Agilent Technologies E1356A Dokumentacja Pobierz pdf (Strona 56)

For a full bridge arrangement, strain gages comprise all four arms of the

Wheatstone Bridge (Figure 4-5). Note the position of the bridge selection

jumper required to configure the channel for full bridge measurements.

120Ω and 350Ω

Multiplexers

A 120Ω strain gage multiplexer is distinguished from a 350Ω multiplexer

by the value of the Wheatstone bridge completion resistor shown in Figure

4-3. When strain is measured with a

⁄

bridge arrangement, a 120Ω

strain gage multiplexer is required for 120Ω gages, and a 350Ω

multiplexer is required for 350Ω gages. In the

⁄

and full bridge

arrangements, the bridge completion resistor is replaced by a strain gage

(Figures 4-4, 4-5). Thus, any strain gage multiplexer can be used with

any value of gage resistance when measuring strain with a

⁄

or full

bridge arrangement.

Figure 4-5. Bridge Completion Circuitry - Full Bridge

Figure 4-4. Bridge Completion Circuitry - 1/2 Bridge

Chapter 4 Understanding the Strain Gage Multiplexers 55

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Agilent Technologies E1356A Dokumentacja Strona 56