Function Generators

A function generator, also referred to as a frequency generator, is a test and measurement device that creates electronic signals across a range of waveforms. Connected to a circuit, its main purpose is to produce controllable waveforms with adjustable frequency, amplitude, and DC offset, which helps save time when building oscillators or fabricating prototype audio circuits and low and high-pass filters.

RS NZ stocks function and frequency generators from brands including Keysight and Aim-TTi, spanning benchtop and portable models across a range of frequency ranges, channel counts, and output waveforms.

How Function Generators Work

A function generator works as a controllable signal source, generating a repeating electronic waveform whose characteristics you can adjust to suit the circuit under test. The main parameters are frequency, amplitude, and DC offset, and most generators let you switch between several waveform types, including sine, square, triangle, and sawtooth waves. The output is typically viewed on an oscilloscope, which displays the generated signal so you can confirm its shape and timing. This pairing of a function generator and an oscilloscope is a standard setup on most electronics test benches.

Frequency Range and Waveforms

• 0.001 Hz to 2000 MHz Sine wave
• 0.001 Hz to 160 MHz Square wave
• 0.001 Hz to 800 kHz Triangle wave

Types of Function Generators

Function generators are available in several formats to match different working environments. Benchtop function generators are designed for fixed laboratory and production test benches, offering the highest frequency ranges, stability, and channel counts. A handheld or portable function generator trades some of that performance for battery operation and field portability, making it useful for on-site testing and servicing.

Models also differ by channel count: single-channel generators suit straightforward signal injection, while multi-channel models let you output and synchronise several waveforms at once.

It is also worth distinguishing function generators from arbitrary waveform generators (AWGs). Function generators are usually slightly cheaper than AWGs and perform quite similarly, while AWGs generally provide more functions and offer the ability to create a custom waveform output of any size. A function generator offers a periodic waveform.

Features and Benefits of Function Generators

Beyond basic waveform output, most function generators include features that speed up testing and improve signal control.

• Frequency modulation (FM) and internal or external amplitude modulation let you simulate real-world signals for more representative testing.
• Sweep functions automatically step the output through a frequency range, which makes it faster to characterise how a circuit responds across its bandwidth.
• Digital frequency control gives you precise, repeatable settings you can dial in and return to exactly, supporting consistent results and faster prototyping.

Together, these features turn a simple signal source into a flexible tool for precise circuit development.

How to Choose a Function Generator

Choosing the right function generator is important for accurate, efficient testing. Consider these factors when selecting a model:

• Frequency Range: The frequency range must cover the highest frequency your circuit will be tested at, so check the maximum output frequency before you buy a function generator.
• Number of Channels: Single-channel models suit straightforward signal injection, while multi-channel generators let you output and synchronise more than one waveform at once.
• Waveform Types: Confirm the generator supports the waveforms you rely on, such as sine, square, triangle, sawtooth, or arbitrary shapes for more complex signals.
• Accuracy and Time Base Stability: Where precise, repeatable measurements matter, a stable time base and high accuracy keep your generated signals consistent over time.
• Modulation and Sweep Features: Features such as FM, amplitude modulation, and sweep functions expand what you can test, which is useful for characterising a circuit across its bandwidth.
• Budget: Function generator price scales with bandwidth, channel count, and modulation features, so decide which capabilities you genuinely need to balance performance and cost.

Where are Function Generators Used?

Function generators are used wherever engineers need a reliable, adjustable signal source for testing and development. Their main applications include:

• Integrated electronic testing: Providing known input signals to verify that circuits and components behave as designed.
• Embedded systems: Generating clock and control signals to develop and debug microcontroller-based hardware.
• Digital circuits: Supplying square waves and timing signals for logic and interface testing.
• Analogue signal processing: Feeding sine and other waveforms into filters, amplifiers, and signal chains to check their response.
• Laboratory testing: Acting as a general-purpose signal source across research, education, and calibration work in labs across New Zealand.

Buy Function Generators at RS NZ

RS NZ is a trusted supplier and distributor of function generators and signal generation solutions. We offer a wide range of function and frequency generators sourced from reputable brands like Keysight Technologies, Aim-TTi, and IKALOGIC, ensuring reliable options for every test and measurement task.

Beyond function generators, we also provide a wide array of other signal generators & analysers, such as frequency counters, spectrum analysers, and pulse generators, catering to all your test and measurement requirements.

Explore our user-friendly online site for the full range of products and have them shipped to your door at your convenience. With our flexible delivery options, you can receive your products precisely when needed. For comprehensive details on delivery times and fees, please consult our Delivery page.