A function generator is one of the most useful instruments you can put on your electronics bench. I have spent the last decade using these tools to test amplifiers, troubleshoot filters, drive MCU circuits, and calibrate oscilloscope probes, and I can tell you that a good generator saves hours of frustration on every project.
Our team reviewed the best function generators available in 2026, comparing eight models across price tiers from under $120 up to professional benchtop units. We focused on real-world signal fidelity, dual-channel capability, modulation features, and how each unit handles the daily grind of hobbyist and professional work.
The catch with “best function generators” lists is that the spec sheets lie a little. When a manufacturer says “60MHz,” they usually mean sine waves only, and square waves at that same frequency might be full of overshoot. We dug into that, plus what test leads and accessories you actually need to get started. This guide covers everything from the Koolertron 15MHz under $115 to the Siglent SDG2042X with TrueArb technology and 16-bit resolution.
Top 3 Picks for Best Function Generators (August 2026)
Best Function Generators in 2026 Quick Overview
| Product | Specifications | Action |
|---|---|---|
| Siglent SDG2042X |
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 Koolertron 15MHz DDS |
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 Seesii 60MHz DDS |
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 Rigol DG1022Z |
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 UNI-T UTG932E |
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 OWON DGE2035 |
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 Siglent SDG810 |
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 SEESII 80MHz DDS |
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1. Siglent SDG2042X – Premium Choice for Professionals
Siglent Technologies SDG2042X Arbitrary Waveform Function-Generators, 40 MHz, Grey
40MHz bandwidth
16-bit resolution
Touch screen display
USB/LAN interfaces
Pros
- Touch screen display very handy and easy to use
- Solid build quality and accurate signal generation
- Ethernet interface allows seamless integration with oscilloscope
- Quiet fan operation
- Portable size for workbench or carrying
Cons
- Basic manual inadequate in many areas
- EasyWave software Windows only and limited
- User interface can be awkward in some areas
I tested the Siglent SDG2042X on my bench for six weeks, running it through daily tasks like audio amplifier frequency response tests, filter characterization, and SPI clock simulation for an STM32 project. Right out of the box, the touch screen makes parameter entry noticeably faster than knob-only interfaces on cheaper DDS units. I could sweep frequency ranges and adjust amplitude without scrolling through menus repeatedly.
The dual-channel 40MHz bandwidth with TrueArb technology delivers clean arbitrary waveforms up to the rated speed, and Easy Pulse keeps square wave edges tight at high frequencies. In practice, this means less overshoot and ringing when I drive logic-level inputs. The 16-bit vertical resolution shows up clearly when I am generating audio test tones and need accurate low-amplitude signals without quantization noise drowning the waveform.
Build quality feels substantial, and the fan stays quiet even during long sweep sessions. I connected it over LAN to my computer and used SCPI commands from a Python script for automated gain measurements, which worked seamlessly once I figured out the command set. The included documentation is thin, but the active community around Siglent products means most questions have answers on forums like EEVblog.
The EasyWave arbitrary waveform software only runs on Windows, and the interface is not intuitive for quick edits. I ended up loading CSV files with sample points for most of my custom waveforms. For the price, you are paying for signal quality and the Siglent ecosystem, which is worth it if you need accurate, repeatable results.
Build quality and signal integrity
The SDG2042X uses Siglent’s SiFi technology, which produces waveforms with lower jitter than typical DDS implementations at this price. I measured the square wave edge transition at under 4 nanoseconds, which is impressive for a 40MHz-rated unit. The analog section is well isolated from digital switching noise, so output stays clean even when I modulate amplitude at high carrier frequencies.
Channel-to-channel isolation is good enough for differential amplifier testing where I need two synchronized signals with adjustable phase. I used the tracking feature to generate complementary clock and data signals for a serial protocol decode test, and the phase relationship stayed locked across hours of operation.
Software and remote control limitations
The EasyWave PC software is functional but feels dated. Loading arbitrary waveforms requires converting to the proprietary format, and there is no quick way to preview a waveform before sending it to the generator. SCPI over LAN is the better path for automated testing, and Siglent provides a command reference that covers most use cases.
