Products > Test Equipment
Fixture to safely measure mains AC amperage
fazalmajid:
I was planning on using a fan next, but you're right, I have no idea how to extrapolate for non-resistive loads. Those devices do measure and report on the power factor, though, so I am hopeful.
bdunham7:
--- Quote from: fazalmajid on June 07, 2022, 09:35:35 pm ---I was planning on using a fan next, but you're right, I have no idea how to extrapolate for non-resistive loads. Those devices do measure and report on the power factor, though, so I am hopeful.
--- End quote ---
Then you might want to consider an actual power meter. I don't know the BW of a KillAWatt, but apparently the 121GW multimeter is ~1kHz. Perhaps that is good enough after all, at least at the accuracies you are probably after. Recombining separate current and voltage readings to obtain power is harder that it looks as you have to account for both BW and time skew.
fazalmajid:
I've ordered an Olson PMBox power meter. I'd still like to verify on a resistive load.
bicycleguy:
--- Quote from: bdunham7 on June 06, 2022, 10:21:36 pm ---Yes, power is different, but the EEVBlog 121GW and the P3 KillAWatt, among others, can manage at a reasonable price. And there's obviously more than phase shift to worry about as even linear PSUs with transformers can get very spiky. But the OP asked about current.
--- End quote ---
The 121GW can only handle 50V AC or DC max in VA mode. Many complaints during the kickstarter. The fix was a very ambiguous note in the specifications, note 11, 500VA, with 50V and 10A.
bdunham7:
--- Quote from: bicycleguy on June 08, 2022, 03:46:20 am ---The 121GW can only handle 50V AC or DC max in VA mode. Many complaints during the kickstarter. The fix was a very ambiguous note in the specifications, note 11, 500VA, with 50V and 10A.
--- End quote ---
Oops! I'm glad nobody took my advice, or at least AFAIK...I wonder why?
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