Set variable samples per chanel from counter

Hi, all. I have to set variable samples per chanel for sample clock. I want to take that samples from counter input with different number of edges for every second (different speed of metal plate). What can i do for that task? Is there a god example for this problem?
Thanks.

Hi, GerdW. Thanks for reply. I want Sample Rate and Samples per Chanel to come from couter. CI is a metal plate with 52 tooth. The speed of metal plate is 500 cycles/min but it is not constant ( may be 490-520). For example rate of cycles is 500/60=8.33 cycles/sec. Rate of edges (tooth) is 8.33*52=433 edges/sec, but when speed goes over or under 500 the rate is different. How to put that variable samples in sample clock on AI?
P.S. Matlab script is to calculate max samples per chanel for mean function in while loop. In the picture control "Speed cycles/min" is that 500 cycles/min speed. I have to put in that control the variable rate of edges. Other solution is to set 1 sample per edge, but i have problem here to .

Similar Messages

Set variable filter for query from dashboard in IR 9.3

I have a dashboard that I want to set up to a process a query that has a variable filter. Can I set the variable filter in Javascript so the user does not see the variable filter/limit dialog? I'm using IR 9.3.

OK, never mind. I figured out how to do it right after I posted this:
mylimit = ActiveDocument.Sections["Query: New Users"].Limits[1]
mylimit.CustomValues.Add("TAA")
mylimit.SelectedValues.RemoveAll()
mylimit.SelectedValues.Add("TAA")
ActiveDocument.Sections["Query: New Users"].Process()
var MySection = ActiveDocument.Sections["Report"]
MySection.Visible = true
MySection.Activate()

Set Variable column in the Column page?

Hi,
I try to do this exercise but I facing some understanding problem, please guide me.
This is BIEE example to do Oracle BI publisher and Dashboard.
1. Create a dashboard prompt for the region and state to filter the BI publisher report results on the dashboard.
a. In Answers, open Region and State Prompt.
b. In the Set Variable column, select None from the drop-down list
c. Save the prompt in the My Sales folder as Region and state Prompt – No Variable.
My question from step a and b, I did not see any “Region and State Prompt” in Answers. Then clik Subject Areas – SupplierSales, then assign Region, and State. Then I try to make Set Variable column None. But I did not see where is Set Variable column in the Column page. May be I am doing wrong.
Please guide me to complete this.
Thanks,
Jo.

BindingContext bindingctx = BindingContext.getCurrent();
BindingContainer bindings = bindingctx.getCurrentBindingsEntry();
DCBindingContainer bindingsImpl = (DCBindingContainer)bindings;
DCIteratorBinding dciter = bindingsImpl.findIteratorBinding("prv_supvo1Iterator");
ViewObject vo = dciter.getViewObject();
vo.setNamedWhereClauseParam("BDIVN", divn);
vo.executeQuery();
where BDIVN is our bind variable.

How to set the sampling interval using DAQ device?

Now I have a capacity sensor and a 24 bit DAQ device (http://www.mccdaq.com/usb-data-acquisition/USB-2404-10.aspx).
The DAQ device has the maximum sampling rate of 50kS/s . My question is how to set the interval of data collection. For example, if I set the sampling rate to 2000, in continuous sampling mode, I use DAQmx read.vi in a while loop and set the 'number of samples per channel' to 100. I want to plot these data as a function of time by using a XY graph and also save these data. So I add a 'Mean' function to get the average of the 100 samples per each loop (than means, there are 20 data output per second). But when I set the 'number of samples per channel' much smaller (to get more data per second), there are some problems. It seems that the program cannot read so many data and get the average at a higher frequency. I don't know where the problem is. All in all, how to collect data more frequently?Maybe I didn't express my question clearly. I'll upload a simple program later if necessary. Thanks.
Solved!
Go to Solution.

