SU121863A1 - Bridge for measuring large resistances - Google Patents

Description

For measuring large resistances (on the order of ohms), it is known to use bridges, one of the arms of which is made in the form of a continuously adjustable resistance, and the other to provide sufficient sensitivity in the form of a large non-wire resistance (on the order of 10-1Oi.

Since non-wired resistances are unstable in time and their accuracy cannot be more than a few percent, in such bridges they resort to monitoring the value of the specified resistance, for which purpose the exact reference resistance is connected to the terminals of the bridge before connecting the measured resistance.

In this case, the measurement is associated with the need for additional calculations.

In order to eliminate this disadvantage and thereby ensure the possibility of accelerating and simplifying the measurement process, it is proposed to use two additional ratio arms, connected to the bridge instead of the arms with the measured and, respectively, reference resistances, to control the nonwire resistance.

The drawing shows a diagram of the proposed bridge for measuring high resistances.

In this bridge, one shoulder is made in the form of a resistance box G, the other shoulder consists of constant resistance and, consistently with it, an included rheostat Gg and the third shoulder is a nonwire resistance Gz.

A switch Я and two additional nlets of deposition r are entered into the bridge circuit, and one of which r is connected instead of a seal with a measured resistance rj. , and another - instead of a shoulder with a reference resistance G. Relationship of resistance values - - Sh.