Bit of a note re static. There is more to behaving properly than you might
think.
-The IC tubes known as 'antistatic' were just coated so that the triboelectric
effect was less. Those tubes were not protection against local static
discharges.
- read up on Faraday shielding. And the conductive and sealable bags/tubes.
- And the requirement for earthing/grounding parts and people properly.
- The common 'earth it or ground it ' practice causes dangerous situations.
Especially when not current limited..
Consider this experiment.
Earthing something and then moving it should be safe - right?
Set up a simple electrophorus. eg a chargeable surface and a metal disk on an
insulating handle.
Charge the surface, bring the disk near it and then momentarily earth the disk.
That disk is discharged and at earth potential, right? Momentarily earth it
again to check - no spark.
Now move the disk away. Maybe bring it up to the end of your nose. Won't get a
spark off it will you? Or will you?
Of course you will. The momentary earth was applied while the disk was in a
strong electric field ['electrons' were pushed out of it or sucked into it].
I used to use that demonstration to get the bench techs to rethink their static
procedures. The majority of techs guess that the disk stays 'discharged'.
I have mentioned only a tiny part of the topic of course. 'We' also used to
have failures during wave soldering and the board handling before and after it
too.
I built a small electroscope out of a coffee jar, tin lid and some thin
conductive 'antistatic' plastic bag. I used that to demonstrate charged people
and areas. Wasn't as sensitive as the electronic device procured from the '
static protection ' company BUT it had a much better influence on the workers.
They could SEE the plastic move when it was charged.
Protecting static sensitive components during all the phases of their
association with you is not as easy as you might think.
Probably the low failure rate is due to their actual robustness and not your
procedures. But, by that, I don't mean stop being careful.
Note: when static is misunderstood though, some so-called intuitive procedures
are making the situation worse. The guys who didn't guess right about the
electrophorous can't be trusted to handle parts correctly. eg What if they did
all the 'right' things and then when the job was finished they removed their
earths/grounds etc whilst the product was actually in some degree of electric
field. The product [or insulated conductive parts of it] is the 'disk' of the
electrophorus
The above is just a nudge to read up on it; I am not an expert.
John Kaesehagen
Australia
----- Original Message -----
From: Edward Van Belkom
To: neonixie-l
Sent: Tuesday, August 29, 2017 2:56 AM
Subject: [neonixie-l] Re: PV Electronics R568 Clock Project With Black
R|Z568M Nixie Tubes
How about add a piece of antistatic foam to the bottom of the foam?
On Monday, August 28, 2017 at 12:18:00 PM UTC-5, gregebert wrote:
Be careful with any plastic contraptions; they can create ESD problems. As
long as no ESD-sensitive parts are on the board during handling, no worries.
If you do have ESD-sensitive parts, it's probably best to mount them last.
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