Operating Steps for Measuring Resistance with a Multimeter's Resistance Range
1. Mechanical zeroing: Place the multimeter according to the placement method (MF47 type is horizontally placed) (one placement); Check if the pointer of the multimeter is pointing to the zero mark on the left end (second check); If the pointer does not point to the zero mark on the left end, use a flathead screwdriver to adjust the mechanical zero adjustment screw so that it points to zero (three adjustments).
2. Initial test (trial test): Turn the conversion switch of the multimeter to the ohm x 100 position. Connect the red and black probes to the two pins of the measured resistor for measurement. Observe the indicated position of the pointer.
3. Choose the appropriate magnification: Select the appropriate magnification based on the position indicated by the pointer.
(1) The selection criteria for appropriate magnification: make the pointer indicate near the median. *Do not use the left third of the scale, which is densely packed and has a large reading deviation. Try to point the pointer between the digits 5-50 on the ohm scale as much as possible.
(2) Quick selection method for appropriate magnification: if the reading is too large, increase the magnification; The reading is too small and the magnification decreases.
Note: The indication is either too large or too small relative to the range of numbers 5-50 on the scale. When the pointer points to the right of
5, it is called a reading that is too small; When the pointer points to the left of 50, it is called a reading that is too large.
4. Ohm zeroing: After selecting the magnification, perform Ohm zeroing by short circuiting the two probes and turning the zero ohm adjustment knob so that the pointer points to the "0" Ω on the right side of the resistance scale.
5. Measurement and reading: Connect the red and black probes to both ends of the resistor and read the resistance value.
Reading method: Multiply the reading indicated by the pointer on the meter by the selected multiplier value to obtain the resistance value of the measured resistor. For example, if R × 100 is selected for measurement and the pointer indicates 40, the measured resistance value is: 40 × 100=4000 Ω=4K Ω.
