Comemso Electronics Launches Mobile Test System for EV Charging Infrastructure

Comemso Electronics has introduced Easy Chester Ultimate, a mobile test system designed to evaluate EV charging infrastructure by combining functional testing, charging communication analysis and electrical safety checks in one portable unit.

What Happened

The company says the system consolidates tasks that previously required several separate instruments with different operating concepts and documentation processes. The 15.7 kg unit features a 10.1-inch touchscreen that guides users through each test, recording measurements, communication sequences and results in configurable PDF reports. Easy Chester Ultimate tests AC, DC CCS and CHAdeMO stations across three levels: functional operation, charging communication and electrical safety. On the communication side it checks Control Pilot and Proximity Pilot signaling, PLC communication including SLAC, and analyzes digital charging communication under DIN 70121, ISO 15118-2 and ISO 15118-3. The system can also simulate faults on CP, PP and PE lines and verify how a station responds to insulation faults. Electrical safety testing covers protective conductor resistance, insulation resistance, residual voltage, residual current devices, insulation monitoring and loop impedance measurements.

Why It Matters

The system supports AC Type 1 and Type 2, CCS Combo 1 and Combo 2, NACS under SAE J3400 and CHAdeMO depending on configuration. By combining the three testing levels in one device, comemso says users can identify whether a deviation originates from the electrical installation, charging communication, protection functions or general charging behavior. Typical applications include commissioning new charging points, functional checks after maintenance or repair, diagnosing charging and communication problems, verifying electrical protection functions and periodic inspections. The system walks users through four steps: connect to the station and grid, select the charging standard and test, run safety/functional/communication checks, then analyze deviations and export results.

The Bottom Line

Easy Chester Ultimate is built for commissioning, maintenance, repair and periodic inspection directly at charging stations. Optional extensions include a Long Duration Unit for longer charging cycles and analysis of time-dependent faults, as well as external DC loads for testing at higher charging power over extended periods.