Instructions

Spectrum Analysis
R&S
®
Scope Rider RTH
133User Manual 1326.1578.02 ─ 15
Start Frequency [Hz] 0
Frequency Resolution [Hz] 76293.9
Table 6-6: Spectrum (trace) data (converted to table data)
Frequency Clear/Write Max Min Average
[Hz]
[V]/[A]
*)
[V]/[A]
*)
[V]/[A]
*)
[V]/[A]
*)
0 0.000113039
76293.9 0.000226932
...
*) depends on probe setting
Converting voltage or Ampere to power values
The spectrum results are provided as voltages or in Amperes (depending on the probe
setting). To convert the these results (U/I) to power values (P), use the following equa-
tions:
)
V1
U
lg(20)U(P
dBV

)
A1
I
lg(20)I(P
dBA

)
1
R
lg(1030)U(P)mW1/
R
U
lg(10)
mW1
P
lg(10)U(P
dBV
2
dBm


)
1
R
lg(1030)I(P)
mW1
RI
lg(10)
mW1
P
lg(10)I(P
dBA
2
dBm




Where:
●
R = 50 Ω
●
P = U * I = U
2
/ R = I
2
* R
6.3 Harmonics Measurement (Option R&S RTH-K34)
With this measurement, you can easily measure the harmonics of an input signal. In
addition, the total harmonic distortion (THD) is calculated.
The harmonics measurement performs an FFT on the input signal and determines the
power levels measured at the specified fundamental frequency and at each harmonic.
Harmonics are frequencies that are a multiple of the fundamental frequency.
As a result, the magnitude, frequency and phase values for the selected harmonics are
shown, as well as the RMS power values and the total harmonic distortion (THD).
Harmonics Measurement (Option R&S
RTH-K34)