Products > Test Equipment
121GW Power (VA) measurement shows "overflow"
(1/2) > >>
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? 
Navigation
Message Index
Next page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod