Capacitance Meter


Also found in: Wikipedia.

capacitance meter

[kə′pas·ə·təns ‚mēd·ər]
(engineering)
An instrument used to measure capacitance values of capacitors or of circuits containing capacitance.

Capacitance Meter

 

an instrument for the measurement of the electrical capacitance of capacitors, electronic and semiconductor devices, cables, and conductors.

Several methods exist for the measurement of capacitance; the bridge method is considered to be the most accurate. The capacitance Cx to be measured is connected to the measuring bridge arm (see Figure 1). Alternating current from the builtin generator G is fed to one of the diagonals of the bridge. A balance indicator I (for example, a pointer device) is connected to the other diagonal of the bridge through an amplifier U. The bridge is balanced by selecting the reference capacitor CP that produces the minimum deflection of the balance indicator. By changing the ratio R1R2, it is possible to select the required measurement range from 10 attofarads (10-17 farad) to 1 microfarad (106 farad). The measurement error usually does not exceed 1 percent.

Figure 1. Block diagram of a capacitance meter: (G) AC generator, (M) measuring bridge, (/) balance indicator, (U) amplifier, (C,) capacitance being measured. (C,) reference capacitor, (R1,) and (R2) resistors, (1)-(4) arms of bridge

In measuring the capacitance of electrolytic capacitors or in conducting measurements at high frequencies (up to one gigahertz), the ohmic losses within the capacitors must be taken into account. In such cases the bridge circuit is supplemented by reference resistors and compensating capacitors and is also carefully shielded. Capacitance meters with automatic balancing and a digital readout have been developed.

REFERENCES

Izmereniia v elektronike: Spravochnik, vols. 1–2. Compiled and edited by B. A. Dobrokhotov. Moscow-Leningrad, 1965.
Valitov, R. A., and V. N. Sretenskii. Radiotekhnicheskie izmereniia. Moscow, 1970.

E. G. BILYK

References in periodicals archive ?
Cichy, "Virtual capacitance meter based on impedance modulus measurement", in Proc.
A chartered surveyor will undertake the correct investigation with the aid of the appropriate equipment, such as electronic moisture meter, capacitance meter and electronic hygrometer to ensure the correct diagnosis.
Crosschecks were made with an electrometer and a capacitance meter.
During the study, the resistance meter was checked against a known resistance block, and the capacitance meter was calibrated against a capacitance plate.
The Agilent 4288A capacitance meter is designed to perform high speed measurements of capacitance while taking up less room in an automated test equipment (ATE) system and providing a high level of accuracy.
Simple stray-free capacitance meter by using an operational amplifier // IEEE Transactions on Instrumentation and Measurement, 1983.
Agilent's updated range of compact and robust handheld test tools includes the U1210A series clamp meters, U1240B series DMMs, U1250B series DMMs, U1401B multi-function calibrator/meter, U1600B series oscilloscopes, U1701B capacitance meter and U1730B series LCR meters.
By extending the tradition of Agilent's industry-leading benchtop models to a lower price point, the new Agilent U1701A capacitance meter and U1731A/U1732A LCR meters let engineers perform quick, basic measurements at their convenience.
Tenders are invited for Digital Capacitance Meter,3 1/2 Digits,Lcd Display,1999 Counts With Automatic Sign And Function , 01 Function,10 Ranges From 200 Pico Farad-200 Uf With Over Range Indication, Automatic Polarity Positive Implied And Negative Polarity Indicatiojn , Low Battery Indication.