ESD level measurement

[Dummy]

Radio reset when ESD was applied to certain exposed conductive pins.
I would like to monitor the reset pin of the microcontroller using
oscilloscope, but worrying that ESD spike might damage the scope which
has 250V max rating. Is oscilloscope fast enough to capture ESD spike?
What equipments or test setup are needed in order to capture ESD
spike? Thanks.

 

[Tom Biasi]

"Dummy" <ahkit1021@yahoo.com> wrote in message
news:74bb84c0.0408122215.7c69218a@posting.google.com...

Radio reset when ESD was applied to certain exposed conductive pins.
I would like to monitor the reset pin of the microcontroller using
oscilloscope, but worrying that ESD spike might damage the scope which
has 250V max rating. Is oscilloscope fast enough to capture ESD spike?
What equipments or test setup are needed in order to capture ESD
spike? Thanks.
I would be worrying about the microcontroller. ESD discharges are very

unpredictable and get do much damage to sensitive equipment.
There are special test devices to study ESD. Do a Google for ESD test
devices and you will see what this involves.
Tom

 

[amnon]

Hi
I think the scope would be protected against ESD and that 250V are for
constant voltage and not a nSec spike.
A scope with 1Ghz BW will allow you to capture a nSec spike.
Use "Normal" mode at signal Negedge with threshold set to 1.5V.
How do you intend to produce the spike ?
Do you have the ESD "gun" ?
Amnon


"Dummy" <ahkit1021@yahoo.com> ???
??????:74bb84c0.0408122215.7c69218a@posting.google.com...

Radio reset when ESD was applied to certain exposed conductive pins.
I would like to monitor the reset pin of the microcontroller using
oscilloscope, but worrying that ESD spike might damage the scope which
has 250V max rating. Is oscilloscope fast enough to capture ESD spike?
What equipments or test setup are needed in order to capture ESD
spike? Thanks.

 

[Pooh Bear]

Dummy wrote:

Radio reset when ESD was applied to certain exposed conductive pins.
I would like to monitor the reset pin of the microcontroller using
oscilloscope, but worrying that ESD spike might damage the scope which
has 250V max rating. Is oscilloscope fast enough to capture ESD spike?
What equipments or test setup are needed in order to capture ESD
spike? Thanks.

Not sure that it need be the reset pin being toggled that's doing it. Also
not sure that it'll help you any, even if you can catch anything with a
storage scope. A non-storage scope would tell you nothing useful.

Sounds like you may have a poorly EMC compliant design. I note that you
say 'certain exposed conductive pins' . What are they connected to and why
are they exposed when EMC testing ?

It's acceptable IIRC to 'blank off' unused connectors with a protective
conducting cover for EMC testing provided that such covers are supplied /
installed and the instructions make it clear that they should only be
removed when a mating plug is inserted.

You *do* have good chassis ground bonding at all connector shells too I
hope ?


Graham

 

[Dummy]

ahkit1021@yahoo.com (Dummy) wrote in message news:<74bb84c0.0408122215.7c69218a@posting.google.com>...

Radio reset when ESD was applied to certain exposed conductive pins.
I would like to monitor the reset pin of the microcontroller using
oscilloscope, but worrying that ESD spike might damage the scope which
has 250V max rating. Is oscilloscope fast enough to capture ESD spike?
What equipments or test setup are needed in order to capture ESD
spike? Thanks.

Can zener diode be used as ESD suppressor? It is fast enough to shunt ESD to ground?