Mittelstandspresse
09.11.2026
comemso launches Easy Chester Micro: safety, communication and charging tests for AC charging stations in one device
The portable tester also checks ISO 15118-2 communication over PLC. Under AFIR, newly installed and renovated public charging points have had to support it since 8 January 2026.
Ostfildern, 09.11.2026 (PresseBox) - comemso electronics GmbH has launched the Easy Chester Micro. The portable tester combines an installation tester and an adapter box in one 5.4 kg case. Electricians and service teams use it on AC wall boxes and AC charging stations for commissioning, maintenance, periodic inspection and after repairs. The touchscreen guides them through every step and keeps test step, measured value and result visible together. No laptop and no customer vehicle are needed.
Electrical safety alone does not show whether a charging station works. An AC charging station only releases charging once the required vehicle states and, where applicable, authorisation is in place. A meaningful field test therefore has to reproduce these conditions while checking the protective measures of the installation.
Vehicle simulation to IEC 61851-1, SAE J1772 and ISO 15118-2
The Easy Chester Micro simulates the vehicle. To IEC 61851-1 and SAE J1772, it measures the Control Pilot (CP) voltage, the PWM duty cycle and the Proximity Pilot (PP) values. Depending on configuration, it has a Type 1 or a Type 2 AC inlet. The charging-function test confirms charging release when phase voltage appears after the contactors close.
If the charging station supports ISO 15118-2, the Easy Chester Micro sets up this digital communication itself, without an external protocol converter. Charging is authorised via External Identification Means (EIM), such as an RFID card or an app.
From “not charging” to a specific test step
The Easy Chester Micro evaluates electrical safety and charging release as separate test steps. This helps service teams when a customer reports that a station is “not charging”. They can check, step by step, whether the station accepts the vehicle states, whether authorisation is in place and whether voltage reaches the connector. After a repair, the same test settings allow a direct comparison with the earlier result.
Why ISO 15118-2 matters: AFIR
Since 8 January 2026, newly installed or renovated publicly accessible AC and DC charging points in the EU must comply with EN ISO 15118-1 to -5. The legal basis is the Alternative Fuels Infrastructure Regulation (AFIR, Regulation (EU) 2023/1804), whose Annex II was amended by Delegated Regulation (EU) 2025/656. From 1 January 2027, EN ISO 15118-20 follows for newly installed or renovated charging points.
Technically, this means ISO 15118-2 over powerline communication (PLC) to ISO 15118-3, also at public wall boxes. An ISO 15118-2 test with the Easy Chester Micro therefore also checks the PLC chip of the charging station and the PLC link to the vehicle. The test report records the connection setup (SLAC) with its attenuation value and the PLC MAC address of the charging station.
The Easy Chester Micro thus provides part of the evidence. It does not replace a full AFIR conformity assessment. Support for ISO 15118-20 is planned for the first quarter of 2027. TLS-secured charging sessions are currently not supported.
Electrical safety on the grid side and the vehicle side
As an option, the Easy Chester Micro performs electrical safety tests to VDE and IEC on both sides of the charging station. It measures insulation resistance at 250 V to 1,000 V and protective-conductor resistance at 200 mA or 25 A. It tests residual-current devices at 6 mA to 300 mA, for each phase. On the grid side, it also determines the loop impedance. It checks the phase rotation and the residual voltage at the vehicle connector after disconnection.
Fault simulation during charging
Optional fault simulations check whether the charging station stops charging: protective-conductor break, CP short circuit, PP short circuit and PP break. An optional AC insulation fault of 2.5 kΩ from L1, L2 or L3 to PE tests the insulation monitoring of the charging station. The switch-off time is not validated.
“Great test technology doesn’t make a complex job feel complicated. The Easy Chester Micro shows technicians what to connect and what to do next, right on the touchscreen.” Kiriakos Athanasas, CEO, comemso
One test report per charging point
The Easy Chester Micro creates one test report per charging point and exports it as PDF. The report shows PASSED or FAILED and documents each measured value with its test step, with explanations. It also contains the charging communication steps. Voltage and current, the maximum charging power, the PLC MAC address and the safety results complete it. Users can add comments, address fields and their company logo. With a mobile hotspot, the report can be sent by email. The optional maintenance package adds photos and the test location from GPS.
Built for field use
The Easy Chester Micro weighs 5.4 kg in its case and measures 40 × 30 × 17 cm. With the case closed, it is rated IP 66. It runs on USB-C: from a 100 W power supply, a 12 V vehicle adapter or a power bank with more than 100 W output. With the optional maintenance package and a hotspot, it receives firmware updates over the air and remote support.
At a glance
Easy Chester Micro / At a glance
Application / AC wall boxes and AC charging stations: commissioning, maintenance, periodic inspection, after repair
Inlet / AC Type 1 or AC Type 2, depending on configuration
Vehicle simulation / IEC 61851-1, SAE J1772; ISO 15118-2 and -3 (PLC) with EIM if the charging station supports it
Safety tests (optional) / Grid side and vehicle side: insulation resistance, protective-conductor resistance, RCD, loop impedance (grid), phase rotation, residual voltage (vehicle side)
Fault simulation (optional) / PE break, CP short circuit, PP short circuit, PP break; AC insulation fault 2.5 kΩ L1/L2/L3 to PE
Report / One PDF report per charging point, incl. charging communication steps and PLC MAC address
Device / 10.1-inch touchscreen, 5.4 kg, 40 × 30 × 17 cm, IP 66 (closed), USB-C power supply
Not included / DC charging stations, AC load test, TLS-secured communication; ISO 15118-20 planned for Q1 2027
Local regulations define the test scope
The applicable regulations, the protection concept and the manufacturer’s instructions define the test plan and acceptance criteria. Relevant IEC references include IEC 60364-6 and IEC 60364-7-722. German implementations include DIN VDE 0100-600, DIN VDE 0100-722 and DIN VDE 0105-100/A1. In the United States, the locally adopted National Electrical Code (NEC), including Article 625, and local amendments apply. The test must reflect the residual-current protection actually installed, for example an RCD Type B, or an RCD Type A or F combined with an RDC-DD to IEC 62955.
Ansprechpartner
Anita Athanasas
0711 982 98-201
Zuständigkeitsbereich: Chief Commercial Officer
Datei-Anlagen:
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The Easy Chester Micro guides technicians through every test on its touchscreen. It runs on a compact USB-C power bank.
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Functions of the Easy Chester Micro at a glance. Safety tests and fault simulation are optional.
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