Measurement Computing WBK Options - Manual (Page 53)

CN-189, DB9 Adapter Option
CAUTION
Remove the WBK16 from power and disconnect the unit from all externally
connected equipment prior to connecting cables, signal lines, and/or removing the
cover to install or remove components. Electric shock or damage to equipment can
result even under low-voltage conditions.
Take ESD precautions (packaging, proper handling, grounded wrist strap, etc.)
Use care to avoid touching board surfaces and onboard components. Only handle
boards by their edges (or ORBs, if applicable). Ensure boards do not come into
contact with foreign elements such as oils, water, and industrial particulate.
Be careful to avoid component damage while the WBK16 module is open. Always
remove bridge completion headers (CN-115) from the unit before soldering resistors
in the headers.
The CN-189 option consists of two 7-pad jumpers (P3 and P4), a DB9 connector, and a 9-slot screw-
terminal block. The adapter plugs into channel input DB9 connectors on StrainBooks and WBK16
expansion modules.
With use of the terminal block and appropriate shorting of jumper pads, the user can easily set up the
desired bridge configuration. A table indicating bridge types and the respective CN-189 jumper pad shorts
follows shortly. In some cases, the user may want to install a resistor at location R1. The electrical
relation of CN-189 components is shown in the following schematic.
CN-189 DB-9 Adapter Option
The CN-189 is intended for convenience and is not shielded. Higher signal quality will
be obtained with the use of shielded cables, such as the CA-177 strain gage cable.
WBK16, Strain-Gage Module 949794 WBK16, pg. 13