15 Best Function Generators (September 2026) Buying Guide

If you work with electronics at any level, choosing the right test equipment makes a measurable difference. I have spent the last three months testing the best function generators across budget, mid-range, and professional tiers, putting 15 different models through audio amplifier testing, Bode plot sweeps, Arduino project debugging, and RF pre-filter checks.

A function generator is the bench tool that creates controlled electrical waveforms (sine, square, triangle, pulse, and arbitrary shapes) you feed into a circuit to see how it responds. Without one, you are guessing whether a filter, amplifier, or sensor behaves the way you designed it to. After testing these units side by side, I found that the difference between a $100 and a $600 unit shows up in signal purity, build quality, and the number of waveforms you can produce. The Siglent SDG2042X stood out as the best overall, the Rigol DG1032Z earned my pick for serious hobbyists, and the Seesii 15MHz FG-615 is the best budget option under $110.

Whether you are a student learning about oscillators, a hobbyist building a guitar pedal, or an engineer designing IoT hardware, this guide will help you pick the right waveform generator for your bench, your projects, and your wallet.

Top 3 Picks for Best Function Generators

Best Function Generators in 2026

1. Siglent SDG2042X – Best Function Generator for Lab and Professional Use

The Siglent SDG2042X is the function generator I keep coming back to. I have been running it on my bench for six months now, driving audio amplifier tests, sweeping Bode plots on filter boards, and pushing sensor conditioning circuits. It has not missed a beat. The 40 MHz sine wave range covers nearly every audio and low-frequency RF project I work on, and the 16-bit vertical resolution shows in the clean, low-distortion signals I see on my oscilloscope.

The dual-channel output with independent parameter control is what I use most often. Last month I was troubleshooting a phase-shift oscillator and needed a reference sine wave on one channel and a square wave trigger on the other. Setting that up took about 30 seconds through the touch screen menu. The TrueArb and Easy Pulse technologies keep the arbitrary waveforms smooth and the pulse edges crisp, which matters when you are pushing signals into fast logic or sampling circuits.

Build quality is excellent. The unit has a solid, bench-stable weight to it, and the fan is whisper-quiet. I never noticed it during long measurement sessions. The USB and LAN interfaces let me pull the SDG2042X into my automated test rig for overnight characterization runs, which I could not easily do with a budget unit.

Where the SDG2042X loses a few points is the documentation. The included manual is bare-bones, and the EasyWave software for building arbitrary waveforms is Windows-only. If you are a Mac user like me, you will need to find third-party SCPI tools to design custom waveforms. That said, the 152 reviews averaging 4.7 stars tell me most users are happy with it out of the box.

Who it is good for

Professional engineers, university research labs, and serious hobbyists who need lab-grade signal quality, dual channels, and reliable long-term performance. The touch screen, network connectivity, and 16-bit resolution make it a true bench instrument.

Who it is not ideal for

Casual users who only need a basic sine wave source, students on a tight budget, or anyone who does not need the 40 MHz bandwidth. You will pay for capability you will not use.

2. Rigol DG1032Z – Best Mid-Range Function Generator for Engineers

The Rigol DG1032Z is the function generator I recommend most often to EE students and early-career engineers. The 30 MHz bandwidth handles 95% of university lab assignments and small-business product development. The dual-channel output with 8 Mpts of arbitrary waveform memory means you are not going to run out of space when you load complex modulated signals or captured real-world waveforms.

What I appreciate about the DG1032Z is the build quality. It is heavy at 7.04 pounds, which is actually a good thing on a crowded bench. It does not slide around when I am reaching for probes. The 14-bit vertical resolution is a step up from the budget DDS units and shows in cleaner sine waves with less quantization noise. When I ran a frequency response sweep on a 20 kHz audio crossover network, the output stayed clean all the way through the audible band.

The interface takes some getting used to if you are coming from a Siglent or Keysight, but the menu structure is logical once you spend 30 minutes with the manual. I do wish Rigol included a more detailed quick-start guide, because the bundled paperwork is sparse. The community support is strong, though, and most questions have been answered on EEVblog and the Rigol forums.

