Three models meeting a variety of needs 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 external sweep input. The TG320 adds an external frequency counter with up to seven digits of resolution covering 5Hz to 120MHz. 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 amplitude modulation. Exceptional waveform quality The TG300 series provides very high waveform quality under all conditions. That means low sinewave distortion, low aberation 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. All models have bi-directional variable symmetry at constant frequency from 1:9 to 9:1. Wide range level control The main output has a maximum emf of 20V pk-pk from a 50 Ohm or 600 Ohm source. An amplitude vernier with a range of 40dB is combined with a -20dB switched attenuator to provide levels down to 20mV pk-pk. 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.		Digital display for precision and convenience All 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. Auto-ranging reciprocal measurement gives 4-digit resolution with rapid update right down to Hz levels, below this an alternative technique is used to retain fast display update a sub-hertz frequencies. The output level display can be selected to show any of three values: volts pk-pk, volts rms, or dc offset. 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. Wide sweep range Each range can be swept by at least 1000:1 either manually or via the sweep control input. The TG330 incorporates a versatile internal sweep generator capable of providing linear or logarithmic frequency sweeps. The TG330 provides further versatility by adding AM facilities. The modulation can be external or internal (via a 400Hz internal generator) with modulation levels fully variable between 0% and 100%.

FREQUENCY

Frequency Range: 0.03Hz to 3MHz in 7 overlapping decade ranges with fine adjustment by a vernier.
Vernier Range: 1000:1 on each range.

OPERATING MODES

Specifications apply for the top decade of each frequency range and maximum output into 50 Ohm termination.
SINE
Distortion: <0.5% on 300, 3k and 30k ranges; <1% on 3, 30 and 300k ranges;

all harmonics >25dB below fundamental on 3M range.
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 each range), frequency divided by 10.
METER FUNCTIONS (generator mode)
Frequency: Auto-ranging reciprocal measurement giving 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).
Amplitude: Display shows peak-to-peak amplitude or rms value.
Display corrected for attenuator setting. 3-digit resolution, accuracy typically 5% of range. Clipping indicator on display.
DC Offset: 3-digit resolution; accuracy typically ±2% of setting ±1 digit.
Display corrected for attenuator setting. Clipping indicator on display.
OUTPUTS
MAIN - 50 Ohm
Amplitude: 2mV to 20V peak-peak open circuit (1mV to 10V peak-peak into 50 Ohms) in four switch-selectable ranges with 20dB vernier control within each range
Attenuator Ranges: 0dB, -20dB, -40dB, -60dB
DC Offset Range: ±10V from 50Ohms. DC offset plus signal peak limited to ±10V (±5V into 50Ohms). DC offset plus waveform attenuated proportionally by the attenuator.
MAIN - 600 Ohm 
Alternative output socket offering the same facilities as the 50 Ohms socket.
AUX OUT
0 to 5V TTL/CMOS logic levels capable of driving 2 standard TTL loads. Frequency, symmetry and phase as main outputs
SWEEP OUT
3V ramp from 600W (TG330 only)
EXTERNAL COUNTER (TG320 and TG330 only)
Frequency Ranges: 5Hz to 25MHz and 20MHz to 120MHz, fully autoranging to maximum resolution
Input Sensitivity: 50mV rms (sinewave)
Input Impedance: 1M/25pF
Measurement Time: Selectable 0.5s or 5s
Resolution: 6 digits in 0.5s; 7 digits in 5s (plus overflow to 8 digits)
Accuracy: ±1 digit ± timebase accuracy
Timebase Accuracy: ±10ppm initial error; ±5ppm/year ageing rate;
 typically less then 0.5ppm/oC. Adjustment point for closed-case recalibration
SWEEP MODES
EXTERNAL
Input Impedance: 10k Ohms
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 button.
Sweep Output: 3V ramp from 600Ohms. 
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% modulation. Input impedance 40k Ohms.
GENERAL
CASING
Moulded ABS case with tilt stand.
POWER REQUIREMENTS
Input Voltage: 220 to 240 volts AC nominal 50/60Hz or 110 to 120 volts AC nominal 50/60Hz by rear panel adjustment. Installation category II.
Power Consumption: 25VA max.
TEMPERATURE & ENVIRONMENTAL
Operating Temp.Range: +5oC to +40oC, 20% to 80% RH.
Storage Temp.Range: -10oC to +65oC
Environmental: Indoor use at altitudes up to 2000m. Pollution degree 2.
SIZE
260(W) x 88(H) x 235(D)mm (10.2 x 3.4 x 9.2"), excluding handle and feet.
WEIGHT
1.9kg (4.2lb)
SAFETY
Complies with EN61010-1.
EMC
Complies with EN61326.