This is a function generator produced by THURBY THORNDARYN INSTRUMENTS, UK. The model is TG300. It can generate a variety of precision waveforms over a frequency range from mHz to MHz. The output power can be from 2mV to 20V. It can produce sine waves, square waves, sawtooth waves, triangular waves, pulse waves and other waveforms.
The TG300 Series comprises three models (TG315, TG320, TG330) that provide precise function generation from 0.03 Hz up to 3 MHz with a 20 V pk‑pk output. All models feature dual digital displays showing frequency and amplitude simultaneously, variable symmetry, and optional external sweep input.
Advanced features include an internal sweep generator (TG330), external 7‑digit frequency counter (TG320/TG330), amplitude modulation, and a TTL/CMOS auxiliary output. The instruments are housed in a rugged ABS bench case with optional 2U rack mounting.