How to Select Capacitance Meters
Image Credit: All-Spec | Allied Electronics | Metric Test
Capacitance meters are instruments that measure capacitance, the ability to store an electric charge. They are used to test, inspect and sort ceramic and other types of capacitors on production lines. In addition to frequency, capacitance meters are specified according to measurement parameters.
Capacitance Meter Specifications
Product specifications also include:
- Measurement speeds: short and long. Short-mode devices provide capacitance measurements more quickly, but are not accurate as long-mode capacitance meters.
Measurement signal frequency
Averaging range and resolution
Internal and external trigger
Trigger delay time
Display renewal timing
Capacitance meters carry measurement parameters Cp-D, Cp-Q, Cp-Rp, Cp-G, Cs-D, Cs-Q and Cs-Rs.
Cp equals the capacitance value measured with the parallel equivalent circuit model.
Cs is the capacitance value measured with the series equivalent circuit model.
D, the dissipation factor, is a value that represents the tendency of an insulating or dielectric material to absorb some of the energy in an AC signal.
Q, the quality factor, is the inverse of D.
G is the equivalent parallel conductance measured with the parallel equivalent circuit model.
Rp is the equivalent series resistance measured using the series equivalent circuit model with capacitance meters.
Capacitance Performance Specification
Performance specifications for capacitance meters include
Allowable frequency range and accuracy
Level range resolution and accuracy
Output impedance at both 1 KHz and 1 MHz
Functions are often described as compensation, comparator, data buffer, deviation measurement, low-C reject, and save or recall. Capacitance meters also carry specifications for power source, operating and storage environment, and product weight.
Capacitance meters may bear marks from various national and international approval organizations. For example, the European Union requires CE marks for all electric and electronic equipment that will be sold, or put into service for the first time anywhere in the European community. Capacitance meters that bear a CSA Mark have been tested by the Canadian Standards Association (CSA) and meet applicable standards for safety and/or performance. These standards are written and administered by organizations such as the American National Standards Institute (ANSI), Underwriters Laboratories (UL), and CSA International. The International Electrotechnical Commission (IEC) also prepares and publishes standards for capacitance meters.
- 3 Digits
- 4 Digits
- 5 Digits
- 6 Digits
- 7 or More Digits
- Adjustable Sampling Rate
- Alarm LED
- Application Software
- Battery Powered
- Bench / Free-Standing
- CE Marking
- CSA Mark
- Clamp Meter
- Data Acquisition
- Data Storage / Logging
- IEC 61010
- Output Interface:Other
- Overload Protection
- Plus 1/2 Digit