| Products > Test Equipment |
| Shannon ST42 LCR Tweezer Test and Comparison Thread |
| << < (9/28) > >> |
| 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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