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Best Function Generators Under $200 (2026)

We selected units under $200 by value score that balance rated reliability, waveform/output coverage (4–20 mA, 0–12 V, DDS/arbitrary), channel count, and user feedback

Top Picks

  1. 1
    DROK 4-20mA/0-10V Dual Signal Generator (2 pcs)

    DROK 4-20mA/0-10V Dual Signal Generator (2 pcs)

    DROK • ★ 3.9/5 • Mid-Range

    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
    Check current price on Amazon →
  2. 2
  3. 3
    Healflux Custom Frequency Generator V2

    Healflux Custom Frequency Generator V2

    Tartpe • ★ 3.5/5 • Mid-Range

    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
    Check current price on Amazon →
  4. 4
    Upgraded 15MHz DDS Signal Generator Dual-Channel

    Upgraded 15MHz DDS Signal Generator Dual-Channel

    Seesii • ★ 3.4/5 • Mid-Range

    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
    Check current price on Amazon →
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    Riiai 4-20mA / 0-24V Current Signal Generator

    Riiai 4-20mA / 0-24V Current Signal Generator

    Riiai • ★ 3.3/5 • Mid-Range

    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
    Check current price on Amazon →

Buying Guide

Match output type to your application

Choose generators offering the specific outputs you need—4–20 mA or 0–10/12 V for PLC and process testing, DDS/arbitrary waveforms for lab and RF work

Consider frequency range and waveform flexibility

Higher MHz ranges and arbitrary-waveform/DDS capability matter for signal fidelity and advanced testing; dual-channel units enable differential and multi-signal scenarios

Check analog current and voltage ranges

For industrial control testing, devices that support 4–20 mA loops and 0–12 V outputs provide direct compatibility with PLC inputs and actuators

Evaluate build quality and controls

Look for clearly labeled controls, stable output calibration, and durable connectors—useful in benchtop and field environments

Weigh features vs. price for value

Budget options under $50 can handle basic signal tasks (PWM, 4–20 mA simulation), while higher-priced sub-(price varies) DDS units add MHz-range and arbitrary-waveform features