Talk about high and low temperature test chamber temperature deviation index
First, the cause:
The calibration of the test equipment, some technical indicators, the national standards of each version are not uniform, which causes some trouble. For example, the temperature deviation index, JJF1101-2003 "Environmental Test Equipment Temperature and Humidity Calibration Specification" and GB/T 5170.2-2008 "Electrical and Electronic Products Environmental Test Equipment Inspection Method Temperature Test Equipment", the provisions of these two standards are the difference Land. The macro exhibition below talks about the temperature deviation, and the humidity deviation is the same, so I won't say more:
Second, the definition:
1. JJF1101-2003 "Calibration Specifications for Temperature and Humidity of Environmental Test Equipment":
In the steady state, the environmental test equipment displays the difference between the average value of the temperature and the average value of the measured temperature at the center point of the workspace. (Note: The average temperature of the display here refers to the average display temperature of the temperature control instrument of the device)
2. GB/T 5170.2-2008 "Electrical and electronic products environmental testing equipment inspection method temperature test equipment":
When the test chamber (chamber) is in a stable state, the measurement points of the working space are measured for the upper and lower deviations of the highest temperature and the lowest temperature from the nominal temperature within a predetermined time.
Third, the difference points:
1. JJF1101-2003 "Calibration Specification for Temperature and Humidity of Environmental Test Equipment": The reference point is the average temperature of the measured temperature at the center of the workspace. The object of assessment is the temperature average of the temperature control instrument of the equipment, and the deviation from the reference point is evaluated. Obviously, this has nothing to do with temperature uniformity.
This is similar to the temperature indication error index in GB/T 5170.2-2008, but the reference point is different. The reference point specified in GB/T 5170.2-2008 is the average temperature measurement of all measurement points in the equipment workspace.
2, GB/T 5170.2-2008 "Electrical and electronic products environmental testing equipment inspection method temperature test equipment": the reference point is the nominal temperature (that is, the test temperature you want to do, in general, equivalent to the set value), assessment The object is the measurement point of the workspace (for example, the small device is 9 test points), and the degree of deviation from the reference point is evaluated. It can be seen that this already includes temperature uniformity. If the uniformity is not good, the temperature deviation will definitely not reach.
On the whole, if JJF1101-2003 is implemented, the temperature deviation index is easy to implement because it only evaluates the temperature average of the temperature control instrument of the equipment; in comparison, the implementation of GB/T 5170.2-2008, the implementation of the temperature deviation index is It is more difficult because it has to assess the various measurement points in the workspace.
Fourth, the implementation:
As far as we are concerned, the measurement institutes of various provinces and cities are generally implemented in accordance with JJF1101-2003; while the aerospace military industry is generally implemented in accordance with GB/T 5170.2-2008.
Hongzhan has a research institute specializing in the research and development of environmental test equipment. It has mature loop test development methods and laboratories, and gathers a group of outstanding talents and well-known experts in the industry. The strong R&D team leads the domestic loop test technology. Development direction. At present, the company has high and low temperature test chambers with independent intellectual property rights, high and low temperature wet heat test chambers, rapid temperature change test chambers, thermal shock test chambers, three comprehensive test chambers, high and low temperature low pressure test chambers, solar radiation test chambers. The climatic environment test equipment and customized products such as industrial ovens and walk-in high and low temperature damp heat test chambers and high wind speed rain test chambers are at the leading domestic level and international high standards.
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