comemso
Contact
Product Finder
Applications
Start with the decisionApplications
Vehicle and charging station
EV TestingVehicle, EVCC and charging-release validation.EVSE TestingCharging-station development through field operation.InteroperabilityReal EV and EVSE in one synchronized test record.
Battery, MCS and EMC
BMS TestingCells, sensors, balancing and controlled faults.BMS + EVCC + OBCValidate the interaction of battery, charging controller and on-board charger.MCS TestingCommunication, signals, cooling and megawatt power.EV Charging EMCKeep charging communication observable under EMC stress.
Production, commissioning and calibration
EVSE End-of-LineRepeatable acceptance and unit-level results.Commissioning & Field ServiceCommission, diagnose and verify installed chargers with an EV charger tester.Calibration & MetrologyTraceable energy verification at the charging point.
Products
Start with the decisionProducts & PlatformsProduct Finder
EVCA
EVCA PlatformCommunication, interoperability, high-power, MCS and EMC paths.EVCA ComOnlyFocused charging communication testing.EVCA Multi MobilePortable laboratory and field analysis.EVCA InteropAnalyse interoperability between a real EV and EVSE.EVCA FlexModular high-power testing and controlled faults.EVCA MCSMegawatt charging communication, low-level signals and system testing.
Easy Chester
Easy Chester PlatformEVSE production, commissioning, service and calibration.Easy Chester MicroAC EV charger tester for wallboxesEasy Chester UltimateAC/DC EV charger testerEasy Chester CalimeraAC and DC EVSE calibration systemEasy Chester EOL / EOL HPCEVSE end-of-line production tester
Battery, software and EMC
Battery Cell SimulatorBMS testing from compact bench to high-voltage HiL.SmartCal calibration (accessory)Automated calibration and adjustment of the Battery Cell Simulator.comframeConfiguration, synchronized analysis and automation.EMC LinkOptical charging communication through the chamber boundary.
Software
Start with the decisionSoftware Capabilities
comframe and integration
comframeThe test software for every comemso system.Integration & APIsREST, Python, CI/CD and laboratory orchestration.Protocol & Domain ModulesSelect released domain depth.Capabilities HubConnect the capability model across EV, EVSE and BMS testing.EVCA Capability HubExplore the detailed EV charging capability stack.
Analyse and test
Automated Standards AnalysisMeasured behaviour, normative context and highlighted deviations.Professional SimulationConfigure nominal, boundary and non-conform behaviour.Manipulating GatewayTest a live correction hypothesis between real partners.
Reproduce and automate
Charge PlaybackReproduce the charging partner for the DUT.Charge Cycle AutomationTurn saved configurations into repeatable campaigns.Conformance Test LibrariesVersioned executable standards-based test logic.
Knowledge
Start with the decisionStandards & Knowledge
Standards and test logic
Charging, Safety & EMCCharging behaviour, field safety, editions and test boundaries.Conformance Test LibrariesReleased executable test logic, verdicts and evidence.AFIR for EV ChargingRegulation, responsibility and verifiable evidence.NACS (SAE J3400)Charging communication tests for the North American Charging Standard.UL standards & EVSE field safetyUL requirements and electrical safety checks at installed charge points.
Methods and terminology
Knowledge CenterTechnical explanations, methods and application guidance.GlossaryStable charging and BMS test terminology.EVSE Calibration MethodsCompare controlled real load and reference measurement.Testing a wallboxProcedure, standards, limits and test report for electricians.Battery Cell SimulationCells, balancing, faults, precision and BMS HiL.
Documents and tools
Resources LibraryCurrent brochures, webinars, guides and checklists.BMS testing whitepaperTemperature, environment, simulation and test wiring.EVSE Inspection GuidePractical commissioning and inspection workflow.Charger Uptime CalculatorEstimate downtime and field-service impact.Technical newsletterChoose product updates and events relevant to your tests.
Company
Start with the decisionCompany
Company
About comemsoEngineering purpose, history and operating companies.Development & manufacturingShort paths from development to system testingQuality & CertificationsManagement systems, validation and calibration evidence.Customer ProofNamed stories, endorsements and published configurations.SustainabilityEnvironmental management and measured progress.
People and network
Customer Care TeamDelivery, commissioning, training and support.Sales PartnersRegional commercial and service access.CareersWork on deep e-mobility testing.
Updates and contact
News & EventsProjects, releases, webinars and company updates.Request a technical demoDiscuss your test task with the comemso team.ContactSales, support and locations in one place.

Portable EV and EVSE analyzer

Take your charging lab to the vehicle and the station.

Take EVCA Multi Mobile to the test object: it records a real charging pair or simulates the partner – in the lab, at the vehicle and in the field – instead of shipping vehicles or chargers to a laboratory.1

Used by the charging specialists at umlaut in their EFECT lab in Braunschweig.

