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  • BSI
    BS 7737-1:1995, IEC 60377-1:1973 Recommended methods for the determination of the dielectric properties of insulating materials at frequencies above 300 MHz - General
    Edition: 1995
    $266.02
    / user per year

Description of BS 7737-1:1995 1995

This recommendation applies to the procedures for the determination of relative permittivity and dielectric dissipation factor and of quantities related to them, such as loss index, of dielectric materials in the microwave frequency region (i.e. frequencies above about 300 MHz up to optical frequencies).

Unlike the test methods employed at lower frequencies (see IEC Publication 250), the test methods dealt with in this recommendation use test specimen and/or test set-up dimensions larger than or comparable to the wavelength of the electromagnetic field of the test frequency.

In theory, the methods described apply only to test materials having the permeability of absolute vacuum. Good approximation in general is obtained for dia- and paramagnetic materials (so-called non-magnetic materials) whereas with ferro- and ferrimagnetic materials special procedures have to be chosen to separate the dielectric and magnetic properties. These latter methods, however, are beyond the scope of this recommendation.

Note on magnetic properties. – Specimens showing magnetic properties may be tested according to this recommendation if permeability is driven into saturation by a d.c. magnetic bias field of sufficient intensity.

With special precautions and by the use of suitably designed measuring cells, liquids and fusible materials can be measured, as well as solid materials, by the methods described.

The measured values are dependent on physical conditions such as frequency, temperature, moisture content, and in special cases on field strength as well.

All measurements and calculations of this recommendation are based on a sinusoidal waveform of angular frequency ω = 2πf.



Recommends procedures to determine the relative permittivity and electric dissipation factor such as loss index in the microwave frequency region.

Standard NumberBS 7737-1:1995, IEC 60377-1:1973
TitleRecommended methods for the determination of the dielectric properties of insulating materials at frequencies above 300 MHz - General
StatusDefinitive
Publication Date1995-10-15
Identical National Standard OfIEC 60377-1:1973
DescriptorsElectrical testing, Dissipation factor, Dielectric properties, Frequencies, Electrical insulating materials, Permittivity measurement, Testing conditions, Electrical measurement
ICS29.035.01 Insulating materials in general
CommitteeGEL/15
ISBN0 580 24784 8
PublisherBSI
Pages14

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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