SIGLENT SDS2000X - Page 201

SIGLENT
SDS2000X User Manual 179
Non Spec: the Limit (RMS) is 0
Pass: Margin is greater than 80% of the limit but less than
100% of the limit.
Fail: Margin is less than 80%
THD (Total
Harmonics
Distortion)
THD =
X
2
2
+ X
3
2
+ X
4
2
+ ⋯ + X
n
2
X
1
× 100%
Where :
X
n
= voltage or current of each harmonic
X
1
= fundamental voltage or current value