Abstract
This paper presents a circuit functioning as a direct reading capacitance meter suitable for measuring capacitances of comparatively high loss materials. This circuit may find a wide range of application in industry.
A measuring instrument to be used for this purpose must be insensitive to any resistance change in the materials and stable for long hours continuous operation.
The minimum equivalent parallel resistance of the specimen which has no influence on the capacitance measurement reaches as low as 1kΩ and the measuring range of capacitance is about 10-2∼103pF at 2MHz. A stability of less than 0.5μA in terms of zero drift was obtained during several hours continuous operation.
