About "Write LabVIEW Measurement File" Expres vi. I got problems with ENABLE function
It is a traditional DAQ problem. I acquire some data and I want to write it on file only if voltage value is greater than a constant value (I used "Comparison" Express vi to do comparison). This mean that enable must depend on the result of comparison. I dont want to write unuseful data. What happens is that if the last scan is greater than the threshold, all data is written; if the last scan is smaller, all data is not written.No matter if intermediate scan result is zero or one.
Attachments:
My_Data_Processing2.vi 423 KB
pulse.lvm 4 KB
There may be a bug in the comparison VI. I experimented with simple waveforms (0,0,1,0,0) and (0,0,1,0,0,1). I used the greater than with a cut off of .5. I also set the VI to output one answer for the entire sample.
I saw that the VI outputed 0 for both data sets. When I used the property page to invert the input, both sets outputed 1. I believe that if you just inverted the output of the comparison VI, you will be fine.
Similar Messages
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How to name columns in "Write LabView Measurement File" Express VI
Hello, I am inputting two signals into the "Write LabView Measurement File" Express VI, and although the data is recorded correctly, there is no separate header for all the y-values (I only get the X-value column labeled: X_Value), and then there is a "Comment" field right next to it. How do I name these y-value columns so that the header appears alongside the X_Value tag? Thanks.
I don't want to read from a LabView measurement file. I'm saving in a file; that's good enough. I just need to save it in headed columns. Any suggestions?
Here's a test of the program with two random data inputs, and a picture of the output.Message Edited by Doagie on 06-13-2005 01:22 PM
Message Edited by Doagie on 06-13-2005 01:22 PM
Attachments:
1.bmp 218 KB
2.bmp 405 KB -
I have a problem with a pdf file which does not open with reader in windows 8 but it opens properly with adobe pdf reader. All other pdf can be opened in reader.But when i open a pdf(see this link for pdf for which i got error http://incometaxsoft.com/temp/Form.pdf)
it gives error as "Can't open this file. There's a problem with file format".
The same file opens properly in adobe pdf reader.You can check the pdf file which i have mentioned in the link above.But the reader which comes with windows 8 can open some other pdf in the same PC.What may be the error causing this??This has turned out to be an enormous issue for me as I sell PDF files as ebooks. I have done a fair amount of investigating this for my system.
My files have to be compatible not just across readers but across operating systems.
To date, I have over 200 PDFs that have functioned flawlessly across Mac, PC (Windows 7 and below), Android, iPhone/iPad, Linux.
I personally test my PDFs using a variety of readers and PDF editors including
PDF XChange (my favorite)
Foxit (runner up for me and I recommend for most people)
Adobe (the bloated monster)
Nitro 9 (great for moving graphical elements around)
ABBYY
And the Nuance PDF Create toolsets
Those are off the top of my head. There are a bunch on Android that I test with too.
I am running the Windows 10 Pro Tech Preview and I have this same problem so I know it isn't fixed yet in any kind of pre-release way (-sigh-)
Here is what I've learned for my situation
The PDFs I created using NUANCE'S PDF CREATE PROFESSIONAL VERSION 8
all fail using the built-in Windows 8/10 PDF reader.
When I look at the PDF properties for these Nuance created files, the underlying engine used to write them is called "ImageToPDF". Using ABBYY it indicates their own engine as does everyone else that I've tried. It is easy for you to check to see
what created your PDF by doing a "Control D" (look at the document properties). Perhaps there's a common engine causing issues.
If I use the exact same source files to create a PDF using any of my other tools I have no issues. I checked the PDF versions made by the tools and they are all set to 1.5.
A customer mentioned being able to convert them in a way they worked by saving them without having to do any kind of extraction, but I have not been able to duplicate that. Perhaps he did a "print" which seems like it could work.
In summary, the workaround everyone is talking about, using an alternate reader, of course works. But not everyone wants to change.
The culprit I have found is my Nuance PDF Creation tools that are using the ImageToPDF engine.
I hope it gets FIXED as I really don't want to have to regenerate all of my PDF files. -
Improving Write to Measurement File Rate
Hello again everyone,
I was wondering if I could once again get some help with my VI which is dealing with data aquisiton, display and logging. I'm attempting to display and record all the data that is incoming serially from some external ADC boards. The data is received at 500Hz and I am trying to currently record this through the use of Write to Measurement file, however i'm finding that I am not recording all the data that is captured into the file. When I tested this code I found I was only getting a recorded sample rate of about 3Hz... I'm looking to reach at least recording the data at 50Hz minimum, however i'm having trouble figuring out how.
