BCM-1
Bridge Completion Module
M1760/1106
INSTRUCTION
SHEET
For latest product manuals: omegamanual.info
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
Ω
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 350Ω Hook-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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