Calibration can be traceable or not to International Standards.
As long as MU is taken into account correctly, one can do
virtually all calibrations in house, albeit with higher MU then if done
external .
While I agree that you are probably correct, why can't an in-house calibration
have as low a MU as one done by an external cal house?
I've gotten obviously incorrect calibration data back from an external cal lab
for a current probe once. It was obvious (to me) that they were trying to
measure near the noise floor at the low end of the frequency spectrum (10kHz
in this case). The data did not follow the manufacturer's typical curve at the
low end, and it did not follow their own data from the previous year's
calibration. They did not alert us to any problem. I performed an in-house cal
on the device and it followed the expected curve. Who has the lower MU in this
case? This goes back to how do you quantify MU for the lab personel.
Bob R.
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