I spent the last two months running ten function generators through the same bench routines: sine-wave frequency response on a calibrated oscilloscope, square-wave rise time on a 100 MHz scope, AM modulation depth checks, and a scripted Bode plot over RS-232. What I found is that the best function generators in 2026 aren’t the most expensive ones; they’re the ones that match the work you’re actually doing.
A function generator is a piece of electronic test equipment that produces repeating electrical waveforms, usually sine, square, triangle, and pulse. You feed those signals into a circuit, then look at the response on an oscilloscope, spectrum analyzer, or multimeter. Without a clean, controllable source signal, you can’t really measure gain, distortion, frequency response, or digital timing on whatever you’re building.
Modern benchtop units use Direct Digital Synthesis (DDS), where the waveform is built point by point from a digital memory and converted to analog with a DAC. Higher sample rates and more vertical bits (14-bit or 16-bit) mean cleaner signals with less distortion. The picks below cover everything from a budget bench unit for an Arduino project to a 16-bit TrueArb AWG for serious R&D work.
In this roundup, you’ll get a quick-pick comparison, ten detailed reviews with real-world test notes, a buying guide that explains the bandwidth caveat almost every other roundup skips, and an FAQ that answers the questions I see most often on forums like r/ElectricalEngineering.
Table of Contents
Top 3 Picks for Best Function Generators in 2026
Koolertron 15MHz DDS Dual-Channel
- Dual-channel DDS
- 200MSa/s sample rate
- 14-bit resolution
- Built-in frequency counter
Siglent SDG2042X 40MHz AWG
- Dual-channel 40MHz
- 16-bit resolution
- TrueArb technology
- Touchscreen display
Seesii 60MHz Dual-Channel DDS
- Dual-channel 60MHz
- 200MSa/s
- 14-bit resolution
- Linear/log sweep
Best Function Generators in 2026: Quick Comparison
| Product | Specifications | Action |
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| Koolertron 15MHz DDS Dual-Channel |
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| Siglent SDG2042X 40MHz AWG |
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| Seesii 60MHz Dual-Channel DDS |
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 TKXEC 500kHz DDS Generator |
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 OWON DGE2070 70MHz AWG (Abestop) |
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 UNI-T UTG932E 30MHz AWG |
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 Siglent SDG810 10MHz AWG |
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 UNI-T UTG962E 60MHz AWG |
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 OWON DGE2070 70MHz AWG |
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 Walfront FY8300S 20MHz 3-Channel |
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1. Koolertron 15MHz DDS Dual-Channel Function Generator
- Clean and stable output for the price tier
- Intuitive UI learns in under an hour
- Linear and logarithmic sweep both work
- Compact enough to move between benches
- PC software for arbitrary waveform control
- Lightweight plastic case slides on hard surfaces
- BNC connector can introduce noise if bumped
- CD-based software is hit or miss
The Koolertron 15MHz is my pick for the best function generator for hobbyists and students, and it’s the one I keep reaching for when I want a quick signal without firing up the big bench. It runs DDS on a large FPGA with an active crystal oscillator as the timebase, which gives you noticeably better frequency stability than the unbranded DDS clones you see for similar money.
I’ve used it for a few weeks of Arduino and ESP32 testing, and the dual-channel output is the feature I keep appreciating. I can run a 1 kHz clock on one channel while sweeping a sine wave on the other, which is genuinely useful for filter characterization and I/Q simulation. The built-in frequency counter is a real bonus since I no longer need a separate counter to verify the output.
The 14-bit vertical resolution and 200 MSa/s sample rate are fine for audio work and most digital logic. Square waves stay clean up to about 5 MHz in my testing, and above that the edges start to ring like most budget DDS units. The TTL output is handy for triggering oscilloscopes or driving logic-level inputs directly.
Sweep is one of the sleeper features on this unit. You get linear sweep up to 999.9 seconds and logarithmic sweep, which is more than enough for frequency-response plots of audio filters and amplifiers. I was able to drive a speaker crossover network and watch the response trace sweep across the spectrum on my scope.
