Highly Accelerated Stress Test System (HAST Chamber)


Overview of Equipment

The Highly Accelerated Stress Test Chamber has been primarily developed to conduct bias testing which applies constant voltage and signals. The standard equipment features two control modes: [unsaturated control] and [wet saturated control], while the M-type chamber additionally offers a [wet and dry bulb temperature control] mode.
The M-type chamber conforms to the IEC60068-2-66 standard.

Ease of operation
Interior is expanded for easier loading of a large specimen.
5.7-inch color LCD touch panel
Chambers can be operated from PC and tablet.
Automatic water supply
The amount of water required by the humidifying heater for a test is automatically supplied from the water tank.
10 patterns program setting
Color coding for easy connection
12 specimen signal terminal pins (more available as option)

Please scroll horizontally to look at table below.

Model Temperature, humidity and pressure range Inside/Outside
EHS-212 +105.0 to +142.9℃ / 75 to 100%rh /
0.020 to 0.196MPa(Gauge)
φ294×L318 /
EHS-212MD φ294×L318×2 /
EHS-222 φ394×L426 /
EHS-222MD φ394×L426×2 /
EHS-412 +105.0 to +162.2℃ / 75 to 100%rh /
0.020 to 0.392MPa(Gauge)
φ294×L318 /
EHS-412MD φ294×L318×2 /


Reproduction of near-constant temperature and humidity
testing environment with Air-HAST (option for M/MD type only)

Depending on the specimen, not only water steam but also oxidation and other specimen surface conditions can cause failure.
By leaving air in the test area, the Air-HAST function adds air to the high-temp, highhumidity, and pressurized environment for effective accelerated testing of specimens for which the oxygen in air affects degradation, such as with surface oxidation. (Acceleration may not be seen for some specimen.)

Whisker humidity-resistance evaluation testing (Japanese patent No. 5066143)
Evaluation examples for whisker evaluations of mounting boards are limited. One of the main reasons for this is because the testing time can be as long as 1000 or 3000 hours.
To shorten these testing times, ESPEC conducts lead-free solder whisker evaluation of mounting boards using Air-HAST. The results confirmed accelerated effects with testing at 85°C and 85%rh humidity.

Please scroll horizontally to look at table below.

Accelerated testing examples for whisker evaluation
Temperature cycling test -40°C ↔ +85°C 3000 cycles
High temperature and high humidity test +55°C / +85%rh 3000 hours
+85°C / +85%rh 1000 hours
Air-HAST +110°C / +85%rh 200

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