Thermistor uses the principle of multimeter detection

The multimeter can be used to detect the quality of the capacitor, as well as to detect the resistor. Since the types of resistors are mostly, different resistors will have a slight difference in detection.

The multimeter's principle of measuring resistance is actually based on Ohm's law. In the multimeter, its voltage is the voltage of the battery; it has several resistance values, including the thermistor we are testing, its adjustable resistance (the multimeter has different gears, its internal resistance is different), and Its fixed resistance. The current is calculated when our test resistance is equal to zero. So we get a formula: I = U / (Rg + R + R + R) U is the voltage of its internal battery, Rg is the resistance of the meter, R is fixed, a fixed value in series with the meter Resistance, R-modulation, zero-varying variable resistance, R-measurement, resistance to be measured. Since the range of magnitudes of the thermistors is different, the fixed resistors used are different, which makes it divided into several files with a multimeter.

When measuring with a multimeter, the resistance reading is actually the current reading, but the current when R = 0: I = U / (Rg + R + R) is marked as R = 0, when there is no current, the resistance is marked as unimpeded Large, I and is a functional relationship, they are not simple proportional relationships. Different resistors are used, and R is different. When R=0, I is different, so zero is adjusted before each measurement.