Deflection Method

The method of electrical measurements in which the deflection of the index of the measuring instrument is used as the measure of the current or other element under examination. It is the opposite of and is to be distinguished from the zero or null method, q. v. In the latter conditions are established which make the index point to zero and from the conditions nece ary for this the measurement is deduced. The Wheat stone Bridge, q. v., illustrates a zero method, the sine or the tangent compa , illustrates a deflection method. The use of deflection methods involves calibration, q. v., and the commercial measuring instruments, such as ammeters and volt meters, which are frequently calibrated galvanometers, are also examples of deflection instruments. 179  STANDARD ELECTRICAL DICTIONARY.