At present, most furnace temperature testers on the market have similar accuracy and error in general temperature measurement, and can basically meet the user's measurement requirements even if the requirements are not high. But this does not mean that most furnace temperature testers are already perfect products. There are still many troubling problems and defects. These problems and defects are mainly caused by the poor design and calibration method of the furnace temperature tester motherboard. There are two core sources of defects and errors in the mainboard of the furnace temperature tester: the mainboard design structure and the mainboard calibration method. Below is a summary of these two aspects.
1. Furnace temperature tester motherboard design structure
Some motherboard design problems are not easily noticed in most temperature measurements, and they cannot be verified in ordinary laboratories. The important thing is the furnace temperature tester Motherboard designers simply cannot take this type of issue into consideration.
At present, most oven temperature testers can be said to have no problems in testing reflow soldering, coating and other fields. However, in wave soldering testing, most oven temperature testers have the problem of low test data. This error has reached the point where it may mislead the production process. The specific temperature error is approximately degrees. In a temperature measurement of less than a degree, this huge temperature error is obviously unacceptable.
Through the understanding and testing of many furnace temperature testers. At present, few companies have effectively solved this problem. Among dozens of furnace temperature testers, some brands from Germany, the United States, and Taiwan have solved this problem.
In the interviews and surveys of furnace temperature tester manufacturers, most manufacturers are aware of the existence of this problem, but there is no solution and some improvements have been made. The improved results have narrowed the error range, but the error Still between degrees.
This shows that the problem is not an explicit problem, but an invisible problem, not a regular problem, but a special problem.
What exactly is this problem and how to solve it? It is an important proposition before everyone
2. Mainboard calibration method of furnace temperature tester
There are two main factory calibration methods of furnace temperature tester, mathematical model calibration and standard voltage calibration.
Mathematical model calibration generally uses a percentage to identify the instrument error range. When calibrating this type of instrument, the peripheral constant temperature environment is used as the calibration standard, and the overall calibration of the furnace temperature tester is achieved by calibrating each channel one by one. The hidden problems of this calibration method are as follows. If the peripheral constant temperature environment is not standard or there is no constant temperature, what problems will occur? , if multiple channels have different data when testing the same temperature, what is the final adopted result? , as the test temperature increases, the absolute temperature error will also increase proportionally. How to deal with it?
Standard voltage calibration generally uses an absolute temperature data to identify the instrument error range. It synchronously calibrates the instrument accuracy based on the thermoelectric effect ratio, achieving the goal of calibrating multiple or all channel data at one time. The most important thing is that the working principle of this calibration equipment and the furnace temperature tester have the same root and are completely consistent.
Colleagues are invited to brainstorm and work together to completely solve various problems in the furnace temperature tester industry, and contribute their sacred power to the improvement and perfection of the furnace temperature tester. Shenzhen Jingkechuang Electronic Equipment Co., Ltd.
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