CF-5200 Frequently Asked Questions
Question number FAQ-0603
(1) What happens when dBVr is converted to voltage? (2) How is the amplitude reading from the time-domain waveform converted to dB?
(1)dBVr=10LOG{Vrms/(reference)} 2 =20LOG(Vrms)
The reference is the actual value 1Vrms
Vrms＝10dbVr／20
(2) Since time waveforms are a synthesis of various frequencies, care must be taken when calculating dB from the waveform peaks.
The calculation is P-P=1.39mV.
For the peak amplitude (0-P), it is 0.695mV, thus (1) is the same as
dBV=20LOG(0.695×10 −3)
The reference is a peak amplitude of 1V.
However, the frequency is unknown.
Chapter of the relevant instruction manual
4.3.1 Units of the Y-axis of the Spectrum
Last updated: 2000-04-10