1. Temperature fluctuation: under the steady state of the test chamber (chamber), the temperature changes with time at any point in the working space. ： Calculation method: under the steady state of the test chamber (chamber), the measured point temperature within 30 minutes of the working space (tested every 2 minutes) is half of the difference between the measured maximum temperature and the minimum temperature. Formula (1): ………………………… .. (1)
： In the formula: ——Temperature fluctuation ℃;
——The measured maximum temperature within 30min of the indicated point, ℃;
——The measured minimum temperature of the indication point within 30min, ℃
2. Temperature uniformity: under the steady state of the test box (chamber), the difference between the temperatures of the test points in the working space at a certain instant. : Calculation method: The test chamber (room) is in a stable state, and the test points of the working space are within 30 minutes (tested every 2 minutes). The arithmetic average value of the difference between the highest temperature and the lowest temperature measured in each test. The calculation formula is as follows: twenty two)
: In the formula:-Temperature fluctuation ℃;
——The measured maximum temperature of each test point in the Jth test, ℃;
——The measured minimum temperature of each test point in the Jth test, ℃
3. Temperature deviation: the test box (chamber) is in a stable state, and each test point of the working space measures the upper and lower deviations of the maximum temperature (Tmax) and the minimum temperature (Tmin) from the nominal temperature (Tn) within the specified time, and the calculation formula is as follows Formula (3), Formula (4):
Upper deviation: ………………………… .. (3)
Lower deviation: ……………………. (4)
4. Relative humidity deviation: under the steady state of the test chamber (room), the actual measured maximum relative humidity (Hmax) and minimum relative humidity (Hmin) and the nominal relative humidity (Hn) of the test points in the working space within the specified time Deviation, the calculation formula is as formula (5), formula (6):
Upper deviation: ……………………. (5)
Lower deviation: ……………………. (6)
5. Air pressure deviation: the test chamber (chamber) is in a stable state, and the working space indicator points actually measure the upper and lower deviations of the highest air pressure (Pmax) and the lowest air pressure (Pmin) from the nominal air pressure value (Pn) within the specified time. (7), formula (8):
Upper deviation: ……………………. (7)
Lower deviation: ……………………. (8)
6. Rate of temperature change: within the specified time interval and specified temperature range of the test box (chamber), the amount of change per unit time when the temperature of the indication point of the working space continuously rises or falls continuously is expressed in ℃ / min.
7. Test equipment volume: the actual volume of the space defined by the inner wall of the test chamber (chamber), expressed in m3.
8. Working space: the part of the test chamber (room) that can keep the specified test conditions within the specified deviation range.
9. Indication point: a point representing the state of the working space of the test chamber (room). Generally, the geometric center of the working space is taken, and other suitable points can be selected according to the specific situation.
10. Stable state of the test chamber (chamber): the state of the test chamber (chamber) indicating the point where the amount of change itself reaches the performance index of the equipment itself.
11. Spectral energy distribution deviation: the test chamber (room) is in a stable state, and the difference between the measured radiation intensity and the nominal radiation intensity of each point of the working space within the specified time accounts for the percentage of the nominal radiation intensity.
12. Radiation intensity deviation
When the test chamber (room) is in a stable state, the difference between the measured radiation intensity and the nominal radiation intensity at each point of the working space within a specified time accounts for the percentage of the nominal radiation intensity.
13. The median value of the environmental parameters of the test chamber (room): the arithmetic mean of the highest and lowest measured values ​​within 30 minutes of each test point of the working space in the stable state of the test chamber (room).
14. The adjusted value of the test chamber (room): the difference between the median value and the nominal value of the working environment parameters of the test chamber (room).
15. Rate of change of air pressure: within the specified time interval and specified pressure range of the test box (chamber), the change in the unit time when the air pressure in the working space (generally refers to the air pressure at the pressure port) continuously rises or falls continuously, in kPa Min said.
16. Temperature recovery time: the time it takes for the test point (chamber) to reach a stable state at a specified temperature and then indicate the temperature of the point from placing the load to the original stable state.
17. Settlement rate of salt spray: the free settling amount of the salt spray in the working space of the test chamber (room) per unit time on the specified area, expressed in ml / h · 80cm2,
18. Test box (room) indicating instrument correction value: the difference between the median value of the working space environment parameter and the test box (room) indicating instrument indication value in the stable state of the test box (room).
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