Another question is in continuous mode, NI DAQmx uses Samples per channel to determine the buffer size. But according to the website you specified, it says if the acquisition is continuous (sample mode on the DAQmx Timing.vi is set to Continuous Samples), NI-DAQmx will allocate a buffer according to the following table. And for sample rate between 100 - 10,000 S/s, the buffer size is 10 kS. So if I set the sample rate to be 5000 S/s, and set the Samples per channel to be 20000, then what exactly the buffer size is? 20 kS or 10 kS?
Thanks.

A set from a set of sampled data from a thickness sensor.

A set from a set of sampled data from a thickness sensor.
The samples are stored in an appropriate array of up to 100 elements.
The values represent the depth of the insulation around a particular cable.
The thickness can vary from 0-4mm represented by a corresponding real value
stored in the array. as long as the depth is between 1 and 4 mm the cable
falls within the allowable specification however if it falls below 1mm it is
deemed to be too thin.
Design a VI that will identify the number of thin values and display as a
percentage of total number of samples.
The front panel have the must have the following:
An array of controls holding the sampled values.
An indicator holding the percentage of thin values.
Attachments:
Test Data 1.vi ‏14 KB

hi there, this is Faddi, I am doing the same assignment as the one you poested earlier!! I know its a very basic one, but i need your help in doin the second task asap PLEASE!! IF you could please...its as follows:
This is to be designed to work on a set of sampled data from a thickness sensor. The samples are stored in an appropriate array of up to 100 elements. The values represent the depth of the insulation around a particular cable. The thickness can vary from 0- 4 mm represented by a corresponding real value stored in the array. As long as the depth is between 1 and 4 mm the cable falls within the allowable specification however if it falls below 1 mm it is deemed to be too thin. Specification 1
To design a VI that will identify the number of thin values and display as a percentage of the total number of samples. The front panel must have the following: An array of controls holding the sampled values. An indicator holding the percentage of thin values. Specification 2
Thin values tend to appear as sections or patches along the length of the cable i.e. values of less than 1 mm stored in successive array elements. To design a VI that will meet specification 1 and will also calculate the number of these thin patches. The front panel will now have an extra indicator to display the number of patches.
Thankyou

Can 10000 sample per second can be acuire from a sensor through cRIO

I just want to know, can I acure 10000 smaple (when the programme run in real time) per second per chanel or more, when data taking from a sensor, through the cRIO.

Bikash wrote:
Can I apply this method in simulation loop. Where I want make my control algorithm.
It sounds like a perfect application for your needs. Remember to buy powerful hardware not having to worry about the performance.
http://sine.ni.com/nips/cds/view/p/lang/en/nid/210400
Or something similar performance with a PXI solution.
Br,
/Roger

Can you set samples per trigger for sound vi?

Hi,
I've been looking at both Matlab and LabVIEW for acquiring sound through a PC sound card. In Matlab you can change the sampling rate (8000, 11025, etc), the buffer size and the samples per trigger. In LabVIEW I noticed you can only change the first two using the SI VIs. How would I go about changing the samples per trigger?

Hello,
Could you describe your application and what you are trying to trigger? You can look at all the sound VIs in the advanced section of the function pallette and you can click on any VI and get the context help by pressing ctrl H. That will give some information on the way the VIs are set up and the features they include.
Good luck and have a great day!
Koninika
National Instruments.

G4 Power Book up and running good as new after Mac OS X install per instructions from original guide book. from disk and new pass word set per instructions in the guide book that came with the product.

G4 Power Book up and running good as new after Mac OS X install from disk per instructions from original guide book.

Glad to hear it. Enjoy your resurrected Power Book!

Multiple channels acquisition and Number of samples per channel

Hi,
I'm a new labview user and I need some help in trasposing an old traditional NI-DAQ acquisition software in a NI-DAQ-mx one.
I followed the tutorial (#4342) but I found a problem with Analogue 2D DBL Multiple Channels Multiple Samples DAQmx Read Vi.
I'm trying to acquire 8 voltage signals from a NI-USB-6341 device. When the Number Of Samples Per Channel I set is below the number of channels (8), the software acquires only a number of channels equal to the number of samples per channel I set.
Is that a normal behaviour?
Thank you
Daniele

This is my code. The problem is the same with or without the code for the scan backlog indexing.
Tomorrow I will try with the code from the example.
Thank you
Daniele
Attachments:
acq code.jpg ‏119 KB

How Can I Dynamically Name and Set Variable Values?

