Wiring Method Of Strain Gauge

The wiring method of strain gauges When a strain gauge is used to form a Wheatstone bridge circuit, the method can be divided into 1/4 bridge, half bridge, and full bridge methods according to the purpose of measurement. The wiring methods are shown in Fig. 4, Fig. 5, and Fig. 6. Due to the diversity of strain gauge arrangement, wiring method, and Wheatstone bridge output, please refer to the example of combination method of strain gauge bridge.

1/4 bridge method is a circuit in which one strain gauge in the Wheatstone bridge circuit is connected to the fixed resistors on the other three sides. It can be used for general stress and strain measurement, so it is widely used. However, the influence of the wires in the 1/4 bridge dual-wire connection method shown in Fig. 4-1 is large, and when the temperature changes greatly or the wires are too long, the 3-wire 1/4 bridge connection method shown in Fig. 4-2 must be used. For the 3-wire 1/4 bridge connection method, please refer to the temperature compensation method for wires.

Half-bridge method

It is a circuit in which the strain gauges on both sides of the bridge circuit are connected to the fixed resistors on the other sides. It can be divided into two strain gauges, one is the working strain gauge, the other is the working compensation method of the compensating strain gauge for temperature compensation (Figure 5-1), and two are the double working method of the working strain gauge (Figure 5-2). The dual-working method is used to grade the cable other than the measuring object. Depending on the purpose of measurement, you can choose from the two wiring methods in Figure 5-1 and Figure 5-2. Please refer to the example of the combination method of strain gauge bridge.

Full-bridge method

It is a circuit in which all sides of the bridge circuit are composed of strain gauges (Figure 6). The loop can increase the output of the sensor during fabrication or improve temperature compensation. Moreover, it can also be used to render grades other than measuring objects. Please refer to the sample combination method of strain gauge bridge for details.