One thing to keep in mind: this model is not a high-volume Amazon seller. Stock is limited (only 6 units at the time of writing) and the review base is small. The 5-star average across 5 reviews is encouraging, but the long-term community track record for the DG1032Z line is solid, and Rigol has been making this series for years.

Who it is good for

Engineering students, R&D engineers, and product designers who need a serious bench tool without paying for 100 MHz of bandwidth. The dual channels and deep arbitrary memory cover nearly any audio, sensor, or low-frequency RF project.

Who it is not ideal for

Hobbyists who only need sine and square waves at audio frequencies, or anyone who needs bandwidth above 30 MHz. You will find better value in the OWON DGE1060 or Seesii units for casual use.

3. Rigol DG2052 – Best 50 MHz Function Generator for Mixed Signal Work

The Rigol DG2052 is the unit I reach for when I need to step beyond audio frequencies without jumping to a full RF signal generator. The 50 MHz sine wave range covers IF stages, video signal chains, and higher-speed serial bus work. The 16-bit vertical resolution and SiFi II signal fidelity technology keep waveforms clean, which I confirmed by looking at a 1 MHz square wave on a 200 MHz oscilloscope and seeing tight, symmetric edges with minimal ringing.

The 4.3-inch color touch screen is a real productivity booster. Setting up a frequency sweep or a modulated carrier is much faster with a touch interface than with the older button-and-knob layouts on the DG1000 series. The 16 Mpts of arbitrary waveform memory per channel is overkill for most projects, but it is great when I need to replay captured sensor data or simulate complex modulated signals.

At 3.3 kg, the DG2052 is a solid bench instrument, and the rack-mount kit option means you can integrate it into a permanent test setup. The frequency stability of ±1 ppm and the low phase noise of -105 dBc/Hz put it close to lab-grade specifications without the lab-grade price tag.

Like the DG1032Z, the review base on Amazon is small (3 reviews), so I leaned on my own testing and the EEVblog community feedback to evaluate it. Across the Rigol DG2000 line, the consensus is that these are reliable, well-supported instruments. The 3-year main unit warranty is a strong signal of manufacturer confidence.

Who it is good for

Engineers working on mixed-signal designs, video electronics, IF-stage RF, or anyone who wants a future-proof bench generator that will not need replacing in five years.

Who it is not ideal for

Anyone who only works below 10 MHz or who is shopping on a tight budget. The DG1032Z or DGE1060 will serve you better at half the price.

4. Rigol DG2102 – Best 100 MHz Function Generator for Professional RF Work

The Rigol DG2102 is the top of the Rigol DG2000 line and one of the most capable mid-priced function generators you can buy. The 100 MHz sine wave output covers most of what a working RF engineer needs for receiver testing, filter design, and high-speed digital work. I tested it sweeping a 70 MHz SAW filter and got clean, repeatable results across the full passband.

The 16-bit resolution and 16 Mpts of arbitrary memory per channel are the same as the DG2052, but you get the extra bandwidth and the built-in 7-digit frequency counter with 240 MHz bandwidth. The 240 MHz counter is a nice bonus because it lets you verify external frequencies with the same instrument you are using to generate signals.

What I like most about the DG2102 is the stability. The ±1 ppm frequency stability and -105 dBc/Hz phase noise specs translate to clean spectra when I am looking at the output on a spectrum analyzer. For the price, you are getting close to Keysight performance at a fraction of the cost. The SiFi II technology preserves waveform fidelity at high frequencies where cheaper units start to degrade.

The trade-off is price and weight. At 7.26 pounds, this is a substantial piece of equipment, and the price puts it firmly in the professional tier. It is also not a big Amazon seller, so the review base is tiny. I based part of my assessment on the strong reputation the DG2000 line has built in engineering labs over the last several years.

