Thin wire resistance characteristic measuring instrument - uses four branch bridge circuit with balance indicator and wattmeter to determine wire resistance temp. coefft.

摘要

The electrical measuring bridge contains two extra branches which form two resistors (10, 11) connected in series between them. The ratio of the resistance of the first branch to the resistance of the second branch is equal to the ratio of the resistance of the third branch to the resistance of the fourth branch at the zero position of the device, for reading off the temperature coefft. of the resistor. The equilibrium indicator is connected between the common point of the extra branches and that of the third and fourth branch. The current winding (13) of the watt-meter is connected in parallel with the extra branches and the voltage winding (14) is connected between the common point of the second and third branch.