Request a 15-minute demo Find your test system
Front view of the EVCA Multi Mobile portable EV and EVSE test system
EVCA Multi MobilePortable charging test platform
One portable architectureMove between laboratory, vehicle, test event and field.
Three test rolesSimulates the EV, simulates the EVSE or analyses the real pair.
Multiple charging familiesAC, CCS and NACS, CHAdeMO or GB/T DC.
One recordSignals, protocol, timing and electrical behaviour stay aligned.
In 30 seconds
What for
Teams who test charging where the vehicle or charger stands – in the lab, at the vehicle and in the field.
What it does
Simulates EV or EVSE or records a real pair; AC, CCS, NACS, CHAdeMO and GB/T, with external power such as a 3 kW laboratory source/load.
Not for
High-power laboratory tests – that is EVCA Flex.

A fault that only occurs at one site stays unsolved until the test equipment gets there.

From a field finding to a repeatable laboratory test.

An EVSE (electric vehicle supply equipment, or charging station) manufacturer purchased Multi Mobile with a 3 kW laboratory source/load after a precharge investigation. About three minutes of human analysis followed the recording; setup, software work and retest took additional time.

Read the customer account

Portable engineering system

Investigate charging behaviour at the vehicle or field site

You investigate charging behaviour where the vehicle, prototype or charging partner is: on site, in the workshop, on the proving ground or at a test event. Keeping the DUT (device under test) in its original setting helps preserve the conditions behind a charging failure.

EVCA Multi Mobile brings the charging interface to the test site. The findings carry over to controlled reproduction and regression tests back in the laboratory.

Product boundary

Multi Mobile serves portable development, analysis and validation. EVCA Flex provides the laboratory path for tests centred on integrated high power, switching and deep electrical fault injection.

EVCA Multi Mobile connected between a real electric vehicle and a public DC charging station
Portable physical-interface testing at the real charging location.

One system. Three test roles.

Simulate the vehicle, simulate the charging station or analyse the real charging pair.

EVCA Multi Mobile positioned for EV simulation, EVSE simulation and gateway analysis

EV simulation

Charging station tests.

Simulates the electric vehicle to test a real EVSE with controlled vehicle behaviour, battery requests and communication.

  • Normal, boundary and non-conform EV behaviour, configurable.
  • Control Pilot (CP), HLC, timing and configured voltage/current values, measured.
  • Project-specific load or bidirectional power hardware joins where energy transfer is required.
  • Reusable simulations, automation and supported EVSE Test Libraries.
Open the EVSE Testing application

EVSE simulation

Electric vehicle tests.

Simulates the charging station to test the real charging inlet, EVCC (vehicle-side charging communication controller), onboard charger and vehicle charging logic.

  • Configurable SECC, signal and protocol behaviour.
  • Messages, timing, limits, authorisation and termination, varied.
  • Project-specific source hardware joins when the vehicle must receive power.
  • Vehicle-side CAN data and EVCC, OBC and battery management system (BMS) reactions, correlated where integrated.
Open the EV Testing application

Passive or manipulating gateway

Real EV and EVSE analysis.

Multi Mobile sits between the charging partners. Their communication, measurements and behaviour appear on one synchronised timeline.

  • Observes the real pair without replacing either implementation.
  • Decode supported CCS communication, including applicable gateway access for TLS/PnC.
  • Modify, delay, suppress or replace selected live information where configured.
  • Records field behaviour for root-cause verification and later reproduction.
Open Interoperability & Charging Analysis

Charging-specific analysis

Showing decoded data is not the same as analysing the charging process.

Multi Mobile analyses the charging process across physical interface, low-level signals, protocol content, timing and available electrical measurements.

EVCA Multi Mobile evidence chain across interface, signals, protocol, electrical values and time
One time base. All relevant charging layers. The first meaningful deviation stays connected to its cause and consequence.

comframe analysis

Decode. Correlate. Evaluate. Highlight. Preserve.

Automated Standards Analysis identifies relevant deviations. Cross-Layer State Monitoring relates messages, signals and electrical state. The resulting records remain usable for supplier alignment, correction verification, Charge Playback and regression.

Engineering resultFindings, not raw data

Physical interface

Regional connector, inlet, CP, Proximity Pilot (PP), PLC (power line communication) or CAN path and auxiliary signals remain part of the measurement.

Protocol behaviour

Retain sender, message content, order, state and configured TLS or certificate context.

Timing

Message delays, state transitions and the physical reaction share one timeline.

Electrical response

Configured voltage, current and external measurement channels line up with the communication sequence.

Standards-aware evaluation

comframe compares the recorded behaviour with expected limits. Highlight relevant deviations and save the analysis as a test result.

