Firstly, the high and low temperature low pressure test chamber is depressurized. After the air pressure drops to the set air pressure value and stabilizes for 30 minutes, the air pressure value of the measuring point and the air pressure value indicated by the equipment are recorded. The recording is performed every 1 minute, and 30 times are recorded in 30 minutes. . According to the recorded data, calculate the low air pressure deviation of the high and low temperature low pressure test chamber according to the following formula: â–³ Pmax = Pmax - Pn â–³ Pmin = Pmin - Pn
Where: ΔPmax---pressure deviation, the unit is kilopascals (kPa);
â–³Pmin---the deviation under pressure, the unit is kilopascals (kPa);
Pmax---the measured maximum pressure in 30min, in kilopascals (kPa);
Pmin---the measured minimum air pressure in 30min, in kilopascals (kPa);
Pn---nominal pressure value in kilopascals (kPa);
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