SI Digital Framework
CLASSIFICATION OF SERVICES
Version: 1.0 Beta , last update: 2025-02-10
Metrology Area: Electricity and Magnetism KCDB ↗
TTL file : EM.ttl
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CURRENTLY ASSIGNED

EM/DC DC voltage, current, and resistance

EM/DC-1 DC voltage (up to 1100 V)
EM/DC-1.1 DC voltage sources
EM/DC-1.1.1 Single values
EM/DC-1.1.2 Low values (below or equal to 10 V)
EM/DC-1.1.3 Intermediate values (from above 10 V up to 1100 V)
EM/DC-1.1.4 Noise voltages
EM/DC-1.2 DC voltage meters
EM/DC-1.2.1 Very low values (below or equal to 1 mV)
EM/DC-1.2.2 Intermediate values (from above 1 mV up to 1100 V)
EM/DC-1.3 DC voltage ratios
EM/DC-1.3.1 Up to 1100 V
EM/DC-1.3.2 Attenuation
EM/DC-2 DC resistance
EM/DC-2.1 DC resistance standards and sources
EM/DC-2.1.1 Low values (below or equal to 1 ohm)
EM/DC-2.1.2 Intermediate values (from above 1 ohm up to 1 megaohm)
EM/DC-2.1.3 High values (above 1 megaohm)
EM/DC-2.1.4 Standards for high current
EM/DC-2.1.5 Multiple ranges
EM/DC-2.1.6 Temperature, power and pressure coefficients
EM/DC-2.2 DC resistance meters
EM/DC-2.2.1 Low values (<= 1 ohm)
EM/DC-2.2.2 Intermediate values (from above 1 ohm up to 1 gigaohm)
EM/DC-2.2.3 High values (above 1 gigaohm)
EM/DC-2.3 DC resistance ratios
EM/DC-2.3.1 DC resistance ratios
EM/DC-3 DC current (up to 100 A)
EM/DC-3.1 DC current sources
EM/DC-3.1.1 Low values (below 0.1 mA)
EM/DC-3.1.2 Intermediate values (from above 0.1 mA to 20 A)
EM/DC-3.1.3 High values (from above 20 A up to 100 A)
EM/DC-3.1.4 Transconductance ratio
EM/DC-3.1.5 Noise currents
EM/DC-3.2 DC current meters
EM/DC-3.2.1 Low values (below or equal to 0.1 mA)
EM/DC-3.2.2 Intermediate values (from above 0.1 mA to 20 A)
EM/DC-3.2.3 High values (from above 20 A up to 100 A)
EM/DC-3.3 DC current ratios
EM/DC-3.3.1 Ratios up to 100 A

EM/Imped Impedance up to the MHz range

EM/Imped-4 Impedance (up to the MHz range)
EM/Imped-4.1 AC resistance
EM/Imped-4.1.1 Real component and imaginary component
EM/Imped-4.1.2 AC-DC difference
EM/Imped-4.1.3 Resistors for high current
EM/Imped-4.1.4 Meters
EM/Imped-4.1.5 AC resistance ratios
EM/Imped-4.2 Capacitance
EM/Imped-4.2.1 Capacitance and dissipation factor for low loss capacitors
EM/Imped-4.2.2 Capacitance and dissipation factor for dielectric capacitors
EM/Imped-4.2.3 Capacitance and dissipation factor for transformed capacitors
EM/Imped-4.2.4 Meters
EM/Imped-4.3 Inductance
EM/Imped-4.3.1 Self inductance, low values (below 1 mH)
EM/Imped-4.3.2 Self inductance, intermediate values (from 1 mH up to 1 H)
EM/Imped-4.3.3 Self inductance, high values (above 1 H)
EM/Imped-4.3.4 Mutual inductance
EM/Imped-4.3.5 Meters
EM/Imped-4.3.6 Quality factor

