General Description
R&S
®
CMW-B400B/-B405A
19
User Manual 1176.8116.02 ─ 04
Fig. 3-7: Digital single tone result table
Table rows
The table rows provide the following results:
●
THD:
Total Harmonic Distortion, ratio of the harmonic distortion voltage to the fundamen-
tal wave voltage, in percent and as dB value.
THD [%] = sqrt (D / S) * 100
THD [dB] = 20 * log (sqrt (D / S)) = 10 * log (D / S)
The R&S
CMW displays THD [%] values up to 100 %. A result close to 100% may
indicate incorrect settings, e.g. a specified reference frequency which differs from
the actual frequency of the transmitted test tone.
●
THD + N:
Total Harmonic Distortion and Noise, ratio of the measured AF signal voltage with
a notched-out fundamental wave to the complete measured AF signal voltage, in
percent.
THD + N [%] = sqrt (N + D) / sqrt (S + N + D) * 100
●
SINAD:
Signal to Noise And Distortion, ratio of the complete measured AF signal voltage to
the measured AF signal with a notched-out fundamental wave, as dB value.
SINAD [dB] = 20 * log (sqrt (S + N + D) / sqrt (N + D))
●
SNR:
Signal to Noise Ratio, ratio of the signal power to the noise power, as dB value.
SNR [dB] = 20 * log (sqrt(S / N)) = 10 * log (S / N)
●
DC Level:
DC component of the measured analog AF signal in V
●
Frequency:
Frequency of the measured analog AC signal
●
Weighted / Bandpass Level, RMS:
Effective (RMS-averaged) value of the AC component of the measured AF signal,
measured in the weighting filter path / the bandpass filter path.
Table columns
The table columns provide a statistical evaluation of the results, see
Measurement Results
深圳德标仪器
135-1095-0799
