Best Function Generators Under $200 (2026)
We ranked products under $200 by a value score combining feature completeness (output types, channels, frequency range), measured functionality, and price
The Verdict
- Best Overall: DROK 4-20mA/0-10V Dual Signal Generator (2 pcs) — Best for PLC signal simulation: compact dual current/voltage modules for driving 4–20mA and 0–10V inputs
- Best Value: Adjustable signal generator 4-20mA 0-12V DC for PLC testing — Best budget industrial interface: adjustable 4–20mA and 0–12V outputs tailored for PLC testing and control loops
- Best Premium: Koolertron DDS Signal Generator Counter 60MHz Dual-Channel — Best for higher-frequency dual-channel needs: 60MHz-capable DDS unit with arbitrary-waveform and counter features
This roundup highlights function generators and signal sources under $200 chosen for utility in testing, PLC simulation, and lab work. Selections prioritize measurable output types (voltage, current, DDS), channel count, and overall value as determined by feature set and price
Top Picks
-
1
Best Overall DROK 4-20mA/0-10V Dual Signal Generator (2 pcs)
Best for PLC signal simulation: compact dual current/voltage modules for driving 4–20mA and 0–10V inputs
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
-
2
Best Value Adjustable signal generator 4-20mA 0-12V DC for PLC testing
Best budget industrial interface: adjustable 4–20mA and 0–12V outputs tailored for PLC testing and control loops
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
-
3
Healflux Custom Frequency Generator V2
Best for simple frequency-based relaxation setups: basic frequency generator focused on narrow, low-frequency outputs
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
-
4
Upgraded 15MHz DDS Signal Generator Dual-Channel
Best mid-range lab option: DDS dual-channel generator with arbitrary-waveform support and a built-in frequency meter
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
-
5
Best Premium Koolertron DDS Signal Generator Counter 60MHz Dual-Channel
Best for higher-frequency dual-channel needs: 60MHz-capable DDS unit with arbitrary-waveform and counter features
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
-
6
Riiai 4-20mA / 0-24V Current Signal Generator
Best for flexible industrial outputs: versatile 4–20mA and 0–24V signal module for broader PLC and sensor 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