Hast Test Chamber – QT-HAST series

HAST Chamber, Accelerated testing is an approach for obtaining more information from a given test time than would normally be possible. It does this by using a test environment that is more severe than that experienced during normal equipment use. Highly Accelerated Stress Testing (HAST) is one method of accelerated testing.

Highly Accelerated Stress Testing (HAST) was developed by Nihal Sinnadurai while working as a Research Engineer at British Telecommunications Research Laboratories in 1968 in order to perform highly accelerated reliability testing of electronics components that are likely to encounter humid environments during normal (ambient) operation. The test is sometimes referred to as the Pressure Cooker Test (PCT).

HAST chamber has gained in popularity as it can deliver results in typically 100 test hours. Temperature Humidity Bias (THB) is a similar humidity and temperature testing process. THB is used to accelerate corrosion activities in metal and typically requires a test time of 1000 hours.

Within the discipline of Reliability, HAST Chambers can be used to reduce the time required to complete humidity and temperature testing of semiconductor and other electronic devices. Critical Assumption – The same failure mechanisms will be

present at the higher stress levels and will act in the same manner as at normal stress levels.

If you want to add water to the machine, all you have to do is open the front drawer and unscrew the lid of the water tank. The water tank has a capacity of 10 liters. If it's just a normal test, the tank's water can be used continuously for about 1 to 2 weeks, It depends on the humidity control and requirements for your test.

The above test graph are test room's temperature humidity control range for QT-HAST220D395 model and QT-HAST380D395 model highly accelerated stress test chambers Choose the wet and dry bulb temperature control method, The humidity control range is 75% ~ 98%. Please make sure you will use the pure water/ purified water for highly accelerated stress test.

The 0.45 MPa highly accelerated stress test chambers will comply with the requirement of the European Community Directives. There has the CE mark stick on the side corner of the highly accelerated stress test chambers during shipment.

Equipment Features

The test room of the HAST chamber is equipped with 2 different styles of racks: Two layers structure of 304 stainless steel shelf and gray support with anti-conductive and insulating, properties, Because customer's products need to be tested in an insulated state.

There are 28 pieces signal terminals inside of the hast test chamber. Taking into account the actual needs of different customers for the electrical conductivity test of the test object, On the right side of the test area, you can also add another 14 pieces signal terminals.

The position of the control panel has USB interface, Ethernet interface, RS232, RS485 interface. Ensure that the machine can successfully connect with the computer. Through the data cable, upload the actual testing data to the engineer's computer, Improve work efficiency.

42 pieces signal terminals ports on control panel of HAST test chamber. In other words, the machine can support the successful connection of up to 42 signal terminals, Provide maximum convenience for test engineer's conductivity test.

The machine is equipped with a 10 liters pure water storage container. After testing, fill 10 liters of pure water at a time, Hast chamber can be operated continuously for 2 to 4 weeks, This depends on the real requirements for humidity during the test.

The 0.45 MPa pressure highly accelerated stress test chamber is equipped with a 7-inches large color touch screen design. The touch screen supports Ethernet communication port, RS 232 interface & USB data export function.

Unsaturation Control | Humid Water Temp Control

• During temperature heat-up when condensation can easily occur on the reverse side of the specimen, the temperature of the humidifying water automatically increases while keeping it at +30°C lower than the test room's temperature.
• After testing is complete, the test room of highly accelerated stress test chamber is left to cool and depressurize naturally until test room's pressure reaches 0.010 MPa. Then both air and water are discharged

Humidity Saturation and Temperature Control

• Test room's temperature is controlled through a humidifying heater. Test room's temperature = humidifying water temperature.
• After testing is complete, The test room is left to cool and depressurize naturally until chamber pressure reaches 0.01 MPa.
• Then only air is discharged, Humidifying water is retained

The Dry Bulb and Wet Bulb Temperature Control

• The temperature and humidity gradient before and after testing can be controlled.
• After HAST testing is finished and room's pressure reaches 0.01 MPa, only air is discharged. Humidifying water is retained.
• In the hold procedure, temp and humidity inside the test room are maintained at the +50°C to +95°C / 75% to 95% RH

Advantages