Shunt Verification - Agilent Technologies HP E1355A User Manual

Shunt Verification

Appendix C
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The Shunt Verification diagnostic accessed through internal channels 12
and 13 checks the bridge completion circuitry and strain gage arrangement.
The diagnostic places internal resistors in parallel with an internal bridge
arm or strain gage to simulate a known value of tensile or compressive
strain. This diagnostic can be used on any bridge completion channel.
A known value of tensile strain is simulated by placing a 158kΩ resistor in
parallel with the upper leg 1kΩ internal half bridge resistor. A known
compressive strain is simulated by placing a 59kΩ resistor in parallel with
the strain gage on the bridge completion channel specified (Figure C-4).
If the (tensile or compressive) strain measured is equivalent to the simulated
value, the bridge completion circuitry is functioning properly and the
configuration is set up correctly.
Figure C-4. Shunt Verification Resistors
Strain Gage Diagnostics 113