1.343 Vrms = 2.555 dbV, how? using the digital analyzer HP3561

Discussion in 'General Electronics Chat' started by tuan.le007, May 3, 2017.

Nov 29, 2016
46
1
I have the hp 3561a dynamic signal analyzer.
using the function
LINEAR, I measured 1.343 Vrms
using LOG, I measured 2.555 dbV.
Can someone explain to me how this work?
formulas and calculations would help. I need to convert this in my code in order to measure 1.343 on the display.
It is showing 2.5555 dbV right now.

thanks

2. Papabravo Expert

Feb 24, 2006
11,779
2,495
$20 \times log(\frac{1.343}{1})\;=\;2.56 \text dBV$

3. crutschow Expert

Mar 14, 2008
20,471
5,797
dBV is the voltage in dB relative to a 1V reference.
That's shown in the equation in PB's post.

To convert dBv to volts, you use the inverse equation:
10^(2.56dBV/20)= 1.343V