28-11-2016, 10:46 PM
Oh, just remembered the comment about the gear needing to be 10 times better than the DUT (device under test)...
That can be a good rule of thumb for some situations, but it's not the case for measuring distortion.
If the "floor" of your distortion setup is 0.01%, and you measure 0.01%, you can be confident that the DUT is better than 0.01%, but you can't be more precise than that...
If, however, you measure 0.03%, then 0.03% is going to be the answer, give or take.
Given the nature of THD+N measurements, extreme precision is pointless anyway
Cheers,
Mark
That can be a good rule of thumb for some situations, but it's not the case for measuring distortion.
If the "floor" of your distortion setup is 0.01%, and you measure 0.01%, you can be confident that the DUT is better than 0.01%, but you can't be more precise than that...
If, however, you measure 0.03%, then 0.03% is going to be the answer, give or take.
Given the nature of THD+N measurements, extreme precision is pointless anyway
Cheers,
Mark
