Multistep metering circuit for industrial transducers - has switchable transducer groups and bridge compensation units and changeover switch between metering points

摘要

The multi-step measuring device is based on a bridge circuit whose diagonal (ab) is fed from a pulse source (1). The measuring transducers are arranged into two groups. Both groups of transducers are switched alternately via a selector switch (7) and compensating units (8-10) (9, 11). These compensate for the contact and circuit resistances. The measuring point (c) of the measuring diagonal (cd) is formed by the junction of the two additional compensating units (10, 11). A changeover switch can be inserted between metering points in the bridge if switching from bridge halves to individual transducers is required. One group of switch contacts is switched via a compensation unit to the same arm of the bridge containing the transducers.