EM/AC AC voltage, current, and power

EM/AC-5 AC voltage (up to the MHz range)
EM/AC-5.1 AC-DC voltage transfer
EM/AC-5.1.1 AC-DC transfer difference at low voltages (<= 0.5 V)
EM/AC-5.1.2 AC-DC transfer difference at medium voltages (0.5 V to 5 V)
EM/AC-5.1.3 AC-DC transfer difference at higher voltages (> 5 V)
EM/AC-5.2 AC voltage up to 1100 V
EM/AC-5.2.1 Sources
EM/AC-5.2.2 Meters
EM/AC-5.3 AC voltage ratio up to 1100 V, atten & gain
EM/AC-5.3.1 Real component and imaginary component
EM/AC-5.3.2 Attenuation and gain
EM/AC-6 AC current
EM/AC-6.1 AC-DC current transfer
EM/AC-6.1.1 AC-DC transfer difference
EM/AC-6.2 AC current up to 100 A
EM/AC-6.2.1 Sources
EM/AC-6.2.2 Meters
EM/AC-6.3 AC current ratio up to 100 A
EM/AC-6.3.1 Real component and imaginary component
EM/AC-7 AC power
EM/AC-7.1 AC power and energy
EM/AC-7.1.1 Single phase power at frequencies <= 400 Hz
EM/AC-7.1.2 Single phase power at frequencies > 400 Hz
EM/AC-7.1.3 Three phase

EM/HV High voltage and current

EM/HV-8 High voltage and current
EM/HV-8.1 High DC voltage
EM/HV-8.1.1 High voltage sources
EM/HV-8.1.2 High voltage meters
EM/HV-8.1.3 Ratios
EM/HV-8.1.4 Average value of DC voltage
EM/HV-8.1.5 RMS value of DC voltage ripple
EM/HV-8.2 High voltage impedance
EM/HV-8.2.1 Capacitance and dissipation factor
EM/HV-8.2.2 Inductance and loss angle
EM/HV-8.2.4 Resistance
EM/HV-8.3 AC high voltage and voltage transformers
EM/HV-8.3.1 Sources
EM/HV-8.3.2 Meters
EM/HV-8.3.3 Peak values of high AC voltage
EM/HV-8.3.4 Voltage transformers: ratio error and phase displacement
EM/HV-8.3.5 RMS value for high AC voltage
EM/HV-8.3.6 Rectified average value of high AC voltage
EM/HV-8.4 Pulsed high voltage and current
EM/HV-8.4.2 Lightning impulse time parameters
EM/HV-8.4.4 Switching impulse time parameters
EM/HV-8.4.5 Parameters for impulse current (see list in the bottom of KCDB home page)
EM/HV-8.4.6 Impulse current time parameters
EM/HV-8.4.7 Impulse energy
EM/HV-8.4.8 Response parameters: response time, overshoot, settling time
EM/HV-8.5 Electric discharge
EM/HV-8.5.1 Apparent charge
EM/HV-8.5.2 Response
EM/HV-8.5.3 Rise time of partial discharge pulse
EM/HV-8.6 High AC current and current transformers
EM/HV-8.6.1 Sources
EM/HV-8.6.2 Meters
EM/HV-8.6.3 Current transformers: ratio error and phase displacement
EM/HV-8.6.4 Pulsating current
EM/HV-8.6.5 High AC current RMS value
EM/HV-8.6.6 Other AC current parameters (see list in the bottom of KCDB home page)
EM/HV-8.7 High DC current
EM/HV-8.7.1 Sources
EM/HV-8.7.2 Meters
EM/HV-8.7.3 High DC current ratio
EM/HV-8.7.4 High DC current average value

EM/OtherDC Other DC and low frequency measurements

EM/OtherDC-9 Other DC and low frequency measurements
EM/OtherDC-9.1 Electric charge
EM/OtherDC-9.1.1 Sources
EM/OtherDC-9.1.2 Meters
EM/OtherDC-9.2 Phase angle
EM/OtherDC-9.2.1 Sources
EM/OtherDC-9.2.2 Meters
EM/OtherDC-9.2.3 Phase shift
EM/OtherDC-9.3 Current and voltage waveform
EM/OtherDC-9.3.1 Main frequency harmonics
EM/OtherDC-9.3.2 Mains frequency harmonic distorsion
EM/OtherDC-9.3.3 Non sinusoidal waveforms, harmonic meas. for current waveforms, steady state
EM/OtherDC-9.3.6 Flicker severity (Pst), complex modulation
EM/OtherDC-9.3.7 Mains frequency interharmonics

