MicroStrain, Inc.
16
Connecting a half bridge strain gauge
This example assumes the SG-Link® OEM is configured with the optional internal
half
bridge completion resistors. If not, the completion of the bridge (shown as internal
circuitry) must be completed externally.
It is strongly recommended that shielded wiring
be used, as this can significantly reduce system noise.
Please note that the shield of each
cable must be grounded at one location only, to prevent the occurrence of ground loops.
Shielded wiring can be purchased from Alphawire (part number 1122,
www.alphawire.com
); a sample is included with each starter kit.
Figure 3
+Pin (Signal)
-Pin (Signal)
Ground Pin
S+ (Pin 2)
S- (Pin 3)
GND (Pin 4)
Table 5
S+
Ground
Ground
Sensor -
S-
P+
Sensor Power
Rg
Rg
RL*
RL*
RL*
Rg
(Active)
Rg
(Active)
Shield
(Drain)
Internal Circuitry
*RL=Lead Resistance