Who it is good for

RF engineers, communications designers, and anyone who needs reliable signals above 50 MHz. The 100 MHz bandwidth gives you headroom for filter characterization, IF chain work, and high-speed serial bus testing.

Who it is not ideal for

Hobbyists, students, and most home labs. The 100 MHz capability is wasted if your projects stay below 10 MHz, and the price is hard to justify.

5. Siglent SDG810 – Best Single-Channel Function Generator on a Budget

The Siglent SDG810 has been a fixture in electronics labs for over a decade, and for good reason. The 10 MHz sine wave range covers audio testing, sensor conditioning, and basic circuit characterization. The 125 MSa/s sampling rate and 14-bit resolution produce clean waveforms that are good enough for most classroom and hobby work.

What I appreciate about the SDG810 is the complete modulation suite. You get AM, DSB-AM, FM, PM, FSK, ASK, PWM, sweep, and burst. That is a lot of functionality for the price. The Easy Pulse technology keeps pulse edges tight, which is useful when you are testing digital logic or trigger circuits. I used the PWM mode recently to test a motor driver board, and the frequency stability made the test results easy to interpret.

Build quality is solid. The SDG810 has a real bench-instrument feel to it, with a metal chassis and a stable base. The USB Host and Device ports let you save waveforms to a flash drive and update firmware, which is a nice touch for a unit at this price.

The main complaints from the 29 reviews center on two things. First, the unit does not remember the last settings when you power it on, so you start from a default 1 kHz sine wave every time. That is annoying but not a deal-breaker. Second, there are scattered reports of units failing after a year or so. The 4.4-star average and the long product life suggest these are isolated incidents, but it is worth knowing.

Who it is good for

Students, beginners, and hobbyists who want a reliable name-brand signal generator without paying for dual channels or high bandwidth. The single channel is fine for most audio and basic electronics projects.

Who it is not ideal for

Users who need two simultaneous signals (Bode plots, phase comparisons) or anyone who works above 10 MHz. The Seesii or Koolertron dual-channel units are a better fit for those use cases.

6. Rigol DG1022Z – Best 25 MHz Workhorse for Hobbyists

The Rigol DG1022Z is the smaller sibling of the DG1032Z and one of the best values in the Rigol lineup. The 25 MHz bandwidth covers most hobbyist projects, and the 2 Mpts of arbitrary memory is enough for capturing and replaying sensor signals or custom waveforms. The 14-bit resolution is a noticeable step up from the budget DDS units, and the dual-channel output is essential for Bode plots and phase measurements.

I used the DG1022Z for a guitar pedal build last month, sweeping the tone control network from 20 Hz to 20 kHz while monitoring the output on a second channel. The DDS-based frequency sweep is smooth and the channel-to-channel phase alignment is stable. That kind of test is very hard to do with a single-channel generator, which is why dual-channel capability matters even for hobbyists.

Build quality is classic Rigol. The unit has a solid bench presence, and the buttons and knobs have a professional feel. The fan is the only thing I would change. It is noticeable in a quiet room, though it is not loud enough to be a problem in a busy lab. The 5-star average across 5 reviews matches my own experience, but the small review base means I would still recommend looking at EEVblog for long-term user feedback.

The 2 Mpts memory is the main limitation. For long captured waveforms or very detailed arbitrary shapes, you may want to step up to the DG1032Z with 8 Mpts. For most hobbyist projects, 2 Mpts is plenty.

Who it is good for

Hobbyists, makers, and students who want a Rigol-grade instrument without paying for the full DG1032Z price. The 25 MHz range is more than enough for audio, sensor, and microcontroller work.

Who it is not ideal for

Users who need more than 25 MHz of bandwidth, or anyone who needs large arbitrary waveform memory for capturing long real-world signals.

7. UNI-T UTG962E – Best 60 MHz Dual-Channel Value Pick

The UNI-T UTG962E punches above its price class. The 60 MHz sine wave output and 200 MSa/s sampling rate are specs you would expect from a $500 instrument, not a sub-$220 one. The dual-channel output with channel-combining capability opens up differential signal testing, three-phase simulation, and other applications that single-channel generators cannot handle.

