How to Calculate Voltage Measurements on a Pointer Multimeter
Pointer multimeter generally has 4-5 scales, respectively resistance scale, voltage scale, current scale, decibel scale, and there is a special scale for AC 1OV, which is readable at 1OV, voltage scale is divided into AC and DC scales, and part of the table also has AC current scale, and DC voltage scale, such as DC voltage scale (MF-10 type) has 1V2.5V10∨50∨100V250V500V, DC voltage scale has O-5O numbers. 100V250V500V, DC voltage scale has O-5O numbers, when the range switch is set to 50V for direct reading, range switch in 1V when the indicated value multiplied by 0.02 for the actual value, 10V multiplied by 0.2, 100V multiplied by 2, that is, the full scale for 1v, 10V and 100V. when the range switch is set to 2.5V, 250 when the indicated value multiplied by 0.05 and 5 for the actual value. Actual value. When the range switch is set to 500, multiply by 10. The same applies to AC voltage.
When you measure the voltage will choose a different gear to measure, when the meter pointer in a certain value to stabilise and not in the swing when you read out the value multiplied by the multiplier of the gear you use is the actual voltage value measured by the multimeter.
Notes on the use of multimeter
(1)Before using the multimeter, you should first carry out "mechanical zeroing", that is, when there is no measured quantity of electricity, make the multimeter pointer in the position of zero voltage or zero current.
(2) In the process of using the multimeter, you can not use your hand to touch the metal part of the pen, so as to ensure the accuracy of the measurement on the one hand, and ensure personal safety on the other hand.
(3) When measuring a certain amount of electricity, you can't change the gear at the same time of measurement, especially when measuring high voltage or high current. Otherwise, it will destroy the multimeter. If you need to change gears, you should disconnect the meter pen first and change gears before measuring.
(4) When the multimeter is in use, it must be placed horizontally to avoid errors. At the same time, it should also be noted to avoid the influence of external magnetic field on the multimeter.
(5) After the multimeter is used, the changeover switch should be placed in the maximum stop of AC voltage. If it is not used for a long time, the battery inside the multimeter should be taken out to avoid battery corrosion of other devices inside the meter.
