Temperature & Humidity Cycling

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Temperature and humidity cycling combines changes in ambient temperature with controlled humidity to evaluate product behaviour under changing climatic conditions. This can be useful for electronics and assemblies where moisture effects interact with material movement, connectors, coatings, sensors or insulation.

What is temperature and humidity cycling?

The DUT is exposed to a defined sequence in which temperature and relative humidity vary over time. Depending on the selected method, the cycle may be intended to create or avoid condensation and may include specific high-humidity, cooling, heating and recovery phases.

Why combined climatic cycling matters

Moisture-sensitive problems are not always visible during a constant humidity exposure. Changes in temperature can drive condensation, expansion/contraction and repeated moisture absorption, producing faults that are closer to real climatic transitions.

Typical issues that can be investigated

Moisture-related leakage or insulation changes
Connector and contact instability
Sensor drift or calibration movement
Condensation-related intermittent faults
Coating, adhesive or seal behaviour
Corrosion susceptibility at exposed interfaces
Electrical changes during wet/dry or hot/cold phases

Suitable products and applications

Sensors and instrumentation
PCB assemblies and controllers
Industrial and outdoor electronics
IoT and communication devices
Automotive/EV electronic modules where the customer profile is supported
Medical and consumer electronics

How MSASPL can structure the evaluation

Confirm whether the requirement is damp heat cyclic, composite temperature/humidity cycling or a customer-defined profile
Review required temperature/humidity levels, cycle timing and condensation intent against chamber capability.
Define DUT operating state and in-cycle measurement points.
Execute the agreed climatic cycle and record environmental/functional observations.
Perform recovery and final inspection/function checks.

Standards and test-plan reference

Depending on the required profile, relevant references may include IEC 60068-2-30:2025 for damp heat, cyclic (12 h + 12 h cycle), or IEC 60068-2-38:2021 for composite temperature/humidity cyclic testing. These methods are not interchangeable; the customer requirement must specify the appropriate test.

Frequently Asked Questions

Is temperature and humidity cycling the same as steady-state humidity testing?

No. Steady-state humidity holds relatively constant conditions, while climatic cycling changes temperature and humidity over time according to a defined sequence.

Will condensation occur during the test?

It depends on the chosen method. Some cyclic damp heat profiles are intended to produce condensation; others may be controlled differently. The required method must be identified before the test.

Which IEC standard is relevant?

IEC 60068-2-30 and IEC 60068-2-38 are common references for different cyclic temperature/humidity methods. The applicable one depends on the product specification and intended test objective.

Can the DUT be powered during the complete cycle?

Not always. Some standards limit when specimens can be energized or measured. The operating state should follow the applicable method and customer requirement.

Should this have a separate website page?

Start with a strong section under the Thermal & Environmental parent page. A dedicated page makes sense if MSASPL receives regular demand and can publish enough unique technical content without duplicating the general humidity page.

EMC, EMI and environmental testing support for reliable, certification-ready electronic products.

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Contact

+91 70584 88896

pranav@msaspl.com

Shop No. 1 & 2, Shivranjan Tower, Above Bhujbal Dairy, Someshwar Wadi, Pashan, Pune 411008

MSASPL provides standards-aligned testing, diagnostics and engineering support. Final certification, statutory approval or accredited compliance certification must be obtained from applicable accredited laboratories or certification bodies.