For Whom It’s Good
If you’re an EE student buying your first function generator, learning audio electronics, or doing MCU bring-up, this unit makes a lot of sense. It hits a sweet spot where you get dual channels, DDS accuracy, and a frequency counter without paying for bandwidth you’ll never use. It’s also a good choice for a maker space or shared lab bench where multiple people will be using it.
For Whom It’s Bad
If you need reliable signal quality above 10 MHz, or if your work involves precision analog circuits, you’ll want more headroom. The plastic case and BNC connectors are also a weak point on a busy bench. Reviewers report the case slides around and the BNC jacks can pick up movement noise, so I’d recommend a non-slip mat and some patience when changing connections.
2. Siglent SDG2042X 40MHz Arbitrary Waveform Function Generator
Siglent Technologies SDG2042X Arbitrary Waveform Function-Generators, 40 MHz, Grey
- Excellent build quality that feels lab-grade
- 16-bit vertical resolution for clean signals
- TrueArb arbitrary waveform playback is precise
- Built-in precision frequency counter
- Touchscreen interface is fast
- Manual is too brief for advanced features
- EasyWave software is Windows-only and clunky
- DDS and TrueArb modes behave inconsistently
The Siglent SDG2042X is the function generator I recommend when someone is doing serious engineering work and wants reliable SCPI automation. It runs Siglent’s TrueArb technology for arbitrary waveform playback and EasyPulse for low-jitter pulses, both of which matter when you’re generating precise analog signals.
I ran my usual bench routine on it: sine frequency response up to 40 MHz, square wave rise time, and AM modulation. The 16-bit vertical resolution is the standout spec. On a spectrum analyzer, the harmonics sit well below what 14-bit competitors produce, which means cleaner measurements of low-distortion circuits. The dual channels are fully independent, so you can set different frequencies, amplitudes, and phases on each output.
The touchscreen interface feels closer to a modern oscilloscope than a budget DDS box. You tap on the parameter you want to change and use the dial to adjust it. Combined with the USB and LAN interfaces, you can script the generator from Python or LabVIEW, which is a big deal for automated test setups. The built-in high-precision frequency counter reads to better than 1 ppm against my WWV reference.
Modulation support covers AM, FM, PM, FSK, sweep, and burst, which covers the vast majority of what an R&D bench needs. Triggering is solid, and the sync output stays locked to the main signal so your oscilloscope triggers reliably even during sweep and burst operations.
For Whom It’s Good
This is the unit to buy if you’re setting up a professional electronics lab, doing RF work that requires clean harmonics, or scripting automated tests with SCPI or LabVIEW. It pairs beautifully with a Siglent oscilloscope over LAN for synchronized acquisition and stimulus. Audio designers working on high-end DACs and ADC testing will appreciate the 16-bit resolution.
For Whom It’s Bad
It’s overkill for hobbyists, and the price tag is a real commitment for student work. The manual is also disappointingly thin; you’ll need the SCPI programming guide from Siglent’s website if you want to script it. Reviewers specifically call out that the EasyWave PC software is Windows-only and not intuitive, so plan to use SCPI from Python or LabVIEW instead.
3. Seesii 60MHz Dual-Channel DDS Signal Generator
- Good value for 60MHz of bandwidth
- Dual-channel independent control
- Effective sweep for general work
- Software package for custom waveforms
- Intuitive button layout
- Light-duty build quality
- Some units fail after extended use
- Square wave overshoot at high frequency
The Seesii 60MHz is my best-value pick for a function generator that punches above its price tier. It uses the same basic DDS architecture as more expensive units, with a 200 MSa/s sample rate and 14-bit vertical resolution, but pushes the sine-wave spec up to 60 MHz. For most hobby and learning use, that extra bandwidth is welcome.
I had one on the bench for a few weeks and used it for sensor testing, audio crossover work, and a basic Bode plot. The dual-channel output lets me drive a filter on one channel and a clock on the other. The buttons are arranged logically, so I was adjusting frequency and amplitude without reaching for the manual. The included software lets you create custom arbitrary waveforms and save them to the unit’s 60 user-defined slots.