First one with a correct answer will have the FUNCTION named after them......
What I want to do is create 'new' variables based on the index of the parent.
So, if I have 4 subforms called 'Panel' (Panel[0], Panel[1], Panel[2], Panel[3]), I want do declare a local variable in my function to count from 0 to n for each Panel.
We won't know how many Panels we will have until runtime. So, I need the variables to keep track of the count (it's tracking the number of errors) - for each Panel.
Something like this:
if(obj.rawValue==null || obj.rawValue=="")
var errorCount[obj.parent.parent.index]=errorCount[obj.parent.parent.index]+1;
app.alert(errorCount[obj.parent.parent.index]);
I am assuming it has something to do with Arrays. But I suck at Arrays.
Thanks for the help.

You're correct, arrays are the way to go. Define your error array like this:
var errorCounts = [];
Then, understand that when an array entry is not set it will have the value 'undefined', so you can know if an entry has been initialized. So to increment the count for a particular index (subform occurance) use:
// If entry is being set for the first time, set it to 1. Otherwise increment count.
if ( errorCounts[index] == 'undefined' )
errorCounts[index] = 1;
else
errorCounts[index]++;
You can also loop through and initialize the array to zero; then you can remove the check for undefined. How and where you do this and how you figure out what 'index' is depends on how your form is set up and which event you're using to kick off the error check. Give me a little more detail on what you're trying to do.

Loading External SWF and setting variables

Hello Everyone.
I'm sure you are all a where of the FlashVars attribute for
Flash embeds which holds variables for SWF's when they are
rendered. I'm attempting to load an External SWF dynamically
from within my own SWF and need to provide it with the values
normally stored in the FlashVars. For the example below I
wait until the External SWF is completely loaded using the
onLoadInit event from moviecliploader and then i attempt to
set the required variables that the loaded SWF needs. This works
great in test and debug mode (ie. Test Movie and Debug Movie
from the Control menu), but when i publish my FLA to SWF and run
the SWF the variables will NOT get set in the loaded External SWF.
From my readings ive people have mentioned that the player is only
able to access Methods of an External SWF. If this is the case then
how do they expect people to set the FlashVars of dynamically
loaded SWFs? I investigated the loadVariables procedure as well and
had the same results in test mode and was wasn't reliable because
of timing issues.
The sample source is below... if anyone has any ideas or has
come across this issue before, I would really appreciate some
insight.
Thank you in advance for your time.
var loader_mc:MovieClipLoader = new MovieClipLoader();
var mclListener:Object = new Object();
loader_mc.addListener(mclListener);
mclListener.onLoadProgress = function(target_mc:MovieClip,
numBytesLoaded:Number, numBytesTotal:Number) {
// DO NOTHING
mclListener.onLoadComplete = function(target_mc:MovieClip) {
// DO NOTHING
mclListener.onLoadInit = function(target_mc:MovieClip) {
// WORKS IN TEST MODE NOT IN PUBLISH/SWF MODE
target_mc._root.param1 = "value1";
// WORKS IN TEST MODE NOT IN PUBLISH/SWF MODE
_level0.container_mc.param1 = "value1";
this.createEmptyMovieClip("container_mc",
this.getNextHighestDepth());
container_mc._lockroot = true;
loader_mc.loadClip("somecoolflash.swf", container_mc);

I've tried that as well and it behaves the same as onLoadInit
... Works when i test but doesnt when i publish to a swf. I think
this is security related and the flash player just cant write to a
loaded swf and set variables.

