Range of three function generators with a maximum frequency of 3MHz and dual displays for simultaneous digital indication of frequency and level
The TG300 series, new from TTi (Thurlby Thandar Instruments), is a range of three function generators with a maximum frequency of 3MHz and dual displays for simultaneous digital indication of frequency and level.
Auto-ranging reciprocal frequency measurement gives four-digit resolution with rapid update down to 2Hz.
Accuracy is within one digit (+/-0.03% at full scale).
To maintain a fast update rate below 2Hz, the measurement mode is changed, resulting in three-digit resolution.
When compared to the normal fixed gate time meters used in other products, the TG300 series provides both higher accuracy and faster display update across the whole frequency range.
The output level display can be selected to show any of three values: peak-to-peak amplitude, RMS amplitude or DC offset.
The decimal point and units are changed automatically, resulting in a display of the true amplitude regardless of the attenuator setting.
The top two models of the series (TG320 and TG330) also have an external frequency counter mode which utilises the full width of the display to provide up to 7.5 digits of resolution.
The frequency range is from 5Hz up to 120MHz, and the input sensitivity is better than 50mV RMS.
Accuracy is typically better than 10ppm and an external adjustment point allows re-calibration when high accuracy is essential.
A measurement period of 0.5 or 5 seconds can be selected.
Reciprocal counting ensures high resolution regardless of input frequency so that, for example, mains frequency can be measured to a resolution of 0.001Hz.
The TG300 series can generate sine, square, triangle, pulse and ramp waveforms from 0.03Hz up to 3MHz.
Variable bi-directional symmetry with constant frequency is provided over a 10:1 range. An external sweep input allows the frequency on each range to be varied by at least 1000:1.
Each generator provides a main output with a maximum EMF of 20V peak-to-peak from a 50-ohm or 600-ohm source.
An amplitude vernier with a range of 20dB is combined with two switched attenuators of -20dB and -40dB to provide levels down to 2mV peak-to-peak unterminated.
Variable DC offset of +/-10V is available via a centre detent control.
An auxiliary output provides a fixed 0V to +5V level suitable for driving both TTL and Cmos loads.
The top model in the series, the TG330, has a built-in sweep generator providing linear or logarithmic sweeps with periods ranging from 20ms to 20sec.
AM capability is also incorporated, with a choice of internal or external modulation from 0 to 100%.
The TG300 series is housed in a robust ABS case with a built-in tilt stand measuring 260 x 88 x 235mm.
The price in the UK ranges between £199 and £269 (plus VAT).