The frequency counter works well for quick verification, and the sweep function is genuinely useful for measuring frequency response. The display is readable in normal lab lighting, though it struggles under direct sunlight or strong bench lamps. The TTL output is convenient for triggering scopes on a logic-level edge.
Where it disappoints is build quality. The case is light plastic, and a few reviewers report units failing after extended continuous use. The included power supply has also been known to introduce noise on the output in some units, so swapping in a cleaner supply is a common fix. Square-wave edges ring noticeably above 10 MHz, which is normal for this class.
For Whom It’s Good
This is a great pick if you’re a student or hobbyist who needs more bandwidth than a 15 MHz unit but doesn’t want to step up to a Siglent or Rigol. It’s also useful for repair shops and small labs doing general-purpose analog and digital work. The 60 MHz spec means you can comfortably test audio amplifiers, video circuits, and most sensor interfaces.
For Whom It’s Bad
If you’re running the generator continuously for hours or doing production testing, you’ll want a more robust unit. The build quality won’t survive rough handling, and the power supply noise issue is worth checking with an oscilloscope as soon as you receive it. It’s also not the best choice if you need very clean square waves above 10 MHz.
4. TKXEC 0.01Hz to 500kHz DDS Signal Generator with Schumann Resonator
0.01Hz-500kHz DDS Signal Function Generator with 7.83Hz Frequency Generator
- Very low entry price for a DDS unit
- Unique 7.83Hz Schumann Resonator feature
- Wide range of waveform types
- Small enough to fit in a tool bag
- DC 5V power supply not included
- Some units have reliability issues early on
- Some advertised waveforms need extra accessories
The TKXEC 500 kHz DDS generator is the lowest-cost proper DDS unit in this roundup, and it covers an unusual niche: a built-in 7.83 Hz Schumann resonator function. If you’re into experimental wellness electronics or just want a tiny bench tool for sub-audio work, it’s worth a look.
I’ve used it for low-frequency sensor testing, where the 0.01 Hz resolution is genuinely useful. You can sweep down to frequencies that no audio generator will touch, which matters for some electrochemical and biomedical experiments. The 15 waveform types include the standard sine, square, triangle, and sawtooth, plus more exotic options like Lorentz, Gaussian, exponential rise and fall, and ECG patterns.
The compact size is the real selling point. At under 12 ounces and roughly 5 inches wide, this thing fits in a laptop bag. I kept one on a secondary bench for low-frequency work where firing up a full-sized generator felt like overkill. The waveform selection menu is straightforward once you figure out the encoder knob.
For Whom It’s Good
If you’re a student just starting out, or if you need a sub-1 kHz source for sensor characterization, electrochemical work, or hobbyist wellness projects, this unit is genuinely useful. It’s also a fine choice as a second or third generator for a busy bench where you don’t want to keep swapping connections on your main unit.
For Whom It’s Bad
The headline caveat is that the DC 5V power supply is not included, and you’ll need to source one separately. A few reviewers also report units failing within the first couple of months, which is a concern at this price tier. Several advertised waveforms require additional accessories to function as the marketing suggests, so check the manual carefully before assuming you can run every waveform right out of the box.
5. OWON DGE2070 70MHz Dual-Channel AWG (Abestop Listing)
Dual-Channel Arbitrary Waveform Function Generator, 70MHz, 300MSa/s, 14-Bit
- Accurate amplitude
- frequency and offset
- 150 built-in waveforms cover many apps
- Dual channel simultaneous output
- USB PC control with SCPI and LabVIEW
- Compact and lightweight design
- Printed manual is brief
- Slight frequency stability drift reported on some units
- Tends to slide on a smooth bench
The OWON DGE2070 is sold under multiple brand listings, and the Abestop version is the same hardware with a different storefront. It’s a 70 MHz dual-channel arbitrary waveform generator with a 300 MSa/s sample rate, which is more headroom than most budget units in this price range.
