NEW APPROACH TO THE ACCURACY DESCRIPTION OF BROADLY VARIABLE RESISTANCE CIRCUITS ON THE EXAMPLE OF PT100 SENSOR BRIDGES |
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| Zygmunt Lech Warsza, Jarosław Makal |
- Abstract:
- New approach to accuracy measures of open circuit transfer functions of the arbitrary variable arm resistance bridge supplied by current or voltage, are presented. Obstacle that near the bridge balance state relative errors or uncertainties are rising to ± ∞ was bypassed by relating the absolute value of any bridge accuracy measure to the initial sensitivity of the current to voltage bridge transfer function or of voltage to voltage transfer function as these sensitivities do not change within the bridge imbalance. The new double component approach is also introduced as sum of relative accuracy measures of initial stage and of bridge transfer function increment from that stage. Absolute error after subtracting its initial value is referenced to the transfer function. This is similar method as two-component accuracy description of broad range instruments, e.g. digital voltmeters. Such method, not applied jet for unbalanced bridges is very promised and vaslid for any sensor characteristic. Equations for measures of unbalanced bridges of equal initial arm resistances and with sensors of increments ± ε in four arms, in different arm pairs or in one arm are collected in Table 3. References to Pt sensor bridges analysis are given and conclusions are formulated.
- Download:
- IMEKO-TC4-2008-180.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC4
- Event name:
- Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
- Title:
- XVIth IMEKO TC4 International Symposium on Electrical Measurements and Instrumentation (together with 13th IMEKO TC4 Workshop on ADC Modelling and Testing)
- Place:
- Florence, ITALY
- Time:
- 22 September 2008 - 24 September 2008