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sampling rate

July 23, 2017, 1:15 am
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Hi everybody,

               I need some ideas to work with sampling rate, here i have some doubts.

1. I was acquiring a voltage signal from daq device usb 6211 with rse configuration mode and i have added sapling clock to acquire a samples of 10 per second per channel but i don't think it was getting a 10 samples per second per channel, instead of that it takes 10 seconds to acquire next set of samples to acquire.

2. My questions is that sampling rate which denotes no. of rate of samples to acquire per second per channel or it will be used to set for time delay to acquire a samples.

as i am a new to this labview, need to know about this important thing,

Thank you in advance,

regards,

Dinesh

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LabVIEW PID controlled PWM output

July 23, 2017, 3:38 am
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Dear All,

 

I need to control the heater with set temperature. My idea is to use PID control which can output duty cycle percentage and in-turn generate the PWM signal to control the SSR using single board RIO with 1 KHz frequency.

 

I have searched the forum for previous post. But unfortunate to find right one, most of them uses DAQ to generate variable duty cycle PWM output. Hence am using RIO digital I/O line in RT, am not familiar on how to proceed.

 

I would be happy to see the replies.

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Visa Serial interface problem

July 23, 2017, 4:28 am
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I am trying to read an array of string using the code as attached. I have an error with "scan from string" block every time I run the program. you can find sample of my data to be sent by my hardware to Labview as below

 

D10112.31D10212.31D10312.31D10412.31D10512.31D10612.31D10712.31\r\nCapture.PNG

 

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Find if string contains valid float

July 23, 2017, 6:15 am
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I have attached a VI.

A separate MCU board, sends data on computer COM port, in ascii format as below:

 

$-999.999;-999.999?

 

Total length of string is 19 max. It can be less than 19 also, for example number is small like  $9.999;9.999?

VI, continuously scans for 38 bytes of string, Then serach for $ & then take out two numbers in between from them. In VI,number separted are in string Voltage & Current.

 

Now sometimes, I read incorrect string also. So is there anyway to check the Voltage & Current strings, if they contain valid number between -999.999 to 999.999

 

 

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Labview 2017 Co-simulation Multisim VI

July 23, 2017, 9:13 am
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I am trying to build a hybrid power system with wind and solar power in Labview 2017. I have completed the Wind Turbine part of the system but I have some troubles with the PV. I built a circuit in Multisim 14.1 and I am trying to run co-simulation between the two programs. In Multisim I have already set the Labview terminal inputs and outputs. But when I go to use the Multisim Design VI, it is no where to be found. Was it erased from this version of Labview and replaced with something else? If not please let me know what have to do to get this to work.

 

Thanks

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Unable to analyse ECG signal

July 23, 2017, 7:53 pm
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Hai, I'm new to LabVIEW and currently doing a project about bio-signals. 
I came up with a program and I was able to collect my bio-signals. However, I'm unable to analyse it. My ECG analyse program either keeps saying that it doesn't have any input or it keeps analyse the wrong info. Is there anyway to improve the program to solve the problem?
I attached my program for reference.
Thanks.

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Question about Format Into String Function

July 23, 2017, 9:06 pm
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Hi, I make file name using Format Into String Function.

 

I want to make file name

Date_Name_bio.txt

but Format Into String Function create blank(spacing?)

So, file name is made 

Date _ Name _ bio .txt

How can i remove blank(spacing?)??

 

string.png

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Export projects with Scilab Nodes

July 23, 2017, 11:27 pm
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Hello everyone! I am currently trying to export a LabVIEW-project with Scilab nodes into an application file (.exe). I noticed that all VIs which include Scilab-nodes cannot be exported to an application file since I updated LabVIEW from Version 2016, 32-bit to LabVIEW 2017, 64-bit. During the application building I don’t get any errors and the application-file is built, but when I open the exported application I get the error message "The VI is not executable. The full development Version of LabVIEW is required to fix the Errors." As the program works properly when it is not exported, I assume that the code does not contain any errors and that the LabVIEW Scilab Gateway is working correctly (Scilab and the LabVIEW Scilab Gateway are updated to the 64-bit verison). Projects without Scilab nodes can also be exported without problems. The file ‘ScriptSiclab.dll’ is placed in the project folder and was selected as ‘Source File’ and ‘Always Included’ when the exe-file was built. Additionally the ‘ScriptScilab.dll’ was inserted to the Runtime-Engine (…National Instruments\Shared\LabVIEW Run-Time\2017\script'). As the ‘ScriptScilab.dll’ was not included as in “..National Insturments\LabVIEW 2017\resorce\script” I took the ‘ScriptScilab.dll’-file from the 2016 LabVIEW Version. In the attachement you can find a screenshot of a simple program opened in LabVIEW without export (working correctly) and the exported application (left) with the error-message. Also the block diagram of the program is attached. Have you ever heard of this problem? Do you have any suggestions what I could try to make the export work? Thank you very much for your help!
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field fox microwave analyzer version N9918A and LabView

July 24, 2017, 12:55 am
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Hi,

I have Labview 2015 , but no experience with it,I have a project implemented on labview,it consist of wide band spectrum sense code.

-the first question is :

-if I make a spectrum scan   for a signal generated from a signal generator using the labview and usrp 2932,is it possible  saving this data as a file in the labview?

-and how to use this data in the microwave analyzer,in another word how to make connection between the labview and the(field fox microwave analyzer version N9918A ) ?

I would highly appreciate any help. Thank you very much for your time.