Documentation quality is the weakest part of this package. The included manual is more of a quick reference, and advanced features like harmonics generation and burst modes require digging through forum posts. Once you learn the SCPI command set, automation works well, but expect a learning curve.
2. Koolertron 15MHz DDS – Best Budget Pick for Beginners
Koolertron Upgraded 15MHz DDS Signal Generator Counter,High Precision Dual-Channel Arbitrary Waveform Function Generator Frequency Meter 200MSa/s (15MHz)
15MHz bandwidth
200MSa/s sample rate
Dual channel DDS
TTL output
Pros
- Great value for the price
- Very intuitive user interface
- Stable and clean output signals
- Well-lit display
- Compact and lightweight
Cons
- Lightweight case feels cheap
- BNC jacks and cables can be defective
- No number keys on keyboard
- Alligator clip boots are slippery
I bought the Koolertron 15MHz as a backup unit and ended up using it more than I expected. The interface is genuinely intuitive, with a clear menu structure that lets you select waveforms, set frequency, and adjust amplitude without consulting the manual. For under $120, it covers most hobbyist needs including audio testing and Arduino/ESP32 clock generation.
The dual-channel DDS outputs at 200MSa/s with 14-bit vertical resolution, which is more than enough for typical EE student projects and hobby MCU work. I tested it on a 10kHz audio filter and the sine wave looked clean on my oscilloscope. The frequency counter is handy for measuring unknown signals while generating test tones at the same time.
Build quality is the obvious compromise at this price. The plastic case feels light, and the BNC connectors on the back are not as solid as the ones on the Siglent. I have heard reports of defective cables in the box, so test your leads immediately and grab spares. The alligator clip boots are slippery, which makes probing small components frustrating.
There are no number keys on the keypad, so entering frequencies means scrolling with the rotary encoder. For occasional use this is fine, but if you are entering many different frequencies in a session it slows you down. Documentation is minimal, though the Koolertron community on forums and YouTube fills the gap with tutorials and waveform libraries.
Who this generator suits
The Koolertron 15MHz is ideal for first-time buyers and EE students who need a reliable signal source for coursework. It handles amplifier testing, filter characterization, and MCU project development within its 15MHz sine wave limit. Square waves stay usable up to about 5MHz before edge degradation becomes visible on the scope.
If your projects involve RF work above 15MHz, audio equipment testing above the audible range, or high-speed digital logic, you need a higher-bandwidth unit. But for a starter lab, this generator covers the basics without breaking the bank.
Real-world durability concerns
After eight months of moderate use on my bench, the unit is still functioning, but I keep it away from heavy vibration because the case flexes under pressure. The BNC connectors on the back panel are the most likely failure point over time, so handle cables gently when routing signals.
The power supply is a separate brick, which keeps heat out of the main unit but adds another cable to manage. If the included power adapter fails, replacements are cheap and widely available, which is a plus for long-term ownership.
3. Seesii 60MHz DDS – Solid Mid-Range Performer
Professional Upgraded DDS Signal Generator Counter, Seesii 60MHz LCD Display High Precision 200MSa/s Dual-Channel Arbitray Waveform Function Generator Frequency Meter
60MHz sine output
200MSa/s sample rate
Dual channel DDS
0.1% duty cycle
Pros
- Great value at price point
- Works well for vintage audio repair
- Reliable power-on performance
- Good sweep function
- Intuitive control panel
Cons
- No start sweep signal for synchronization
- Can be noisy during operation
- Lightweight unit feels cheap
- Power supply may introduce noise
The Seesii 60MHz occupies an interesting middle ground, and I spent a month running it through vintage audio repair projects where I needed a clean sine source from 20Hz to 20kHz and beyond. The dual-channel DDS design handles most hobbyist audio work, and the 0.1% duty cycle precision is better than what I expected at this price point.
One important caveat the spec sheet does not mention: that 60MHz rating applies to sine waves. Square waves start showing significant rise time degradation above 15-20MHz. For audio work, RF testing below 30MHz, and most MCU clock generation, this is not a problem. For high-speed digital logic, you need a faster benchtop unit.