Buffer size and samples per channel

I have a question regarding the allocation of the output buffer. I have
a digital I/O card PCI-6534 and I use the driver NI-DAQmx 7.4.0f0. I
would like to generate a digital output using different clock rates.
For example, I need to write 500 samples at 1000 samples per second and
other 500 samples at a rate of 10000 samples per second. the simplest
solution is to prepare two different waveforms, write the first one on
the buffer and generate the output. Then I can load the second waveform
on the buffer and generate the second output. In order to minimize the
delay between the two output sequences, I would like instead to write
the buffer once. I tried to set the buffer size to 1000, and the number
of samples per second to 500, but it doesn't work. There is a way to
set independently the buffer dimension and the number of samples which
have to be generated?

I can post the whole thing but I'll talk a little about it. It's a producer consumer loop with a continuous analog input sample from external clock program in the producer loop. Right now the consumer loop has a simple write to spreadsheet VI in it but eventually I want to average each revolution (well, two since it's a four stroke but that's neither here nor there) of pressure traces and spit out a single curve.
The wiring is simple. I have a voltage supply feeding the encoder and the quadrature A input on PFI 8 of the 6212 DAQ. I also have the Z index plugged in but nothing else to it. The analog input is a BNC right to AI 0. I can make a diagram if you want one. I've scoped the rotary encoder output and it looks great, very square with small relative rise times.
Attachments:
Yanmar Program V2.vi ‏46 KB

Sample per channel and sample to read

Hello everybody
I am new in LABVIEW and I have some difficulties with something.
I don t know exactly what is the difference between the sample per channel et the sample to read. I believe knowing that the sample per channel is the size of the buffer which is more big than the sample rate but I don t know what is the sample to read.
I ve tested with different sample per channel and sample to read. Sometimes I have an error and sometimes know and I would like to know why. If you have any example for I understand better, it will be great.
I really need to understand this part for my project
Thank for your help
Romaric GIBERT
Solved!
Go to Solution.

Hi Roro,
As you mentioned, when acquiring continuous samples you can specify the sample buffer size by placing a value at the input "samples per channel" on the timing vi. The "number of samples per channel" input on the read vi which automatically names a control/constant with "samples to read" specifies the number of samples you wish to pull out of the buffer in one go when reading multiple (N) samples. This link may provide a bit more clarification. I have also attached a good example from the NI example finder which you may find useful to explore. I'm assuming you are using the DAQmx driver set so please let me know if this is not the case, but the same principles should apply either way.
This therefore means when sampling at a given rate, you need to ensure you are pulling data out in big enough 'chunks' to prevent the buffer from overflowing (which may well be causing the error you are seeing). Conversely if your sampling rate is slow and your read vi is having to wait for the number of samples to read you specified to be available, it may throw a timeout error. You can avoid this by either increasing your sampling rate, reducing your samples to read or increasing the timeout specified at the read vi input (-1 means it will wait indefinitely).
Let me know if this helps and how you get on.
All the best.
Paul
http://www.paulharris.engineering
Attachments:
Cont Acq&Graph Voltage-Int Clk.vi ‏27 KB

Using Spry Data Set Variable in Recordset

I have a page that contains a spry data set and a recordset. The recordset uses one of the variables from the spry data set to filter its results. how do I apply the spry data set variable to the recordset?

I believe passing this the variable through the URL requires you to update the page, right?
Yes
Is there anyway to grab the spry data set variable direct and apply it to your recordset filter?
The SpryDataSet variable can only be used on the clientside (JavaScript) so you will have to get your recordset using JS.
A page refresh can be set in motion if you add {useCache: false, loadInterval: 500} to your dataset to then set an observer to your dataset to invoke the page refreash function.
Gramps

OBIEE 10g - Can I use logical SQL to set variable?

I am trying to set value of a session variable in the Advanced tab Prefix box of a request.
Assigment of absolute value like this is working good:
SET VARIABLE MYVAR=1;
Can I set the variable using logical SQL? Something like:
SET VARIABLE MYVAR = (SELECT table1.col1 from catname where table1.col2=1)
Thanks in advance.

Hi,
You can create a session variable or dynamic variable in the RPD and try using it in here at the Advanced Tab prefix.
But still check yourself if you need multiple values returning in the SQL statement.
Hope this is helpful/ useful.
Regards
MuRam

Set variable samples per chanel from counter

Similar Messages

Maybe you are looking for