The problem of measuring diode forward resistance with multimeter
Regarding the problem of measuring diode forward resistance with a multimeter, the multimeter measures diode forward resistance. What is the reason for the different resistance values measured by different ohmic gears? The internal resistance of the measurement loop is different when different gears are selected for measurement.
The problem of measuring diode forward resistance with multimeter
The multimeter measures the forward resistance of the diode, and the resistance values measured by different ohms are different.
A diode is a nonlinear component. From its volt-ampere characteristic curve, it can be seen that the voltage applied across the diode is not proportional to the current flowing through the component, that is, its volt-ampere characteristic is not a straight line but a curve.
When measuring the diode forward resistance with the ohm gear of the multimeter, although the internal power supply voltages from R×1 to R×1k of the ohm gear are the same, the internal resistance of the measurement loop is different when different gears are selected for measurement.
Therefore, the voltages applied across the components are different, and the result is that the components under test reflect different resistance values.
