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INN3679C_No Load input power measurement

Posted by: IKastantin on

Hi all,

how can I measure the no load input power at different input values?

I have no stable reading for this. please find attached the drai-source signal @ no load.

in your design report for DER-747 you put these values (p. 32).

BR, Imad

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Submitted by PI-Wrench on 02/09/2022

Due to burst mode, the reading on a wattmeter set normally will fluctuate and give you varied results for no-load input power. To get around this, you will need to have a wattmeter that has a watt-hour function in order to integrate the fluctuating input power and average it out. At PI, we use the Yokogawa WT210 or WT310E  to measure no-load power. To get the most accurate low power readings, you will need to  arrange the test leads so that the AC voltage is measured ahead of the current shunt. Set the integrator to "Off" and set up the measurement time to 10-15 minutes. You will need to multiply integrated reading by 1/the fraction of an hour you are using to measure. For 10min, this would be X6, for 15 min, X4, for 20 min, X3, for 60 min, X1.