AnsweredAssumed Answered

Setting start and stop powers of power sweep

Question asked by cgantz2000 on Nov 19, 2009
Latest reply on Nov 20, 2009 by daras
Hi all,

I'm doing an smc power sweep on a PNA-X. The important part of the code is:
channel.SweepType = NASweepTypes.naPowerSweep;
pna.SourcePowerState = true; // turn power on
channel.StartPower = -20;
channel.StopPower = +2;

However, when I do this the channel Start and Stop powers are set to -24 and -2. The display also shows those same limits. The start and stop powers are being offset by the power offset (-4dB) set during the source power cal.

I had thought that when I did this before that the power offset was applied in the background so that if I put in -20, that would be what channel.StartPower was shown as and the actual source power would be whatever was required to get the -20 at the end of the test cable.

Am I wrong about that, or am I using the wrong properties to set the power, or what? I can offset my set powers in my program, but that's a little inconvenient.