EM/Field Electric and magnetic fields

EM/Field-10 Electric and magnetic fields
EM/Field-10.1 Electric fields at freq. below 50 kHz
EM/Field-10.1.1 Electrostatic field strength
EM/Field-10.1.2 Electric field strength
EM/Field-10.2 Magnetic fields at freq. below 50 kHz
EM/Field-10.2.1 Magnetic flux
EM/Field-10.2.2 DC magnetic flux density and applied magnetic field strength
EM/Field-10.2.3 AC magnetic flux density and applied magnetic field strength
EM/Field-10.2.4 DC shielding factor (ratio of DC magnetic flux density)
EM/Field-10.2.5 AC shielding factor (ratio of AC magnetic flux density)
EM/Field-10.2.6 Turn area (ratio of magnetic flux and magnetic flux density)
EM/Field-10.2.7 Magnetic flux density or magnetic field strength per unit current
EM/Field-10.2.8 Magnetic field gradient
EM/Field-10.3 Electromagnetic fields at freq. above 50 kHz
EM/Field-10.3.1 Electric field strength
EM/Field-10.3.2 Magnetic field strength
EM/Field-10.3.3 Power flux density
EM/Field-10.3.4 Magnetic flux density
EM/Field-10.3.5 Magnetic field strength per unit current
EM/Field-10.3.6 Turn area (ratio of magnetic flux and magnetic flux density)

EM/RF Radio frequency measurements

EM/RF-11 Radio frequency measurements
EM/RF-11.1 RF power
EM/RF-11.1.1 Absolute power in coaxial line
EM/RF-11.1.2 Absolute power in waveguide
EM/RF-11.1.3 Calibration factor and effective efficiency in coaxial line
EM/RF-11.1.4 Calibration factor and effective efficiency in waveguide
EM/RF-11.1.5 Non-CW power (absolute or relative)
EM/RF-11.1.6 Power measurements in balanced lines
EM/RF-11.2 Scalar RF reflection coef. and attenuation
EM/RF-11.2.1 Reflection coefficient in coaxial line (values in linear terms)
EM/RF-11.2.2 Reflection coefficient in waveguide (values in linear terms)
EM/RF-11.2.3 Attenuation in coaxial line (values in dB)
EM/RF-11.2.4 Attenuation in waveguide (values in dB)
EM/RF-11.2.5 Directivity, effective source match
EM/RF-11.2.6 Reflection and attenuation measurements in balanced lines
EM/RF-11.3 Scattering parameters (vectors)
EM/RF-11.3.1 Reflection coefficient in coaxial line (real and imaginary)
EM/RF-11.3.2 Reflection coefficient in waveguide (real and imaginary)
EM/RF-11.3.3 Transmission coefficient in coaxial line (real and imaginary)
EM/RF-11.3.4 Transmission coefficient in waveguide (real and imaginary)
EM/RF-11.3.5 Directivity, effective source match
EM/RF-11.3.6 Reflection coefficient for common mode systems
EM/RF-11.3.7 Transmission coefficient for common mode systems
EM/RF-11.3.8 Reflection coefficient (Sii) in planar line systems
EM/RF-11.3.9 Transmission coefficient (Sij) in planar line systems
EM/RF-11.4 Noise
EM/RF-11.4.1 Noise temperature or excess noise ratio in coaxial line
EM/RF-11.4.2 Noise temperature or excess noise ratio in waveguide
EM/RF-11.4.3 Amplifier noise parameters
EM/RF-11.4.4 Phase noise
EM/RF-11.4.5 Radio brightness temperature, spectral radiance in free space
EM/RF-11.5 Antenna properties
EM/RF-11.5.1 Antenna factor
EM/RF-11.5.2 Antenna gain
EM/RF-11.5.3 Other properties (pattern, beam width, …)
EM/RF-11.6 Signal and pulse characteristics
EM/RF-11.6.1 Pulse amplitude
EM/RF-11.6.2 Pulse time parameters
EM/RF-11.6.3 Modulation, AM and FM
EM/RF-11.6.4 Distorsion and harmonic content
EM/RF-11.7 RF voltage and current
EM/RF-11.7.1 RF-DC difference
EM/RF-11.7.2 RF voltage sources
EM/RF-11.7.3 RF voltage meters
EM/RF-11.7.4 RF current
EM/RF-11.7.5 RF transfer impedance
EM/RF-11.7.6 RF voltage division factor
EM/RF-11.7.7 RF coupling factor
EM/RF-11.7.8 Flatness of RF voltage sources
EM/RF-11.7.9 Flatness of RF voltage meters
EM/RF-11.8 Lumped impedance - admittance
EM/RF-11.8.1 Resistance or conductance
EM/RF-11.8.2 Inductance
EM/RF-11.8.3 Capacitance
EM/RF-11.8.4 Quality factor
EM/RF-11.9 RF characteristic impedance
EM/RF-11.9.1 Mechanical dimensions
EM/RF-11.9.2 Electrical parameters