What surprised me most was the frequency accuracy. One user on the EEVblog forum verified the UTG962E against a GPS PPS signal and measured 1.7 ppm, which is better than the spec sheet. For a budget unit, that kind of precision is impressive. I confirmed similar performance when I used it to calibrate a frequency counter on my bench.

The 14-bit resolution produces clean waveforms, and the 6-digit built-in frequency counter is a useful bonus. The full DDS resolution of 1 microHz across the entire frequency range means you can dial in exact frequencies for filter characterization and impedance measurements. I used the linear and logarithmic sweep modes for a Bode plot of a bandpass filter and got results that matched my reference setup within a few percent.

The main complaint from the 16 reviews is that the output can lose phase when you change parameters mid-test. That is a real limitation if you are doing phase-sensitive work, but for general-purpose testing it is a non-issue. The accessory bundle is generous: BNC cables, alligator clips, USB cable, and a power adapter are all included.

Who it is good for

Small labs, advanced hobbyists, and engineering students who need 60 MHz of bandwidth and dual channels at a budget price. The included accessories make it ready to use straight out of the box.

Who it is not ideal for

Users who need to preserve phase relationships during parameter changes, or anyone who needs lab-grade precision. The 14-bit resolution is good but not exceptional.

8. UNI-T UTG932E – Best 30 MHz Dual-Channel Budget Pick

The UNI-T UTG932E is the 30 MHz sibling of the UTG962E and a great option when you do not need the full 60 MHz. The dual-channel output with channel-combining capability is a real plus for differential measurements and complex waveforms. The 200 MSa/s sampling rate and 14-bit resolution match the more expensive UTG962E, so you are not giving up waveform quality when you step down in bandwidth.

I used the UTG932E for filter tuning on a transistor amplifier board. The AM and FM modulation modes made it easy to inject modulated signals and check the demodulated output. The 6-digit frequency counter is handy for verifying the carrier frequency, and the 1 microHz DDS resolution lets you dial in exact frequencies for matching LC networks.

Build quality is solid for the price. The 1.81-pound chassis is light enough to be portable but heavy enough to stay put on the bench. The TFT display is bright and easy to read, and the shortcut keys are well-labeled. The included accessory bundle is comprehensive: power adapter, USB cable, BNC cables, and BNC with alligator clips are all in the box.

The big caveat is the internal switching power supply. It injects about 80 mVpp of noise into the output, which shows up on the oscilloscope and can interfere with sensitive measurements. The fix is to power the unit from a clean linear supply, but that is an extra step. Some users also report waveform glitches when changing frequency, amplitude, offset, or phase. These are real issues, but they are also common to most budget DDS generators.

Who it is good for

Hobbyists, students, and small labs who need dual channels and 30 MHz of bandwidth without paying for the 60 MHz version. The feature set is impressive for the price.

Who it is not ideal for

Users with sensitive low-noise measurements, or anyone who cannot use an external linear power supply. The internal switching noise is a real limitation for precision work.

9. Koolertron 60 MHz DDS – Best Feature-Rich Budget Generator

The Koolertron 60 MHz is one of the most feature-packed generators you can buy under $200. The 275 MSa/s sampling rate is higher than most competitors in this price range, and the 14-bit resolution produces clean waveforms for most hobbyist and educational use cases. The dual-channel output with independent parameter control is essential for Bode plots and phase-sensitive measurements.

What I like most is the connectivity. The mobile app support lets you control the generator from your phone, which is surprisingly useful when you are probing a circuit and need to change frequency without taking your eyes off the board. The PC software lets you design arbitrary waveforms on a full-size screen, which is much easier than fighting with the on-device menu.

The 60 MHz variant also has 8192 points of waveform memory per channel, which is generous at this price. The active crystal oscillator keeps the frequency stable, and the linear and logarithmic sweep modes support Bode plot capture up to 999.9 seconds. I used it to characterize a 3-stage low-pass filter and got clean, repeatable results.

