The 12 Best Function Generators

Function generators sit at the heart of any serious electronics workbench.

Whether you are debugging an audio amplifier, characterizing a bandpass filter, validating an ADC reference design, or teaching a classroom about AC signals, having a reliable waveform source changes the entire workflow.

A good instrument lets you produce sine, square, triangle, sawtooth, and arbitrary waveforms across a wide frequency range with precise amplitude and DC offset control, so you are always working with known, repeatable signals rather than guessing.

The gap in real-world usefulness between a budget DDS module and a properly engineered bench instrument is enormous, and that gap is not always obvious from a spec sheet alone.

ProductFind assembled this guide through comprehensive research: we cross-referenced published specifications, synthesized expert review consensus from the electronics community, analyzed verified buyer feedback across hundreds of purchases, and examined manufacturer data to assess how each model performs where it matters most.

Options in this roundup come from Rigol, Siglent, UNI-T, OWON, Abestop, and Koolertron, spanning entry-level hobbyist kits to capable dual-channel arbitrary waveform generators suited for professional environments.

Our picks below are ranked by PF Score to help you find the right instrument for your needs and budget.

Function Generators Buying Guide

Choosing the right function generator means understanding which specifications translate to real-world capability and which are marketing numbers that rarely matter in practice.

The sections below walk through the criteria that genuinely affect how useful an instrument will be on your bench, day after day.

If you are also building out your measurement toolkit, pairing a function generator with a quality oscilloscope is one of the most productive investments you can make.

Frequency Range and Bandwidth

The maximum frequency a generator can produce cleanly is the single most important specification for most buyers. For hobbyist audio work, filter characterization, and basic circuit debugging, a 25 MHz or 30 MHz instrument covers the overwhelming majority of real-world tasks.

RF work, high-speed digital signal simulation, and advanced mixed-signal applications push requirements toward 60 MHz, 70 MHz, or beyond.

Pay attention to whether the stated bandwidth applies to sine waves specifically.

Many generators advertise their maximum frequency for square or arbitrary waveforms, where rise time limitations mean the signal looks nothing like a clean square at the top of the range.

A well-engineered 40 MHz instrument that maintains signal integrity all the way to its rated frequency is more useful than a nominally wider unit with degraded fidelity in its upper octaves.

For most engineers and serious hobbyists, 25 MHz to 40 MHz is the practical sweet spot. If you routinely work with RF stages, switching power supply control loops, or high-speed serial signals, budgeting for a 60 MHz or 70 MHz model is worthwhile.

Koolertron’s 60 MHz and 15 MHz DDS options serve entry-level users, while Rigol and Siglent dominate the mid-range with substantially better signal fidelity at their rated bandwidths.

Channel Count and Independence

Single-channel generators force you to use external splitters or multiple instruments the moment you need to evaluation differential pairs, stimulus-and-response setups, or I/Q signal generation.

Dual-channel instruments remove this constraint and open up a wide range of more advanced measurements. The key question is whether the two channels are truly independent or share a common timebase with limited phase flexibility.

Truly independent dual channels let you set different frequencies, amplitudes, waveforms, and DC offsets on each output simultaneously.

This is essential for evaluation balanced audio circuits, comparing the response of two filter paths, or generating complementary drive signals for H-bridge circuits.

Phase coupling between channels, where you can lock the phase relationship between two signals at the same frequency, adds further flexibility for evaluation phase-sensitive designs.

Every instrument on our list offers dual-channel output. However, the quality of channel isolation and independence varies considerably.

Rigol’s and Siglent’s implementations, supported by their SiFi and TrueArb architectures respectively, are widely regarded by expert reviewers as among the most capable in their price tiers.

Budget models from Koolertron and the FG-200 module handle basic dual-channel operation but show more crosstalk at higher frequencies.

Vertical Resolution and DAC Quality

Vertical resolution, specified in bits, determines the fineness of amplitude steps in the digital-to-analog conversion process.

An 8-bit DAC produces 256 discrete amplitude levels; a 14-bit DAC produces 16,384. This difference is audible in audio applications and measurable in sensitive analog circuits. Low vertical resolution introduces quantization noise that can mask the behavior you are trying to study.

For serious bench work, 14 bits is now a practical baseline. Most of the better instruments in this roundup, including models from Rigol, Siglent, UNI-T, OWON, and Abestop, offer 14-bit resolution.

The Siglent SDG2042X goes further with 16-bit resolution through its TrueArb mode, which is meaningful for fine-grained arbitrary waveform playback and precise level setting.

Budget DDS modules like the FG-200 use simpler DAC implementations that are adequate for square and triangle wave applications but limit sine wave quality.

When evaluating vertical resolution claims, look for the distinction between the hardware DAC bit depth and the effective number of bits (ENOB) in practice.

Manufacturer-published ENOB figures and third-party measurements from the engineering review community often reveal meaningful differences that raw bit-depth claims do not capture. This is one area where expert review consensus across electronics forums and professional publications carries significant weight.

Arbitrary Waveform Capability and Memory Depth

An arbitrary waveform generator (AWG) allows you to define custom waveform shapes, upload them from software, and play them back through the DAC.

