Every engineer knows:
"Who measures a lot, measuers a lot of sh..."
It means;
The individual setup of a measurement/test environment will influence the results. (Similar to: I only believe into statistics I have falsified myself).
This is why a large number of measurement procedures are fixed in international, national or industry standards (i.e. IEC, IEEE, EIA, DIN, IHF, AES/EBU and more).
A plausibility check is necessary to help to determine, whether the measurement results are relyable or whether you need to apply changes to your measurement/test setup.
In addition, all measuring equipment has tolerances. The measured value has therefore to be understood as value +/- tolerance.
These are essential basics for everyone who measures/tests.
Martin
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