Question

Why should you disconnect the leads prior to changing scales when measuring current?

why should you disconnect the leads prior to changing scales when measuring current?

Answer 1

Electrical Principles :- Measunement :- Meters :- Thene is a mange of meters used for measuring various electrical quantities. These meters ane often expensive and delicate pieces of equipment, so they should always be handled with cane and used according to the manufactunen's instructions, Metery ane available with two different forms of readout Analogue - Readout on a graduated scale with a pointer - operated by a magnetic field Digital - Readout on a digital screen. An analogue meter meter must be must be positioned positioned a correctly. If placed on. its side or an angle, the pointer could be affected by gravity and give an incorrect reading. When viewing the scale, position yourself dinectly in front of the scale. If viewed from an angle, you will get an incorrect reading - the greater the angle the 'mone in accunate it willbe. This is because the pointer is separated from the graduation scale by a short distance. This is called the panallax effect An analogue meter must be checked for zero before being used. There is usually a zeno set screw adjustment to ensure that the pointer stånts on the zero calibration before measurement is taken Any the you change scales when measuring Mesistance, you must always set the zero again. - Always connect meter with the connect polarity - black to negative and med to positive failure to do this could damage the meter, panticularly on analogue meter,