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12.4.2
Input connectors
The LEMO 2B316 connector pin
-
out is compatible with the Liberty data
acquisition system. The mating male connector is LEMO P/N
FGG2B316CLADxx, where xx is the desired cable collet size or a similar size.
12.4.3
Bridge completion
Each bridge amplifier channel contains a pair of fixed 10 kΩ resistors for half
-
bridge completion that can be switched in by software control. The user can
install two resistors on the removable bridge completion card for another value
and/or precision half
-
bridge completion. If so, a soldered jumper must be
removed for correct operation.
Additional pins on the LEMO connector provide a precision 350 Ω resistor, plus
an additional value for quarter
-
bridge completion that has been provided by a
user. The user
-
provided value is located on a removable bridge completion
card. The completion sockets are designed for Vishay Micro Measurements
S
-
Type resistors but can be used with other similar types. A diagram of the card
layout on one of the following page shows the location of each resistor.
12.4.4
Shunt calibration
Each bridge amplifier channel contains 100 KΩ and 20 KΩ, 0.1% fixed precision
resistors that can be switched in by software control. With a gage factor of 2.00,
this resistor simulates the following values of deflection for various bridge
configurations.
Table 12.6: Deflection for various bridge configurations
100 KΩ
20 KΩ
BRIDGE
1000 Ω
350 Ω
120 Ω
1000 Ω
350 Ω
120 Ω
mV/V
2.4888
0.873
0.299
12.20
4.337
1.495
μstr full
bridge
1244
437
150
6098
2169
748
μstr
1
/
2
bridge
2488
873
300
12195
4337
1496
μstr
1
/
4
bridge
4975
1747
600
24390
8674
2991
A convenient plug
-
in module is provided to install one additional user
-
supplied
shunt resistor on each channel. The diagram below shows the location of the
resistors completed by the user. A fourth calibration resistor can be connected
to the connector pins externally. Any of the four available shunt cal resistors
can be switched in by software control to provide multi
-
point calibration and
linearity verification.
GEN3t
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