Kevin
You are only verifying that the equipment is working so there is no need to
check absolute levels or waveforms etc, that is the function of the
calibration.
Our EMC lab has been assessed to ISO 17025 by TUV International and they are
satisfied with the following procedure which is extracted from our EMC lab
Quality Manual.
In our in-house EMC reports (which TUV are prepared to endorse) we record
the latest date of calibration. Following the next calibration we assess
whether there is a requirement to repeat any work based on the outcome of
that calibration i.e. if the device is outside the manufacturers
specification we repeat the work performed in the intervening period.
1. EQUIPMENT USED FOR BS EN 61000-4-2
a) Electro-static discharge gun
S/N: 2494
In house equipment No. 9853-22-998
METHOD:
1. Configure item a as per section 6.5 of EMC lab instruction manual.
(Details configuration as per manufacturers
instructions)
2. Set the ESD gun to 8kV air discharge, single shot.
3. Attempt to discharge the gun to the insulating block (a block of
wood 100 x 150 x 700mm) on the earth plane.
4. Check that a discharge did not occur by observing no audible signal
>from the gun and the display of the gun indicates 0.0kV.
5. Attempt to discharge the gun to the earth plane.
6. Check that a discharge did occur by observing an audible signal from
the gun and the display of the gun indicates over 6kV.
7. Update the Equipment checklist spreadsheet to show that these pieces
of equipment are functioning correctly.
Ian Gordon
From: Ken Javor [mailto:ken.ja...@emccompliance.com]
Sent: 21 April 2004 20:51
To: Kevin Harris; EMC-PSTC (emc-p...@ieee.org)
Subject: Re: ESD Gun Verification between calibrations
Never done this before, so this is shooting from the hip. If you have a
receiver, as opposed to an analyzer, you could, using sufficient
attenuation, drive the input directly or using some transducer to measure
the spectral signature from dc to daylight right after calibration, and run
checks against that for intermediate checks. If you have an analyzer with
even rudimentary preselection, you can do the same. Obviously you would
have to use the max hold function and run multiple shots. I don't know how
fast those things recharge - if it takes a long time that would make this
technique impractical.
From: Kevin Harris <kevinharr...@dsc.com>
Reply-To: Kevin Harris <kevinharr...@dsc.com>
List-Post: emc-pstc@listserv.ieee.org
Date: Wed, 21 Apr 2004 11:51:04 -0400
To: "EMC-PSTC (emc-p...@ieee.org)" <emc-p...@ieee.org>
Subject: ESD Gun Verification between calibrations
Dear Colleagues,
We are in the process of moving some of the ESD testing we currently do (as
pre-compliance to formal testing at an agency or test house) to formal
testing under a laboratory accreditation program. In that regard, the issue
of verification of the ESD gun's performance has come up between calibration
cycles. Short of spending a lot of coin on a scope with a very fast one shot
capture and running the formal calibration test as a method of periodic
verification, does anyone have some suggestions for alternative methods that
aren't so expensive but would still satisfy an accreditor as being a
reasonable approach.
Thanks
Kind Regards,
Kevin Harris
Manager, Approvals Group
Digital Security Controls
3301 Langstaff Road
Concord, Ontario
CANADA
L4K 4L2
Tel: +1 905 760 3000 Ext. 2378
Fax +1 905 760 3020
Email: kevinharr...@dsc.com
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