This capability is indispensable for simulating sensor outputs, replicating real-world captured signals, generating non-standard modulation patterns, or evaluation specific edge cases in a design.

The depth of the waveform memory determines how complex and how long those custom patterns can be.

Rigol’s DG1022Z ships with up to 16 million points of waveform memory per channel, which is genuinely deep for a generator in its price range and allows for detailed, long-duration arbitrary patterns without aliasing or truncation artifacts.

Siglent’s SDG2042X uses TrueArb architecture to reconstruct arbitrary waveforms point-by-point rather than through simple interpolation, which preserves waveform shape more faithfully at the output.

The Abestop DGE2070 and OWON units include large libraries of built-in arbitrary waveforms as a starting point.

PC connectivity matters here. Instruments that include robust software for waveform creation and upload, along with reliable USB and LAN interfaces, make arbitrary waveform work far less painful.

Rigol’s Ultra Sigma software and Siglent’s EasyWave are both well-regarded by the engineering community. Evaluate whether the vendor maintains software compatibility with current operating systems, as older utilities from budget brands sometimes create friction on modern machines.

Connectivity and Remote Control

Modern bench instruments increasingly need to talk to computers and automated evaluation systems. USB device ports for PC control are now standard on virtually every generator above hobbyist entry level.

LAN (Ethernet) connectivity is where mid-range instruments start to differentiate: it allows integration into automated evaluation environments, remote operation across a network, and SCPI (Standard Commands for Programmable Instruments) control from scripts or LabVIEW.

This matters enormously if the generator will be part of a semi-automated evaluation station or used in a research environment.

The Rigol DG1022Z includes both USB and LAN interfaces along with full SCPI support, which is notable at its price point and a meaningful advantage for anyone who automates measurements.

The Siglent SDG2042X adds USB host functionality, allowing direct waveform data storage to a USB drive without needing a laptop.

OWON’s DGE1060 and Abestop’s DGE2070 also include SCPI and PC control, while Koolertron’s DDS generators are standalone instruments with no remote control capability.

Pairing a function generator with capable digital multimeters and oscilloscopes over a shared bench setup becomes far more efficient when each instrument supports programmatic control.

Display, Interface, and Frequency Counter

A clear, readable display reduces the chance of setup errors and speeds up parameter entry.

Color TFT displays that show waveform preview, frequency, amplitude, offset, and modulation settings simultaneously are now common on mid-range instruments and represent a genuine usability improvement over single-line character displays.

Touchscreen interfaces, as found on the Siglent SDG2042X, further streamline parameter entry. Koolertron’s numeric keypad-and-knob approach is functional but slower for complex setups.

Many generators in this category include a built-in frequency counter, which allows the instrument to measure an external signal’s frequency without needing a separate counter.

This is particularly handy when validating oscillator circuits or checking the output of a circuit under evaluation in relation to your stimulus. The Rigol DG1022Z, Siglent models, UNI-T UTG932E, and Koolertron units all include frequency counter functionality.

Budget-tier DDS modules like the FG-200 include basic counter capability but at limited accuracy.

Button layout and menu depth affect how quickly you can reconfigure the instrument mid-measurement. Instruments with dedicated front-panel buttons for waveform type, modulation, and channel switching are meaningfully faster in practice than those that bury these options in nested menus.

Buyer feedback across verified purchases consistently highlights interface responsiveness as a deciding factor in daily satisfaction, particularly for users who frequently switch between different waveform types and parameter sets.

Why You Should Trust Us

ProductFind is an independent review publication. We do not sell the products we recommend, and we have no affiliation with any manufacturer or retailer listed in this guide.

Every instrument in this roundup is evaluated using the same consistent framework and scored on our 0 to 10 PF Score scale.

Our evaluation methodology is built on comprehensive research synthesis: we analyze manufacturer-published specifications, cross-reference engineering community and expert reviewer consensus, examine verified buyer feedback from confirmed purchasers, and incorporate published measurement data from credible sources.

We do not conduct our own product trials; our evaluations are grounded in research, published data, expert review consensus, and verified buyer feedback.

This approach lets us cover a broader range of instruments with depth and consistency that single-reviewer hands-on guides cannot scale to match.

ProductFind may earn a commission when you purchase through links in this article. That affiliate relationship has zero influence on PF Scores, product rankings, or which instruments we choose to include or exclude.

Our editorial decisions are made independently of commercial considerations, and we disclose this relationship so you can weigh our recommendations accordingly.

Final Thoughts

The function generator market in 2026 covers an unusually wide range of capability and price.

A simple DDS module can handle basic waveform generation for casual hobby projects, while a properly engineered dual-channel arbitrary waveform generator with deep memory, 14-bit or higher resolution, and full connectivity opens the door to professional-grade measurement work.

The instruments in this roundup span that spectrum, and the right choice depends on what you are actually building and measuring. Below are our editorial picks by category, each linked to the full product card above.

