IEC 62087-1-2015 pdf free download.Audio, video, and related equipment – Determination of power consumption – Part 1: General. 5.1.3 Adjustment of controls The controls not specifically mentioned in this part or other parts of IEC 62087 shall be in the position adjusted by the manufacturer for shipment to the end user. These controls shall remain in this state for the duration of the test unless otherwise directed. 5.1.4 Input signals For equipment for which the input signals are not explicitly described in this standard, the signals as specified by the manufacturer shall be applied during the test. The input signals used shall be reported. 5.1.5 Power measuring instrument The measurement shall be carried out directly by means of a wattmeter, a wattmeter with averaging function, or a watthour meter by dividing the reading by the measuring time. If the power consumption is expected to vary over time, such as in the case of a television set displaying a dynamic signal, a watthour meter or a wattmeter with an averaging function shall be used to carry out the measurement. The sampling rate of the watthour meter or wattmeter with averaging function shall be high enough to achieve an accurate measurement. The manufacturer’s specification shall be used to determine the appropriateness of the meter and suitable sampling rates to perform a measurement with the required accuracy. The power measuring instrument used shall measure the real power consumed regardless of the power factor of the UUT. In the case of Partial On mode power measurement, it should be ascertained that the wattmeter or the watthour meter is suitable to measure the power consumption of power supplies working in a burst mode with a low duty cycle and the low power consumption levels in the Partial On mode. For digital power meters a sampling rate of at least 10 kHz is recommended. (Sampling rate in many specifications refers to how often the display is updated, and not the actual sampling frequency of the input waveform.) Most digital power meters are believed to meet this requirement. If it is not listed in the manufacturer’s specifications, contact the manufacturer. 5.1.6 Measurement uncertainty Measurements of power of 0,5 W or greater shall be made with an uncertainty of less than or equal to 2 % at the 95 % confidence level. Measurements of power of less than 0,5 W shall be made with an uncertainty of less...
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