The proposed bridge has a simple analog design featuring few components and may be implemented inexpensively at any laboratory. Yet, it is characterized by a low input stray capacitance (1 pF in the prototype with margin for improvement) and a very good accuracy, in terms of measurement uncertainty and repeatability: the method of balancing successive readings of the voltage drops across the ‘‘capacitor under test” and a reference resistor uses at best the external voltmeter in terms of measurement accuracy and avoid the need for a voltage reference and related stability issues.
A low cost capacitive bridge based on voltage drop balance
MARISCOTTI, ANDREA
2010-01-01
Abstract
The proposed bridge has a simple analog design featuring few components and may be implemented inexpensively at any laboratory. Yet, it is characterized by a low input stray capacitance (1 pF in the prototype with margin for improvement) and a very good accuracy, in terms of measurement uncertainty and repeatability: the method of balancing successive readings of the voltage drops across the ‘‘capacitor under test” and a reference resistor uses at best the external voltmeter in terms of measurement accuracy and avoid the need for a voltage reference and related stability issues.
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