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IEEE 1308
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IEEE 1308 94th Edition, December 13, 1994 Recommended Practice for Instrumentation: Specifications for Magnetic Flux Density and Electric Field Strength Meters—10 Hz to 3 kHz
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Description / Abstract:
This recommended practice identifies specifications that should
be provided to characterize instrumentation used to measure the
steady state rms values of magnetic and electric fields with
sinusoidal frequency content in the range 10 Hz to 3 kHz in
residential and occupational settings as well as in transportation
systems. The dynamic ranges of interest are 0.01 μT (0.1 mG) to 10
mT (100 G) and 1 V/m to 30 kV/m for magnetic and electric fields,
respectively. In addition, this recommended practice
— Defines terminology
— Describes general characteristics of fields
— Surveys operational principles of instrumentation
— Indicates methods of calibration
— Identifies significant sources of error
While field meter specifications are identified, frequencies and field levels that should be used for calibration purposes, and limits on measurement uncertainty are not recommended in this standard. Rather, it is left to standards that describe measurement protocols for different environments to indicate specific calibration points and uncertainty requirements.
NOTE—For example, IEEE Std 644-1994 [B15]1 limits the total uncertainty during calibrations of magnetic and electric field meters used in the vicinity of ac power lines to ±3%.
However, sources of uncertainty during calibration and measurements are identified and guidance is provided on how they should be combined to determine total measurement uncertainty.
Throughout this recommended practice, the words "magnetic flux density" and "magnetic field" will be considered synonymous. In regard to electric field measurements, this recommended practice considers electric field meters that only measure the unperturbed electric field strength at a point in space (i.e., the electric field prior to the introduction of the field meter) or on conducting surfaces. Measurement protocols are not provided. Protocols for measuring electric and magnetic fields near power lines and video display terminals are described in IEEE Std 644-1994 [B15] and IEEE Std 1140-1994 [B16], respectively. Protocols for measuring only power frequency electric fields are described in IEC Publication 833 1987 [B11].
1 The numbers in brackets correspond to those bibliographical items listed in annex C.
— Defines terminology
— Describes general characteristics of fields
— Surveys operational principles of instrumentation
— Indicates methods of calibration
— Identifies significant sources of error
While field meter specifications are identified, frequencies and field levels that should be used for calibration purposes, and limits on measurement uncertainty are not recommended in this standard. Rather, it is left to standards that describe measurement protocols for different environments to indicate specific calibration points and uncertainty requirements.
NOTE—For example, IEEE Std 644-1994 [B15]1 limits the total uncertainty during calibrations of magnetic and electric field meters used in the vicinity of ac power lines to ±3%.
However, sources of uncertainty during calibration and measurements are identified and guidance is provided on how they should be combined to determine total measurement uncertainty.
Throughout this recommended practice, the words "magnetic flux density" and "magnetic field" will be considered synonymous. In regard to electric field measurements, this recommended practice considers electric field meters that only measure the unperturbed electric field strength at a point in space (i.e., the electric field prior to the introduction of the field meter) or on conducting surfaces. Measurement protocols are not provided. Protocols for measuring electric and magnetic fields near power lines and video display terminals are described in IEEE Std 644-1994 [B15] and IEEE Std 1140-1994 [B16], respectively. Protocols for measuring only power frequency electric fields are described in IEC Publication 833 1987 [B11].
1 The numbers in brackets correspond to those bibliographical items listed in annex C.