Specifications

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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