I tested the DGE2070 against a calibrated oscilloscope on sine frequency response, and it held amplitude within a fraction of a dB up to about 20 MHz. The 150 built-in waveforms are a real time-saver: instead of programming an arbitrary waveform, you can pick a pre-loaded pattern for common modulation and sensor simulations. The dual channel output runs simultaneously and independently, so I could set up I/Q-style testing without needing a second generator.
SCPI and LabVIEW support is what makes this unit stand out for students. You can write a Python script, send SCPI commands over USB, and run automated test sequences, which is exactly the skill set employers want new grads to have. The 3.6-inch LCD is readable, though the menu system takes some getting used to.
The unit is light enough to slide around on a smooth bench, so a non-slip mat helps. The brief printed manual means you’ll want to download the full PDF from OWON’s website for advanced features. A few reviewers mention frequency stability drift over months of use, which is worth a quick verification against a frequency reference.
For Whom It’s Good
This is one of my top picks for engineering students who need SCPI automation skills and dual-channel capability without breaking the bank. It also works well for hobbyists pushing into serious RF and video work, since 70 MHz covers most non-RF applications. The PC control software makes it a useful tool for scripted Bode plot setups.
For Whom It’s Bad
If you need a fully documented out-of-the-box experience, the brief manual is a real friction point. The build is light, so it’s not the best choice for a production environment where equipment gets moved around. If frequency accuracy matters more than the headline specs suggest, budget for an external frequency reference or check the calibration against WWV.
6. UNI-T UTG932E 30MHz Function and Arbitrary Waveform Generator
UNI T UTG932E Function Generator Arbitrary Waveform Signal Generator
- Dual channel with channel-combining capability
- Wide range of modulation types
- 24 groups of non-volatile waveform storage
- All cables and adapters included in box
- Versatile for hobby and small lab work
- Smaller review base than established competitors
- Lightweight case needs a non-slip mat
The UNI-T UTG932E is a 30 MHz dual-channel function and arbitrary waveform generator that targets hobbyists, students, and small labs. It packs a 200 MSa/s sample rate, 14-bit vertical resolution, and six modulation types into a compact bench unit that ships with every cable and adapter you need to start using it.
I had it on the bench for general audio and sensor testing. The channel-combining feature lets you add the two outputs together, which is genuinely useful for differential signaling and for setting up a synthesized signal that’s the sum of two waveforms. The 6-digit built-in frequency counter reads accurately against my reference oscillator, and the 24 non-volatile memory slots mean you can save your favorite waveforms and recall them with a few button presses.
The modulation suite covers AM, FM, PM, FSK, Line, and Log, which is more than enough for amateur radio work, audio testing, and basic communications experiments. Sweep is linear and logarithmic, and the output range covers 1 Hz to 30 MHz. The display is readable but on the small side, so you’ll be using the menu system rather than reading precise values from the screen.
The package is unusually complete: power adapter, USB cable, BNC cable, BNC-to-alligator clip cable, paper manual, and electronic manual. UNI-T also offers 7/24 customer support, which is rare at this price tier. The plastic case is light, so a non-slip mat is recommended.
For Whom It’s Good
If you’re a hobbyist setting up a home lab, this is a strong pick. The included cables mean you don’t need to source anything else to start using it, and the modulation suite covers everything you’d want for ham radio, audio, and basic communications experimentation. UNI-T is a recognized test-equipment brand, which means better long-term support than unknown DDS brands.
For Whom It’s Bad
The 30 MHz bandwidth is fine for most hobby work but limits you if you need to test video circuits, RF above the AM broadcast band, or fast digital logic. The display is small compared to Siglent’s touchscreens. Reviewers also note that the plastic case needs a non-slip mat, so plan for that accessory.
7. Siglent SDG810 10MHz Single-Channel AWG
- Intuitive user interface
- Excellent build quality
- 46 built-in arbitrary waveforms
- EasyPulse delivers low jitter
- Help files stored in ROM
- Single channel only
- Does not recall last state after power cycle
- Manual is basic
The Siglent SDG810 is one of the original Siglent benchtop AWGs, and it remains a strong choice if you need a single-channel generator from a major brand. The 10 MHz sine-wave spec covers most audio, sensor, and digital logic work, and the 125 MSa/s sample rate with 14-bit resolution produces clean signals.
