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E4440A trace data

Question asked by akalei on May 3, 2011
Latest reply on May 4, 2011 by akalei

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I'm trying to retrieve data off of the E4440A as fast as I can. I configure the analyzer and the sweep time is about 2.6 seconds. When I read back the data it takes about 5.5 to 6 seconds to take a sweep and plot the data. It shouldn't be taking that long should it?

Span 10 MHz
Points 101
Atten 0 dB
VBW 200 Hz
RBW 300 Hz
Manual FFT ON
FFT/Span 11 points

I use the following SCPI commands to read back the data.

:INIT:CONT OFF
:INIT IMM;*WAI
:TRAC:DATA? TRACE1

Thanks!

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crazie May 3, 2011 7:12 PM
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Is there a difference between similar settings with FFT off? Have you timed the trace capture vs plotting to see which one is taking the longest amount of time? Also, what are you using to program with (Matlab, VB, etc.)?
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akalei May 4, 2011 12:57 PM
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Thanks for the reply. It seems that there is some overhead time associated with the number of FFT points. When the number of FFT points was reduced from 11 to 1 the time to read back the data was about 4.2 seconds per sweep. Pretty much all of the delay comes from the read back of the data.
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E4440A trace data

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