Thanks for the detailed analysis.
adafruit_support wrote:I'll check one out on the bench and see if it performs similarly.
Not sure that I would consider a $10 panel meter to be in a class comparable to a Tek DMM though.
adafruit_support wrote:I tested with power from the circuit as well as with separate power for the meter supply. The results were similar. Meter power draw ranged from about 11-24 mA depending on voltage and how many segments were lit. The variability due to display means that the 24mA constant in your error calculations is not quite valid and the actual discrepancy is likely smaller. I found it to be generally within about 3% of my supply.
Even using your calculated calculated error
At 1.71A (indicated) was less than 1% (0.014)
And at 1.92A (indicated) it was just over 3%.
All-in-all, not bad for a $10 meter.
adafruit wrote:Hi there, the 3-4mA measurement was a mixup copy&paste from the mini panel meter (those are much simpler/tinier and use less current) ...
adafruit wrote:this is a mini panel meter, as you can see its much smaller
the copy we write for all our products is original, so if you see anyone else using suspiciously-similar text (and including our typos) then you can be pretty sure all these other shops just copy & pasted our text without reading or even checking its the same product
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