I'm assuming the goal of your customer is to save a few bucks on the testing. 
This is where you turn on the Used Car Salesmen mode (no offence) and offer 
them a onetime deal they cannot resist to test all AC Mains ports separately as 
it should be done. They feel like they got a good deal and you tested the 
product they way you feel most comfortable. Once the precedence has been set, 
they will test all ports separately in future visits.

On the other hand, I often get customers who come in wanting to test 100 
different modes and configurations. Once they figure out how much time that 
will take, they look for shortcuts in our testing procedures to speed things 
up. Then six months later they call you wondering why your test report seems 
incomplete for those tests. Don't let them push you. Take the time to perform 
and document the test the way you ran it each time. If they only want to look 
at one frequency, fine, but take the time to properly document it. Then you 
don't have to try to explain it later.

The Other Brian

From: Larry K. Stillings [mailto:[email protected]]
Sent: Tuesday, February 18, 2014 12:23 PM
To: [email protected]
Subject: [PSES] EN 61326-1:2006 Immunity Testing with Multiple Power Cords

All,

I have a customer whom makes a piece of laboratory equipment that consists of 4 
parts, each part having its own power supply. The customer would like to claim 
that they sell a power strip with the system, and all four power cords plug 
into the strip and therefore only one set of power cord tests needs to be 
performed for Immunity.

For Emissions it is clear per EN 55011 that each power cord must be tested for 
conducted emissions, for Immunity it gets a little less clear. Should each 
power cord be tested individually for EFT, Surge, CRFI and VDI, or can I use 
the customer supplied power strip and perform the testing once.

Any guidance or references to clauses in standards is greatly appreciated.


Larry K. Stillings
Compliance Worldwide, Inc.
Test Locally, Sell Globally and Launch Your Products Around the World!
FCC - Wireless - Telecom - CE Marking - International Approvals - Product Safety
357 Main Street
Sandown, NH 03873
(603) 887 3903 Fax 887-6445
www.complianceworldwide.com<http://www.complianceworldwide.com>

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