Common Troubles in Multimeter Resistance Measurement
Common problem one: How to zero when using a multimeter to measure resistance?
When measuring resistance with a multimeter, zeroing the multimeter is essential and requires engineers to pay more attention. The specific zeroing operation can be completed in two steps. The first step can be summarized as mechanical zeroing. We can use a screwdriver to rotate the mechanical zeroing screw to align the pointer with the left zero position. The second step can be called short-circuit zeroing. We will make contact with the metal part of the red and black meter rod, adjust the zeroing knob on the multimeter, and align the pointer with the right ohm zero position. Note that if shifting gears, short-circuit zeroing must be performed again.
FAQ 2: How to choose the range of a multimeter when measuring resistance?
In the process of using a multimeter to measure resistance, we need to choose the appropriate range based on actual needs in order to obtain a highly accurate measurement result. When using a pointer multimeter to measure resistance, we should try to make the pointer point to the middle position of the scale as much as possible. One thing to note is that when measuring the motor coil, the resistance of the motor coil is very small, and it should be set to R × 1 or R × 10; When measuring insulation resistance, the R × 10K gear should be set.
FAQ 3: How to use a digital multimeter to check the resistance value of the resistance wire during measurement?
In the process of using a digital multimeter to measure resistance, we can actually directly measure the resistance of the resistance wire. Firstly, you need to set the digital multimeter to the resistance range, and then use two probes to measure the resistance at both ends of the resistance wire. The value displayed on the electronic screen is the resistance of the resistance wire. If you want to further detect the current value, you need to keep the black probe still and insert the red probe into the 20A hole. Then adjust the gear to DCA20 (DC) or ACA (AC), disconnect any point in the circuit, and connect the two probes in series to measure the working current.