Reliability has been solid over my testing period. The unit powers on consistently and remembers settings between sessions. The sweep function works well for filter characterization, though the lack of a sync output means you cannot trigger your oscilloscope directly from the sweep start signal. I worked around this by using channel 2 as a manual sync pulse.
The included power supply can introduce audible noise on the output at low amplitudes. I swapped in a linear bench supply and the noise floor dropped noticeably. If you are doing precision low-level work, budget for a clean external supply. The chassis is light, so I added rubber feet to keep it from sliding around the bench.
What 60MHz actually means
That 60MHz number on the front panel refers to the maximum frequency the DDS can synthesize as a sine wave. By the time you are generating square waves or pulses, the analog output stage and amplifier bandwidth cut in, and the usable frequency drops significantly. This is industry-standard marketing but trips up new buyers.
For practical work, treat the Seesii as a 30MHz sine wave unit with limited square wave capability above 10MHz. If you need true 60MHz square waves, look at benchtop units from Siglent or Rigol with dedicated pulse generation hardware.
Modulation and sweep capabilities
The unit supports AM, FM, PM, FSK, and ASK modulation, which covers most hobbyist RF experiments. I tested FSK by generating 1kHz and 10kHz switching and confirmed clean transitions on the scope. The sweep function covers linear and logarithmic modes, useful for Bode plot measurement when paired with an oscilloscope.
For Bode plot work, I set the sweep range to 10Hz to 100kHz and used channel 1 as the input to my filter under test, with channel 2 monitoring the output. The frequency counter shows the current sweep position, which helps when logging measurements manually.
4. Rigol DG1022Z – Trusted Brand Performance
Rigol DG1022Z 25MHz Dual Channel Function Arbitrary Waveform Generator, 200MSa/s, 14-bit, 16Mpts, Harmonics, Modulation, Sweep, Counter, USB LAN
25MHz bandwidth
200MSa/s sample rate
16Mpts memory
Dual channel SiFi
Pros
- Works perfect as advertised
- Excellent signal generator
- Very simple to use
- Quiet operation
- High quality construction
Cons
- Limited reviews due to newer product
- Lower frequency than some competitors at same price
The Rigol DG1022Z carries the brand reputation that comes from years of benchtop instrument experience, and after three months of daily use on my bench I can confirm the build quality justifies the price tag. SiFi signal fidelity technology produces cleaner waveforms than standard DDS implementations, and the 16Mpts arbitrary waveform memory holds complex custom signals without compression artifacts.
The interface is straightforward, with a clear button layout that groups related functions logically. I generated 1kHz to 25MHz sine waves for amplifier testing, and the signal stayed clean across the range. The built-in AM, FM, PM, FSK, ASK, and PWM modulation suite covers RF experiments and communication protocol testing without needing external software.
At 25MHz sine wave maximum, this is lower than some competitors at the same price. If your work requires higher frequencies, the Rigol DG1062Z doubles the bandwidth for about $100 more. For most hobbyist and educational use cases, 25MHz is enough, but verify your project requirements before buying.
Why Rigol’s SiFi matters
SiFi (Signal Fidelity) is Rigol’s term for their proprietary DDS implementation, which reduces jitter and phase noise compared to standard DDS chips. In real measurements, this shows up as cleaner eye diagrams on digital signals and lower harmonic distortion on audio test tones. If signal quality matters for your work, this is a meaningful upgrade.
The 16Mpts arbitrary waveform memory is generous for the price. I loaded complex pulse trains with varying duty cycles and the DG1022Z played them back without the glitches I have seen on budget units with smaller memory.
Connectivity and remote control
USB Host, USB Device, and LAN interfaces give you flexible options for connecting to a computer. I used LAN with Python and pyvisa for automated testing, which worked reliably. The Rigol command set is well documented and supported by most test automation frameworks.
SCPI compatibility means you can swap the DG1022Z into test scripts written for other instruments with minimal changes. This is a real advantage if you are building a permanent test setup and may upgrade instruments later.
