vertical scale 5152, set up the time

I use a pxi-5152 in a pxi-1033 chassis.

I want to play a trick and change the vertical scale between my measurements to increase the dynamic range of a signal that I'm scanning.  I made a loop and changed the vertical scale property node after each measurement.  It works, but when I timed it the loop, she seems to take 80 ms.  I need to do in less than 10 milliseconds.

Is it still possible?  I see the real time it takes for the scale change or there at - it something to speed up?

I also have access to a PXI real-time with the same card.  Could only accelerate things or is the digitized the limiting on the change of scale factor?

Thanks for any help

-Rich

Hi rich,

I see the real time it takes for the scale change or there at - it something to speed up?

You probably see the effect of the two.  There may be something of software that you can do to improve it, but there's always a material limitation when you do this kind of operation.  Switching of the means of vertical lines change from one type of mitigation to another path.  This means there is sedimentation time involved (electronic and mechanical, with obviously dominant mechanics).  The main element in the run-in will probably be the relays that are reversed.  There must be a minimum period after the passage of a relay to ensure the data read by the digitizer are correct / valid.

Since you know your signal is going in a direction (descending), then you may be able to improve somewhat by calling the property to write the new range, and then commit node & initiating in a loop which contains a minimum transformation (possibly using queues in LabVIEW to transfer the data in another loop of treatment).  If you need treatment in the loop, you must perform the treatment after niScope commit but before launch niScope.  This will allow the digitizer begin to settle in the new configuration, and you have to wait less time when you're ready to call to initiate.

I also have access to a PXI real-time with the same card.  Could only accelerate things or is the digitized the limiting on the change of scale factor?

Real-time processing ensures determinism, it does not necessarily speed up the application.  Determinism and defining a specific priority for calculations of software can help speed upward the software that you are running, the interface of low-level PCI/PXI bus driver with the instrument probably will not change radically.  You can certainly try though and let us know what you measure.

I can understand if it is a fundamental issue, because normally people are not change the range of vertical entry on the fly, but if there is a way around it, it will avoid the need for me to put an amplifier with variable gain on the front-end server or buy a digitizer with more bits.

This isn't a perfect suggestion, but just a thought: If you have several scanners at your disposal, you might try setting each to a fixed vertical range and split the signal among them.  TClk, you can synchronize these devices together to make sure your data points are sampled at the same time, and then introduce delays in the initial on each digitizer trigger so that they take account of the waveform in a cascade mode.  For example,.

Digitizer #1, attached to the greater vertical reach, would have no time limit from the time wherever the trigger is received.

#2 digitizer, set at a smaller vertical range has a fixed period of (10ms?)

Digitizer #3, value the smaller Beach, has a fixed time (20ms?).

Otherwise, if you have assistance with the OR, you could try to call a technical sales engineer to discuss other possible options.

-Andrew

Tags: NI Products

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