Measurement Computing WBK Options - Manual (Page 72)

External Shunt Calibration (2 Pt Shunt)
This calibration method requires the use of a WBK16/LC option, which is discussed elsewhere in the document.
The method supports the use of an external shunt resistor. The resistor is shunted across the gage using the (RF)
switch in the StrainBook or WBK16. The method appears simply as "Shunt" in the list of calibration methods
when either “Load Cell” or “Transducer” is selected as the sensor type.
Note: The WBK16/LC provides a non-committed dry contact on two pins of a single StrainBook or WBK16
channel connector. The WBK16/LC can be used for virtually all single value shunt calibration requirements,
some of which are not possible with the internal FET/analog switch provisions in the standard channel
configurations.
WBK16/LC
CAUTION
Make the DB9 pin # 2 connection to the “low-side” or the “high-side” of the
circuit. BUT NEVER TO BOTH! Doing so will create a short circuit that could
damage equipment.
External Shunt Resistor, Low-Side Connection
Full Bridge (+) with External Shunt Resistor
DB9 Pin 2 Connected to the Low-Side
Reference Note:
The WBK16/LC Load Cell Shunt Cal internal option board is detailed in an early section.
That section includes an alternate schematic for connecting Pin 2 to the High-side.
WBK16, pg. 32 949794 WBK16, Strain-Gage Module