The high and low temperature alternating humidity test chamber is a very important and critical testing content in environmental reliability testing. It mainly simulates the temperature environment to conduct tests on products such as low-temperature operation, low-temperature storage, high-temperature operation, high-temperature storage, low-temperature start-up, and high-temperature start-up, in order to test the performance of products under temperature conditions.

1、 The purpose of testing products with high and low temperature alternating humidity test chamber

1. Evaluating product performance: Through high and low temperature tests, the performance of the product in temperature environments can be evaluated, including heat resistance, cold resistance, and stability.

2. Predicting product lifespan: In an environment with constantly changing temperatures, products may accelerate aging and shorten their service life. High and low temperature tests can predict the lifespan of products in such environments.

3. Detecting product defects: At temperature, the product may expose some defects that are not easily detectable under normal conditions. High and low temperature tests can help detect these defects in a timely manner for improvement.

2、 Testing items for products in high and low temperature alternating humidity test chamber

Low temperature operation, low temperature storage, high temperature operation, high temperature storage, low temperature start-up, high temperature start-up test.

3、 The working state of the tested product in the high and low temperature alternating humidity test chamber

For electronic and electrical products, it is necessary to demonstrate the typical actual working state of the product during high and low temperature testing.

For example, the switch: when connected to an external laptop, it should be able to ping with the sample without packet loss;

Display screen: The screen of the test sample should be able to display relevant text, date, weather and other information;

Firewall: After the test sample is powered on, it should be able to enter the corresponding operating system;

Current and voltage meter: The test sample should be able to display the corresponding voltage and current values;

The above contents are the actual working conditions that the tested product should be able to perform during or after the experiment. The high and low temperature environmental test mainly assesses the environmental adaptability of the tested product under high and low temperature conditions, so the working state of the tested product is particularly important.

The vast majority of high and low temperature environmental testing results require evaluating the functionality and performance of the tested product.

Of course, there are also some non electronic and electrical products that do not require power on. In this case, how to evaluate the test results of high and low temperature environmental tests?

For plastic parts, there are no cracks, bubbles, or deformations on their surface.

The surface of the tested product has no defects such as damage or deformation. If the surface is coated, there should be no peeling, bubbling, or discoloration of the coating.

Rubber products have no signs of aging, bonding, softening, or cracking.

4、 When does the high and low temperature alternating humidity test chamber need to check the working status of the tested product?

This is mainly determined based on the testing items:

For example, when performing high and low temperature work, the tested product needs to be continuously powered on during the high and low temperature testing period;

Conduct high and low temperature storage tests. During the high and low temperature tests, the tested product does not need to be powered on. After the high and low temperature tests are completed, power on and run to see if the working status changes;

Perform high and low temperature start-up tests. During the stable period of high and low temperature, there is no need to power on the product. It is necessary to start at high and low temperature points and then power on the product to see if the working state of the product changes.

5、 Do I need to bring relevant auxiliary instruments and equipment for the operation of the tested product during high and low temperature environmental testing?

1. For simple independent electronic and electrical equipment, it can work normally without any auxiliary equipment, such as a display screen.

2. When some test products cannot work on their own and need to be connected to corresponding auxiliary instruments and equipment to work properly, or in other words, to determine whether the product is in good working condition, auxiliary instruments and equipment must be brought, such as specialized testing devices, measuring instruments, etc.

Most laboratories are equipped with commonly used accessories such as DC power supplies, power strips, keyboards, etc., which do not need to be carried.

Selection of high and low temperature alternating humidity test chamber