TTi TG320 - 3MHz Function Generator, LCD, Counter

The TG320 adds an external frequency counter with up to 7 digits of resolution covering 5Hz to 120MHz.

The function generator is one of the most versatile pieces of test & measurement instrumentation 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 constant amplitude as the frequency is varied. Voltage control of frequency enables a source of swept frequency to be generated for frequency response testing. Modulation can also be added.

The TG300 series represents the state-of- the-art in low-cost analogue function generators.

Exceptional Waveform Quality

The TG300 series provides very high waveform quality under all conditions. 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 throughout the frequency range and at low output levels.

Variable Symmetry for Pulse and Ramp Waveforms

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 attenuators of -20dB and -40dB to provide levels down to 2mV pk-pk unterminated. Variable DC offset of ±10V is available via a center detent control. An auxiliary 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.

Dual Digital Displays for Precision and 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 right down to Hz levels. Accuracy is within ±1 digit. To maintain a fast update at sub-Hz frequencies, the measurement mode is changed resulting in 3-digit resolution and reduced accuracy. However, when compared to the normal fixed gate-time meters used in other products it provides both higher accuracy and faster display update across the whole frequency range.

RMS or Peak to Peak Amplitude Display

The output level display can be selected to show any of three values:

1. The peak to peak amplitude
2. The RMS amplitude
3. The DC offset
4. 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 attenuator setting.

A display indicator warns against illegal combinations of offset and amplitude setting that would create clipping in the output stage.

Advanced Internal Sweep

The TG330 incorporates a versatile internal 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 with an oscilloscope or an X-Y recorder. Unlike many other sweep generators, the sweep ramp is triangular which gives a superior display when using an oscilloscope to display swept frequencies.

Advanced Internal Sweep

The TG330 incorporates a versatile internal 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 with an oscilloscope or an X-Y recorder. Unlike many other sweep generators, the sweep ramp is triangular which gives a superior display when using an oscilloscope to display swept frequencies.

Amplitude Modulation for Extra versatility

The TG330 also incorporates comprehensive AM facilities. The modulation can be external or internal (via a 400Hz internal generator) with modulation levels fully variable between 0% and 100%.

External Counter with Seven Digit Resolution

The TG320 and TG330 have an external counter mode which utilises the full width of the display to provide up to seven digits of resolution. The frequency range is from 5Hz up to 120MHz in two ranges, and the input sensitivity is better than 50mV rms. A measurement period of 0.5 or 5 seconds can be selected. A reciprocal counting measurement system is used which ensures high resolution regardless of input frequency. Thus, for example, mains frequency can be measured to a resolution of better than 1mHz. Accuracy is better than 10ppm (0.001%) and an external adjustment point allows for closed case re-calibration.

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.

Part of a Wider Range

TTi offers a wide choice of function generators both analogue and digital, from a simple 2MHz model up to a highly sophisticated 40MHz unit. The following two models share the case style of the TG300 series while offering features sets above and below them.

TG210
The TG210 is a 2MHz generator offering the same high waveform quality and features as the TG315, but without the digital display.

TG550
The TG550 is a 5MHz generator offering a similar feature set to the TG330, but with the added benefit of digital frequency locking.