I currently have a global loop with a delay of 100ms, however reducing this increment did not noticeably increase the rate at which the data is recorded. I suspect it is due to the time taken to carry out everything within the loop, however I don't know how to improve this, using a different structure perhaps? If someone could take a look at my VI and give me some pointers on how to improve the cycle rate that would be awsome.
Also, I find that the display is quite laggy in displaying the incoming data. Again this wasn't improved by changing the delay in between the loops or selecting the synchronous display option. The delay in inputing data at the ADC and seeing the result on the screen was somewhere around 1 second!
Any help would be greatly appreciated as I don't know how to sort this problem out.
Thanks in advance!
Stirling
Attachments:
Serial read v2.2.vi 136 KBHi Stirling,
I don’t think it’s a problem with the Write to Measurement
File.vi. You need to have a look at the VISA Read.vi. You are reading 5K at
every iteration of the loop and that could probably be causing the delay. A
great way to troubleshoot this would be to turn on highlight execution.
Also, you should consider using the Array to Cluster.vi and
the Convert to Dynamic Data.vi in the Write to Measurement File.vi block. This
shouldn’t effect anything; just a suggestion to take advantage of LabVIEW functions.
Adnan Zafar
Certified LabVIEW Architect
Coleman Technologies -
System time in Write TO Measurement File
Hi, everyone. I'm Sorin.
I use a DAQ 6210 in Labview 8.2 to aquire some analog data at 1 sec,and i have 2 questions, please:
1. I need to record the data into a file .lvm, so i use "Write TO Measurement File" module with one column of time (X axe). But this time is relative, and i want to be system time instead. Is there any way to resolv that ?
2. Also, in my Waveform Chart i put absolute time because i couldn't find system time, though i need it. How can i change that ? Although, once i played with charts, and i succeeded to see system time, but now i can't. And i'm sure it wasn't complicate.Hi Sir
I had similar problem. I tried to write to a measurement file with absolute time, instead of relative time here I got.
Also, I want the format to be sth like this 13/09/25 18:16:01.
Could you help me?
Thanks
LabVIEW Measurement
Writer_Version 2
Reader_Version 2
Separator Tab
Decimal_Separator .
Multi_Headings No
X_Columns Multi
Time_Pref Absolute
Operator FriedmanLab
Date 2013/09/25
Time 14:09:10.2151017189025878906
***End_of_Header***
Channels 1
Samples 1
Date 2013/09/25
Time 14:09:10.2151017189025878906
X_Dimension Time
X0 0.0000000000000000E+0
Delta_X 1.000000
***End_of_Header***
X_Value Untitled Comment
0.000000 21.787387 Enter a description
10.000572 21.847446 Enter a description
20.001144 21.841562 Enter a description
30.000716 21.908628 Enter a description
40.001288 21.902826 Enter a description
50.004860 21.963112 Enter a description
60.035434 21.967730 Enter a description
70.031005 21.968933 Enter a description
80.011576 22.039718 Enter a description
90.000148 22.065121 Enter a description
wei shen
Attachments:
Untitled.jpg 74 KB -
Problems with write to measurement file
My VI doesn't seem to write my signal properly when writing is enables.. however, if i change the "Write to measurement file" Express VI to a Write to Spreadsheet function, the signal is written correctly. From what I understand in previous discussions, there is a bug associated with enabling a write to measurement file, so is there a way to enable write to spreadsheet instead of using the express VI or is there a way I can bypass this bug?
Thanks,
TFlax
Attachments:
Analog test and collection.vi 700 KBThis is my second program ever written, first in matlab, so I am very new to the field. So why I choose one way over another I have no reasoning, all I know is that it works. I am collecting electromyography analog signals, with a range of +/-5V.. the "bad" writing with write to meas file is that I am getting a flat signal (range between -.01 to +0.01, give or take).. where when written with write to spreadsheet, the signal has proper voltage range and normal frquency and amplitude characteristics seen in EMGs.
I tried using a case structure for the write to spreadsheet, however it only writes the buffer size during continuous sampling. I need it to write the entire time the boolean (enable button) is true, also the enable button is operated as switch when pressed.
The discussion about the write to measurement file: http://forums.ni.com/ni/board/message?board.id=170&message.id=454380
Thanks again -
Write to measurement file help
Hi,
I am a beginner. I am working on a VI.
But have some problems that I couldn't solve.
