I want to measure the attenuation of a long cable by means of an S11 measurement.
The other end of the cable is terminated with a short.
I use the dB magnitude format, and what I see is the attenuation of two times the cable attenuation.
How can I bisect this result in dB with the Trace Mathematics?
In this context, we have to keep in mind that the following applies:
log(x) / 2 = log( x ^ 0.5)
When we take the square root of the linear magnitude and show this result in a dB magnitude, we have thus bisected the dB result.
So just do the following:
- Take the S11 measurement in dB Mag format as Trc1
- Add Trc2 with the same settings as Trc1
- Perform a User Def Math for Trc2 using the formula
linMag ( Trc1) ^ 0.5
- Switch the Math = User Def for Trc2 on
