The real question is 'How is the product used?' If running for one
cycle and then in stand-by for the rest of 2 hours is 'normal
operation', then test it that way. But if it's usually run more or less
continually, being switched back on when it stops, then it isn't correct
to allow it to run in stand-by during the test.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2019-06-28 14:24, Brian Kunde wrote:
Reference IEC/EN 61000-3-3:2013 section 6.5 regarding Observation
Period. The Electrical Equipment (EE) under test is NOT listed in
Annex A.
We are trying to make sure we are testing a product correctly. Your
help would be greatly appreciated.
The EE has a cycle time of about 15 to 20 minutes. Since the cycle
time is greater than 10 minutes, it is my understanding that the cycle
is NOT repeated to determine the Plt. So would it be correct to start
up a 2-hour test, run the EE through a single cycle and then just let
the EE run in standby mode for the remainder of the 2-hour test?
Here is our situation. We have an EE under test that passes the 10
minute Pst limit with a value around 0.8 (1 is the limit). If we
repeat the operational cycle over and over again during the 2-hour
test, we again will get a Plt value of about 0.8 (limit is 0.65) and
Fail. But if we run the cycle only once and then let the EE sit in
standby mode for the remainder of the 2-hour test, the Plt will creep
down below 0.65 and pass the test.
Again, we want to make sure we are performing the test correctly
according to the standard.
Thanks to all for help on this.
The Other Brian
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