--- On Thu, 8/12/10, Ken Javor <[email protected]> wrote:
And similarly, not because of MU but because of 17025 or perhaps ISO
9000, I’ve seen test equipment that could easily have been calibrated in house,
such as current probes, LISNs and a 41 inch rod antenna have to be sent to the
calibration lab. This is totally unproductive, except for the calibration lab.
And I would argue further that it is detrimental to the discipline, because if
you do your own calibration, you understand better how things work.
This is a subject near to my heart. I've performed in-house calibrations of
cables, LISNs, CDNs, current probes etc, and I agree 100% with what you said.
Knowing the procedure helps to understand how things work and, just as
important, gives a person the knowledge of how to perform quick verifications
of a test setup in case there is ever any question as to the proper operation
of that equipment.
Every so often, a conversation comes up in the lab about whether we should do
in-house calibrations. The issue is never about MU, cost or validity of data,
it usually hinges around 17025 and what auditors will say.
IMHO, shipping LISNs and/or CDNs to have calibrations performed by a cal lab is
less reliable than in-house calibrations. This has little to do with the cal
lab's ability, but from the possibility of damage during shipping. I've had
CDNs come back with stuff rattling around inside (possibly chips off of
ferrites?). If I can't perform an impedance verification in house, then what
should I do to insure it is not damaged - send it back to the cal lab?
Bob R.
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