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CMCs General Physics (50)
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Radio frequency measurements (50)
Antenna properties: antenna factor (15)
Signal and pulse characteristics: pulse time parameters: risetime (5)
Antenna properties: antenna gain (4)
Scalar RF attenuation and gain: on coaxials (4)
Scalar RF attenuation and gain: on waveguides (4)
Signal and pulse characteristics: pulse amplitude (2)
Scattering parameters: reflection coefficient (Sii) on coaxials, real and imaginary (2)
Signal and pulse characteristics: pulse settling (2)
HF power: calibration factor on coaxials (2)
RF noise: noise temperature in waveguides (2)
Scattering parameters: reflection coefficient (Sii) on waveguides, real and imaginary (1)
Scattering parameters: transmission coefficient (Sij) on coaxials, real and imaginary (1)
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United Kingdom (50)
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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Electricity and Magnetism for United Kingdom (.PDF file)
RF characteristic impedance: electrical parameters. Reference air lines, 27.7 to 100.8
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in : 0.01 to 0.2
Air-gauge system
Fixed-value Impedance: 28 , 50 , 75 , 100
Connector type: 7-16, GR900, GPC-7, Type-N, 3.5 mm, 2.92 mm, 2.4 mm, 1.85 mm
The uncertainty is very dependent upon the quality of the air line under test. The minimum uncertainty stated here is for a line with minimal deviation from nominal.
Approved on 06 January 2015
Internal NMI service identifier: 557
Uncertainty table
 
Antenna properties: antenna factor. Active or passive shielded loop antenna, reference value for unit: -1m-1, -40 dB to 110 dB
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in dB: 1.5 at 100 Hz, 1.0 above
In TEM cell
Frequency range: 10 Hz to 40 MHz
Approved on 07 February 2019
Internal NMI service identifier: 559
 
HF power: calibration factor on coaxials. Power sensors / calorimeters, 1 mW to 10 mW
Relative expanded uncertainty (k = 2, level of confidence 95 %) in mW/W: 2 to 4
DC substitution
Frequency: 100 kHz to 8 GHz
Connector type: 14 mm
Approved on 06 August 2013
Internal NMI service identifier: 347
Uncertainty table
 
HF power: calibration factor on coaxials. Power sensors, 0.1 mW to 10 mW
Relative expanded uncertainty (k = 2, level of confidence 95 %) in mW/W: 2.5 to 50
DC or 50 MHz substitution
Frequency: 100 kHz to 50 GHz
Connector type: 7 mm (GPC 7 or Type N), 3.5, 2.4 mm
Approved on 06 August 2013
Internal NMI service identifier: 349
Uncertainty table
 
HF power: calibration factor on waveguides. Power sensors, 0.1 mW to 10 mW
Relative expanded uncertainty (k = 2, level of confidence 95 %) in mW/W: 4 to 16
Referenced to DC or 50 MHz
Frequency: 8.2 GHz to 110 GHz
Waveguide designation: R100, R140, R220, R320, R400, R620, R900
Approved on 06 August 2013
Internal NMI service identifier: 364
Uncertainty table
 
Signal and pulse characteristics: pulse amplitude. Pulse generator, 50 mV to 800 mV
Relative expanded uncertainty (k = 2, level of confidence 95 %) in mV/V: 3
Calibrated oscilloscope
Approved on 07 February 2019
Internal NMI service identifier: 472,1
 
Signal and pulse characteristics: pulse amplitude. Pulse generator, 800 mV to 1000 mV
Relative expanded uncertainty (k = 2, level of confidence 95 %) in mV/V: 5
Calibrated oscilloscope
Approved on 07 February 2019
Internal NMI service identifier: 472,7
 
RF noise: noise temperature in waveguides. Noise source, 77 K to 1E+07 K
Relative expanded uncertainty (k = 2, level of confidence 95 %) in mK/K: 10 to 22
Radiometer
Frequency: 18 GHz to 110 GHz
Waveguide designation: R220, R320, R400, R620, R900
Approved on 06 August 2013
Internal NMI service identifier: 435
Uncertainty table
 
RF noise: noise temperature in coaxials. Noise source, 77 K to 100000 K
Relative expanded uncertainty (k = 2, level of confidence 95 %) in mK/K: 11 to 25
Radiometer
Frequency: 10 MHz to 40 GHz
Connector type: GPC-7, 2.4 mm
Approved on 06 August 2013
Internal NMI service identifier: 428
Uncertainty table
 
RF noise: noise temperature in waveguides. Noise source, 600 K to 1000000 K
Relative expanded uncertainty (k = 2, level of confidence 95 %) in mK/K: 5.3 to 7.8
Radiometer
Frequency: 2.6 GHz to 18 GHz
Waveguide designation: R32, R70, R100, R140
Approved on 06 August 2013
Internal NMI service identifier: 431
Uncertainty table