My son has a new welder, spec'd 5% max THD input AC power. I see Keysight has a DMM with a "relative distortion" position. Anyone used one of these? Useful? Anyone have a favorite, or a simple method? Cheers
- posted
2 years ago
Field measurement of harmonic distortion- how?
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- posted
2 years ago
Wond wrote: =============
** The welder is clearly not happy with power from a "modified square wave" DC inverter. So don't use one.Regular mains power is gonna be fine.
..... Phil
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- posted
2 years ago
My thinking too, but it appears from available bumf that inverter types claim less THD than cheap conventional gens. It would be interesting to see how Agilent/Keysight measure it in their DMM. Thanks for reply.
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- posted
2 years ago
Wond wrote: ==============
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** Oh dear - FYI a "DC inverter " runs off a 12 or 24V battery." Inverter generators " are pure sine wave. The AC supply has a few percent of 3rd and 5th harmonics.
** For sure. I saw nothing on the Agilent site about it.Can you borrow a scope to take a peek at the wave?
.... Phil