Vishay 2310 Betriebsanweisung PDF herunterladen (Seite 72)

Figure 19 Crucial Information of Strain Gauge Selected

2.4 Basics of Wheatstone bridge

A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance (from 1 Ω

to 1MΩ) by balancing two legs of a bridge circuit, one leg of which includes the unknown component. A

circuit diagram of Wheatstone bridge is shown in figure below, where the battery (symbol “E” serves as

an excitation source, and the output is measured by a potentiometer “G”).

A “balanced” bridge is one with potential difference between B and D is equal to zero. Balance is sensed

by closing switch S2 and measuring output current and voltage – to be near zero. Voltage drop across R2

is equal to voltage drop across R1, since voltage difference between B and D is equal to zero. Therefore,

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Eq.10

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Vishay 2310 Betriebsanweisung Seite 72