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Unlisted power meter error code E4419B

Question asked by rob_chavez on Dec 22, 2011
Latest reply on Jan 3, 2012 by lynchdavidb
I am using an E4419B power meter with an 8481A sensor.

I am measuring the output power of a simple FET and all goes well as I raise the input power from -25 to 0 dBm.  The gain is 19 dB. 

Pin = 0, Pout = 19 dBm all is fine.  Pin = 1 dBm, Pout reads 999.

This is very repeatable.  The sensor is good up to 24 dBm so it can't be overload (error -231).

Has anyone seen this before?  Any ideas what's going on?