User Manual

Spectrum Analysis
R&S
®
Scope Rider RTH
129User Manual 1326.1578.02 ─ 08
If a limit check is activated and the measured value exceeds the specified limit for
a harmonic, a limit violation has occurred. The background of the harmonic is high-
lighted red.
Remote command:
HARMonic:RESult<m>:CLIPping? on page 324
HARMonic:RESult<m>:FRQMissing? on page 324
HARMonic:RESult<m>:LIMViolation? on page 328
(12) RMS
The calculated root mean square (RMS) amplitude in the entire signal, that is: for all
harmonics and the fundamental frequency.




1N
0k
RMS
)k²(u
n
1
U
Remote command:
HARMonic:RESult<m>:RMS[:CURRent]? on page 329
HARMonic:RESult<m>:RMS:MINimum? on page 329
HARMonic:RESult<m>:RMS:MAXimum? on page 329
(13) Total harmonic distortion (THD)
THD (total harmonic distortion), that is: the root mean square (RMS) amplitude (voltage
or current) of the harmonics.
The value is provided either:
●
Relative to the RMS amplitude at the fundamental frequency (first harmonic,
THD
F
):



64
2i
2
i,RMS
1,RMS
F
U
U
1
THD
●
Relative to the total power of the signal (THD
R
):
2
F
F
R
THD1
THD
THD


Remote command:
HARMonic:RESult<m>:THD[:CURRent]? on page 330
HARMonic:RESult<m>:THD:MINimum? on page 330
HARMonic:RESult<m>:THD:MAXimum? on page 330
HARMonic:THDType on page 323
(14) Selected harmonic
Some results are provided for a single, selected harmonic. You select the harmonic by
tapping the number at the bottom of the bargraph. The selected harmonic is highligh-
ted.
Remote command:
(determined by suffix <n> in remote command)
Harmonics Measurement (Option R&S
RTH-K34)