What's the unit label of y-axis of PSD when using Spectral Measurement Express VI?
Hi:
What's the unit label of y-axis of PSD when using Spectral Measurement Express VI?
Selected Measurement : Power spectral density
Result : dB
No Averaging..
Is dB/Hz the magnitude label of PSD output? Thx!
There could be an issue the the Express VI converting your waveform data into the dreaded Dynamic Data Type, which is just causing more and more memory to be used.
So what I would recommend is use the DAQmx Configure Logging VI to configure DAQmx to stream the data as you read straight to a TDMS file. There are various other properties you can set to make the logging go across files. You just set up the logging before running your task.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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What are the units of the DAQmx counter?
Hello,
I created this VI and several similar ones a few months ago, but, I have forgotten some of what I did back then. I believe that this VI should measure period, using the counter on the DAQ chassis. Can anyone tell me the units of the period measured? I think it is seconds, but, I am trying to figure out how to figure that out! The values of the period are generated by the DAQmx READ function in the WHILE loop. What units is that function outputting to the array? What are the units of the array elements, essentially? See the attached VI.
Also, how do you know? I opened the DETAILED HELP for the DAQmx Read (Counter 1D DBL NSamp) shown in the VI but, I can't find anything on the units of the data coming out of the terminal labeled DATA with the orange wire, which is actually an array of periods, and we take the average of the most recent 15 or so period measurements.
I had a suggestion months ago for an online NI manual containing a description of Buffered EdgeCounting measurements, but, when I went to find it, the link had been changed by NI, so, I can't find that manual, but, I think the answer is probably there, because I recall that manual being very useful when I did this before.
Thanks for the guidance.
Solved!
Go to Solution.
Attachments:
continuously measure period buffered_singlechannel_forum Nov 13.vi 33 KBHI dav2010,
When you create a Virtual Channel, you should specify the units the counter task will use. There are several options which are listed in the help here:
http://zone.ni.com/reference/en-XX/help/370469AA-01/lvdaqmx/mxcreatechannel/#DAQmxCreateChannel%28CI...
I am not on a computer with LabVIEW right now, but I believe the default should be ticks, which is the number of ticks of your device's timebase. You can find that information in your hardware specifications.
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Nick Holmes wrote:
What you have there is a mess.
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NTSC is 720x486, even when it is Anamorphic.
You shouldn't be using an already letterboxed master to make an Anamorphic version. Get the master that was made before the letterboxing stage.
When you make an Anamorphic DVD it should display as 16:9 full screen automatically on widescreen TVs.
The same DVD will automatically letterbox on 4:3 TVs.
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Thankssnook wrote:
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> I am trying to use the parallel port on a win xp machine to send data
> a@ up to a 3k rate. This is for the the purpose of driving a stepper
> motor. I have tried the port.out vi and placed this vi in a loop and
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