Measurement Computing WBK Options - Manual (Page 48)

Configuration Diagrams
Full-Bridge Configurations
The full-bridge has four strain-variable elements and requires no bridge completion components. Quarter and
half-bridge resistors may be left installed. Any bridge resistance from 60 to 1000 ohms can be accommodated.
Full-Bridge (+), Any Resistance from 60 to 1000 Ohms
IA
1
8
9
7
5
4
3
6
2
External
Bridge DB-9
Input
Internal Bridge Completion
RA RB RC RD RE RF RG
RH
1
2
3
-Sense
+Sense
+Excitation
-Excitation
JN01
Switches
accessed
through
software
In this connection, excitation voltage is
regulated at the connector. This
configuration should only be used for
short cable lengths. Output polarity may
be altered by interchanging the (+) and (-)
input or by selecting the software invert
function.
Full-Bridge (+), with Remote Sense
IA
External
Bridge DB-9
Input
Internal Bridge Completion
RA RB RC RD RE RF RG
RH
1
2
3
-Sense
+Sense
+Excitation
-Excitation
JN01
Switches
accessed
through
software
1
8
9
7
5
4
3
6
2
In this connection, excitation voltage is
regulated at the strain gage.
This eliminates errors due to cable
losses and is the preferred connection
for longer cables.
Full-Bridge (+), with B, D, or F Shunt
IA
External
Bridge DB-9
Input
Internal Bridge Completion
RA RB RC RD RE RF RG
RH
1
2
3
-Sense
+Sense
+Excitation
-Excitation
JN01
Switches
accessed
through
software
1
8
9
7
5
4
3
6
2
The B, D, or F shunt resistor may be
software selected when installed as
shown. Output polarity during shunt
calibration will be automatically
corrected by software. The shunt resistor
value will typically be different for each
value of bridge resistance.
WBK16, pg. 8 949794 WBK16, Strain-Gage Module