Need to configure the amplitude (dBm) for an agilent N5181A

[Bebeto]

I am using LabVIEW to configure the frequency and amplitude for an agilent N5181A, I am having problems finding a way to setup the amplitude correctly as the drivers for this Signal Generator do not show a control for the amplitude.

[JÞB]

Command ref

[:SOURce]:POWer[:LEVel][:IMMediate][:AMPLitude] -130 dBm to +25 dBm

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Send the command

Message Edited by Jeff Bohrer on 01-09-2010 12:43 PM

[Bebeto]

the command is being sent the problem is that the units are dB and I want them to be dBm

please see the picture.

[JÞB]

There are controls for power (in dBm) and power offset (I assume a correction factor for path losses so that you can set power at target).  

dBm is a logrithmic ratio of 1mW and has a magnitude and SI units V*A

dB is just a log ratio and has no unit (like % and ppm)

So  XdBm + YdB does equal X+YdBm.  

[Bebeto]

by enabling the power reference to off I was able to send the value in dBm, thanks !