skyismylimit
Member level 1
absolute power in db
hi all,
I need help with the hp 4751a network analyser (which is outdated in agilent) . I want to measure the oscillator output power using this analyser. first , i measured a reference signal which is 200MHz 1Vp-p square wave. The impedances on both reference and the network analyser is 50Ohms.
There was no option for display in dBm in that analyser. It shows absolute power in dB. the value i get in spectrum is -43dB for this measurement.
Can anyone help me understand the value of this power? is it jus 10*log(V^2/50)??? where V = .5? if i did that, I am getting -23dB.
When i measure without any source, the measurement is around -115dB.
please help me in understanding this.
thanks in advance
amar
hi all,
I need help with the hp 4751a network analyser (which is outdated in agilent) . I want to measure the oscillator output power using this analyser. first , i measured a reference signal which is 200MHz 1Vp-p square wave. The impedances on both reference and the network analyser is 50Ohms.
There was no option for display in dBm in that analyser. It shows absolute power in dB. the value i get in spectrum is -43dB for this measurement.
Can anyone help me understand the value of this power? is it jus 10*log(V^2/50)??? where V = .5? if i did that, I am getting -23dB.
When i measure without any source, the measurement is around -115dB.
please help me in understanding this.
thanks in advance
amar