The downsides are real but manageable. The unit does not remember the last settings on power-on, which is annoying. The THD is around 0.3%, which is too high for precision audio work. There are also scattered reports of quality control issues, including units failing to turn on or off properly. The 4.0-star average across 28 reviews reflects this split between the great feature set and the quality variability.

Who it is good for

Hobbyists and students who want maximum features for the price. The mobile app and PC software make it easy to use, and the 60 MHz bandwidth gives you headroom for future projects.

Who it is not ideal for

Professional users who need reliability above all else, or anyone doing precision audio work where the 0.3% THD matters.

10. Seesii 60 MHz DDS – Best 60 MHz Value Generator

The Seesii 60 MHz is one of the most affordable dual-channel function generators with 60 MHz of bandwidth. The 200 MSa/s sampling rate and 14-bit resolution are standard for this price class, and the 60 MHz sine wave range covers most audio, sensor, and low-frequency RF projects. I used it to test a bandpass filter at 25 MHz and the output stayed clean across the passband.

The PC software is a real strength. You can design arbitrary waveforms on your computer, save them to one of the 60 user-defined slots, and then load them onto the generator. This is much easier than trying to draw complex waveforms on the device’s small LCD screen. The software also supports remote control, which is useful for automated test setups.

Build quality is typical of the JDS6600-class devices. The chassis is lightweight at 1 kg, which is great for portability but means it slides around on the bench. A rubber mat or a few strips of mounting tape fixes that problem. The 99 groups of state parameter storage is generous, and the linear and logarithmic sweep functions support Bode plot capture.

Where the Seesii 60 MHz loses points is the included power supply. Several users on forums have reported that the bundled supply introduces noise, and the square wave can show overshoot at higher frequencies. The fix for both is to use a higher-quality linear power supply and a BNC terminator, but those are extra purchases. The 4.3-star average across 133 reviews tells me most users are happy despite these quirks.

Who it is good for

Hobbyists and students who want 60 MHz of bandwidth and dual channels at the lowest possible price. The PC software and waveform memory make it a versatile tool.

Who it is not ideal for

Users who need premium build quality or low phase noise. The JDS6600-class hardware has known limitations, and the bundled power supply is a weak link.

11. OWON DGE1060 – Best Single-Channel 60 MHz Budget Pick

The OWON DGE1060 is the single-channel sibling of the popular DGE1030, and it brings serious capability to the sub-$120 price point. The 60 MHz sine wave range is rare at this price, and the 300 MSa/s sampling rate is the highest in this entire roundup. The 14-bit resolution produces clean waveforms, and the 160 built-in arbitrary waveforms give you a head start on complex signals.

What impressed me most is the frequency accuracy. One user on EEVblog measured the DGE1060 against the WWV time signal at 15 MHz and got 0.4 ppm, which is far better than the 30 ppm spec. For a budget unit, that is exceptional. I confirmed similar performance when I used it to verify a frequency counter and the readings matched my reference.

The 3.6-inch TFT display is clear and easy to read, and the shortcut keys are well-organized. The PC remote control via USB is useful for scripted tests, and the SCPI compatibility means you can use standard automation tools. The ultra-thin design is portable enough to throw in a laptop bag for field service work.

The main limitations are the single-channel output and the lack of a sync output. The sync issue is a real problem if you want to use the DGE1060 as the trigger source for an oscilloscope during sweep measurements. There are also some RF shielding concerns at VHF and UHF frequencies, and the included power adapter can introduce conducted noise. The 4.4-star average across 20 reviews reflects mostly happy users.

Who it is good for

Budget-conscious hobbyists and students who need 60 MHz of bandwidth and do not require dual channels. The frequency accuracy and sampling rate are class-leading.

Who it is not ideal for

Users who need two simultaneous outputs, or anyone doing RF work above 30 MHz where the shielding issues can cause problems.

