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Kendal
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Posted: ‎2022-12-13 05:46 AM . Last Modified: ‎2022-12-13 05:49 AM

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‎2022-12-13 05:46 AM

ATHDF% or THDFi or current THD

Hi,

 

Can someone explain to me how bad this figure is for ATHDF%...using a Tektronix power meter PA1000 to characterise a power adapter 230VAC to 5Vdc. The power adapter has a rating of 5V output, max 1A. When loaded at max 1A, the power meter provides a power factor reading of 0.427 and ATHDF% of 154. I'm having difficulty interpreting 154 for THDF(current). 154% looks bad but is it normal for these cheap type switching PSUs? At 25% load or 250mA the reading increases to 163%.

 

Thanks

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DanL
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Posted: ‎2022-12-13 02:27 PM

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‎2022-12-13 02:27 PM

I'm not familiar with the term "ATHDF%" nor the "Tektronix power meter PA1000", but if I had to guess this is the "Amps Total Harmonic Distortion as a % of Fundamental".
Yes, >100% current distortion as a % of fundamental is very typical for all switch-mode power supplies without active PFC. Normally for most loads <50W, load current THD is not a concern.

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DanL
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Posted: ‎2022-12-13 02:27 PM

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‎2022-12-13 02:27 PM

I'm not familiar with the term "ATHDF%" nor the "Tektronix power meter PA1000", but if I had to guess this is the "Amps Total Harmonic Distortion as a % of Fundamental".
Yes, >100% current distortion as a % of fundamental is very typical for all switch-mode power supplies without active PFC. Normally for most loads <50W, load current THD is not a concern.

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Kendal
Kendal
Cadet

Posted: ‎2022-12-14 02:09 AM

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‎2022-12-14 02:09 AM

Great, thanks for the reply. Yes, your guess of the acronym ATHDF% is correct.

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