Find reliable analog signal generators that support 4-20 mA current and 0-10 V voltage outputs, ideal for PLC testing and calibration. This guide reviews five capable models, highlighting signal types, battery life, displays, and protection features to help you choose a solution that fits your test bench and field work.
| Product | Brand | Key Capabilities | Sample Output Range | Display |
|---|---|---|---|---|
| Riiai SG003A 4-20mA/0-24V | Riiai Store | Multiple signal types; real-time curve; USB rechargeable | 0-24 mA, 0-24 V, 0-24 mA XMT, 0-9999 Hz | 2.4″ TFT color LCD |
| DROK 4-20mA Generator (Single) | DROK Store | Dual ampere/voltage output; simple potentiometer control | 0/4-20 mA and 0-10 V | LED display on unit |
| Adjustable Signal Generator (B0FPQXDQLV) | Generic/Unbranded | 0-24 mA; ±12 V; short circuit protection | 0-24 mA; 0-12 V | Battery indicator and basic readout |
| SEESII MR9270S+HART | Seesii Store | HART, MODBUS, real-time curve; multiple signal types | 0-24 mA; 0-24 V; XMT; Hz | 2.4″ LCD |
| DROK 4-20mA Generator (2 pcs) | DROK Store | Dual output per unit; LED display | 0-20 mA; 0-10 V | LED display |
Riiai SG003A 4-20mA/0-24V Current Signal Generator
The Riiai SG003A supports diverse signal types, including 4-20 mA current, 0-24 V voltage, and 0-24 mA XMT passive current signals, plus a Hz pulse mode with up to 9999 Hz. A 2.4-inch TFT color screen enables clear night and day operation, with backlit controls for quick adjustments. A built-in 3000 mAh battery provides extended operation, up to about 26 hours, and charging occurs via a micro USB port. This model suits PLC testing workflows that require precise level switching and real-time curve display.
DROK 4-20mA Generator
This DROK unit combines ampere and voltage generation in a single module, delivering 0/4-20 mA current and 0-10 V with simple, precise potentiometer control. It is designed for straightforward calibration tasks and PLC panel LED testing, providing a compact and user-friendly solution for bench work where quick signal changes are required.
Adjustable Signal Generator 4-20mA 0-12V
This model offers a built-in 1500 mAh battery and a 0-12 V adjustable voltage output (default 0-10 V) with an accuracy of about 0.03 V after calibration. The current output covers 0-24 mA with an accuracy of roughly 0.05 mA, and it includes short-circuit protection. A practical choice for portable field testing and calibration tasks where battery-powered operation is essential.
SEESII MR9270S+HART 4-20mA
The Seesii MR9270S+HART is a feature-rich signal generator with coverage for voltage, current, and specialized signals like thermocouples and RTDs. It supports HART communication, MODBUS, paperless recording, and real-time curves, along with programmable output. A larger 2.4-inch LCD and tactile silicone buttons optimize usability for laboratory and on-site calibration tasks, enabling both automatic and manual signal shaping for diverse measurement scenarios.
DROK 4-20mA Generator (Two-Pack)
This two-unit DROK kit doubles your test capacity by providing two separate 4-20 mA/0-10 V modules. Each unit features a dual-output design, a bright LED display, and straightforward calibration access. It is well-suited for simultaneous testing of multiple channels or cross-checking signal paths in complex PLC setups, all while maintaining a compact footprint on the bench.
Buying Guide
When selecting a microwave analog signal generator for PLC testing or calibration, consider these key factors:
- Signal types and ranges: Ensure the device supports 4-20 mA and 0-10 V (or 0-12 V) outputs, plus optional Hz pulses or thermocouple/RTD signals if your applications require it.
- Display and usability: A clear LCD or TFT display, backlit controls, and intuitive buttons speed setup, especially in dim environments or fieldwork.
- Power and portability: Battery life matters for portable jobs; look for units with rechargeable batteries and reasonable runtime to avoid frequent recharges.
- Protection features: Short-circuit protection and output limiting can prevent damage to PLC inputs and sensors during testing.
- Programmability and data logging: Models with real-time curves, historical records, or MODBUS/HART support are beneficial for complex diagnostic tasks.
- Build quality and reliability: Durable construction, stable calibration, and accurate readouts reduce downtime in busy labs or maintenance routines.
- Cost of ownership: Consider the number of outputs, dual-channel capability, and included accessories (cables, adapters) to ensure value over time.
For teams that need portable field testing, prioritize battery life and quick-read displays. For lab environments, models with advanced communication options and long-term data logging may justify higher upfront costs. Cross-check compatibility with your existing PLCs, HART devices, or MODBUS networks to ensure seamless integration.