EM/Mater Materials

EM/Mater-12 Measurements on materials
EM/Mater-12.1 Electrical conductivity
EM/Mater-12.1.1 Metallic materials
EM/Mater-12.1.2 Liquids
EM/Mater-12.1.3 Semiconducting and similar materials
EM/Mater-12.2 Dielectric properties
EM/Mater-12.2.1 Relative permittivity: real and - or imaginary part
EM/Mater-12.2.2 Dielectric loss tangent
EM/Mater-12.3 Soft magnetic sheet and powder materials
EM/Mater-12.3.1 Specific total power loss
EM/Mater-12.3.2 Peak value of DC magnetic polarisation
EM/Mater-12.3.3 Peak value of AC magnetic polarisation
EM/Mater-12.3.4 Peak value of magnetic field strength
EM/Mater-12.3.5 RMS value of magnetic field strength
EM/Mater-12.3.6 Specific apparent power
EM/Mater-12.3.7 Relative peak permeability
EM/Mater-12.3.8 Complex relative permeability
EM/Mater-12.3.9 Density
EM/Mater-12.3.10 Resistivity
EM/Mater-12.4 Soft magnetic bulk material
EM/Mater-12.4.1 Magnetic polarisation
EM/Mater-12.4.2 Magnetic field strength
EM/Mater-12.4.3 Remanent magnetic flux density
EM/Mater-12.4.4 Coercive magnetic field strength
EM/Mater-12.4.5 Magnetic saturation polarisation
EM/Mater-12.4.6 Relative permeability
EM/Mater-12.5 Feebly magnetic, paramagnetic and diamagnetic material
EM/Mater-12.5.1 DC magnetic susceptibility or relative magnetic permeability
EM/Mater-12.6 Hard magnetic material
EM/Mater-12.6.1 Remanent magnetic flux density
EM/Mater-12.6.2 Coercive field strength
EM/Mater-12.6.3 Maximum energy product
EM/Mater-12.6.4 Magnetic moment
EM/Mater-12.6.5 Magnetic flux density
EM/Mater-12.6.6 Magnetic polarisation
EM/Mater-12.6.7 Relative recoil permeability
EM/Mater-12.7 Magnetic data storage media
EM/Mater-12.7.1 Signal amplitude of magnetic stripes
EM/Mater-12.7.2 Surface profile of magnetic stripes
EM/Mater-12.7.3 Reference field of diskettes
EM/Mater-12.7.4 Signal amplitude of diskettes
EM/Mater-12.7.5 Resolution of diskettes
EM/Mater-12.7.6 Peak shift of diskettes
EM/Mater-12.7.7 Overwrite of diskettes
EM/Mater-12.7.8 Video and audio tapes