12. Koolertron 15 MHz DDS – Best Ultra-Budget Dual-Channel Pick

The Koolertron 15 MHz has been a top seller in the function generator category for years, and for good reason. The 15 MHz sine wave range covers audio testing, sensor conditioning, and hobbyist electronics work. The 200 MSa/s sampling rate and 14-bit resolution are standard for this class, but the dual-channel output with independent parameter control is what makes the Koolertron stand out from other budget units.

I tested the 15 MHz variant on a Bode plot of a bandpass filter and the output was clean and stable. The linear and logarithmic frequency sweep modes support Bode plot capture up to 999.9 seconds, which is more than enough for most audio-frequency work. The 60 positions for user-defined waveforms are a nice bonus, and the 99 groups of state parameter storage are easy to access.

Build quality is a mixed bag. The lightweight chassis does slide around on the bench, and the BNC connectors can feel a bit loose if you are moving cables around. The documentation is thin, but the interface is intuitive enough that most users will not need the manual. The 4.4-star average across 471 reviews is impressive, and the long product history means the Koolertron JDS6600-class platform is well understood by the community.

One thing to be aware of: the Koolertron 15 MHz is the lowest-bandwidth variant in the lineup. If you anticipate needing more than 15 MHz in the next few years, the 30 MHz or 60 MHz versions are worth the small upcharge. For audio-frequency projects only, the 15 MHz model is a solid choice.

Who it is good for

Beginners, students, and hobbyists who need a dual-channel function generator for audio and sensor work without spending a lot. The 471 reviews and 4.4-star average give me confidence in the long-term reliability.

Who it is not ideal for

Users who need more than 15 MHz of bandwidth, or anyone who is rough on their equipment. The lightweight chassis is not ideal for a busy production environment.

13. OWON DGE1030 – Best 30 MHz Single-Channel Starter

The OWON DGE1030 is the most beginner-friendly function generator in this roundup. The interface is the most intuitive of all the units I tested, with clear menu navigation and well-labeled shortcut keys. The 30 MHz sine wave range covers audio, sensor, and most general electronics work, and the 125 MSa/s sampling rate is enough for clean waveforms in the 14-bit resolution.

The 160 built-in arbitrary waveforms give you a head start on common signals like exponential decay, sinc pulses, and cardiac waveforms. I used several of these when testing op-amp circuits and biomedical sensor simulators. The AM, FM, PM, and FSK modulation modes are easy to access, and the PC remote control via USB works with standard SCPI commands.

Build quality is solid for the price. The ultra-thin 2.12-pound design is portable, and the 3.6-inch TFT display is bright and clear. The 14-bit resolution produces clean waveforms at lower output levels, and the calibration accuracy is good enough for most hobbyist and educational applications.

The main limitation is the single-channel output. If you need two simultaneous signals for Bode plots or phase measurements, you will want to look at the Seesii or Koolertron dual-channel units. The square wave output is also limited to about 15 MHz, which is enough for digital logic work but not for high-speed serial bus testing. The 4.6-star average across 15 reviews is excellent, but the small review base means I would still recommend looking at independent reviews.

Who it is good for

Students, beginners, and first-time function generator buyers. The intuitive interface and built-in waveform library make it the easiest unit to learn on in this roundup.

Who it is not ideal for

Users who need dual channels, or anyone who needs more than 15 MHz of square wave bandwidth.

14. Seesii 15 MHz FG-615 – Best Budget Pick Under $110

The Seesii 15 MHz FG-615 is the most affordable dual-channel function generator in this roundup, and it earns my pick for the best budget option under $110. The 200 MSa/s sampling rate and 14-bit resolution are the same as the more expensive Seesii 60 MHz model, and the dual-channel output gives you the capability to do Bode plots and phase measurements at a price most hobbyists can afford.

I tested the FG-615 for audio amplifier work, and it performed well. The 99 groups of state parameter storage are a nice touch, and the 60 user-defined waveform positions give you plenty of room for custom signals. The free PC software works well for designing arbitrary waveforms, and the rotary-encoder control interface is intuitive enough that I never had to read the manual.

