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N9030A PXA - absolute amplitude amost 2 dB high

Question asked by SteveReeves on Jul 26, 2012
Latest reply on Jul 30, 2012 by SteveReeves
I am looking at an Agilent N9030A PXA that's coming up for its first year cal. The Absolute Amplitude test is failing by almost 2 dB and reads high at 50 MHz at -24 dBm. I'm using a Fluke 9640A-LPN Precision RF Source with a 50 ohm head as the standard. I've also checked at 10 MHz using an HP 3335A and an HP 8657B, which all agree that the PXA is reading too high.

Is there an easy way to tweak the gain of the PXA to within tolerance, without using the Agilent Test/Alignment software package? I've also checked that there's no amplitude offset, the error carries through all of the IF bandwidths, and have excercized the attenuator and available switch paths.

If this sounds more like a repair issue ( the x-series are typically very stable from what I've seen ), this unit is under warranty until Nov 2015.