DROK 4-20mA Generator 2pcs - Adjustable Current and Voltage Signal

In this review the DROK 4-20mA Generator 2pcs is assessed as a practical tool for technicians and hobbyists who need an inexpensive way to simulate analog signals for PLCs, panels and LED testing. The single biggest reason to buy is its dual-function design: each compact module produces both 0/4-20mA current and 0-10V voltage outputs from one device, making it a small but versatile bench companion for troubleshooting and calibration tasks.

Key Features

• Dual signal output: Generates both current and voltage outputs from one module so a single unit can simulate transmitter signals without swapping devices.
• Precise adjustment: A multi-cycle potentiometer provides fine tuning of the 4-20mA and 0-10V range for repeatable calibration during PLC and panel setup.
• Clear LED display: The bright 3-digit LED monitor shows output values and is switched with a simple button for quick verification of set points.
• Display calibration: Separate calibration potentiometers on the back let the user correct the current and voltage display if the readout needs trimming for improved accuracy.
• PWM and frequency features: Includes PWM output with adjustable frequency and duty cycle via buttons and an LCD readout to support tests that require pulse modulation.

Who It's For

The DROK 4-20mA Generator is aimed at PLC technicians, automation engineers and electronics hobbyists who need a compact signal source for valve adjustment, inverter control, panel debugging and LED testing. It is particularly useful when a quick simulated transmitter output is needed without setting up larger bench equipment.

Those who require a fully self-contained instrument with internal power or rugged industrial housing should look elsewhere; this kit expects an external power source and has a mix of customer feedback on build quality, so environments with heavy vibration or harsh conditions may need a more robust calibrated simulator.

Pros & Cons

Pros

• Generates both 0/4-20mA and 0-10V outputs from one module, reducing the need for multiple instruments.
• Bright 3-digit LED display and simple switch make monitoring output values straightforward.
• Calibration potentiometers allow the display to be adjusted for better reading accuracy.
• Includes PWM output with adjustable frequency and duty cycle for pulse testing.

Cons

• Requires an external power supply, which some users find inconvenient compared with self-powered units.
• Build quality feedback is mixed, so careful handling is advised in demanding field conditions.

Specifications

Function	0/4-20mA current and 0-10V voltage generator
Display	3-digit LED digital display (switchable)
Adjustment	Multi-cycle potentiometer for precise output control
Calibration	Current and voltage display calibrating potentiometers on back
Extra outputs	PWM output with adjustable frequency and duty cycle
Included	Two modules (2pcs) in kit, with case

Our Verdict

The DROK 4-20mA Generator 2pcs is a cost-effective, flexible signal simulator for technicians and hobbyists who need quick, repeatable analog outputs for PLC and panel work. Its dual amp and volt capability, visible display and calibration options deliver practical value for bench testing, though users should plan for an external power source and handle the units with reasonable care.

Frequently Asked Questions

Can one module output both current and voltage simultaneously?
The module is designed to provide selectable 0/4-20mA or 0-10V outputs via the control; it supports both signal types but typical use selects one output mode at a time.

Is a power supply included?
No, the kit requires an external power source; customers have noted the need to provide appropriate power when deploying the modules.

Can the display be recalibrated if it reads slightly off?
Yes, there are calibration potentiometers on the back of each module to trim the current and voltage display readings for improved accuracy.