides a fixed 0 to +5V level suitable for driving both TTL and CMOS loads.


Frequency Range:

0.2Hz to 20MHz in 8 overlapping decade ranges with fine adjustment by a vernier.

Vernier Range:

>10:1 on each range.

Vernier Accuracy:

Typically ?5% of full scale.

Sweep Mode External

Input Impedance:

82 kW

Sweep Range:

Typically > 20:1

Input Sensitivity:

Typically 0 to 2V for 10:1 sweep

Max. Input Voltage:


Max. Slew Rate of sweep voltage:


Operating Modes

(Specifications apply for the top decade of each frequency range and output 10V peak-to-peak into 50W termination).



Typically 2% on 200, 2k and 20k ranges.

Amplitude Flatness:

?0.2dB to 200kHz; ?2dB to 20MHz.



Typically 99% on kHz ranges.


Rise and Fall Times:


DC Range:

?10V from 50W


Symmetry Range:

Typically variable from 1:6 to 6:1 up to 500kHz.


50 Ohms

Three switch-selectable ranges with 26dB vernier control within each range.

0dB Range:

1V to 20V peak-to-peak (0.5V to 10V into 50W).

-20dB Range:

100mV to 2V peak-to-peak (50mV to 1V into 50W)

-40dB Range:

10mV to 0.2V peak-to-peak (5mV to 0.1V into 50W)

DC Offset Range:

?10V from 50 W. DC offset plus signal peak limited to ?10V (?5V into 50W). DC offset plus waveform attenuated proportionally in -20dB and -40dB position.


Capable of driving 4 standard TTL loads.



230V or 115V nominal 50/60Hz, adjustable internally; operating range ?14% of nominal; 30VA max. Installation Category II.

Operating Range:

+5oC to + 40oC, 20% to 80% RH.

Storage Range:

-10oC to +65oC


Indoor use at altitudes to 2000m, Pollution Degree 1.

Electrical Safety:

Complies with EN61010-1.


Complies with EN55011 and EN50082-1.


220(W) x 82(H) x 230(D) mm, (10.3 x 3.4 x 9.2") excluding feet.


1.5 Kg (3.3lb).

 Thurlby Thandar Instruments Ltd. operates a policy of continuous development and reserves the right to alter specifications 
 without prior notice.

Thurlby Thandar Instruments Limited
Glebe Road, Huntingdon, Cambridgeshire PE29 7DR United Kingdom
Tel: +44 1480 412451  Fax: +44 1480 450409  Web:  Email: