Direct Reading Capacitance Meter.

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Abstract:

This invention relates to an apparatus for measuring capacitance, especially large capacitance. The resulting measurement is displayed on a meter calibrated in capacitance. One method of determining the capacitance of a large, unknown capacitor is to charge it to a predetermined DC voltage, then discharge it through a known resistor and an SCR while observing the discharge wave form on an oscilloscope. Another method is to insert the unknown capacitor in a bridge circuit in which fixed capacitors and, in some cases, other circuit elements are provided. The present invention obviates the above mentioned prior art by providing a direct reading capacitance meter for measuring a wide range of capacitances. The invention has circuits for a voltage comparator and logic trigger, a flip-flop multi-vibrator, and a ramp generator. The output voltage of the ramp generator is determined by the duration interval of the input pulse, and produces a reading on a meter which is calibrated in three ranges of capacitance to provide the user with a direct reading capacitance meter.

Author(s):
Shaw, Clifford O.
Author Organization(s):
DEPARTMENT OF THE NAVY WASHINGTON DC
Descriptive Note:
Patent Application,
Pagination:
0017

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Availability: This Government-owned Invention Available For U.s. Licensing And, Possibly, For Foreign Licensing. Copy Of Application Available Ntis.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
PAT-APPL-127 707
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*Patent applications, *Electrical measurement, Capacitance, Waveform generators
Field(s)/Group(s):
Test Facilities, Equipment and Methods
Keyword(s):
Capacitance meters, Direct reading capacitance meters
Report Date:
1980 Mar 06