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Question: What is the error % in reading the voltage of a Square wave (1 Vpp) with an average-sensing multimeter with a half-wave rectifier, compared to a TRms multimeter

The answer seems to be 11.1% (the same for a full-wave rectifier which I get) but i'm struggling with a 21.5% for half-wave

Assuming: AS multimeter reads and multiplies the mean value of the half-wave-rectified square wave with the form factor that only applies to sinusoidal currents. So 0.25 * 1.5708 = 0.3927. Comparing this with the actual Vrms of the wave (0.5) I get (0.39 - 0.5)/0.5 * 100 = -21.46%

What am I doing wrong?

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