Best Function Generators (2026 Guide)
We ranked products by aggregated user rating and review volume while ensuring coverage of key features (current/voltage outputs, DDS/arbitrary waveform, channel count) relevant to industrial and lab applications
This guide covers top-rated function and signal generators for tools and industrial use, emphasizing units useful for PLC testing, lab-bench work, and signal simulation. Picks were chosen based on aggregated user ratings and review volume, with attention to feature set (4–20mA, 0–12V/0–10V outputs, DDS/arbitrary waveform, dual-channel) and real-world utility
Top Picks
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1
DROK 4-20mA/0-10V Dual Signal Generator (2 pcs)
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
Adjustable signal generator 4-20mA 0-12V DC for PLC testing
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
A compact frequency generator offering adjustable 0.01 Hz to 20 kHz for Schumann resonance-inspired tones. Aims to enhance relaxation and sleep quality. Customer note: 5.0 rating based on a single review
- adjustable 0.01 Hz–20 kHz
- Schumann resonance concept
- compact personal device
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4
Upgraded 15MHz DDS Signal Generator Dual-Channel
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
Koolertron DDS Signal Generator Counter 60MHz Dual-Channel
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
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
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