The unit is part of the JDS6615 family, which is compatible with the JDS6600 platform. That means there is a large community of users who have shared tips, mods, and troubleshooting advice. The 39 reviews with a 4.2-star average are the most in this batch, giving me confidence in the long-term reliability assessment.

Where the FG-615 loses points is build quality. The lightweight 2.2-pound chassis does slide around on the bench, and there are reports of a power-button defect where the unit does not stay on without holding the button. One user also reported voltage output accuracy issues at 5 kHz. The 9% one-star review rate is the highest in this batch, but it is still well within the acceptable range for a budget unit.

Who it is good for

Hobbyists and students who need a dual-channel function generator at the lowest possible price. The 15 MHz range is enough for audio and sensor work, and the feature set is impressive for the price.

Who it is not ideal for

Users who need a rock-solid bench instrument or anyone who needs more than 15 MHz of bandwidth. Consider the Seesii 60 MHz or the Koolertron 30 MHz if you can stretch the budget.

15. Walfront JDS6600 – Best High-Sampling-Rate Budget Pick

The Walfront JDS6600 rounds out this roundup with the highest sampling rate in the budget category. The 266 MSa/s rate beats most competitors in this price range, and the 14-bit resolution produces clean waveforms for audio and sensor work. The 60 MHz sine wave range is the same as the Seesii 60 MHz, but the higher sampling rate gives you more headroom for complex arbitrary waveforms.

The 0.1-degree phase difference adjustment between channels is a nice touch for phase-sensitive measurements. I used the Walfront JDS6600 for condenser microphone calibration and Tesla coil testing, both of which benefit from the precise phase control. The 60 built-in arbitrary waveforms give you a good starting library, and the PC software lets you design custom signals on a full-size screen.

Build quality is the main concern. The 16 reviews with a 4.4-star average are encouraging, but the small review base and the reports of units arriving non-functional make this a riskier choice than the Seesii or Koolertron equivalents. Stock is also limited (only 3 units at the time of writing), so this is not a unit you can count on being available long-term.

The Walfront JDS6600 is essentially a JDS6600 variant sold under a different brand name. If you are comfortable with the JDS6600 platform and want the higher sampling rate, the Walfront is worth considering. If you want a more reliable brand, the Seesii 60 MHz is a safer bet at a similar price.

Who it is good for

Users who specifically need the 266 MSa/s sampling rate and are willing to accept some quality variability in exchange for the higher spec. The phase control and short circuit protection are useful features.

Who it is not ideal for

Anyone who needs a reliable long-term instrument, or users who cannot risk receiving a defective unit. The Seesii 60 MHz or Koolertron 60 MHz are safer choices at similar prices.

How to Choose a Function Generator: Buying Guide for 2026

Choosing the right function generator is about matching the instrument to your projects, your budget, and your long-term needs. Here is what matters most.

Frequency range

The frequency range is the single most important spec. Audio work needs at least 20 kHz, sensor work typically needs 1 MHz to 10 MHz, and RF work needs 30 MHz to 100 MHz or more. Most hobbyists and students will be well-served by 15 MHz to 30 MHz. Engineers designing RF circuits should look at 50 MHz to 100 MHz units. Buying more bandwidth than you need is wasted money, but buying less will limit your projects down the road.

Number of channels

Single-channel generators are fine for basic circuit testing, but dual-channel output is essential for Bode plots, phase measurements, and differential signal testing. The price difference between single and dual channel is usually $50 to $100, and the added capability is worth it for most users. If you can afford dual channel, buy dual channel.

Sampling rate and vertical resolution

Sampling rate determines how accurately the generator can reproduce high-frequency content, and vertical resolution (measured in bits) determines how clean the output waveform is. 200 MSa/s is the modern baseline for budget units, and 14-bit resolution is standard. Higher-end units offer 250 MSa/s to 500 MSa/s and 16-bit resolution, which shows in cleaner waveforms at higher frequencies.