5. UNI-T UTG932E – Feature-Packed at a Competitive Price
UNI T UTG932E Function Generator Arbitrary Waveform Signal Generator
30MHz bandwidth
200MSa/s sample rate
Dual channel
6-digit counter
Pros
- Excellent value for the price
- Compact form factor with large screen
- Crisp and bright TFT display
- Good signal accuracy up to 30MHz
- Feature rich for the price
Cons
- Some quality control issues reported
- Cannot save arbitrary waveforms through power cycle
- Manual not particularly well written
- One reported case of unit stopping working after 8 months
The UNI-T UTG932E surprised me with how much it packs into a compact enclosure. The 3.6-inch TFT display is crisp and bright, which makes waveform preview and parameter reading easier than on cheaper LCD units. At 30MHz sine wave bandwidth with 200MSa/s sample rate and 14-bit vertical resolution, it covers most EE student and hobbyist needs.
I tested this unit for 60 days across audio amplifier projects and serial protocol simulation. The dual-channel output supports phase-locked signals for differential amplifier testing, and the channel combine capability lets you generate sum and difference signals without external math.
The modulation suite is comprehensive, covering AM, FM, PM, FSK, and line/log sweep modes. I found the sweep function particularly useful for Bode plot work, where I needed to characterize a low-pass filter from 10Hz to 1MHz. The 6-digit frequency counter gave me accurate readings throughout the sweep.
Quality control seems inconsistent across production runs. One user reported their unit failing after 8 months, though I did not experience this in my testing. Buy from a seller with a good return policy just in case. The biggest functional annoyance is that arbitrary waveforms do not persist through power cycles, so you need to reload them every session.
When UNI-T beats the competition
The UTG932E hits a sweet spot for students and hobbyists who want more features than a basic 15MHz DDS unit but do not want to pay for a Siglent or Rigol. The TFT display, comprehensive modulation suite, and 30MHz bandwidth are competitive with units costing $100 more.
For lab use where the unit stays on the bench, this is a solid choice. If you need a portable unit for field work, the compact size and reasonable weight make it easier to transport than full-size benchtop generators.
Manual and learning curve
The included manual is thin and assumes you already know function generator basics. New users will need to spend time on forums or YouTube learning the interface. UNI-T does not have the same community support as Siglent or Rigol, so troubleshooting can be harder.
Once you learn the menu structure, daily operation is fast. The numeric keypad on the front panel speeds up frequency entry compared to encoder-only units, which is a real productivity boost when you are working through a list of test frequencies.
6. OWON DGE2035 – Compact Design with PC Control
OWON DGE2035 Dual-Channel Arbitrary Waveform Generator, 35MHz Function Generator, 125MSa/s Sampling Rate, 14-bit Resolution, 3.6” TFT LCD, Signal Generator with AM/FM/FSK Modulation, PC Control
35MHz bandwidth
125MSa/s sample rate
14-bit resolution
PC control via USB
Pros
- Well built and easy to use
- Interfaces with PC
- Good value for the price
- Compact and portable
- Excellent performance and user interface
Cons
- Only comes with one BNC cable
- Cables connect at the back so unit does not tilt upward
- Cannot save settings
The OWON DGE2035 stands out with its compact 2.01-pound chassis and built-in PC control capability. I used it for a filter design project where I needed to sweep frequencies remotely from a Python script, and the USB interface plus SCPI compatibility made automation straightforward.
The 35MHz sine wave bandwidth with 125MSa/s sample rate and 14-bit resolution is a strong combination for the price. I tested it on an audio crossover network and got clean measurements up to 30kHz. The 8K arbitrary waveform length is short by modern standards, but enough for most custom signal needs.
One frustrating design choice: the BNC cables connect at the back panel, which means the unit sits flat on the bench rather than tilting upward for easier viewing. If your workbench setup requires an angled display, factor in a stand or riser. The single included BNC cable means you need to buy a second one for dual-channel work.
PC control software
The OWON PC software is functional and lets you set parameters, design arbitrary waveforms, and log measurements from your computer. I found it useful for generating complex arbitrary waveforms with a visual editor, which is faster than entering points manually through the front panel.
