High and low temperature test chamber detection and calibration standards are different

GB/T5170.1-2008 "General Rules for Inspection of Environmental Test Equipment for Electrical and Electronic Products" 3.2.5 Temperature fluctuation refers to the change of temperature at any point in the working space with time in the steady state of the high and low temperature test chamber.

GB/T5170.5-2008 "Electrical and electronic products environmental testing equipment inspection method damp heat test equipment" in 8.1.3.2.3 specifies the following formula to calculate the temperature fluctuation: △ Tf = (Tfmax - Tfmin) / 2 where △ Tf It is the temperature fluctuation of the jth point in the working space of the test equipment; Tfmax is the measured maximum temperature value within the 30th point of the working space of the test equipment; Tfmin is the measured minimum temperature value within the 30th point of the working space of the test equipment within 30min. Take the maximum value of ΔTf as the temperature fluctuation of the device.

JJF1101-2003 "Calibration Specifications for Temperature and Humidity of Environmental Test Equipment" 6.3.3 Temperature fluctuation calculation refers to the change of the temperature of the center point of the working space with time under the steady state of the environmental test equipment, that is, the center point is 30 min (every Tested once every 2 minutes), the measured difference between the highest temperature and the lowest temperature is half, with the "±" sign.

It can be seen that the definition of temperature fluctuation is also different. There is a variation of the temperature of any point in the working space with time. There is also a variation of the temperature of the center point of the working space with time. Different conclusions can be drawn according to different standards. .

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