Vic,
I wonder how realistic this type of test is. It does model a charged person
touching the floating device. But another ESD mode is when a person is
holding the device and touches the device to the car body. In this case it
is more like a CDM discharge with very high current for the time it takes
the energy to propagate to the end of the device and back - or not. The
person holding the phone does act as a fairly good termination as the device
characteristic impedance will be close to the characteristic impedance of
the persons arm - about 300 ohms. In this situation the high current will
exist for the time it takes the signal to propagate one way. For a cell
phone the high current will exist for a few hundred picoseconds.
Dave Cuthbert
LINEAR TECHNOLOGY CORPORATION
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Thank You
From: [email protected] [mailto:[email protected]] On Behalf Of Vic
Gibling-NonTRW
Sent: Friday, August 18, 2006 5:43 AM
To: [email protected]
Subject: ESD testing - automotive
Dear colleagues,
The unpowered product is required to be insulated from the ground
plane. The product is NOT grounded.
It is subjected to a number of discharges at a rate of 1 - 10 seconds.
If the charge does not neutralise before the next discharge what happens
and why is this test done in this manner?
The same product (and arrangement) receives discharges to each
connector pin. To ease applying the discharge to small pins a short
single pin extender is used. The procedure is to remove the extender
after fulfilling the discharge requirements and use it for the next. It
is removed by hand. Any comments?
I would appreciate your views and comments.
Vic
Vagabond EMC Engineer
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