Decoder Tester

Decoder Tester

Details:

The ESU Profi Decoder Tester is a professional-grade diagnostic tool designed for testing digital model railway decoders before installation into locomotives. It provides a controlled and fully featured testing environment, allowing modellers to evaluate decoder performance without the influence of locomotive wiring, motors or lighting circuits.

By connecting the tester to a DCC command station or ESU LokProgrammer, users can safely and efficiently check decoder functionality, motor response, lighting outputs and sound performance. This makes it an essential workshop tool for both hobbyists and professional installers working with ESU LokSound and LokPilot decoders.

The unit is equipped with a wide range of standard decoder interfaces, including 6-pin NEM 651, 8-pin NEM 652, 21MTC, PluX22 and Next18 sockets, ensuring compatibility with virtually all modern decoder types. Decoders without a plug interface can also be connected via individual terminals, providing maximum flexibility for testing.

A built-in coreless motor with flywheel allows accurate evaluation of motor control characteristics such as smooth acceleration, low-speed stability and speed consistency. Directional LEDs provide immediate visual feedback for lighting outputs, while additional indicators display AUX1 through AUX6 function activity.

For sound decoders, the tester includes an integrated 20mm speaker, enabling full audio testing of LokSound decoders. The speaker load can be switched between 16 ohm and 100 ohm settings or disabled entirely, ensuring compatibility across multiple decoder generations.

The ESU Profi Decoder Tester is designed to streamline the decoder installation process by allowing full pre-installation testing. This helps identify faulty decoders early, verify sound projects, and fine-tune motor settings before fitting into a locomotive.

It also includes SUSI interfaces for testing expansion modules and can be connected via screw terminals or solder pads, making it highly adaptable to different workshop setups. Its robust design and comprehensive interface support make it one of the most versatile decoder testing tools available for model railway electronics.

Features:

• Universal decoder testing station for ESU LokSound and LokPilot decoders
• Supports NEM651, NEM652, 21MTC, PluX22 and Next18 interfaces
• Direct terminal connections for non-interface decoders
• Built-in coreless motor with flywheel for realistic load testing
• LED indicators for headlights, tail lights and AUX1–AUX6 outputs
• Integrated 20mm speaker for sound decoder testing with selectable impedance

Additional Information:

• Supported Interfaces: NEM651, NEM652, 21MTC, PluX22, Next18
• Motor: Integrated coreless motor with flywheel
• Audio: Built-in 20mm speaker (switchable impedance 16O / 100O / off)
• Function Testing: LED indicators for lighting and AUX1–AUX6 outputs
• SUSI Support: Yes (dual interfaces)
• Connection: Terminal block or solder pads
• Application: Decoder testing, diagnostics, pre-installation verification

Measurements:

• Length: 99mm
• Width: 74mm
• Height: 34mm