It seems that - as you'd expect - the off-brand ones put out the most noise.
I haven't revisited this? in a while.? I'll have to grab some newer LED incandescent? replacements and see if they've gotten better.? I do a lot of High Power LED PCB's for a local client and since they're for mil and marine we test them to various standards - MIL-STD-461, Part 15.109 and some Part 18...
My lab:
I just do pre qual... they have to take the stuff to a real EMI lab or something like PAX ASIL -
Spent lots of time there...
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On 12/8/2024 6:46 PM, mike allen via groups.io wrote:
??? DO ya recall which light put out the most noise ?
thanks
??? animal
On 12/8/24 10:42 AM, WAM via groups.io wrote:
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.
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
