Shunt Calibration for Dummies; a Reference Guide - Interface Force

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16. Is There Reason to Prefer Any Particular Leg of the Bridge to Shunt ? • Probably not. • In terms of stability and repeatability, all legs are contributing equally to a shunt measurement. • R5 and R6 contribute equally to Vs for shunt measurement on any leg regardless of their values. Remember paragraph 6 ! Vs ≈ 250 Rs + 0. 5 Rb ⎛ R6 + R5 ⎞⎛ R6 − R5 ⎜1− ⎟⎜1 + ⎝ 4Rs ⎠⎝ R6 + R5 + Rb ⎞ ⎟ ⎠ 30
17. Can a Value for Vs be Calculated for any Rs, Knowing Only Rin and Rout of the Bridge ? • Only approximately because Rin and Rout only approximate the value of R1, R2, R3, or R4 in the basic circuit. • With tolerances typical of strain gages and bonding processes in transducer production, 0.25% is about the uncertainty of a calculation for Vs with the basic circuit. • It gets worse if R5, R6, or R7 are present. 31
Page 1 and 2: Shunt Calibration for Dummies; a Re
Page 3 and 4: 1. What is Shunt Cal ? • Shunt Ca
Page 5 and 6: 3. Shunt Cal has some advantages
Page 7 and 8: 4. About Formulae (continued) • I
Page 9 and 10: Simplified Basic Bridge Circuit, R1
Page 11 and 12: Basic Bridge Formula Inverted to so
Page 13 and 14: Vs 6. Bridge With Series Trim or Co
Page 15 and 16: Series resistor circuit examples Rb
Page 17 and 18: Parallel resistor circuit examples
Page 19 and 20: 9. What Errors are Contributed by E
Page 21 and 22: Conductor Gauge 4-Conductor Error E
Page 23 and 24: 10. What Error is Contributed by a
Page 25 and 26: 12. Why are 8-Conductor Cables Some
Page 27 and 28: Rb (ohm) Error due to Physical Load
Page 29: 15. What is the Effect on Shunt Cal
Page 33 and 34: . Internal to an Instrument. • Lo
Page 35 and 36: 500 DMA DCA These lower cost signal
Page 37 and 38: d. External, laboratory instrument.
Page 39: Shunt Calibration Repeatability Dat

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