Products > Test Equipment
Shannon ST42 LCR Tweezer Test and Comparison Thread
KungFuJosh:
I wonder how much of an effect aging has with these. My tweezers are over 2 years old. I'm looking forward to my new comparison this week.
Martin72:
If you want to know exactly, you would have to access the objects you measured 2 years ago with the tweezers and measure them again.
But you can start again now and then every 6 months....
The accuracy of the ST42 is not outstanding, rather worthy of the price, but in practice this should hardly play a role.
Even the 5.5% deviation at the smallest L value is hardly relevant in my opinion, even if it far exceeds the tolerance specified by the manufacturer.
KungFuJosh:
I was more referring to my measurements being closer to the bench LCR. Stuff should arrive today for the test PCB, we'll see how it all looks.
KungFuJosh:
I forgot how tedious these cal tests are. Here's a PDF with the results of the ST2832 and ST42. On the bright side, my estimates for calculating dissipation factor were pretty darn close.
I decided against making it take twice as long and including other meters. In the future, if I make a LCR test board that I really like, I'll get it calibrated and then do one test with all my LCR meters. I need to devise a better way to connect the kelvin clips, it's very picky about position.
EDIT: Corrected test voltages on PDF.
Martin72:
I have downloaded it and I have questions about it.... ;)
But late, now I'm too tired, time for bed. :=\
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