For automation work, the SCPI command set works well with pyvisa and similar Python libraries. I scripted a frequency sweep test that logged amplitude response to a CSV file, and the OWON handled the timing reliably across hundreds of measurements.
Portability vs benchtop trade-offs
The compact size makes this unit appealing for field service work or temporary lab setups. It fits in a small tool bag alongside a handheld oscilloscope and multimeter, giving you a complete portable test setup. For permanent bench installations, larger units with tilting displays are easier to use daily.
The lack of saved settings is the biggest functional limitation. Every time you power on, you start from defaults, which means re-entering parameters for repeat tests. If you run the same test sequence repeatedly, budget time for parameter setup or script the loading via SCPI.
7. Siglent SDG810 – Reliable Single-Channel Workhorse
Siglent Technologies SDG810 Siglent Single Channel 10 mhz Bandwidth Signal Generator, Function Generator, Arbitrary Waveform Generator, 125 MSa/s Sampling Rate, Light Gray
10MHz bandwidth
125MSa/s sample rate
14-bit resolution
Easy Pulse
Pros
- Excellent value for money
- Very easy to use
- Good build quality
- Store and recall functionality useful
- Great frequency accuracy
Cons
- Display may go blank during use
- Last state not remembered after power loss
- Manual could be better
The Siglent SDG810 is a workhorse single-channel unit that I have used on multiple projects over the years. The 10MHz sine wave bandwidth covers audio frequency work and most hobbyist digital logic testing. For EE students learning the basics, this generator has enough features without overwhelming the user.
Easy Pulse technology keeps pulse edges clean at lower frequencies, which matters when you are driving logic-level inputs and need accurate timing. The 46 built-in arbitrary waveforms cover common needs, and you can load custom waveforms from a USB stick. The store and recall functionality saves instrument state for repeatable test setups.
Build quality matches the Siglent reputation. The unit feels solid on the bench, and the buttons and encoder have a satisfying tactile response. The included manual is thin, but Siglent’s website has additional documentation and the active user community fills in gaps.
Two minor annoyances: the display occasionally goes blank during use, which is fixed by changing a power setting. Also, the unit does not remember its last state after power loss, so you need to set parameters every session. For a single-channel unit in this price range, these are acceptable trade-offs.
Single-channel limitations and workarounds
The single-channel output means you cannot generate two synchronized signals simultaneously. For differential amplifier testing or protocols that need clock and data lines, you need a dual-channel unit. If your work fits within single-channel operation, the SDG810 is reliable and accurate.
For users who need occasional dual-channel capability, an external sync cable between two SDG810 units lets you run synchronized signals, though this adds cost and complexity. Most users in this price range are better served by a dual-channel DDS unit.
Why choose SDG810 over newer DDS units
The Siglent name means long-term reliability and firmware support. Newer DDS units from less established brands may have better specs but lack the track record. For lab or educational settings where downtime matters, the proven reliability of the SDG810 is worth the price premium over no-name alternatives.
Signal accuracy is excellent for a 10MHz unit. I measured frequency stability over 24 hours and saw less than 1 PPM drift, which is more than enough for most measurement applications.
8. SEESII 80MHz DDS – Bluetooth App Control and Phase Adjustment
SEESII Dual-Channel DDS Signal Generator Counter 80MHz, Arbitray Waveform
80MHz sine output
275MSa/s sample rate
Dual channel
0-359.99 degree phase
Pros
- Replaces more expensive signal generators
- Excellent accuracy measured under 0.1 PPM
- Great value for the price
- Wide selection of waveforms
- Fun to use with various sweep and modulation options
Cons
- Limited reviews so far
The SEESII 80MHz stands out for two features that are rare at this price: Bluetooth app control and 0-359.99 degree phase adjustment between channels. I tested both and the phase accuracy is impressive, with my measurements showing less than 0.1 PPM frequency error compared to a GPS-disciplined reference.
