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Block Diagram

Description

For all strain measurements, the bridge configuration is wired from the

specimen to selected +E, -EI , -E2, H, L, and G terminals on the strain gage

multiplexer terminal module.

When a strain (measurement) command is executed, the bridge completion

channel’s relay or FET switch is closed, as is the multiplexer’s tree relay or

tree switch. This passes the H, L, and G signals from the strain gage to the

multimeter, via the analog bus. The +E, -E1, and -E2 signals are wired

directly to the strain gage measurement circuitry on the terminal module.

The measurement circuitry is covered in the following sections.

Understanding the Strain Gage Measurement Circuits

This section describes the strain gage measurement circuits used by each

strain gage multiplexer. These circuits include:

• Wheatstone Bridge

• Chevron Bridge

• Wagner Ground

Chapter 4 Understanding the Strain Gage Multiplexers 53

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Agilent Technologies E1356A Specifiche Pagina 54