From field recording to laboratory test

Reproduce a charging event under controlled laboratory conditions.

Engineer analysing the charging session of a real electric vehicle with EVCA Multi Mobile in the laboratory
One device in the laboratory: replay recorded charging sessions and, beyond that, test interoperability and standards conformance with the real vehicle.
EVCA Multi Mobile portable test setup beside an electric vehicle and charging station
Use the same EVCA analysis in changing environments.

From a real charging event to a reusable test case

  1. Connect and capture
  2. Isolate the cause

    comframe aligns every layer, and standards-aware analysis highlights the deviation.

  3. Change one variable

    Modify message content or timing with the Manipulating Gateway or simulation.

  4. Reproduce physically

    Charge Playback recreates recorded behaviour at the charging interface.

  5. Automate regression

    Save the case, vary it and run it repeatedly through Charge Cycle Automation or REST API.

Field recordings become controlled, repeatable laboratory tests.

Shared EVCA analysis, simulation and automation

Configure the test. Do not develop the test environment from scratch.

The comframe analysis, simulation and automation functions of your Multi Mobile configuration are available.

Automated Standards Analysis

comframe relates measurements, state transitions, timing and messages to normative expectations and highlights deviations.

Professional Simulation

Supported message values, timing, optional sequences and deliberately non-conform behaviour are configurable.

Manipulating Gateway

Manipulating Gateway observes and changes selected live communication while both real charging partners stay connected.

Charge Playback

Physically reproduce recorded protocol-level EV or EVSE behaviour so the DUT interacts with a repeatable partner.

Charge Cycle Automation

Sequence configurations and variants for repeatable campaigns, endurance work and regression.
Conformance Test Libraries

Released standards-based test cases run with automated steps, supported verdicts and reports.

REST API and integration

Multi Mobile connects to project automation, external measurement, HIL (hardware-in-the-loop) and CI workflows.

Charging technologies and standards

Configure one portable EVCA system for the charging technologies in your test programme.

Connectors, protocol versions, measurement ranges and Test Libraries are configuration-specific.

PLC-based charging

Type 1, Type 2, Combo or NACS interfaces for EV, EVSE and gateway roles.

CAN-based DC charging

Configured CHAdeMO connector, CAN communication and low-level state access in EV, EVSE or measurement roles.

Chinese DC charging

Address EV and EVSE communication for supported GB/T generations without changing to a separate analysis architecture.

Charging communication under stress

An optional EMC-compatible housing supports configured EV or EVSE test roles while the DUT is exposed to conducted or radiated stress.

Communication, security and conformance have distinct scopes.

Configuration logic

Configure Multi Mobile for your device under test, charging interface and test objective.

  1. 01
    DUT and role

    EV, EVSE, both real partners, charging controller or coordinated subsystem.

  2. 02
    Charging interfaces

    AC, CCS1, CCS2, NACS, CHAdeMO or GB/T DC, including connector arrangement.

  3. 03
    Communication depth

    Low-level signals, PLC or CAN, HLC (high-level communication), timing, TLS, certificates and external CAN data.

  4. 04
    Power context

    Measurement only, customer load, source, bidirectional supply or planned EVCA Flex link.

  5. 05
    Capabilities and results

    Gateway, Professional Simulation, Charge Playback, Test Libraries, automation, REST API and reports.

  6. 06
    Environment and growth

    Laboratory, vehicle, field, test event, EMC chamber, Interop workflow or later Flex expansion.

Find your test system Compare the EVCA platform
Right-side product view of EVCA Multi Mobile showing portable enclosure and charging interfaces
PortableLab, vehicle, field
ConfigurableRole, interface, power
ScalableInterop and Flex paths

Frequently asked questions

EVCA Multi Mobile product questions

What is EVCA Multi Mobile?

EVCA Multi Mobile is the portable system in the comemso EV Charging Analyzer/Simulator platform. It combines configured physical charging interfaces, EV and EVSE simulation, passive or manipulating gateway analysis and comframe analysis, simulation and automation for laboratory, vehicle and field tests.

Can one system test both electric vehicles and charging stations?

Yes. In EV simulation, Multi Mobile acts as the vehicle side to test a real EVSE. In EVSE simulation, it acts as the charging-station side to test a real EV. Exact interfaces, power integration and protocol releases depend on the configured system.

Can EVCA Multi Mobile analyse a real EV and a real EVSE at the same time?

Yes. In passive or manipulating gateway configurations, Multi Mobile is placed between both charging partners and correlates supported signals, protocol messages, timing and electrical measurements on one timeline. Applicable TLS access requires the corresponding gateway, certificate and release configuration.

Which charging technologies can be configured?

