Function Generators

A function generator is a test and measurement instrument that produces controllable electronic signals across a range of waveforms, including sine, square, triangular, and sawtooth outputs. As a signal function generator, it allows the user to adjust key parameters such as frequency, amplitude, and DC offset, and most modern units also provide modulation modes including AM, FM, FSK, PWM, sweep, and burst for more advanced signal injection tasks. Engineers and technicians typically pair a function wave generator with an oscilloscope to view the resulting output, characterise circuit behaviour, and confirm that a device under test responds correctly to a known input. As a frequency signal generator, it saves significant time during prototype development by removing the need to build dedicated oscillator circuits for testing audio stages, filters, and other analogue and digital circuitry.

RS Australia stocks a comprehensive range of function generators covering benchtop, portable, analogue, digital, and sweep models.

Types of Function Generators

Function generators are available in several distinct formats, each suited to different precision requirements, working environments, and testing tasks.

• Analogue Function Generators Traditional waveform synthesis using analogue oscillator circuits, offering a lower-cost option well suited to basic educational use and general circuit troubleshooting.
• Digital Function Generators A digital function generator uses DSP-based waveform synthesis to deliver higher precision, improved waveform stability, and wider frequency ranges than analogue models, with most units featuring a colour LCD display alongside USB and LAN connectivity for integration with automated test setups; a digital frequency generator is the preferred choice for repeatable, calibrated measurement work.
• Sweep Function Generators A sweep function generator automatically varies its output frequency between two preset points, making it the standard tool for frequency response testing of filters, amplifiers, and other frequency-selective circuits.
• Portable / Handheld Function Generators A portable function generator is a compact, battery-powered unit designed for field service, on-site diagnostics, and benchwork in space-constrained environments where a full benchtop instrument is impractical.

Frequency Range and Waveforms

The frequency range and waveform options of a function generator define the breadth of testing it can support, with different waveforms suited to different classes of circuit and signal.

• Sine Wave A sine wave signal generator produces the fundamental smooth, periodic waveform used for frequency response testing, audio measurement, and characterising linear circuits, with typical output ranges spanning 0.001 Hz to 2000 MHz across the available product range.
• Square Wave Square waves are used for digital circuit testing, clock signal injection, and characterising switching behaviour, with frequency coverage typically ranging from 0.001 Hz up to 160 MHz on higher-specification units.
• Triangle Wave Triangle waves provide a linear voltage ramp ideal for testing slew-rate-dependent circuits, sweep generation, and certain audio applications, with output ranges generally extending from 0.001 Hz up to 800 kHz.

Key Specifications When Selecting a Function Generator

The right function generator depends on the bandwidth, waveform variety, modulation capability, and connectivity needed to match the application.

• Maximum Frequency / Bandwidth The upper frequency limit determines the range of circuits the instrument can test, from low-frequency audio work through to high-bandwidth RF and digital applications.
• Number of Channels Single-channel units suit basic injection tasks, whilst dual-channel models enable simultaneous generation of two independent signals, useful for differential measurements and phase relationship testing.
• Waveform Types Standard waveforms include sine, square, and triangle outputs, with extended options such as pulse, ramp, noise, and arbitrary waveforms providing greater flexibility for complex testing.
• Modulation Modes Look for AM, FM, PM, FSK, PWM, burst, and sweep modulation modes when testing communication systems, modulated carrier signals, or sweep-based frequency response measurements.
• Vertical Resolution Higher bit depth produces smoother, more accurate waveforms, which is particularly important when reproducing low-distortion sine waves or detailed arbitrary signals.
• Display LED bargraph displays suit basic units, whilst colour LCD touchscreens provide intuitive control of advanced parameters and waveform preview on more sophisticated models.
• Connectivity USB, LAN, and GPIB interfaces enable remote control, automated testing, and integration with PC-based measurement software.
• Portability Benchtop models provide the highest performance and feature sets, whilst handheld units prioritise size, weight, and battery operation for field use.

Applications of Function Generators

Function generators are deployed across virtually every electronics discipline in Australia, supporting design verification, fault diagnosis, education, and quality assurance work.

• Integrated Electronic Testing Used to inject known signals into ICs and PCBs during design verification and production testing, enabling engineers to confirm correct response across a range of input conditions.
• Embedded Systems Development Function generators are used to simulate sensor inputs, clock signals, and PWM sources during embedded firmware and hardware development across Australia's electronics and instrumentation sector.
• Digital Circuit Analysis Provide the clock, data, and trigger signals needed for timing analysis, logic verification, and digital circuit characterisation in development and repair workflows.
• Analogue Signal Processing Used extensively for filter and amplifier testing, frequency response characterisation, and linearity assessment in audio, instrumentation, and RF circuit design.
• Laboratory and Educational Use Australian universities and TAFE electronics laboratories rely on function generators to teach waveform fundamentals, circuit theory, and measurement techniques to engineering students.
• Audio Electronics Used in audio amplifier testing, harmonic distortion measurement, and frequency response work, supporting both professional audio manufacturing and high-end audio repair operations.

Function Generators vs. Arbitrary Waveform Generators (AWGs)

Function generators and arbitrary waveform generators serve overlapping but distinct roles in electronic testing, with the right choice depending on the complexity of the signals required.

Function Generators

• Produce standard periodic waveforms including sine, square, triangle, sawtooth, and ramp outputs.
• Generally easier to operate and lower cost than AWGs, with frequency ranges spanning sub-Hz through to several hundred MHz on higher-end models.
• Ideal for basic circuit testing, education, filter and amplifier characterisation, and general benchwork.

Arbitrary Waveform Generators (AWGs)

• Generate any user-defined waveform point-by-point, allowing reproduction of real-world or custom signals.
• Typically offer higher sample rates, greater vertical resolution, and deeper waveform memory than function generators.
• Ideal for communications testing, aerospace and defence applications, and advanced R&D work where signal fidelity is critical.

When deciding between the two, a function generator is generally the right tool for standard waveforms and routine testing, whilst an AWG is the better choice when simulating real-world signals or replaying captured waveforms is required.

Buy Function Generators Online from RS Australia

RS Australia is a trusted supplier of test and measurement equipment, with an extensive selection of function generators from leading manufacturers including Keysight Technologies, Aim-TTi and IKALOGIC, spanning analogue, digital, sweep, and portable formats across a broad range of frequencies and channel configurations.

Whether you need a sine wave function generator for audio testing, a high-bandwidth digital model for RF and communications work, or a compact portable function generator for field service, the range can be filtered by maximum frequency, number of channels, modulation options, and connectivity to quickly identify the right instrument.

RS Australia also carries complementary products including oscilloscopes, frequency counters, and signal generator accessories, making it easy for engineers and procurement teams to source complete test bench solutions from a single supplier. Browse the full range and order online at RS Australia today. For more information on delivery options and fees, visit our delivery page.