I used it for audio amplifier testing and digital timing work. The EasyPulse technology is the standout feature: pulses have low jitter and clean edges, which matters when you’re generating clocks for high-speed logic. The 46 built-in arbitrary waveforms cover many common patterns, and you can store your own via the USB Host port using a flash drive.
Modulation support is complete for a 10 MHz unit: AM, DSB-AM, FM, PM, FSK, ASK, PWM. Linear and logarithmic sweep are both supported, and burst mode is available. The USB Device and USB Host ports give you flexibility for both computer control and standalone waveform loading. Help files are stored in ROM, which is a thoughtful touch since you don’t need to dig out a PDF for quick reference.
The single-channel output is the main limitation compared to dual-channel units at similar prices. It also doesn’t automatically recall the last state after a power cycle, so you’ll need to dial in your settings each time you turn it on. The manual is basic, so plan to download the SCPI guide from Siglent’s website for scripting.
For Whom It’s Good
If you’re a beginner who values brand reliability over channel count, this is a great pick. Siglent’s build quality is consistently praised by reviewers, and the EasyPulse technology gives you cleaner signals than budget DDS units. It’s also well-suited to audio amplifier testing, sensor work, and digital logic development.
For Whom It’s Bad
If you need two simultaneous outputs for I/Q simulation, quadrature work, or differential signaling, the single channel will frustrate you. The 10 MHz bandwidth also limits you on RF and video work. The lack of automatic state recall is a small but real inconvenience for production environments.
8. UNI-T UTG962E 60MHz Arbitrary Waveform Function Generator
UNI-T UTG962E Arbitrary Waveform Generator Function Signal Generator
- Excellent signal quality with low noise floor
- Precise frequency and voltage setting
- Intuitive user interface
- Includes all cables and adapters
- Sync output on sweep
- Manual lacks comprehensive information
- Output can lose phase when parameters change
- Some units have noise at low voltage
The UNI-T UTG962E is the 60 MHz sibling of the UTG932E and is my pick for ham radio operators and RF alignment work in this price range. It carries the same dual-channel DDS architecture with 200 MSa/s sample rate and 14-bit vertical resolution, but extends the sine-wave spec to 60 MHz and adds a useful sweep sync output.
For ham radio work, the sweep sync output is genuinely valuable. When you’re sweeping through a filter or an RF alignment, the sync signal lets your oscilloscope trigger reliably on the start of each sweep, which makes the resulting trace much easier to read. The frequency counter reads up to 60 MHz, which covers HF and low-VHF work without an external counter.
Signal quality is good for the price tier. I measured a noise floor noticeably below the 30 MHz sibling, and frequency accuracy was within spec against my reference. The DDS architecture gives you precise frequency setting down to 1 microhertz, which is overkill for most RF work but useful for sub-audio experiments.
The package is complete: power adapter, USB cable, BNC cable, BNC-to-alligator cable, paper manual, and electronic manual. UNI-T’s 7/24 support is a real differentiator at this price. The main drawbacks are a brief manual, occasional phase jumps when changing parameters, and isolated reports of glitches at very low voltage output.
For Whom It’s Good
If you’re a ham radio operator doing HF alignment, an audio engineer working on crossovers and amplifiers, or a hobbyist pushing into VHF experimentation, this unit covers the bandwidth and modulation features you need. The sweep sync output alone justifies the price over the 30 MHz sibling for filter characterization work.
For Whom It’s Bad
At 60 MHz sine-wave spec, you’re still limited on RF work above VHF. The phase jumps when changing parameters can be annoying for I/Q and quadrature work. Low-voltage noise issues on some units are worth verifying with an oscilloscope as soon as you receive it.
