Remember at time testing at a manufacturing location down south. Don't
know if it was humidity but we were the first to know that a rain storm was
headed our way. There was a dramatic change in the ESD discharge and response
characteristics before and during the downpour. Same for a
Dear Group,
In dry conditions, not only the charging processes are enhancec, but the
severity (less risetime, higher peak current) is enhanced in general. For both
reasons, it is not uncommen to see ESD problems move around the world with the
local seasons.
Still, I would always try to debug
Fred, et al
Vic's original question asked about test conditions; and that is what the
responses dealt with. As a matter of fact, the responses were very focused on
the question that was asked.
In the original question, I saw no discussion of the desired compliance level.
For all I know,
Vic:
The ambient relative humidity should have no impact on the performance of the
gut but only on the generation of static charges. So, to improve the
performance in the field, I would suggest that you increase the R.H. at the
customer site(s) to about 50% which would eliminate the generation
It is interesting to see how easy it is to lose focus. The problem is not the
humidity, approach speed, etc. as Richard has suggested. Yes, they are factors
but not the problem. The problem is a massive design flaw. 800 volts is way
too low. The fact there are multiple failure modes
As has been pointed out by Mr. Woods, humidity is only
one of many parameters involved with ESD. And simulating
a dry environment in a chamber that's completely lined with
metal surfaces might not be sufficient for simulating a dry
customer environment.
ESD failures at differing levels of
David,
I would add my voice to the notes below. In particular it was for
keyboards, and we tested at discrete steps. 2, 4, 6, 8, and then jumped in 4K
increments to 12, and 16 - occasionally to 20K for a specific customer
requirement. HP for example.
We too noted
Hi All,
Does anyone know what IEC 48D (Secretariat) 76 would be? It is called out
in the IEEE 1386:2001 standard for CMC cards as shock and vibration
requirements. I assumed that IEC 48D was a standard but apparently that is
not the case. SC 48D is a Subcommittee dealing with Mechanical
All
I have a number of questions concerning specification of mains filters:
The first is can somebody explain what CISPR 17 is and how it is
used to produce response curves for filters?
Secondly, manufacturers data for filter response curves refer to
50ohm - 50ohm measurements
Vic,
I agree, your product is probably seeing field failures because of the dry
conditions. These dry conditions make the probability of an ESD event higher.
This is due to the fact that, as personnel walk across carpets or rub their
clothing on chairs, there is no humidity in the air to
Humidity is not the only variable, and may not be your major variable.
Repeatability of ESD results is a statistical problem. Consider the
variables:
-humidity
-approach speed (for non-contact discharge)
-angle of the probe (for non-contact discharge)
-synchronization of the ESD application with
Hello Chris,
Try Kabelverk Eupen AG http://www.eupen.com/
They have a number of types, the site is down for the moment but try later.
Best regards
Helge Knudsen
Test Approval manager
Niros Telecommunication
Hirsemarken 5
DK-3520 Farum
Denmark
Tel +45 44 34 22 51
Fax +45 44 99 28 08
email
Dear Group
I tried to find David Pommerenke article's in the Journal of ESD on the Web
but alas no downloadable version was found, so may I ask the group a
question?
We have an ESD field failure which is occurring in dry hot countries ( no
surprise )which can be recreated with an ESD of
No but there have been several companies in the UK that were closed down by
Enforcement Offices until they corrected Safety and EMC defects that they
were discovered. Another company voluntarily ceased production for 6v months
whilst tooling was modified.
Best regards
Gregg
Gregg Kervill
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