DT890B Digital Multimeter Measurement Temperature ----- Temperature MEASurement Circuit

DT890B Digital Multimeter Measurement Temperature "Electronic News" 2005 No. 23 has published an article "to increase the temperature measurement function" to digital multi-purpose table, and then issued a question of the article in the 45th of the same year, and proposed an improved method. In fact, the so-called improvement is just the normal use of LM35DE. The former is the intention of adding power, only using the power supply probe to complete the measurement, but as the latter said, this circuit cannot work at all. Don't you really use the external power source? Multiple experiments have been experimentally, and the circuit shown by the drawings will be achieved. The value measured by the comparative value is extremely small. Only a large error occurs when the 9V voltage is below 8V. The production method is as follows: The LM35DE is connected with a two-core shield, and the solder joint is insulated by heat shrink tube, and then plug into an aluminum small electrolytic capacitor in hollowed air. Pottain the hot melt adhesive. On the other end, the three-dimensional plug of φ3.5mm is welded, and the probe is done. The next step in the lower right corner of the multimeter, puts the φ3.5mm socket, and the three lines are connected to their respective positions, and they will become successful. Author: Zhang Wei

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