# Q meter

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## Q meter

A direct-reading instrument widely used for measuring the *Q* of an electric circuit at radio frequencies. Originally designed to measure the *Q* of coils, the *Q* meter has been developed into a flexible, general-purpose instrument for determining many other quantities such as (1) the distributed capacity, effective inductance, and self-resonant frequency of coils; (2) the capacitance, *Q* or power factor, and self-resonant frequency of capacitors; (3) the effective resistance, inductance or capacitance, and the *Q* of resistors; (4) characteristics of intermediate- and radio-frequency transformers; and (5) the dielectric constant, dissipation factor, and power factor of insulating materials. *See* Electrical measurements, Q (electricity)

## Q meter

[′kyü ‚mēd·ər]*Q*of an electric circuit at radio frequencies by determining the ratio of inductance to resistance, and which has also been developed to measure many other quantities. Also known as quality-factor meter.

## Q meter

A direct-reading instrument widely used for measuring the *Q* of an electric circuit at radio frequencies. Originally designed to measure the *Q* of coils, the *Q* meter has been developed into a flexible, general-purpose instrument for determining many other quantities such as (1) the distributed capacity, effective inductance, and self-resonant frequency of coils; (2) the capacitance, *Q* or power factor, and self-resonant frequency of capacitors; (3) the effective resistance, inductance or capacitance, and the *Q* of resistors; (4) characteristics of intermediate- and radio-frequency transformers; and (5) the dielectric constant, dissipation factor, and power factor of insulating materials.