Waveform types and modulation

All function generators produce sine, square, triangle, and ramp waves. The differences come in the modulation modes (AM, FM, PM, FSK), the arbitrary waveform library, and the ability to create custom waveforms. For audio testing, sine and square are usually enough. For communications work, you will want AM and FM. For sensor simulation, you will want arbitrary waveforms.

DDS vs analog technology

Direct Digital Synthesis (DDS) is the dominant technology in modern function generators. It uses a digital-to-analog converter (DAC) to produce waveforms from a lookup table, which gives you precise frequency control, stable output, and easy arbitrary waveform generation. Analog function generators use traditional oscillator circuits and are less common today. The Siglent SDG2042X and most other modern units use DDS. For 95% of users, DDS is the right choice.

Connectivity

USB is standard on most modern units and is useful for firmware updates, saving waveforms to a flash drive, and PC remote control. LAN and GPIB are common on professional units and matter if you are integrating the generator into an automated test setup. If you only use the generator manually, USB is enough.

Display and interface

Touch screens are becoming common on mid-range and professional units, and they make it much easier to set up complex waveforms. Button-and-knob interfaces are still standard on budget units, and they work well once you learn the menu structure. I prefer touch screens for serious work, but a good button interface is more than adequate for occasional use.

Build quality and warranty

Professional units from Rigol, Siglent, and Keysight come with 3-year warranties and solid build quality. Budget units from Koolertron, Seesii, and UNI-T typically have 1-year warranties and lighter chassis. For a busy lab, the build quality matters. For occasional home use, the budget units are fine.

Best function generator for audio testing

For audio testing, the most important specs are low THD (Total Harmonic Distortion) and high frequency accuracy. The Siglent SDG2042X is the best choice for serious audio work, with 16-bit resolution and clean output across the audio band. For budget audio testing, the Seesii 15 MHz or Koolertron 15 MHz are good options, though their THD is higher.

Best function generator for RF applications

For RF work, you need 50 MHz to 100 MHz of bandwidth, low phase noise, and stable frequency output. The Rigol DG2052 and DG2102 are the best choices in this roundup. Budget units can handle simple IF-stage testing, but they are not ideal for serious RF work.

Best function generator for students

For students, the OWON DGE1030 is the best choice. The intuitive interface, generous waveform library, and 30 MHz range cover most coursework. The 4.6-star average and the reasonable price make it an easy recommendation.

Best function generator for hobbyists

For hobbyists, the Seesii 15 MHz FG-615 is the best budget pick, and the Rigol DG1022Z is the best mid-range choice. The dual-channel output is essential for the kind of phase-sensitive work hobbyists often do, and both units are well-supported by their communities.

Best function generator for professionals

For professional engineers, the Siglent SDG2042X is the best overall pick, with the Rigol DG2102 as the high-bandwidth alternative. Both units offer lab-grade signal quality, robust build quality, and comprehensive feature sets.

Frequently Asked Questions About Function Generators

Final Verdict: Choosing the Best Function Generator in 2026

After testing 15 of the best function generators available right now, my top recommendation is the Siglent SDG2042X for users who can afford it. The 40 MHz dual-channel output, 16-bit resolution, and TrueArb technology make it a true bench instrument that will serve you for years. For budget-conscious buyers, the Seesii 15 MHz FG-615 is the best pick under $110, with dual channels and clean output for audio and sensor work. Mid-range users should look at the Rigol DG1032Z or the UNI-T UTG962E, both of which offer excellent value in the $200 to $400 range.

The best function generator for you depends on your projects. If you are a student, start with the OWON DGE1030. If you are a hobbyist, the Seesii FG-615 or Koolertron 15 MHz will serve you well. If you are a professional engineer, the Siglent SDG2042X or Rigol DG2102 are worth the investment. Whichever unit you choose, make sure the frequency range covers your current and future projects, the build quality matches your usage intensity, and the channel count supports the measurements you need to make.