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E4440A Hang Up Locating Carrier for Phase Noise measurement

Question asked by miyamky on Dec 1, 2011
Latest reply on May 16, 2012 by tabbott
I'm performing a phase noise measurement using the following commands (there are obviously more after) using SCPI over Ethernet.

:INST:SEL PNOISE
<1/2 second delay>
:SENSE:FREQ:CARR xxx MHz
<set start/stop locations>
<set smoothing and averaging>
<LPF 1/2/3 commands>

Sometimes (and it's quite rare) the analyzer will hang (it won't any buttons including PRESET) while attempting to locate the carrier (since it's so hard to reproduce I'm not 100% sure if it's hanging before or after attempting to set the carrier position).  I do know the carrier IS present.

Do I need to set the carrier position before placing the unit in Phase Noise mode or could it be something else?  I can list the other commands that are done too if that helps.  

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