Temperature & Humidity Chamber for Electronics: IEC 60068 Guide
Author : indeecon com | Published On : 25 Aug 2026
Moisture and temperature are the two stresses that kill electronics quietly. A PCB doesn't usually fail on the bench — it fails eighteen months later in a humid coastal warehouse, or after a few thousand day-night cycles on an outdoor installation. A temperature and humidity chamber lets you find those failures in weeks instead of years, and IEC 60068 is the standard framework that tells you how to run the tests so the results mean something.
We build these chambers for electronics manufacturers, so this guide is practical: which IEC 60068 tests apply to electronics, what conditions to run, and how to make sure the chamber you buy can actually deliver them.
Why electronics need combined temperature and humidity testing
Temperature alone and humidity alone each cause damage, but the combination is what mirrors real life and does the most revealing harm:
- of tracks, pads, and connectors.
- and reduced surface resistance, causing leakage.
- into components and potting.
- during temperature transitions, which shorts and corrodes.
- between closely spaced conductors under bias.
A temperature and humidity chamber reproduces these conditions under control. Our chambers hold −70 °C to +180 °C and 20% to 95% RH with a PLC-based touchscreen controller and graphing, which covers the full spread of IEC 60068 climatic tests for electronics.
The IEC 60068 tests that matter for electronics
IEC 60068 is a family of environmental test methods, not a single test. These are the ones electronics teams use most:
Cold — IEC 60068-2-1
Confirms the product operates and survives at low temperature. Relevant for outdoor, automotive, telecom, and cold-storage electronics. Batteries and displays are common weak points.
Dry heat — IEC 60068-2-2
Elevated temperature exposure to expose material degradation, solder and adhesive weakening, and electrical drift. Semiconductors, plastics, and control devices are typical subjects.
Damp heat, cyclic — IEC 60068-2-30
One of the most important tests for electronics. The chamber cycles temperature up and down at high humidity, deliberately driving condensation and "breathing" of moisture into enclosures. This is where corrosion, insulation failure, and moisture ingress reveal themselves. It's run in a damp heat test chamber.
Damp heat, steady state — IEC 60068-2-78
Sustained high temperature and humidity (for example 40 °C / 93% RH) held constant for long durations to assess long-term moisture effects and surface leakage.
Change of temperature — IEC 60068-2-14
Repeated transitions between hot and cold to stress solder joints, seals, and material interfaces through expansion mismatch. For very rapid transitions, a dedicated thermal shock chamber with sub-10-second transfer is used instead of a standard climatic chamber.
Typical setpoints and durations
Your product specification or customer will define exact conditions, but common electronics profiles include:
| Test | Example condition | Purpose |
|---|---|---|
| Dry heat (2-2) | +70 °C, 16–96 h | Thermal endurance, drift |
| Cold (2-1) | −40 °C, 16–72 h | Low-temp operation/survival |
| Damp heat cyclic (2-30) | 25 °C ↔ 55 °C at 93% RH, 6–24 cycles | Condensation, corrosion, ingress |
| Damp heat steady (2-78) | 40 °C / 93% RH, 96 h–56 days | Long-term humidity effects |
| Temperature change (2-14) | −40 °C ↔ +85 °C, defined dwell | Solder/seal fatigue |
Run the device powered and monitored where the standard allows — many humidity-driven failures only appear under electrical bias.
Tell us your standard, setpoints, and product size and we'll spec a temperature-humidity or damp heat chamber that runs the exact profiles you need. Request a quote or talk to an applications engineer.
How to spec the right chamber for electronics testing
The chamber has to hit your conditions reliably and hold them evenly around the product. Look at:
- — must cover your worst-case setpoints with margin. A chamber that only just reaches 95% RH will struggle to hold it steadily.
- — tight, documented spread across the working volume, so every unit under test sees the same conditions.
- — proper humidification and dehumidification for stable RH, especially in cyclic damp heat where the chamber must actively drive condensation and then recover.
- — to run multi-segment IEC 60068 profiles and produce traceable records for compliance.
- — for powering and monitoring the DUT (cabling, sensors) without breaking the seal.
- — adequate ramp rates for -2-14 change tests; move to a thermal shock chamber for very rapid transitions.
Where this fits in a full electronics test plan
Climatic testing is one axis. A complete reliability programme usually pairs it with corrosion (salt spray or cyclic corrosion), ingress protection (dust and water), and mechanical (vibration/shock). We help electronics manufacturers build out chambers across that plan, and offer rental chambers for one-off qualification campaigns and AMC support to keep chambers in calibration.
Frequently asked questions
Which IEC 60068 test is most important for electronics?
Damp heat cyclic (IEC 60068-2-30) is often the most revealing, because the temperature cycling at high humidity drives condensation and moisture ingress — the mechanisms behind most field failures in electronics. Damp heat steady state (2-78) complements it for long-term effects.
What temperature and humidity range do I need for electronics testing?
It depends on your product's environment, but a chamber covering roughly −40 °C to +85 °C and up to about 95% RH handles the common IEC 60068 climatic profiles. Chambers like ours span −70 °C to +180 °C and 20–95% RH for wider coverage.
Should electronics be powered during humidity testing?
Where the standard permits, yes. Many humidity-driven failures (leakage, electrochemical migration, dendrites) only occur under electrical bias, so powered, monitored testing catches failures that unpowered testing misses. This requires chamber access ports for cabling.
What's the difference between damp heat cyclic and steady state?
Cyclic (2-30) varies temperature at high humidity to force condensation and "breathing", stressing ingress and corrosion. Steady state (2-78) holds constant temperature and humidity for long periods to assess sustained moisture effects and surface leakage.
Do I need a separate thermal shock chamber?
If your temperature-change test requires very rapid transitions (seconds), yes — a dedicated thermal shock chamber transfers samples between hot and cold zones far faster than a single climatic chamber can ramp. For slower change-of-temperature tests (2-14), a good temperature-humidity chamber is sufficient.
