Let’s examine the results of tests on one of these instruments to show the levels of accuracy available: in some cases at least 15 times better than the uncertainty requirements of the international standby standards. High-precision power meters and analyzers are now available with standby power consumption measurement software that complies with all the stringent conditions, testing methods and resolution of the test instruments specified in the IEC 62301 Ed.2.0 and EN50564:2011 standards. Standby power measurement is a challenge because most power meters on the market today do not have the accuracy to measure low power values accurately - especially at high crest factors and low power factors. For more than a decade, energy consumption in low-power and standby modes has been recognized as an important issue.
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