A low cost capacitive bridge based on voltage drop balance

作者：Mariscotti A^*

来源：Measurement, 2010, 43(9): 1094-1098.

DOI：10.1016/j.measurement.2010.04.007

• Electric variables measurement
• Capacitance measurement
• Capacitance bridge
• Uncertainty

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.

• 出版日期2010-11