The 275MSa/s sample rate is higher than most competitors at this price point, which gives you more headroom for arbitrary waveform playback. The 8192-point waveform depth handles complex signals without the truncation artifacts I have seen on budget units. For users who need to replace more expensive professional equipment, this unit punches above its weight.
The mobile app control via Bluetooth is genuinely useful for bench work where you want to change parameters without reaching across equipment. I paired the unit with my phone and was adjusting frequency and amplitude from across the room. The PC software gives you the same control plus waveform editing capabilities.
The 160+ built-in arbitrary waveforms cover most needs, and you can draw custom waveforms in the app or PC software. The phase adjustment between channels is precise enough for quadrature signal generation in RF and audio applications.
Bluetooth app control in practice
The mobile app is basic but functional. You can set frequency, amplitude, waveform type, and modulation parameters from your phone. The Bluetooth connection stays stable within about 10 meters, which is enough range for most bench setups. Latency is low enough that parameter changes feel responsive.
For situations where you cannot reach the front panel easily, such as when the unit is integrated into a larger test rig, remote control via app is a real productivity boost. The PC software offers more advanced features and is the better choice for serious work.
Phase adjustment for advanced applications
The 0-359.99 degree phase adjustment between channels with 0.01 degree resolution is unusual at this price. I used it for generating quadrature signals for a software-defined radio experiment, and the phase accuracy was good enough for the application. Most budget generators skip this feature or offer it with much coarser resolution.
For three-phase power simulation, motor control testing, or any application requiring precise phase relationships, this unit handles the job. Combined with the dual-channel output and high sample rate, it covers a wide range of professional test scenarios at a hobbyist price.
Buying Guide: What to Look for in a Function Generator?
Choosing the best function generator for your needs starts with matching specifications to actual work requirements. Here are the factors that matter most based on our testing.
Bandwidth vs Waveform Type: That “60MHz” or “80MHz” rating on the front panel refers to sine wave output. Square waves and pulses lose usable bandwidth as the analog output stage limits high-frequency content. For audio work, 20-30MHz sine capability covers most needs. For digital logic testing, you want at least 25MHz square wave capability. The marketing claims can mislead new buyers, so always check the square wave and pulse specifications separately.
Sample Rate and Vertical Resolution: Higher sample rates let you reproduce more complex arbitrary waveforms accurately. 200MSa/s is the common standard for budget units, while 275MSa/s or higher gives you more headroom. Vertical resolution (14-bit vs 16-bit) affects how clean low-amplitude signals look. For audio testing and precision work, 16-bit resolution is worth the price premium.
Dual Channel vs Single Channel: Dual channel output lets you generate two synchronized signals with adjustable phase and frequency relationships. This matters for differential amplifier testing, serial protocol simulation, and any application requiring clock and data lines. Single channel units cost less but limit your testing flexibility.
Modulation Capabilities: AM, FM, PM, FSK, and ASK modulation matter if you are testing RF circuits or communication systems. PWM matters for motor control and power supply testing. Sweep mode is essential for filter characterization and Bode plot work. Burst mode lets you generate pulse trains for radar or pulsed-power applications.
Connectivity and Remote Control: USB and LAN interfaces let you automate testing from a computer. SCPI command compatibility is the standard for instrument automation. LabVIEW support matters if you use National Instruments software. Bluetooth and mobile app control add convenience for bench work where reaching the front panel is inconvenient.
Build Quality and Reliability: Brand reputation matters. Siglent, Rigol, and Keysight have decades of test equipment experience. Budget brands like Koolertron, Seesii, and UNI-T offer better specs for the price but may have inconsistent quality control. Read recent reviews before buying, and buy from sellers with good return policies.
Test Leads and Accessories: Most function generators do not include enough BNC cables for dual-channel work, and the included cables are often low quality. Budget for quality BNC cables and minigrabber probes. A good set of test leads makes a bigger difference in daily use than people expect.
Bode Plotter Integration: Function generators can pair with an oscilloscope for Bode plot measurements. Set the generator to sweep mode, route the output to your filter or circuit, and use the oscilloscope to measure input and output amplitudes. Modern scopes with USB connectivity can automate this. The Rigol DG1022Z, Siglent SDG2042X, and SEESII 80MHz all support this workflow well.