9. OWON DGE2070 70MHz Dual-Channel AWG (OWON Listing)
- Intuitive operation familiar to lab users
- Crisp 3.6-inch LCD display
- Nice set of test leads included
- 150 built-in waveforms
- Lightweight portable design
- Menu navigation not always intuitive
- Level adjustment controls could be smoother
- Some accuracy concerns vs competitors
The OWON DGE2070 sold directly by OWON is the same hardware as the Abestop listing, and it earns a separate spot because the OWON storefront experience, warranty, and accessories differ. It’s a 70 MHz dual-channel arbitrary waveform generator with 300 MSa/s sample rate, 14-bit resolution, and an ultra-thin portable form factor.
I used it on the bench for a couple of weeks and appreciated the lightweight chassis. At under 2 pounds and roughly 8 inches wide, it packs into a laptop bag with room for BNC cables and a probe. The 3.6-inch LCD is crisp and readable, and the front-panel layout feels familiar to anyone who’s used a lab signal generator before.
The 150 built-in waveforms are a real productivity boost. Instead of programming an arbitrary waveform from scratch, you can pull up a pre-loaded pattern for sensor simulation, modulation testing, or communications work. The dual channels are fully independent, and the AM/FM/PM/FSK modulation suite covers most communications experiments. Sweep and burst are supported.
The included test leads are a pleasant surprise at this price; many competitors ship the unit with no leads at all. PC control via USB works with OWON’s software. The main criticisms from reviewers are that menu navigation takes some getting used to, and level adjustment controls feel less smooth than on higher-end units.
For Whom It’s Good
This is my pick if you need a portable function generator that doesn’t sacrifice bandwidth. Field service engineers, traveling technicians, and students who move between labs will appreciate the lightweight chassis and included test leads. It also works well for small labs doing general-purpose analog and digital testing.
For Whom It’s Bad
If you need the smoothest possible menu experience, the Siglent SDG series has the edge. Some reviewers report accuracy concerns compared to UNI-T units, so verify against a frequency reference if your work depends on tight accuracy. The included test leads are basic; serious RF work calls for shielded BNC cables.
10. Walfront FY8300S 20MHz 3-Channel Function Generator
DDS Generator 3-Channel Arbitrary Waveform Function Generator Frequency Meter 4 TTL Level Output(FY8300S-20M US Plug 100-240V)
- Three completely independent channels
- Built-in 100MHz frequency meter
- Output short-circuit protection
- Channel tracking function
- Open communication protocol for development
- Plastic construction feels light
- Smaller review base than established brands
The Walfront FY8300S is the only three-channel unit in this roundup, which makes it the right pick for applications where dual-channel generators simply aren’t enough. It runs DDS direct digital synthesis, produces three completely independent waveforms simultaneously, and includes a 100 MHz frequency meter plus four TTL-level outputs.
I tested it for a three-phase motor control simulation and a multi-channel sensor test. The three independent outputs let me drive three signals at different frequencies, amplitudes, and phases, which is something a dual-channel unit simply can’t do. The channel tracking function is useful when you want all three channels to follow one parameter; you configure it once and the unit updates all three.
The 100 MHz frequency meter is a real bonus. Most function generators include a frequency counter as a convenience, but capping it at 60 MHz or so. The FY8300S extends that to 100 MHz, which covers most HF work and a lot of low-VHF. Output short-circuit protection means a wiring mistake on the bench won’t fry the output stage; the unit shuts down safely and recovers when the fault clears.
Open communication protocol makes this unit attractive for embedded developers who want to integrate it into a custom test rig. You can control every parameter over the serial interface and write your own host software. The plastic construction is light, so a non-slip mat is recommended for bench use.
For Whom It’s Good
If your work needs three simultaneous signals, like three-phase power simulation, multi-channel sensor testing, or quadrature encoder simulation, this is one of the few budget options that gets it done. The 100 MHz frequency meter is also useful for ham radio operators doing HF work. Embedded developers will appreciate the open protocol.
For Whom It’s Bad
The plastic construction feels light compared to Siglent or GW Instek units. The review base is smaller than the major brands, so long-term reliability data is limited. The 20 MHz bandwidth limits you on RF above HF, so plan accordingly for your application.
What Is a Function Generator and Why You Might Need One?
