Agilent Technologies E1356A Especificações Página 110

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Procedure The leadwire resistance is determined with the following parameters:
the voltage across the lower leg 1k internal half bridge resistor
(V_lower)
the bridge output voltage (Vout)
the voltage across the leadwire (V_leadwire)
the 120 or 350 bridge completion resistor (Rcomp).
These parameters are represented with the circuit of Figure C-2 and the
leadwire resistance is calculated using the equation:
R_leadwire = (V_leadwire x Rcomp)/(V_lower + Vout - V_leadwire)
Figure C-1. Externally Supplied Bridge Excitation Voltage
Figure C-2. Determining Leadwire Resistance
Appendix C Strain Gage Diagnostics 109
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