You may use the Model 10CJB-2 Bridge Completion Card to connect
the 4077's input to its "real-world" gage configuration. The function of
the 10CJB-2 is to "complete" the connected bridge—that is, to allow it
to be "seen" by the 4077 as a full (4-arm) Wheatstone bridge. Note that
you may provide your own bridge-completion circuitry (equivalent to the
10CJB-2), if desired, in which case you should contact the factory for
instructions on connections.
1. 10CJB-2 Cabling
Remove the top plate of the Model 10CJB-2 box (4 screws in
corners). Inside the box are two sets of labelled screw terminals:
"A" and "B" (only
one
of the terminal sets will be used, since the
4077 is a single-input instrument). The terminals are labelled
–SIG, 1/2 BR, –EX, 120, 350, +SIG, and +EX. As shown in the
following figures, you will connect your gage wires directly to these
terminals, and, if necessary, interconnect certain terminal pairs by
means of jumper wires. Gage leads should enter the 10CJB-2
through the cutout on the right-hand side of the box.
NOTE: The user must furnish his own
pin-to-pin shielded cable
for
connecting the 10CJB-2 box to the 4077's rear I/O CONNECTOR.
Daytronic will supply terminal connectors for this cable.
Fig. 14(a) shows the connections you must make to a 2-wire 1/4-
bridge gage configuration (represented by the resistor "RG").
Here, you must install a jumper wire between the –SIG and 1/2 BR
terminals, and between the +SIG terminal and
either
the 120
terminal
or
the 350 terminal, depending on the nominal resistance
of RG.
Fig. 14(b) shows connections to a 3-wire 1/4-bridge gage
configuration (again represented by "RG"). Here again, the –SIG
and 1/2 BR terminals are tied. The gage's third (self-
compensating) lead is connected
either
to the 120 terminal
or
to
the 350 terminal, depending on the nominal resistance of RG.
Fig. 14(c) shows connections to a 1/2-bridge gage configuration
(represented by the resistors "RG1" and "RG2"). Here again, the
–SIG and 1/2 BR terminals are tied.
Optional Model 10CJB-2 Bridge Completion Card F
F.1
Cabling & Calibration of a 4077 That Uses an
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