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| 121GW Power (VA) measurement shows "overflow" |
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| tnt:
Hi, I'm trying to measure power in AC mode with the 121GW for a mains connected device. But the 121GW just display "overflow" ... but it's only 240V AC, and ~ 100 mA, it should handle both of those with no issues right ? The way it's wired ATM I have : COM going to neutral A jack going to the "neutral" input of the DUT V jack going to live and also the "live" input of the DUT. What am I missing here ? |
| joeqsmith:
The last manual I downloaded wasn't very good at explaining the VA mode. I don't remember it being designed to measure AC line devices like you are attempting to do. I thought the AC voltage was limited to 50-60 or so was all. There was also a problem with how they suggested the meter be connected. This owner walks you through the problem. Then again, it has been a few years since I looked at this meter. There may be all new firmware and manuals that improve it. |
| joeqsmith:
Trying it with 2.02 firmware on what ever flavor of the hardware (not current) that I purchased to review. Shorting the current input to common and injecting a 60Hz sinewave, it over ranges at about 53V. So I don't think it's going to do what you want. |
| J-R:
This issue stems from the fact that the secondary display will only count up to 54.999 in VA modes, so specifically you are limited to a maximum of 54.999V (AC & DC). You could use multiple 121GW units and the math mode in the app. Also, at 240VAC, I would think you could calculate power well enough by just measuring current. |
| joeqsmith:
--- Quote from: J-R on July 14, 2022, 05:16:39 am ---... the secondary display will only count up to 54.999 in VA modes.... --- End quote --- Why? They have the decimal point. Hardware could certainly scale it. Was it for safety reasons? |
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