4-20mA Signal Generator | PLC Calibrator & PWM Pulse 1-150kHz

Adjustable DC Signal Generator – Voltage, Current & PWM Simulator for PLC Testing

Take the guesswork out of industrial calibration and control system testing with this professional-grade Adjustable Signal Generator. Whether you're a technician, engineer, or electronics enthusiast, this compact multi-function tool lets you simulate 4-20mA current loops, DC voltage signals, and PWM pulse outputs — all from a single device with a vivid 2.0-inch TFT color display.

Made in Mainland China.

Key Features

• Multi-Function Output: DC analog voltage (±12V), DC analog current (0–24mA), and PWM pulse square wave — all in one unit
• Wide Output Range: Freely configurable — set 0–20mA, 4–20mA, 0–10V, 0–5V, or custom engineering values to match your system
• PWM Pulse Output: Adjustable frequency from 1–150kHz with 0–100% duty cycle control (5V high level)
• Measurement Capability: Voltage measurement ±50V; Current measurement ±50mA — test as well as simulate
• Short Circuit Protection: Built-in protection on voltage and current outputs for safe operation
• 2.0" TFT Color Screen (320×240): All parameters displayed on one screen; supports Chinese and English interface switching
• Digital Encoder Knob: Large tactile knob for precise, intuitive adjustment
• 3 Flexible Power Options: External 24V DC terminal / USB Type-C / Rechargeable Li-Ion battery (battery not included)
• Durable ABS Housing: Tough, lightweight build designed for workshop and field use

Full Specifications

What's in the Box

• 1× Signal Generator
• 1× USB Cable
• 4× Clips
• 1× Screwdriver
• 1× User Manual

Important Note

The PWM output of this device operates at a 5V high level. It is not suitable for use in 12V or 2V systems, as 5V is interpreted as a low level in those systems. Please verify your system's logic levels before use.

Ideal For

• PLC (Programmable Logic Controller) testing and commissioning
• Control panel signal calibration
• 4-20mA current loop simulation
• Sensor and transducer testing
• LED driver and PWM frequency testing
• Industrial automation troubleshooting
• Lab bench and field service applications

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External Resource

For guidance on electrical safety standards in instrumentation, refer to OSHA's Electrical Safety Guidelines.

Frequently Asked Questions

Q: What output types does this signal generator support?

A: This multi-function signal generator supports three output types: DC analog voltage (±12V), DC analog current (0–24mA), and PWM pulse square wave (1–150kHz, 0–100% duty cycle). Users can freely configure output ranges such as 0–20mA, 4–20mA, 0–10V, and 0–5V.

Q: Can this device be used for 4-20mA PLC calibration?

A: Yes. This device is specifically designed for 4-20mA current loop simulation and calibration of PLC controllers, panel instruments, and industrial automation systems. Simply connect the output terminals and dial in your desired current value using the digital encoder knob.

Q: What power sources are compatible with this signal generator?

A: The device supports three power supply methods: an external 24V DC terminal input, a USB Type-C connection, or an internal rechargeable lithium-ion battery (battery not included and must be purchased separately).

Q: Is the PWM output compatible with 12V systems?

A: No. The PWM output operates at a 5V high logic level. It is not suitable for 12V or 2V systems because in those systems, 5V is treated as a low-level signal. Please confirm your system's logic voltage requirements before use.

Q: Does the device measure signals as well as generate them?

A: Yes. In addition to generating signals, this device can measure DC voltage up to ±50V and current up to ±50mA, making it a versatile tool for both signal simulation and field measurement tasks.