Title:
PARALLEL T-TYPE HIGH FREQUENCY BRIDGE DEVICE
Document Type and Number:
Japanese Patent JP3154154
Kind Code:
B2
Abstract:
PURPOSE: To continuously, automatically and quickly perform the measurement of a sample, and facilitate the direct read of a measurement value.
CONSTITUTION: The capacities of variable capacity diodes 1a, 1b of two sides of a bridge circuit 1 are capacity-swept with capacity sweep waves having a determined frequency difference which are outputted from a capacity sweep circuit 3, respectively. The amplitude change of the bridge output current accompanying the capacity sweep is detected by a wave detecting circuit 5, and the point of time of a maximum amplitude is detected by a peak detecting circuit 7, whereby an equilibrium timing signal is provided. This signal is used as a sampling signal to sample the capacity sweep wave with a sample hold circuit 8. The hold output is applied to a variable capacity diode 9a or 9b having the paired characteristic with the variable capacity diodes of the bridge sides capacity-swept by the sweep wave to be sampled, and the capacity at this time is detected by a capacity detecting circuit, whereby the value of the imaginary number or real number component of a sample 1e is indicated by an indicating part 10.
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Inventors:
Nagashima, Choju
Application Number:
JP25881592A
Publication Date:
April 09, 2001
Filing Date:
August 15, 1992
Export Citation:
Assignee:
Nagashima, Choju
International Classes:
G01R17/04; (IPC1-7): G01R17/04