A product may pass functional testing under normal laboratory conditions and still develop reliability problems during prolonged environmental exposure.

Temperature and humidity can interact with materials, electrical interfaces, insulation systems, and electronic structures. These effects may accumulate gradually and become visible only after extended exposure.

AConstant Climate Test Chamberprovides a controlled environment for investigating these effects under defined temperature and humidity conditions.

How Temperature and Humidity Affect Products

Understanding the physical mechanism behindenvironmental testingmakes test results more useful.

Moisture and Electronic Components

Water vapor can interact with vulnerable areas of electronic products. Depending on product structure and materials, prolonged humidity exposure may contribute to:

Corrosion

Insulation degradation

Connector reliability problems

Coating deterioration

Changes in electrical characteristics

A controlled humidity environment allows engineers to maintain defined conditions while monitoring product behavior.

Temperature and Material Behavior

Temperature can influence the physical properties of materials and components.

Long-term exposure may affect:

Dimensional stability

Mechanical properties

Adhesive performance

Polymer behavior

Sealing structures

Controlling temperature and humidity together allows engineers to investigate their combined influence.

Constant Climate Testingvs. Temperature Cycling

These two methods address different reliability questions.

Constant Climate Testing

The chamber maintains a defined temperature and humidity condition for a specified period.

The main question is:

How does the product behave after prolonged exposure to a defined environment?

Temperature-Humidity Cycling

Temperature and humidity change according to a predefined profile.

Cycling can introduce repeated environmental transitions and may reveal effects associated with thermal expansion, contraction, moisture migration, or condensation.

Therefore, the test method should be selected according to the expected failure mechanism.

Designing a Meaningful Climate Test

A useful environmental test begins with clearly defined parameters.

Define the Environmental Condition

Temperature and relative humidity should be selected according to the intended application, applicable standards, or engineering objectives.

Define the Exposure Duration

Test duration should reflect the purpose of the evaluation, such as screening, comparison, design verification, or reliability assessment.

Define the Measurement Method

Environmental exposure should be connected to measurable product responses.

A typical process can be:

Environmental condition → exposure → electrical or functional measurement → failure analysis

This provides more information than a simple pass/fail result.

TOMILO Constant Climate Test Chambers in the Test Process

TOMILO environmental test chambers provide the controlled temperature and humidity environment required for this type of investigation.

The chamber can be combined with electrical measurements, functional verification, visual inspection, or post-test analysis depending on the product and test objective.

This makes the chamber part of a broader experimental system rather than an isolated testing device.

Applications in Modern Electronics

Constant climate testing is relevant to products where environmental exposure may affect reliability.

Automotive Electronics

Sensors, electronic control modules, connectors, and electronic assemblies can be evaluated under controlled temperature and humidity conditions.

Batteries and Energy Storage

Environmental exposure can be incorporated into reliability programs for battery-related components and systems.

Electronic Components and Materials

Coatings, insulation structures, electronic assemblies, and other materials can be evaluated for moisture- and temperature-related weaknesses.

Turning Environmental Exposure into Engineering Information

The purpose of climate testing is not simply to expose a product to temperature and humidity.

A more useful approach is to determine:

Which condition causes a change?

How quickly does the change occur?

Which component is affected?

Is the change reversible?

Does repeated exposure accelerate the effect?

A Constant Climate Test Chamber provides the controlled environment needed to investigate these questions systematically and support reliability engineering.