Calibration method of constant temperature and humidity chamber

 Measure the ambient temperature and humidity in the constant temperature and humidity chamber, mainly check its temperature and humidity deviation, fluctuation, uniformity, etc. Uniformity refers to the temperature and humidity difference of each test point at a certain time in the working space of constant temperature and humidity box in a stable state; Volatility refers to the speed (or amount of change) of the parameters at the center of the workspace with time; Deviation refers to the deviation between the actual measured high and low values and the standard values at each measuring point in the workspace (the above measurement is carried out under the stable state of the equipment).


Under normal circumstances, the temperature uniformity of the constant temperature and humidity chamber is not greater than 2.0℃ under high and low temperatures. The temperature fluctuation of the constant temperature and humidity box is no more than ±0.5℃ at high temperature and no more than ±1.0℃ at low temperature.


Timelike environmental instrument constant temperature and humidity box.


The temperature calibration method of the constant temperature and humidity chamber is as follows: In actual work, you need to select an appropriate method according to the actual situation. The following are the advantages and disadvantages of the three calibration methods:


Calibration under no-load conditions.


The advantage of this method is that the whole working area of the constant temperature and humidity chamber has been calibrated, and there is no need to recalibrate when the sample changes, which can effectively evaluate the applicability of the constant temperature and humidity chamber.


The main disadvantage is that the impact of test samples on the chamber cannot be evaluated.


Calibration under load conditions.


The advantage of this method is that the influence of test samples on the performance of the test chamber can be evaluated more accurately, and the detailed environmental test information of key components or components of test samples can be easily obtained.


The main disadvantage is the need for recalibration when changing test samples.


Real-time measurement during use.


This method not only has the advantages of the methods described in 1 and 2 but also can obtain the comprehensive environmental parameters of test samples in the process of environmental test, which is usually used for product tests with high environmental requirements.


The main disadvantage is that each environmental test requires the use of measuring equipment, test chamber calibration is usually used without load calibration method.

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