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Control about LabView activex a CANoe test environement

July 24, 2017, 2:23 am
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I have a problem, I want control about LabView a CANoe test envirionment.

But If I add an automation refnum, I can only choose between 2 classes CANoe.IApplication3 and CANoe.IMeasurement, I saw a example which are used a autmation reference CANoe.ITestCase and about invoke node a ITestSequence and a proberty node ITestCase which selected the test case.
Could help me somewhere how I can show a access to the other classes?
The example which I find is stored in LabView 2014 and I used 2013 so I can't open this, have somewhere maybe a Vi example which open a CANoe Cfg and start a test case?
Thank you

 

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write to spreadsheet file issue and in sampling rate

July 24, 2017, 2:51 am
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Hi to all,

      I have created some vi to acquire a signal and save it in a csv file but when i was analysing it, at the 0th sec , the values which it was acquired is displayed in a same array that time label displayed but at the 1st second it displays in a next row of the array, i don't what was happening?, i need some ideas to clear the issue and also at the sampling rate when i was increasing it to 1000, there is a time lag to get the results, the project i deal with this is lvdt analysis, when i was moving the lvdt i need to see the voltage variations but at the high sampling rate there is a time lag to get the values and display it in a xy graph i was using NI usb 6211, need some ideas.

 

Thank you in advance,

Regards,

Dinesh

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New VI - default window size

July 24, 2017, 3:44 am
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Is there a way to specify the default window size when the "new VI" action is invoked? Both for the block diagram and front panel?

 

In 99% of cases the front panel is way too large by default. I know I can just resize after, but it's becoming tedious to do.

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New class VI - template modification

July 24, 2017, 3:47 am
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Is there a VI file that can be edited to change the default generated class VI for both static and dynamic dispatch?

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LabView communcation with rs485

July 24, 2017, 4:14 am
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I have a labview 2012. Now i try communicate with schneider electric em1200 through rs485 protocol. I do the program. But it show what we give to write buffer. please any one help me. how to program. front panel.PNGblock diagram.PNG

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Synchronization of two DAQ Assistant USB-6003

July 24, 2017, 4:54 am
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Hi all, I'm creating a VI which is supposed to use two boards USB-6003 to take some measurements. The first one is reading a voltage from two lasers which measure distance, the second one reads a voltage too, from a load cell. I need to take these measurement at a relatively high rate (50k) for a total amount of sampes of 5k. I set the two express VIs of the DAQ assistants ant they work well, but since now they are completely uncoupled, the two measurements are not synchronised. How can I modify the program (or the DAQ assistant settings) in order to reach this task?

 

Thank you all!

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Arduino UNO+HC-SR04

July 24, 2017, 5:41 am
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Hello,

I tried all solved and unsolved examples of Ultrasonic HC-SR04 sensor using Arduino of this discussion forum. But No-one works well. All VIs showed "Timeout Error" except this attached VI. But this VI always shows a constant value (48) as distance/result. I am using Arduino IDE 1.8.0. When I used Arduino code (Picture attached) the sensor works very well but I need a LabView code. I will use this code as a subcode/subVI in my main program code.

 

Any kind of help appreciatable. 

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Read VISA signal on function generator

July 24, 2017, 5:56 am
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Hi all,

 

I´m using labview (VISA I/O) to remote control a TGP3122 function generator. I set the wave parameter (kind of wave, frequency, amplitude ecc), turn on the wave, and then I want to read the voltage value, but I cannot find the command to do that.

 

In other words, when the function generator is working, I just want to know the voltage in that moment. How can I do? My idea was to use VISA write to ask the instrument for the value, and then VISA read, but as I said, there is not a command apparently.

 

Here is a link with the instrument manual, with all the remote commands: http://resources.aimtti.com/manuals/TGP3100_Series_Instruction_Manual-Iss2.pdf

 

Thank you for your help!

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A Problem of "Reference"

July 24, 2017, 6:13 am
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Hi, 

I have a problem to refer to a type which is contained into a cluster which is contained into an array. So the array is an array of clusters. 

Here is my SubVI

image.png

And the references which are contained into the "Array Reference out" refers to an Enum of the Cluster "Element". But I don't want that the references refer to this cluster "Element". I want that the references refer to Enum of the cluster of "array 2". Do you see what I mean ? In fact, I want to blink an Enum and if I can't acceed to this Enum by a reference, I can't blink it. However there is an Enum which is blinking but it is not the right. It is the Enum of the cluster "Element" ...

 

Thank you very much ! Have a nice day ! Smiley Very Happy 
 

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Visa read function byte count is N-1?

July 24, 2017, 6:16 am
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Hi,

 

I make Visa Vi.

The data is received 17bytes every 2ms second.

 

When third Visa read function byte count is 15, data is lose.

But, third Visa read function byte count is 14, data received well.....

So, Visa read function byte count is N-1?

visa.JPG

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Create checkboxes programmatically

July 24, 2017, 6:57 am
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Hello LabView Community

 

I have a 2D Array of Strings that will correspond to labels of checkboxes that need to be displayed. Is there a way to create and precheck those checkboxes programmatically? The ones that need to appear checked are in another array of Strings. To explain myself better, here there is an example

 

2D Array of Strings with the labels for the checkboxes

Strings = { Fruits [apple, mango, cherry.....], Vegetables [eggplant, tomato, potato, lettuce....], Spices [pepper, curry...] }

 

Array with checkboxes that need to be displayed checked

Strings = [apple, eggplant, curry...]

 

I will like to do it programmatically because the values of both arrays can change depending on the configuration. Thank you very much in advance for the answer.

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