Published Multi Mobile configurations cover AC and DC CCS Type 1 and Type 2, NACS, CHAdeMO and GB/T DC.

Does EVCA Multi Mobile support ISO 15118-20?

ISO 15118-20 communication is available in applicable released EVCA configurations. Basic communication support, simulation depth, security functions and conformance Test Library availability are separate scopes and must be confirmed independently.

Does the system include a high-power source or load?

Not by default. Multi Mobile is optimised for portable physical-interface access, simulation and synchronised analysis. Project-specific resistive loads, sources or bidirectional power systems can be integrated. EVCA Flex is the dedicated path when scalable high-power and deep electrical fault testing are primary.

More on this topic

Practical examples and further reading

Customer projects, success stories and technical articles related to this page.

  • Customer projectHybrid EVSE Testing for Laboratory and FieldEVCA Multi Mobile connects on-site EVSE testing with repeatable laboratory tests using a Gustav Klein power source and a shared charging-test workflow.
  • Customer projectEVCA Multi Mobile in the Field, April 2025EVCA Multi Mobile combines AC and DC CCS charging tests with customer resistive-load equipment for mobile EVSE testing. Project report, April 2025.
  • Customer projectPortable CCS EVSE TesterCustom EV Charging Analyzer/Simulator in a compact transport case for mobile EVSE development, CCS communication testing and diagnostics.
  • KnowledgeReproduce EV–EVSE interoperability faultsRecord an EV–EVSE fault on one time base, identify the first deviation and reproduce supported partner behaviour in the lab.
  • Product newsEVCA Multi Mobile Generation 5: Launch 2024EVCA Multi Mobile Generation 5: modular Flex architecture introduced in March 2024, with replaceable modules for repairs and hardware extensions.
  • Product newsEVCA Interface: Operation Made EasyEVCA user interface: user levels, consistent controls and saved test presets for EV and EVSE testing. Interface concept and update plans published in 2022.
Customer experience

EVCA in the EFECT charging laboratory.

“The charging specialists at umlaut use the comemso EV Charging Analyzer in our EFECT lab at the Braunschweig site. Since our collaboration with comemso has been excellent for many years, umlaut has once again upgraded the EFECT with comemso hardware.”

Christian NeidelEFECT-Ladelabor, umlaut – Part of Accenture

EVCA system planning

Configure your portable Multi Mobile system.

Charging interfaces, EV/EVSE simulation or gateway role, software options and external power equipment are specified for your laboratory and field work.

Published project examples: January 2025: connected field and laboratory tests · Generation 5: the March 2024 announcement.The articles document the configuration used in each project at that time.

Find your test systemRequest a 15-minute demo

Technical updates from comemso

Choose your newsletter topics

Receive product and software updates, testing insights and information about comemso events.

Choose my newsletter topics

Choose your topics, then confirm your subscription by email. Unsubscribe at any time.

EVCA system selection and growth

Choose Multi Mobile for laboratory, vehicle and field tests.

Systems compared by the task you need to test.

Controller and communication bench
EVCA ComOnly

Communication development and controller tests for EVCC and SECC (station-side charging communication controller).

Grow toward Multi Mobile or Flex
Portable physical-interface testing

EVCA Multi Mobile

Portable EV/EVSE simulation and gateway analysis.

Current product path
Focused real-pair root cause
EVCA Interop

Records real EV-to-EVSE charging sessions, analyses them on a synchronised timeline, validates behaviour and transfers field findings to laboratory tests.

Use when the real pair is primary
Scalable laboratory and power depth
EVCA Flex

External or integrated source/load architecture, switching, high voltage and deep electrical fault testing.

Upgrade when power risk dominates

System selection at a glance

Selection criterionComOnlyMulti MobileInteropFlex
Primary purposeController communicationPortable lab, vehicle and field testingStructured real-pair investigationModular high-power validation
Physical charging interfaceController or integration interfacePortable regional connectorsDefined by the real-pair setupConfigurable laboratory interfaces
EV and EVSE simulationYes, communication-focusedYes, with portable physical contextCase-dependentYes, scalable
Real EV + EVSE analysisInterface-dependentStrong mobile rolePrimary product roleConfigurable
Power and fault depthCommunication onlyMeasurement and external project hardwareMeasurement and partner interactionLow to high power and deep faults
¹ Scope

Functions, charging standards, interfaces, power ratings and Test Libraries depend on the EVCA system, the software release and your project configuration. Automated standards analysis supports, but does not replace, formal conformance testing. The quotation confirms the scope for your project.

  • The quotation must identify hardware, connectors, software licences, Test Libraries and released scope for each charging interface, protocol and test role.
  • ISO 15118-20 communication, Plug and Charge, TLS gateway access, certificates and conformance Test Libraries require separate release confirmation.