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(Suggestion on) Testing power amplifiers according to IEC 60268-3 standard

restorer-john

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@pma

There's a new version (early access) of Picoscope T&M version 7. Quite different. Check it out.

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pma

pma

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Measurement of burst power, 20kHz sine burst, A250W4R class AB amplifier, load 4ohm//2.2uF, 2.68 ohm modulus at 20kHz and phase angle -48°. Power = 297W/4ohm, but 443W/2.68ohm.

A250W4R_burst20kHz_4R+2.2uF_sm.png


The burst is digitally generated by Topping D10s at Fs=96kHz, thus the ringing at the beginning and at the end of the burst. Please also note the sharp cut of spectrum above DAC Fs/2 (48kHz).

More here.
 
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