In this chapter, we will refer to the temperature test method of the high and low temperature test chamber, which includes: the location and number of test points, test procedures, data processing and test results.
Location and number of test points The temperature test method established in the high and low temperature test chamber standard (Part 1)
The upper, middle, and lower horizontal test planes are defined in the laboratory chamber, referred to as upper, middle, and lower levels. The distance between the upper layer and the top surface of the working room is 1/10 of the height of the working room, the middle layer passes through the geometric center of the working room, and the lower layer is 10 mm above the sample rack of the lowest layer.
The test points are located on three test planes, the center test point is located in the geometric center of the studio, and the distance from the remaining test points to the wall of the studio is 1/10 of the respective side length. Not less than 50mm.
test program
Within the adjustable temperature range of the test chamber, select the highest nominal temperature and the lowest nominal temperature.
Make the test chamber run according to the procedure of low temperature first and then high temperature. The temperature at the center point of the working space reaches the test temperature and is stable for 2 hours. The temperature of all test points is tested once every 30 minutes within 30 minutes, a total of 30 times.
Data processing and test results
Correct the measured temperature data according to the correction value of the test instrument.
Remove suspicious data
For data measured at a constant temperature:
Calculate the average temperature of the 30 measured values ​​per point according to equation (1): T? = 1 / n ∑_ (i = 1) ^ n? Ti .................................... (1)
In the formula:
T? —— average temperature in Celsius (℃);
Ti——the i-th test value, the unit is Celsius (℃);
N——Number of measurements.
Calculate the temperature gradient according to equation (2):? T? _J = T? HT? L …………………………………… (2)
In the formula:
? T? _J——Temperature gradient in degrees Celsius (℃);
T? H——the maximum value of the average temperature, in degrees Celsius (℃);
T? L——The minimum value of the average temperature, the unit is Celsius (℃).
Calculate the temperature fluctuation according to formula (3):? T_b = T_ih-T_iL …………………………………… (3)
In the formula:
? T_b——Temperature fluctuation degree, unit is Celsius (℃);
T_ih——The highest temperature value of the i-th point in the working space, the unit is Celsius (℃);
T_iL——The lowest temperature value of the i-th point in the working space, the unit is Celsius (℃);
Calculate the temperature deviation according to equation (4):? T_i = T? IT? O …………………………………… (4)
In the formula:
? T_i——Temperature deviation in Celsius (℃);
T? O——The average temperature of the center point of the work space, the unit is Celsius (℃);
T? I——The average temperature of other points in the working space, the unit is Celsius (℃).
The difference between the set value of the test box control instrument and the central test value should meet the tolerance requirements in the test box performance items and indicators, and the above calculation results should comply with the provisions therein.
According to actual needs, assess the uncertainty of the measurement results. This article is from a professional manufacturer of high and low temperature test chambers-[Lin Pin] http: // National Free Service Hotline
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