• Best Overall: Rigol DG1022Z 25MHz Dual Channel Function Arbitrary Waveform Generator earns the top PF Score in this roundup through its combination of dual independent channels, deep 16-million-point waveform memory, SiFi signal fidelity technology, LAN and USB connectivity, and strong expert and buyer consensus at a mid-range price point.
• Best for High-Bandwidth Work: Siglent Technologies SDG2042X delivers 40 MHz bandwidth with 16-bit TrueArb resolution, a touchscreen interface, and LAN connectivity, making it the go-to pick for users who need cleaner arbitrary waveform reconstruction and a more refined front-panel experience.
• Best Mid-Range Value: Rigol DG1032Z 30MHz offers 14-bit resolution, 8-million-point arbitrary waveform depth, and dual-channel output at a lower price than the DG1022Z while retaining the core Rigol firmware quality that the engineering community consistently praises.
• Best for Budget-Conscious Professionals: Abestop DGE2070 70MHz Dual-Channel punches well above its price with 70 MHz bandwidth, 14-bit resolution, SCPI and PC control, and a library of 150 built-in arbitrary waveforms, making it an outstanding choice for users who need higher bandwidth without paying flagship prices.
• Best Entry-Level Bench Instrument: UNI-T UTG932E 30MHz provides a genuine bench-grade experience with dual channels, 14-bit resolution, a built-in frequency meter, and a clear display at a price that makes it accessible to students and hobbyists stepping up from basic DDS modules.

Whichever generator you choose, make sure your bench setup supports it properly. A function generator is most productive when paired with a capable oscilloscope so you can verify the output waveform and observe the circuit’s response simultaneously.

Building out a complete measurement station piece by piece is a practical approach that keeps costs manageable while steadily increasing what you can characterize and debug.

Frequently Asked Questions

What is the difference between a function generator and an arbitrary waveform generator?

A function generator produces standard, predefined waveform shapes: typically sine, square, triangle, sawtooth, and pulse.

An arbitrary waveform generator (AWG) adds the ability to define any custom waveform shape, upload it from PC software, and play it back through a high-resolution DAC.

Most modern bench instruments combine both capabilities, letting you use standard waveforms for routine tasks and switch to arbitrary mode when you need to simulate a specific signal.

All of the mid-range and higher instruments in this roundup function as AWGs in addition to standard function generators.

How much bandwidth do I actually need for general electronics work?

For the vast majority of hobbyist and general-purpose engineering tasks, including audio circuit design, analog filter characterization, power supply evaluation, and microcontroller debugging, a 25 MHz to 30 MHz generator covers everything you will encounter.

Most real-world signals in those applications fall well below 10 MHz, and the additional headroom ensures clean waveforms without running the instrument at its frequency ceiling.

Step up to 60 MHz or 70 MHz only if you regularly work with RF stages, high-speed serial interfaces, or switching converter control loops that operate in the tens of megahertz range.

Is a dual-channel generator worth the extra cost over a single-channel unit?

In almost every case, yes.

Dual-channel instruments allow you to generate a stimulus signal on one channel and a reference or response signal on the other, which is useful for evaluation differential circuits, comparing two signal paths, or generating complementary drive waveforms.

The practical cost difference between single and dual-channel instruments at comparable specs has narrowed considerably in recent years. Every generator in this roundup offers dual-channel output, which reflects how standard the feature has become at current price points.

Do I need SCPI or PC control for home lab use?

Not for routine bench work, but SCPI and PC control become genuinely valuable the moment you want to automate a sweep, log multiple measurements, or integrate the generator into a script-driven characterization routine.

If you are taking the same measurements repeatedly across component variations or temperature ranges, automated control saves significant time. Rigol’s DG1022Z and DG1032Z, OWON’s DGE1060, and the Abestop DGE2070 all include SCPI support.

For fully manual bench work, a clean front-panel interface matters more than remote control capability.

What waveform resolution should I look for, and does the bit depth actually matter?

Bit depth matters most for arbitrary waveform accuracy and for applications involving precise amplitude control.

A 14-bit DAC produces far smoother sine waveforms than an 8-bit equivalent, and that smoothness translates into lower harmonic distortion in audio and analog signal integrity work.

For standard square wave generation or basic signal injection, lower bit depth is workable. For filter design, ADC/DAC linearity checks, or any application where waveform purity directly affects the measurement, 14 bits should be your minimum.

The Siglent SDG2042X’s 16-bit TrueArb mode is meaningful for users who need maximum waveform precision.

Can a budget DDS module replace a proper bench function generator?

For very simple tasks such as generating a rough square wave to clock a circuit or producing a low-frequency triangle wave for a basic sweep, a budget DDS module can technically get the job done.

However, the tradeoffs are significant: limited frequency accuracy, poor waveform fidelity at higher frequencies, no arbitrary waveform capability, no calibrated amplitude control, and no remote interfacing.

Verified buyer feedback on lower-cost DDS products consistently notes frustration when users try to use them for anything beyond the most basic applications.

If you are serious about electronics work, even a modestly priced bench instrument from Rigol, UNI-T, or OWON will save you far more time and frustration than the price difference suggests.

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