The process of measuring resistance with a pointer multimeter:
1. First select the gear (there are ×1, ×10, ×100, ×1K, etc.), then directly contact the two test pens, and adjust the zero-setting resistance (the potentiometer can be rotated) so that the pointer points at the 0 ohm scale. (This step is called "resistance zeroing")
2. Connect the two test leads to the two ends of the resistance to be measured (note that this resistance should not be connected to other circuits), then the resistance of the resistance is the number shown * multiple.
Example: Use ×100 gear, the pointer points to the 20 scale, the result is 20*100=2000 Euro.
Test experience:
1) Due to the nonlinear relationship of the electric resistance scale; its middle section is relatively finely distributed, so the pointer indication value should fall as far as possible to the middle section of the scale, that is, within the 20%-80% radian range from the beginning of the full scale, to make measurements more accurate.
Depending on the resistance error level, a ±5%, ±10% or ±20% error is allowed between the reading and the nominal resistance value, respectively. If it does not match and exceeds the error range, it means that the resistance has changed value.
2) During the test, especially when measuring the resistance with a resistance value of tens of k ohms or more, do not touch the test lead and the conductive part of the resistance. The resistance to be tested is welded from the circuit. Other components affect the test and cause measurement errors. Although the resistance value of the color ring resistor can be determined by the color ring mark, it is best to use a multimeter to measure the actual resistance value when using it.
For the detection of cement resistance, because it is usually a fixed resistance, the method of detecting cement resistance is exactly the same as that of ordinary fixed resistance.
