What do the k and m values in the resistance range of a digital multimeter represent
In the resistance mode, K represents K Ω, which is in kiloohms. M represents M Ω, which is megaohms.
The k and m in the resistance range of a digital multimeter should be capitalized K and M. Note that lowercase m and uppercase M are marked here to represent different meanings. If it is lowercase m, it represents milliohms, while uppercase M represents megaohms.
Measure the resistance in the resistance mode. The resistance value varies greatly, ranging from a contact resistance of a few milliohms (m Ω) to an insulation resistance of several billion ohms. Many digital multimeters measure resistance as low as 0.1 ohms, with some measuring values as high as 300 megaohms (300000000 ohms).
The resistance must be measured with the circuit power turned off, otherwise there may be damage to the meter or circuit board. Some digital multimeters provide protection in case of erroneous voltage signal connection in resistance mode. Different models of digital multimeters have different protection capabilities.
When conducting precise measurements of low resistance, the resistance of the measuring wire must be subtracted from the measured value. The resistance of a typical test wire is between 0.2 Ω and 0.5 Ω. If the resistance of the test wire is greater than 1 Ω, the test wire needs to be replaced.
If a digital multimeter provides a DC voltage of less than 0.6V for measuring resistance, it can measure the resistance value isolated by diodes or semiconductors on the circuit board. So that the resistor can be tested without removing it.
