rfsa fetchiq

[CTrageser]

Hello,

Im working with RFSA FetchIQ. If this vi is used in Complex WDT 1Rec 1Chan and timestamp type is that to absolute time then the data holds a real timestamp of today, so everything is fine and makes sense to me.

But If it is used in 1D I16 then the wfm_info.absoluteTimeStamp does not a hold a absolute time. If this double is converted to a LabView Timestamp it always dates back to 1904.

I don't understand this. This is obvioulsly no absolute but a relative timestamp in seconds.

What is the explanation and what could be done to get in 1D I16 an absolute timestamp.

many thanks

christian

[JÞB]

In this case you've managed to get cought by a poor choice of words on the part of the RFSA Developement team.  The wfm Info  "Absolute timestamp" just gives you a number of seconds of the first returned point since the acquisition started.  So it is "Absolute" to the acquisition but not a true timestamp.  it can help reassemble records into the correct order and help ensure there are no gaps.  "Absolute" was probably chosen to diferentiate it from the "Relative" Timestamp which relates the first point to the ref triggger.

The help could be clearer on the fine point.

[CTrageser]

"Very poor choice of words!"

ok then lets ask another question. Is it possible to get the IQ data as I16 values together with the values for gain and offset (both doubles) and an absolute timestamp for the first sample?

Because an absolute timestamp is necessary and it would be nice to have the data in form of I16 with two double values to save diskspace?

[CTrageser]

I guess this means no?