Alex,
Amendment 2:2001 to EN 61000-4-2:1995 (same as Amendment A2:2000 to IEC
61000-4-2:1995) calls for discharging "ungrounded equipment, or
ungrounded part(s) of equipment" between ESD zaps. You use a bleeder
cable with 470k resistors at both ends, connected to the horizontal
coupling plane for tabletop equipment. You may leave the bleeder cable
attached if it doesn't bother the equipment under test (EUT). But the
definitive method is to briefly touch the bleeder cable to the EUT, zap
the EUT, briefly touch the bleeder cable to the EUT, etc.
This amendment also permits:
* Long delays between ESD zaps.
* Using a carbon-fiber brush with bleeder resistors.
* Using an air ionizer (must be turned off for the air-discharge zaps).
John Barnes KS4GL, SM IEEE
dBi Corporation
http://www.dbicorporation.com/
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