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Possible bug when reading back trace data via VISA COM

Question asked by DanLorek on Nov 30, 2007
Latest reply on Dec 4, 2007 by DanLorek
Hi,

I'm using 7.20 VSA with a DSO81204B to capture and demodulate a transmitted MB-OFDM signal and am having an issue when retrieving the data via VISA-COM. The Agilent IO control version is 14.2.8931.1. The programming language is VBA and it appears the data being retrieved for a specific trace is being corrupted... possibly.

Looking at the attached screen capture, you can see the code is operating on Trace C (or 3) and should be retrieving the following data points according to the .RawDataValueNames:
OverallEVM
OverallEVMdB
HeaderEVM
HeaderEVMdB
PayloadEVM
PayloadEVMdB
PacketPwr
SyncPwr
ChanEstPwr
RelChanEstPwr
HeaderPwr
RelHeaderPwr
PayloadPwr
RelPayloadPwr

The issue is that several of the returned items do not correlate with the values shown in the VSA window, namely, the Packet Pwr. You can see the actual readback values in the Immediate window of the VBA IDE. Please review and let me know if there is an actual issue here.
Thanks,
Daniel Lorek  

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