Testing Chambers Knowledge

  How does the automation control system of the walk-in high and low temperature chamber work ? 1. Sensor acquisition: Firstly, the system will use a temperature sensor to monitor the temperature inside the test chamber and convert the temperature value into an electrical signal. These sensors can monitor the temperature changes inside the test chamber in real time, ensuring the accuracy of the data.   2. Signal processing: Next, the electrical signal is sent to the controller for processing. The controller calculates the amplitude that needs to be adjusted based on the preset temperature target value and the current temperature value to achieve the set temperature target.   3. Control calculation: The controller will adjust the operating status of the refrigeration unit or heater through PID (Proportional Integral Differential) control algorithm based on the calculation results to achieve accurate temperature control. The PID control algorithm can effective...

  The overall temperature tolerance of the high and low temperature rapid temperature change test chamber is 2 ℃ or 3 ℃ , considering measurement errors. The slow change in temperature and the temperature change in the workspace are determined, but in order to maintain relative humidity within the specified tolerance range, the temperature difference between any two points in the workspace must be kept within a small range.   If the temperature difference exceeds 1 K, the humidity standard does not comply with regulations. To maintain the required humidity, the temperature fluctuation should be maintained at 0.5 ℃ in the short term, and the temperature of the experimental sample should be stable between 3 ℃ .   In high and low temperature tests, sometimes the product frosts, and the root cause is the increase in ambient temperature in the test chamber. Due to the thermal inertia, the surface temperature of the product is lower than the test ambient temperature,...

  The nail penetration test for lithium-ion battery cells refers to testing the safety and protective performance of lithium-ion battery cells by inserting needles or other sharp objects into the battery cell shell. This type of test is one of the important means to evaluate the resistance and protective performance of battery cells to external forces. The following are the relevant contents of the needle puncture test for lithium-ion battery cells:   1. Testing equipment: This test requires the use of professional high-precision needle piercing testing instruments, which have the characteristics of high accuracy, good stability, and strong repeatability. During testing, the appropriate needle diameter should be selected based on the battery cell model, usually 3 mm, 5 mm, etc.    2. Test method: Before testing, the battery cell should be charged to the standard voltage and then placed on the test bench. Adjust the corresponding testing parameters, such as th...