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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Electricity and Magnetism for United Kingdom (.PDF file)
AC voltage up to 1100 V: meters. Mains frequency harmonics analyser, flicker meter, wattmeter, 1 V to 1000 V
Relative expanded uncertainty (k = 2, level of confidence 95 %) in µV/V: 25
Digital sampling
Frequency: single tone sinewave 50 Hz to 2 kHz
Approved on 06 August 2013
Internal NMI service identifier: 309,5