Best Function Generators (2026 Guide)
We shortlisted models with high aggregated ratings and review volume, then prioritized diverse output types, channel count, frequency range, and utility for industrial and lab testing
The Verdict
- Best Overall: DROK 4-20mA/0-10V Dual Signal Generator (2 pcs) — Best for PLC signal simulation: compact dual 4–20mA and 0–10V outputs for straightforward sensor and input testing
- Best Value: Adjustable signal generator 4-20mA 0-12V DC for PLC testing — Best budget PLC tester: adjustable 4–20mA and 0–12V outputs with simple controls for routine loop and input checks
- Best Premium: Koolertron DDS Signal Generator Counter 60MHz Dual-Channel — Best higher-frequency bench unit: 60MHz DDS dual-channel with arbitrary waveform support for demanding signal work
This roundup compares top-rated function and signal generators useful for lab testing, PLC simulation, frequency work, and relaxation devices. Picks were chosen by aggregated rating and review volume and prioritized for feature variety, output types, and channel/frequency capabilities
Top Picks
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1
Best Overall DROK 4-20mA/0-10V Dual Signal Generator (2 pcs)
Best for PLC signal simulation: compact dual 4–20mA and 0–10V outputs for straightforward sensor and input testing
Dual signal generator module outputs 0/4-20mA current and 0-10V voltage with a clear LED display. Useful for PLC testing and troubleshooting; praised for accuracy and ease of use, though build quality and power sourcing receive mixed feedback
- dual amp & volt output
- bright LED display
- back calibration potentiometers
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2
Best Value Adjustable signal generator 4-20mA 0-12V DC for PLC testing
Best budget PLC tester: adjustable 4–20mA and 0–12V outputs with simple controls for routine loop and input checks
Adjustable signal generator for 4-20mA current and 0-12V DC voltage output. suitable for PLC controller panel testing and LED calibration. customer notes indicate variable output depending on load
- 4-20mA/current and 0-12V DC outputs
- PWM pulse capability up to 150 kHz
- short circuit protection and high precision
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3
Healflux Custom Frequency Generator V2
Best low-frequency wellness tool: focused frequency output tuned for relaxation and Schumann-range use
A frequency generator offering adjustable sine wave resonance, featuring 7.83Hz Schumann resonance for relaxation and sleep support. Easily tunable from low to high frequencies to fit personal needs
- 7.83Hz Schumann resonance
- wide 0.01Hz–20kHz adjustable range
- ultra-low to high frequency capability
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4
Upgraded 15MHz DDS Signal Generator Dual-Channel
Best midrange lab option: DDS dual-channel with arbitrary waveform and 15MHz range for versatile bench tasks
Dual-channel DDS waveform generator with 15 MHz sine output and 200 MSa/s sampling. Stores 99 user states and 60 custom waves for later use. AI note: praised for functionality and readability of display
- 500kS/s? actually 200 MSa/s sampling
- store and recall 99 states
- custom waveform library with 60 saves
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5
Best Premium Koolertron DDS Signal Generator Counter 60MHz Dual-Channel
Best higher-frequency bench unit: 60MHz DDS dual-channel with arbitrary waveform support for demanding signal work
Dual-channel arbitrary waveform generator with 60MHz precision and 275MSa/s sampling. Mobile app control for data import/export and function settings, plus convenient waveform management
- mobile APP control
- 60MHz high precision
- arbitrary waveform data import/export
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6
Riiai 4-20mA / 0-24V Current Signal Generator
Best for extended voltage simulation: supports 4–20mA and up to 0–24V outputs for broader industrial testing scenarios
Riiai signal generator converts 4-20mA to various modes (mA, V, XMT) with adjustable precision. Real-time curve and USB rechargeable, suitable for PLC testing. One customer notes good usability, while another cites accuracy and resistance measurement limits
- multi-signal-type support
- precise 0.01mA/0.01V resolution
- USB rechargeable with presets
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7
Koolertron DDS Signal Generator Counter 2.8in 80MHz Dual-Channel
Best for advanced waveform work: 80MHz DDS dual-channel with larger display and FPGA-driven features for complex testing
Compact dual-channel arbitrary waveform generator with mobile app control and data import/export. AI note: users value features and accuracy, though waveform quality feedback is mixed
- dual-channel high-precision generator
- mobile app control
- firmware-friendly with waveform data import/export