Chris,
I've built several CDN's. Repaired both CDN's and LISN's. Never messed with
building an EM clamp. Too much hassle IMO.
As far as calibration, I try to calibrate as much as is practical "in house".
All the LISN's, ISN's, CDN's, cable loss, amplifier performance, etc etc .
But in reality those "calibrations" are just "verifications".
To perform those verifications most people are lacking a network impedance
analyzer. The test jigs or setups are easy to build or cheap to purchase.
Regarding an accrediting organization accepting the results, you'll need a
process. You can't go wrong by referencing CISPR 16 et. al. in that respect.
You'll need the verification data. AND, you'll need the measurement
uncertainty.
The last item, you can gather from your impedance analyzer accuracy
specifications (and calibration report) and the test jig VSWR & losses.
As for where you can send you in-house built test items, most any ISO17025
test lab which calibrates EMC or similar devices can perform the calibration.
Regards
David Spencer
EMC Engineer
Xerox Corp.
________________________________
From: [email protected] [mailto:[email protected]] On Behalf Of
[email protected]
Sent: Wednesday, December 10, 2008 5:00 PM
To: [email protected]
Subject: DIY Equipment and Calibration
I'm aware of some people making their own CDN's and LISN's among other
things
and I have few questions about that.
1) Has anyone tried to build their own EM Injection clamp?
If so, were you able to find a ferrite supplier that sold
half-ring
cores?
2) Is it acceptable to calibrate your own equipment?
If so, how do accrediting bodies view this, and what
documentation
will they want to see?
If not, does anyone have suggestions about where in the US I
can send
such homemade equipment for calibration (preferably Western US to save on
shipping)?
Thanks,
Chris
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