DESCRIPTION
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.
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.
MOUNTING
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.
SPECIFICATIONS
Maximum Excitation
120 Ohm Bridge:
10 VDC
350 Ohm Bridge:
16 VDC
Temperature Limits:
-20 to 80°C
(-4 to 176°F)
Temperature Effects:
±1.5 microvolts/volt/°C
Zero Adjust:
±6 mV/V
Resistor Tolerance:
±0.1%
Resistor TEMPCO:
5 PPM/°C
Dimensions:
3.0" W x 1.25" H x 1.0" D
(50.8 mm x 31.8 mm x
25.4 mm)
Mounting Holes:
0.175" holes (2) on
2.5" center
BCM-1 HOOKUP
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 lEX and -EX. The readout
device is connected to the two center terminals which are
l 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.
+BRG
+BRG
+SIG
120
350
-BRG
* FOR 2
W
IRE
GAGES INSTALL
JUMPER FROM
+SIG TO
120 TERMINAL
FIG.1 1/4 Bridge 120
Ω
Hook-Up
BCM-1
+BRG
+BRG
+SIG
120
350
-BRG
* FOR 2
W
IRE
GAGES INSTALL
JUMPER FROM
+SIG TO
350 TERMINAL
FIG.2 1/4 Bridge 350
Ω
Hook-Up
BCM-1
+BRG
+BRG
+SIG
120
350
-BRG
FIG.3 1/2 Bridge Hook-Up
BCM-1
*
*
Figure 1. 1/4 Bridge 120
Ω
Hook-up
Figure 2. 1/4 Bridge 350
Ω
Hook-up
Figure 3. 1/2 Bridge Hook-up
BCM-1
Bridge Completion Module
INSTRUCTION
SHEET
M1760/1106
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