Systems for Electrical Flash and Hipot Testing

Reliable high-voltage testing for your electrical products—automated, documented, and traceable

Whenever electrical energy is involved, the quality of the insulation determines safety and reliability. Whether in sensors, actuators, power electronics, motors, wiring harnesses, complete assemblies, or solar modules: Flash and Hipot tests are key testing methods for evaluating insulation resistance, dielectric strength, and leakage currents—and thus for meeting standards, customer specifications, and legal requirements. At the same time, expectations regarding cycle times, traceability, and automated documentation are rising. Manual or only partially automated high-voltage tests quickly reach their limits here—both in terms of safety and in terms of reproducibility and efficiency.

Ulrich Rotte Anlagenbau & Fördertechnik GmbH develops custom systems for flash and hipot testing to meet these requirements, enabling 100% testing on an industrial scale. Each system is designed as a tailor-made solution—tailored to the test specimen’s geometry, voltage ranges, standards requirements, test sequences, cycle times, as well as the spatial layout and logistics of your production facility. Flasher and Hipot systems from various manufacturers can be integrated—tailored to your production line, layout, and testing strategy. To achieve this, Rotte combines its expertise in special-purpose machine construction, handling technology, automated contacting, measurement technology, and control technology to create comprehensively designed testing systems.

From the concept phase through design, manufacturing, and assembly all the way to commissioning, Rotte provides comprehensive support for your project. And when new product variants are added, standards are updated, or the testing strategy needs to be expanded, we support you with upgrades, retrofit solutions, and modular expansions for your testing system.
Talk to us—we’ll help you integrate high-voltage testing into your production process safely, reliably, and cost-effectively.

Flash and Hipot Testing Technology for Reliable Insulation Quality

Rotte’s flash and hipot test systems cover the entire process, from test specimen feeding and automated contacting to the evaluation and documentation of measurement results. Depending on the product and standard, tests can be combined using AC or DC high voltage, insulation resistance measurements, leakage current tests, and optional grounding or protective conductor tests.

Test specimens are positioned precisely, contacted, and subjected to test conditions according to a specified test program. Time curves, voltages, currents, and limit violations are recorded and evaluated. Contact concepts precisely tailored to the specific application—ranging from needle arrays and test sockets to quick-change adapters and robot-assisted contacting—ensure that every assembly is connected in a reproducible and electrically safe manner. This results in a tested, documented insulation status that forms the basis for safe field applications.

In photovoltaic module production lines, the system also handles the entire handling process for power and high-voltage testing: The module is automatically conveyed, positioned correctly, and connected to the integrated flasher and Hipot system—either semi-automatically or fully automatically, depending on requirements.

Typical Applications for Flash and Hipot Test Systems

Rotte’s high-voltage testing systems are used wherever electrical safety and insulation quality must be verified, for example in:

Sensors and Actuators for Industrial and Mobility Applications
Drive and Control Technology (Motors, Coils, Windings, Inverters)
Automotive and Commercial Vehicle Technology (Control Units, High-Voltage Components, Electrical Systems)
Energy and Battery Technology (Cells, Modules, Enclosures, and Connection Components)
Photovoltaic and Solar Module Production (Performance Testing and Hipot Testing in an Integrated Line)
Security and Industrial Electronics

Whether it’s safety-critical components with stringent standard requirements or mass-produced products with tight quality tolerances—Rotte ensures reproducible test procedures, clear pass/fail decisions, and a testing strategy tailored to your products.

Your Application, Our Solution – When It Comes to High Voltage, We Ensure Safe Conditions

The flash and hipot testing systems from Ulrich Rotte Anlagenbau & Fördertechnik GmbH combine reliable high-voltage testing technology, proven mechanical engineering, and intelligent automation to create solutions that are precisely tailored to your products and processes. Our customers benefit from custom-designed layouts, clearly defined interfaces with upstream and downstream processes, and system concepts that scale with increasing production volumes or new product variants.

The modular design makes it possible to integrate additional test steps, expanded measurement functions, or new product families into existing systems. At the same time, manual tasks are reduced, workplace safety is enhanced, and manufacturing efficiency is improved.

Flexible system architecture for different test specimens and standards

Flexible system architecture for different test specimens and standards

Since insulation tests are used across a wide range of industries and product categories, Rotte systems are designed to be consistently modular. Whether it’s a compact standalone test station, an integrated test station within an assembly line, or a fully automated end-of-line test system, the architecture and feature set are tailored to your requirements.

Possible functional modules include, for example:

Feeding and positioning units for loose parts, trays, or workpiece carriers
Semi-automatic or fully automatic contact placement using grippers, adapters, a needle bed, or robotics
High-Voltage Units with Variable Voltage Ranges and Test Profiles
Integrated measurement modules for insulation resistance, leakage currents, and, optionally, protective conductor resistance
Additional optical or electrical tests (e.g., presence, coding, functional check)

For solar module production, tunnel or tower solutions can also be implemented: In tunnel designs, the module is aligned for testing, secured, and swiveled vertically upward in front of the flasher tunnel. In tower concepts, the module—which is geometrically inaccessible beneath the vertical tower—is automatically positioned beneath the test tower and connected there using suitable adapters. This allows for a wide variety of line layouts and space constraints to be accommodated without sacrificing end-to-end automation.

