Interesting vid I did years ago showing the effect of a CFL light bulb (the curly fluorescent ones before LED replacements) and the EMI interference it causes on a plastic caliper
LED lamps can be just as bad.? The SMPS supplies can put out quite an amount if EMI:
Again - from years ago:
that's a TEK 1.8GHz analog spectrum analyzer
If you take something like an RF Explorer or one of those cheap CN-made spectrum analyzers into a place like LOWE's or Home Depot's out motion activated light aisle, watch the RF jump from about 1- 200 MHz...?? nasty.
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On 12/8/2024 1:16 PM, Charles Kinzer via groups.io wrote:
I am more likely to suspect the calipers than interference.? Especially if they are the extremely inexpensive ones.
But it would be easy enough to drive the calipers a distance away from any electrical transmission source and see if they magically start working.
I have some of the low-cost digital calipers and mine have a tendency to skip sometimes and suddenly be 0.2 or 0.4 inches off or something) and also
I finally bought two Mitutoyo digital calipers, 4 inch and 6 inches.? NO problems - ever.? Yes, they cost a bit.? In the long run, I think a better value.? I also have some dial calipers I sometimes use.
And just to be pedantic, if it is a digital caliper, then it is not a vernier.? Those are two types of calipers.? One has a digital scale.? The other a vernier (where you line up physical marks to read accurately).? Although many people still include the word "vernier" even if it doesn't fit - even listings for sale.? You have vernier, dial, and digital.
Charles E. "Chuck" Kinzer
On Sunday, December 8, 2024 at 09:57:25 AM PST, Johannes <johannes@...> wrote:
#yiv3669264674 P {margin-top:0;margin-bottom:0;}I can not work without many "Digital Electronic Vernier Caliper" in my workshop.However, they are always hiding them self when I am doing my job.Lately I have discovered that they are missing the numbers on the display.Both old and new ones.Suddenly the numbers are being negative or shutting down.I am blaming a Comunicacion tower not far?from the building.
Someone's that has a good advice for me?
Best fromJohannes
