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Latency of E4440A spectrum analyzer

Question asked by cgantz2000 on Nov 18, 2010
Latest reply on Dec 10, 2010 by nizuchi

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What is the expected latency of network communications to the E4440A or other spectrum analyzers. In my case, after doing a sweep, it takes about 3 seconds to fetch the X and Y points (1001 points). Reducing the number of points doesn't seem to effect the latency. Then later I fetch just two data points, and that also takes about 3 seconds. All those seconds add up. The sweep itself is only about 0.3 seconds.

I'm using IVI-com. I seem to remember an app note on increasing the data rate. Does anyone know what that app note is?

Thanks.

Chuck

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emcdude Nov 21, 2010 10:30 AM
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In 2008, I did some timing experiments to determine the trace capture speed of the PSA. Using the LAN IO with 8084 trace data points with a binblock capture, the capture time was 69 ms. The USB IO is faster than the LAN IO. I had an older PSA without the USB port so I didn't time that transfer.

Regards,
Pete B
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emcdude Nov 23, 2010 2:34 PM
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I forgot to tell you that Volume 1 of the programming manual for the PSA has a section on improving measurement speed.

Regards,
Pete B
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nizuchi Dec 10, 2010 12:20 AM
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Hello cganz2000,

How do you get trace data? As far as I know PSA doesn't have query to return X axis array. So you have to build X-axis data by yourself from Center, Span and number of points.

And, you can use "TRAC? TRACE1" to get Y-axis trace data. With 1001 points data transfer over LAN, it should not take 3 sec. My local test shows 72ms with FORM ASCII transfer. (average of 100 times)
If you use TRAC? query and still taking 3 sec, I wonder if there's something wrong with the LAN configuration (such as IP address conflict).
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Latency of E4440A spectrum analyzer

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