Performance measurement
of the LCD thermometer
|
The adjustment of the thermometer does the 0°C setting with VR2 using the ice water. Also, it does the 100°C setting with VR1 using the boiling hot water. The following graph is the indicated value of the thermometer this time which was measured simultaneously with the alcohol thermometer. Basically, the forward voltage of the silicon diode changes in - 2mV/°C but with the kind of the diode, the change of the voltage isn't linear. When comparing with the value of the alcohol thermometer after setting 0°C and 100°C, as for the temperature display by the diode sensor, it displayed the rather low value. In the graph, there seemed not to be a big difference but there was a maximum of 1.5°C difference among from 30°C to 80°C.   |