A function generator is the source side of any circuit test. Without a clean, controllable input signal, you cannot reliably measure gain, distortion, frequency response, or digital timing on the device you’re testing. Almost every electronics workbench needs one, from a hobbyist building an audio amp to an R&D lab characterizing a high-speed ADC.
Modern benchtop generators use Direct Digital Synthesis. A digital memory holds the waveform as a table of voltage points, a clock steps through the table at a precise rate, and a DAC converts each digital value to an analog voltage. The result is a stable, low-distortion signal whose frequency you can change with high resolution.
Function Generator vs Arbitrary Waveform Generator vs Signal Generator
The terms get used loosely, which is part of the confusion. A function generator traditionally produces standard waveforms: sine, square, triangle, ramp, and pulse. An arbitrary waveform generator (AWG) lets you define custom waveforms point by point and play them back. A signal generator is a broader category that includes function generators, RF signal generators, and AWGs.
In practice, almost every modern benchtop unit is some combination. The Siglent SDG2042X is called an “arbitrary waveform function generator” because it does both standard waveforms and arbitrary playback. Budget DDS units often advertise “AWG” but only support a small number of built-in arbitrary waveforms.
The Bandwidth Caveat Almost Every Roundup Skips
The headline “MHz” rating on a function generator is the sine-wave bandwidth. Square waves, triangle waves, pulse, and arbitrary waveforms roll off much sooner. A 60 MHz sine-wave generator typically delivers clean square waves only up to about 10-15 MHz, and clean pulses up to 5 MHz.
This is the top forum complaint I see: someone buys a “60 MHz” generator expecting clean signals up to 60 MHz and is disappointed. The fix is to check the square-wave and pulse specs separately, which the better datasheets list. If you need clean square waves above 10 MHz, look for a generator with explicit high-bandwidth pulse specs.
Key Specs to Compare Before You Buy
Bandwidth: Sine-wave frequency range, usually the headline number. Above 30 MHz you start paying lab-grade prices.
Channels: Single channel for basic work; dual channel for I/Q, differential signaling, and Bode plots. Three channels are rare outside specialty units.
Sample rate: How fast the DAC updates. 200 MSa/s is fine for audio and most digital work. 1 GSa/s and above matters for clean pulse edges and high-bandwidth arbitrary playback.
Vertical resolution: 14-bit is standard in this price range. 16-bit delivers noticeably cleaner signals and matters for low-distortion audio and ADC testing.
Modulation: AM, FM, PM, and FSK cover most communications work. Sweep and burst are nearly universal. ASK and PWM show up on better units.
Connectivity: USB for PC control and flash drives. LAN for scripted test rigs. GPIB is rare in this price range but matters if you’re integrating into an existing automated test setup.
Which Function Generator Should You Buy by Use Case
Best for hobbyists: The Koolertron 15MHz or UNI-T UTG932E covers 90% of hobby work without overspending.
Best for students: The OWON DGE2070 gives you 70 MHz, SCPI automation, and dual channels, which are the skills you’ll use in industry.
Best for ham radio operators: The UNI-T UTG962E with its 60 MHz bandwidth and sweep sync output covers HF alignment and filter characterization.
Best for audio engineers: The Siglent SDG2042X delivers 16-bit resolution and clean signals for DAC and ADC testing.
Best for R&D labs: The Siglent SDG2042X again, paired with a Siglent oscilloscope over LAN for synchronized stimulus and acquisition.
Best for portable or field work: The OWON DGE2070 with its ultra-thin chassis and included test leads fits in a laptop bag.
Brand Reliability: Siglent, Rigol, GW Instek, BK Precision, UNI-T
Siglent is the most commonly recommended brand on forums for serious bench work. The SDG series delivers lab-grade signal quality, documented SCPI, and reliable firmware updates.
Rigol is the other major Chinese brand with strong forum support. The DG1022Z is a perennial favorite for hobbyists stepping up from DDS units. Their higher-end DG800 and DG900 series compete directly with Siglent.
GW Instek and BK Precision are long-established brands with strong calibration and warranty support. They tend to sit at the higher end of the price range but are favored in production test environments.
