Omega Speaker Systems Network Router BCM 1 User Manual

BCM-1  
Bridge Completion Module  
M1760/1106  
INSTRUCTION  
SHEET  
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DESCRIPTION  
BCM-1 HOOKUP  
The OMEGA® BCM-1 Bridge Completion Module provides  
a convenient means of completing the Wheatstone Bridge  
circuit used for strain gage measurements. The module  
can be used for quarter bridge measurements with 120 or  
350 ohm gages or for half bridges with gages of any  
resistance. Quarter bridges with two or three wire hookup  
can be accommodated. In addition, a bridge balance  
adjustment potentiometer is provided to zero the bridge  
output. Screw terminals are provided for strain gage,  
excitation, and output signal connections.  
Connections to the BCM-1 are made using the screw  
terminals on the top of the unit using stripped wires. One  
side has four terminals used for excitation and signal  
output connections. The excitation voltage is connected to  
the outer terminals labeled +EX and -EX. The readout  
device is connected to the two center terminals which are  
labeled + and - Vout.  
Connection of the strain gages to the BCM-1 depends on  
the particular application. For the proper hookup, refer to  
Figures 1-3.  
The BCM-1 is constructed using precision resistors with 5  
PPM/°C temperature coefficient for maximum temperature  
stability. The unit is completely encapsulated for use in  
rugged environments and can be mounted by using the  
screw holes provided in the baseplate.  
BCM-1  
+BRG  
* FOR 2 WIRE  
+SIG  
MOUNTING  
GAGES INSTALL  
JUMPER FROM  
120  
The BCM-1 module is equipped with a baseplate which  
provides holes for screw mounting. Where required, it can  
also be glued or secured in place with double-sided tape  
or Velcro.  
+SIG TO  
*
120 TERMINAL  
350  
-BRG  
FFi  
g
u
re
1
.
1
B
r
id  
g
e
1
2
0
Hook-up  
SPECIFICATIONS  
Maximum Excitation  
BCM-1  
+BRG  
120 Ohm Bridge:  
350 Ohm Bridge:  
10 VDC  
16 VDC  
* FOR 2 WIRE  
+SIG  
120  
Temperature Limits:  
-20 to 80°C  
GAGES INSTALL  
JUMPER FROM  
+SIG TO  
(-4 to 176°F)  
Temperature Effects:  
Zero Adjust:  
1.5 microvolts/volt/°C  
6 mV/V  
350 TERMINAL  
350  
*
-BRG  
Resistor Tolerance:  
Resistor TEMPCO:  
Dimensions:  
0.1%  
Figure 2. 1/4 Bridge 350Hook-up  
5 PPM/°C  
BCM-1  
+BRG  
3.0" W x 1.25" H x 1.0" D  
(50.8 mm x 31.8 mm x  
25.4 mm)  
+SIG  
120  
Mounting Holes:  
0.175" holes (2) on  
2.5" center  
350  
-BRG  
Figure 3. 1/2 Bridge Hook-up  
F
 

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