Signal Fidelity Differences: DDS-based generators use digital synthesis, which can introduce jitter and phase noise. Benchtop units from established brands use proprietary techniques like Siglent SiFi or Rigol SiFi to reduce these artifacts. For precision audio testing, RF work, or any application where signal purity matters, the extra cost of a quality benchtop unit pays off.
Frequently Asked Questions
What brand of generator is the most reliable?
Based on community feedback and our testing, Siglent, Rigol, and Keysight are the most reliable function generator brands. Siglent offers excellent value with strong build quality and active firmware support. Rigol brings decades of benchtop instrument experience with proprietary SiFi signal fidelity technology. Keysight is the professional standard but costs significantly more. For hobbyist budgets, Siglent and Rigol deliver the best balance of reliability, performance, and price.
What’s the difference between a signal generator and a function generator?
A function generator produces standard waveforms (sine, square, triangle, ramp, pulse) for general circuit testing. A signal generator is a broader category that includes function generators plus specialized types like RF signal generators, arbitrary waveform generators, and vector signal generators. Most modern function generators also offer arbitrary waveform capability, blurring the line between the two terms. For most electronics work, a function generator covers your needs.
What is the best hobbyist signal generator?
For hobbyists on a budget, the Koolertron 15MHz at under $115 covers most Arduino, ESP32, and basic audio projects. For more headroom, the SEESII 80MHz DDS offers dual-channel output with Bluetooth app control and 275MSa/s sample rate. If you want proven reliability and better documentation, the Siglent SDG2042X is the best premium choice. Match the generator to your project requirements rather than buying the most expensive unit.
What are the limitations of using a function generator?
Function generators have several limitations to consider. Bandwidth ratings usually apply only to sine waves, with square waves and pulses having lower usable frequencies. The output impedance is typically 50 ohms, which may not match your circuit. Most budget units have limited arbitrary waveform memory, restricting complex custom signals. DDS-based designs can introduce jitter and phase noise that affect precision measurements. For RF work above 100MHz, you need a dedicated RF signal generator.
Are function generator and oscilloscope the same?
No, function generators and oscilloscopes serve different purposes. A function generator creates electrical waveforms that you inject into circuits for testing. An oscilloscope displays and measures electrical signals from circuits. They work together in a typical test setup: the generator provides a known input signal, and the oscilloscope measures the circuit’s response. Most electronics labs need both instruments, though budget constraints often mean starting with one or the other.
Do function generators come with test leads?
Most function generators include one or two basic BNC cables, but rarely include test probes or alligator clips. You will need to buy BNC-to-minigrabber cables or BNC-to-banana adapters separately for most probing work. Quality BNC cables cost $10-20 each, and a good set of minigrabbers runs $15-30. Budget an extra $50-100 for cables and probes when purchasing a generator. The included cables are often low quality and may fail within months.
Final Verdict: Which Function Generator Should You Buy?
After testing all eight units across real projects, our recommendation depends on your budget and use case. For hobbyists and EE students just starting out, the Koolertron 15MHz delivers reliable performance at under $115 and covers Arduino, ESP32, and basic audio projects without compromise. If you want more headroom and dual-channel flexibility, the SEESII 80MHz DDS offers exceptional value with Bluetooth app control and 275MSa/s sample rate that punches above its price class.
For professional work where signal accuracy and build quality matter, the Siglent SDG2042X remains our top pick with TrueArb technology, 16-bit resolution, and touch screen interface that justifies the premium price. The Rigol DG1022Z is the alternative if you prefer Rigol’s SiFi technology and proven track record in lab environments.
Whichever unit you choose, budget for quality BNC cables and minigrabber probes. The included accessories are usually inadequate for daily bench work. For Bode plot automation, pair your generator with an oscilloscope that supports USB connectivity and use SCPI commands to script frequency sweeps. Our team has used this setup for filter characterization, amplifier frequency response testing, and impedance measurements across hundreds of projects, and it works reliably with any of the generators on this list.