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US 4,283,676 AGranted
Direct reading capacitance meter
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorClifford O. Shaw
Life of this patent
Estimating the term…
Abstract
A high capacitance measuring apparatus which provides a direct reading of unknown large capacitor using a voltage comparator, a multi-vibrator flip-flop circuit, and a ramp generator. A timing post which corresponds to one RC time for the capacitor being measured feeds into a ramp generator. The ramp generator output produces an indication on a calibrated meter to give a direct reading.
Claims5
A device for measuring the value of a capacitor comprising:
- terminal means for connecting a test capacitor;
- a voltage divider that receives an initial voltage and transmits a predetermined reference voltage;
- sensing means connected to the output of said terminal means and to said voltage divider;
- control means for transmitting a voltage to said sensing means and to said terminal means;
- switching means for receiving and sending a first signal, and further for receiving and sending a second signal;
- a ramp generator having a plurality of charging ranges connected to said switching means to receive a first signal and to supply a voltage and further, to receive a second signal and to stop supplying a voltage;
- a reference capacitor connected to said ramp generator;
- a capacitance reading meter effectively connected to said reference capacitor;
- a trigger having a first and a second mode such that in said first mode no voltage is transmitted and in said second mode a voltage is transmitted simultaneously to said switching means and to said control means, wherein the value of a capacitor is directly determined.
6 more elements
Dependencies are inferred from the claim text.