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Bridge Completion
Channels
Bridge Wiring
Diagrams
H L G Voltmeter
Terminals
Chapter 2
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The strain gages mounted to the specimen are connected to the terminal
module bridge completion channels via the +E, -E1, -E2, H, L, and G
terminals. Each channel contains these six terminals in order to
⁄
accommodate a
1
,
4
terminal by:
1. loosening the screw on the terminal,
2. inserting the wire into the opening opposite the screw,
3. tightening the screw to secure the wire in place.
Routing the wires under the strain relief clamp will prevent the wires from
being pulled out of the terminal.
⁄
⁄
The
1
,
1
, and full bridge wiring diagrams on the terminal module cover
4
2
(Figure 2-1B) indicate the connections between the strain gage bridge
arrangement and the channel terminals. The six points on the diagrams: +E,
-E1, -E2, H, L, and G correspond to the six wiring terminals on each bridge
completion channel. These points also correspond to the points shown on
the Wheatstone Bridge on
configurations are:
•
⁄
1
bridge - +E -E1 H G
4
•
⁄
1
bridge - +E -E2 H G
2
•
full bridge- +E -E2 H L G
An example of how the diagram relates to gage wiring is shown for the
bridge arrangement in Figure 2-2.
Figure 2-2. 1/4 Bridge Arrangement Wiring Diagram
The common high (H), low (L), and guard (G) terminals are the same point
electrically as the H, L, and G terminals of the bridge completion channels.
These common terminals allow for strain measurements using an external
voltmeter (see " Measurements Using an External Voltmeter" on
Connecting Strain Gages to the Multiplexers
⁄
1
, or full bridge arrangement. A wire is connected to a
2
page
54. The terminals used by the bridge
⁄
1
4
page
63).
25
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