Best Function Generators Under $200 (2026)
We ranked products under $200 by a value score that weights functional specs (output types, frequency range, channels), build quality, and practical test features
The Verdict
- Best Overall: DROK 4-20mA/0-10V Dual Signal Generator (2 pcs) — Best for PLC signal simulation: dual current and voltage outputs for testing 4–20mA and 0–10V loops
- Best Value: Adjustable signal generator 4-20mA 0-12V DC for PLC testing — Best for budget PLC work: adjustable 4–20mA and 0–12V outputs tailored to industrial sensors and controllers
- Best Premium: Koolertron DDS Signal Generator Counter 60MHz Dual-Channel — Best for higher-frequency bench tasks: 60MHz DDS dual-channel unit for broader signal and waveform generation
This roundup highlights function generators and signal sources under $200 that balance features, build quality, and real-world utility for test benches and PLC work. Selections prioritize measurable capabilities—frequency range, output types (voltage, current, DDS), channel count, and overall value score from comparable units
Top Picks
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1
Best Overall DROK 4-20mA/0-10V Dual Signal Generator (2 pcs)
Best for PLC signal simulation: dual current and voltage outputs for testing 4–20mA and 0–10V loops
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 for budget PLC work: adjustable 4–20mA and 0–12V outputs tailored to industrial sensors and controllers
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 for low-frequency relaxation use: targeted frequency generation for Schumann-like and sleep-aid applications
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 for compact lab use: DDS-based dual channel with arbitrary waveform and built-in frequency readout
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 for higher-frequency bench tasks: 60MHz DDS dual-channel unit for broader signal and waveform generation
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 current-loop versatility: 4–20mA and 0–24V outputs designed for flexible industrial simulation
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 unit with larger display and arbitrary waveform capability
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