Reliable Mechanics and Protection Concepts for High-Voltage Operation

High-voltage testing requires the utmost care with regard to safety and operator protection. Rotte systems are therefore designed with a clearly structured safety concept. This typically includes enclosed test chambers, interlocked doors, safety light curtains, or protective covers with interlocks that reliably prevent access during the test process. The test chamber is not released until the high-voltage condition has been safely de-energized.

The mechanical components—frames, guides, contact mechanisms, and module handling systems—are designed to withstand the specific demands of continuous operation. At the same time, the system remains easy to maintain: easily accessible components, defined maintenance points, and well-thought-out service solutions simplify maintenance work and reduce downtime. Upon request, areas that come into contact with the product can be designed so that they can be used without any problems even in demanding environments (e.g., dust, oil mist, or increased cleanliness requirements).

Automated feeding, inspection, and handling of good and defective parts

A modern system for flash and hipot testing does more than just apply voltage. Upon request, Rotte integrates feeding, handling, and sorting equipment to create a seamless testing process—from loading to sorted unloading.

Typical features include, for example:

Automatic feeding via conveyor belts, workpiece carrier systems, or robotic cells
Location and identification checks (e.g., via barcode, DataMatrix, or RFID) prior to testing
Fully automated test sequences with multiple high-voltage steps and additional measurements
Sorting of good and defective parts, labeling, or transfer to subsequent stations
Buffer sections and bypass solutions to ensure line availability

In PV module production lines, the module is automatically conveyed and positioned; in tunnel solutions, it is swiveled upward into a vertical testing position in front of the flasher tunnel and then returned to the production line. Beneath a vertical tower, the module is automatically aligned and connected without requiring manual intervention by an operator. This enables a continuous, highly automated handling and testing sequence—tailored to the flasher and hipot manufacturer of your choice.

Intelligent Control, Analysis, and Traceability

Rotte’s flash and hipot test systems are operated using high-performance control and visualization technology. All relevant test parameters—voltage waveforms, test times, measured values, limit violations, and error codes—are recorded and stored in a structured format. Through an intuitive user interface, users can select test programs, adjust parameters, monitor trends, and perform diagnostics.

The automatic processing of test results is an integral part of the concept: Measurement data is evaluated, classified, and transferred to the system control. In solar module production, for example, the performance class can be automatically determined and transmitted to the sorter control system—either as a visual signal or digitally via an interface. This ensures that downstream sorting and stacking systems always know how to handle the module and which product class it belongs to.

Through optional integration with higher-level MES, ERP, or quality management systems, test results can be linked to serial numbers, lots, and order data. This ensures complete traceability, which supports both internal quality requirements and external documentation obligations. When combined with other Rotte solutions—such as automated can contact formation or assembly and measurement systems—the flash and hipot test systems integrate seamlessly into a continuously monitored and documented manufacturing process.

Your Partner for Customized Hipot Testing

Every product, every standard, and every industry has its own testing strategies and threshold values. That is why Ulrich Rotte Anlagenbau & Fördertechnik GmbH does not develop standard test stations, but rather solutions—including Hipot testers—that are tailored to your specific requirements. Working closely with you, we analyze test specimens, standards, cycle time requirements, and layout conditions, and use this information to develop a technical concept that integrates seamlessly into your production process—including the integration of your preferred flasher and Hipot manufacturers as well as the appropriate conveyor technology.

From engineering through mechanical and electrical assembly to commissioning, employee training, and after-sales support, our team is here to assist you. A structured service and maintenance program ensures that your testing system operates reliably, in compliance with standards, and with process reliability over the long term.

Rotte’s flash and hipot testing systems thus lay the foundation for verifiable electrical safety, high product quality, and manufacturing that meets the growing demands of modern, electrified industrial products and solar module applications.

Contact us—we’d be happy to advise you on high-performance flash and Hipot test systems, integrated module-handling solutions, and how to incorporate them into your new or existing production and testing concepts.

One Company, Many Advantages

Ulrich Rotte Anlagenbau & Fördertechnik GmbH is your specialist in custom machinery. In addition to our innovative solutions in special-purpose machinery and automation technology, you also benefit from a wide range of customer and after-sales services:

Your Advantages at a Glance:

Decades of experience in special-purpose machinery
Extensive know-how across all areas of automation technology
High expertise in the latest technologies and applications for Industry 4.0
All services from a single source—from development and design to manufacturing, assembly, commissioning, and regular on-site maintenance
Optional training of your machine operators, technicians, and supervisors at your facility
Mechanical engineering made in Germany – we design and manufacture exclusively in Germany
Personalized customer support – you will always have a qualified contact person available