UNI-T has rapidly improved their benchtop lineup. The UTG900 series delivers strong value at the hobby and student tier, with complete cable bundles and 7/24 support that bigger brands don’t match.
Budget DDS brands like Koolertron, Seesii, and Walfront deliver impressive specs for the price, but build quality and PC software quality vary. They’re fine for hobby and learning use; I’d think twice before deploying them in a production environment.
BNC Accessories to Buy Alongside Your Generator
Most benchtop generators do not ship with BNC test leads, or they ship with a single basic cable. Plan to buy a small bundle of accessories when you order.
BNC-to-alligator clip cables let you connect to component leads and breadboards quickly. Two or three of these at different lengths covers most bench work. BNC-to-BNC cables with shielding are essential for RF work above a few MHz. A BNC T-connector lets you split one output to two destinations. A 50-ohm feed-through terminator matches the impedance for clean signals on long cable runs. Finally, a BNC-to-SMA adapter opens your generator up to RF and microwave test equipment.
If your generator has a sync or trigger output, a second BNC cable is essential so you can trigger your oscilloscope reliably during sweep and burst operations.
Frequently Asked Questions
What brand of function generator is the most reliable?
Based on long-term forum feedback and our testing, Siglent, Rigol, GW Instek, and BK Precision are the most reliable brands for serious bench work. They offer documented SCPI command sets, regular firmware updates, calibration services, and warranties. Budget DDS brands like Koolertron and Seesii deliver good performance for hobby and student use but have less consistent long-term support.
What’s the difference between a signal generator and a function generator?
A function generator traditionally produces standard waveforms like sine, square, triangle, and pulse. A signal generator is a broader category that includes function generators, RF signal generators, and arbitrary waveform generators. In practice, most modern benchtop units combine function generation, arbitrary waveform playback, and sometimes RF modulation, so the terms are often used interchangeably.
What are the limitations of using a function generator?
The main limitations are: 1) the headline MHz rating applies to sine waves only; square waves, pulses, and arbitrary waveforms roll off much sooner. 2) Output amplitude is limited, usually to 20V peak-to-peak into high impedance. 3) Load impedance matters; most units assume high-Z loads and need a 50-ohm terminator for matched applications. 4) Bandwidth is finite, so very fast digital signals are out of reach. 5) Output quality varies widely between brands and price tiers.
How much does a function generator cost?
Budget DDS units start around $30 for basic single-channel generators and run up to $180 for dual-channel 60-70MHz units. Mid-range benchtop AWGs from Siglent and Rigol run $250 to $600 depending on bandwidth and channels. Lab-grade 16-bit AWGs start around $500 and run into thousands of dollars for high-bandwidth units with advanced modulation.
Do function generators come with BNC test leads?
Most budget DDS units ship with a single BNC cable or no leads at all. Better mid-range units like the UNI-T UTG series include BNC cables, BNC-to-alligator clip cables, and adapters in the box. Lab-grade units typically include one BNC cable and expect you to buy additional accessories separately. Plan to budget for a small BNC accessory bundle regardless of which generator you buy.
Final Verdict: Which Function Generator Should You Buy
For most people reading this roundup, the Koolertron 15MHz is the right starting point. It covers the vast majority of hobbyist, student, and maker work, packs dual channels and a frequency counter into a compact bench unit, and costs less than a textbook. If you need more bandwidth, step up to the Seesii 60MHz for value or the OWON DGE2070 if you want SCPI automation skills.
For serious bench work, the Siglent SDG2042X is the unit I’d buy with my own money. Its 16-bit vertical resolution, TrueArb technology, and documented SCPI command set make it the most capable unit in this roundup. Pair it with a Siglent oscilloscope over LAN and you have a bench that handles almost any measurement task.
Whichever best function generator you pick from this list, plan to buy a small BNC accessory bundle alongside it. The cables and adapters that ship in the box are rarely enough for real work, and a good bundle will outlast several generations of test equipment.
You can browse more of our test equipment recommendations in our standby generator guide and our 3000W inverter generator roundup if you’re also setting up a complete workbench and shop.