Multimeter voltage, current, ohms readings in the end how to read the right?
For a pointer multimeter, the first thing to do is to understand the scales for voltage, current, and resistance measurements. In addition, the multimeter should be placed so that the human eye and the centre of the meter become a plane, so that the error caused by the angle of view can be reduced. Here I take the MF47 series pointer multimeter to say. See the figure below.
● From the dial, the top scale is the scale of the resistance position. At this time, when measuring the resistance value of the resistor, you have to dial the gear knob to the resistance of × 1, × 10, × 100, × 1k, × 10k on a gear.
● Pointer multimeter in the measurement of the use of ohm gear first of all have to be the table calibration zero. The method is to short the red and black pens, with the internal battery of the multimeter and the circuit to form a closed loop, so that the pointer deflected to a position. Because the internal resistance of the battery is changing, so the measurement should be adjusted "resistance zero knob", so that it points to "0" position. When the zero setting does not point to "0", it means that the internal battery is out of power and needs to be replaced with a new one.
● The scale of the ohmmeter is not uniformly distributed, there are small and large cells, how much a small and large cell represents cannot be generally set as a standard, but depends on the selected gear in what place to determine. Such as the gear switch dial in the "R × 1k" block, such as the ohm scale between 10 and 20 divided into 5 large cells, then each large cell represents (20-10) ÷ 5 × 1k = 2kΩ. If 10 and 20 divided into 10 large cells, then each large cell represents (20-10)
If there are 10 large cells between 10 and 20, then each large cell represents (20-10) ÷ 10 × 1k = 1kΩ. If there are 5 large cells and 10 small cells between 50 and 100 on the ohmic scale, and if the switch is in the "R × 10" block, then each large cell represents (100-50) ÷ 5 × 10 = 100Ω, and each small cell represents (100-50) ÷ 10 × 10 = 50Ω. Simply put resistor steps look at the scale and the number of steps for multiplication.
● DC current, DC voltage , AC voltage dial on the second row of the dial. Different scale values mainly for the convenience of reading, in fact, to a scale can be, and then multiplied by the selection multiplier. For example, if we select 250, it means the full scale is 250V.
(If you select the 50 gear full scale is 50V, other gears are the same). See the small diagram above where the needle is pointing at 227 on the dial. The measured voltage is 227V.
In addition, under the scale for a separate line dedicated to measuring AC voltage 10V within the scale. It is used as a special measurement of AC voltage in the 10th gear of the pointer meter to measure the voltage within 10V AC.
