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7
D
A
C
B
LEMO pin 7
Figure 12.33:
The driven guard approach to minimize induced noise
A
Strain gauges
B
Signal conductors
C
Outer shield
Terminated near strain gauges
-
Signal source
D
Inner shield
Driven guard at +Vcm
12.4.6
Various bridge configurations
The diagrams below shows possible bridge configurations.
GUARD
1/4 BRIDGE
COMPL.
- INPUT
+ V_EXC
pin 1
pin 7
pin 6
pin 10 (350Ω) or
pin 9 (user value)
Red
White
Shield (optional)
Figure 12.34:
Three
-
wire quarter bridge
GEN3t
I3995-3.1 en HBM: public
293