How to use the ohm range of a multimeter?
The Ohm gear has several gears: * 1 * 10 * 100, etc. Multiply the measured value by the value of the selected gear. If the * 10 gear is selected and the direct reading number of the tested part is 10, then the actual resistance value is 100 ohms.
1, Zero should be set before use.
2, Cannot measure with electricity.
3, Choose the appropriate magnification.
When using an ohmmeter to measure resistance, an appropriate magnification should be selected so that the pointer indicates near the median. It is best not to use the left third of the scale, as the scale density in this part is poor.
4, The measured resistance cannot have parallel branches.
5, When measuring the equivalent resistance of polar components such as electrolytic capacitors and transistors, strict attention should be paid to the polarity of the two pens.
6, It should be noted that when using a multimeter to measure the equivalent resistance of nonlinear components at different magnification ohm levels, the measured resistance values are also different due to the different median resistance and full scale current at each level. In mechanical watches, the smaller the magnification, the smaller the measured resistance value.
The reading of the multimeter
The surface of a multimeter generally has three sets of scales. One set is a linear scale: voltage and current use this set of scales. The maximum value (far right end) of this set of scales is the range of voltage and current, which can be read in equal parts. (Only the AC voltage range of 10V is separate in this group, and the innermost circle is the logarithmic scale - decibel scale.). The outermost circle is the resistance gear, and the reading method is from right to left. The right side is 0, and the left side is infinite. The center resistance value is the internal resistance of the gear. The actual value is equal to the surface reading multiplied by the magnification.
How to use the Ohm gear of a multimeter
1, Choose the appropriate magnification. When measuring resistance with an ohmmeter, an appropriate magnification should be selected so that the pointer indicates near the median. It is best not to use the left third of the scale, as this part has poor density of scales.
2, Zero should be set before use.
3, Cannot measure with electricity.
4, The measured resistance cannot have parallel branches.
5, When measuring the equivalent resistance of polar components such as transistors and electrolytic capacitors, attention must be paid to the polarity of the two pens.
6, When using a multimeter to measure the equivalent resistance of nonlinear components at different magnification ohm levels, the measured resistance values are not the same. This is because the median resistance and full scale current of each gear are different. In mechanical meters, the smaller the magnification, the smaller the measured resistance value.