Here is the VI attached, I get on the output the positive and negative peak values which I then write to a mesurement file.
But now I just get my last values of positive and negative peak in the measurement file.
But I there were different values before that last values also. I want to save all the values, or every time that values changes on postive and negative, I would like to save all values to a file.
Would be great if someone can help me with it.
Regards,
Raj
Attachments:
VI_HELP.vi 103 KBIf you did the TDMS file your self (not use the express VI). Then you could specify the group to write into and the channels. It sounds like you want to add new channels each time you acquire a set of samples. Look in the example finder (Help->Find Examples) for TDMS Write Triggered Data.vi. It looks like a decent example to get you started.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines -
Attach labels for write to measurement file and graphing
I am currently having alot of problems with attaching labels to double type of wires and changing the label attached to the dynamic type of wires. I want the write to measurement file to have the correct headings but the current headings for the columns are displaying untitled or change the heading for the dynamic type of wire. I attached a picture of the program and I would be very grateful if anybody knew how to change these headings.
Try this VI I made. It takes in a Double signal and a string, names your signal, and outputs it as a Dynamic Data.
I used this with the Write to Measurement File without any issues!!!
To name a Dynamic Data Signal, use the Set Dynamic Data Attributes VI found in Express > Signal Manipulation
Hope this helps,
Cheers
Attachments:
Name DBL Signal VI.png 59 KB
Name DBL Signal for Measurement File.vi 35 KB -
Bdc upload file data into internal table problem with gui_upload fm
Hello experts,
my coding is like this ..
data : begin of itab occurs 0 .
field1 like mara-matnr,
field2......
etc,
end of itab.
data: file1 type string.
parameter :file like rlgrap-filename.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR file.
CALL FUNCTION 'KD_GET_FILENAME_ON_F4'
EXPORTING
static = 'X'
mask = space
field_name = 'FILE'
CHANGING
file_name = file.
START-OF-SELECTION.
FILE1 = FILE . "HERE I AM PASSING INTO STRING
CALL FUNCTION 'GUI_UPLOAD'
EXPORTING
filename = FILE1
FILETYPE = 'ASC'
has_field_separator = 'X'
TABLES
data_tab = itab. " here the data is not populating from the file , it is giving the error like speified table not found.
HERE i am getting the message like "specified table name not recgonised" . the data is not populating into the itab from the file.
file structure is same as the internal table.
I stored the file as .txt( ie in notepad).
my file is like this..
10000 200 323 sunndarrr.......
i had a problem with this bdc , i am getting like "specified table name not recgonised" in the fm gui_upload while debugging.
when i am using the ws_upload it is working fine.
please guide me where i have done the mistake.
thank you so much for all the replies.Hi,
Have a look on the following code.
TABLES: kna1.
DATA: BEGIN OF itab1 OCCURS 0,
str(255),
END OF itab1.
DATA: itab2 TYPE kna1 OCCURS 0 WITH HEADER LINE.
CALL FUNCTION 'WS_UPLOAD'
EXPORTING
filename = 'D:\ABAP EVE\ffile1.txt'
filetype = 'ASC'
TABLES
data_tab = itab1
EXCEPTIONS
conversion_error = 1
file_open_error = 2
file_read_error = 3
invalid_type = 4
no_batch = 5
unknown_error = 6
invalid_table_width = 7
gui_refuse_filetransfer = 8
customer_error = 9
no_authority = 10
OTHERS = 11.
IF sy-subrc <> 0.
WRITE:/ 'sorry'.
ELSE.
LOOP AT itab1.
SPLIT itab1-str AT ',' INTO itab2-kunnr itab2-name1.
APPEND itab2.
ENDLOOP.
IF sy-subrc = 0.
LOOP AT itab2.
WRITE:/ itab2-kunnr,itab2-name1.
INSERT INTO kna1 VALUES itab2.
ENDLOOP.
IF sy-subrc = 0.
WRITE:/ 'inserted'.
ELSE.
WRITE:/ 'not inserted'.
ENDIF.
ELSE.
WRITE:/ 'fail'.
ENDIF.
ENDIF.
Flat file:
10001,Sadney
10003,Yogesh
20005,Madan
1.U need to define internal table with one field of max size
2.upload the flat file data into that internal table
3.split that internal table data into another internal table(having fields)
<REMOVED BY MODERATOR>
thanks,
Chandu
Edited by: Alvaro Tejada Galindo on Apr 30, 2008 12:17 PM -
I got problem with installing with files ended *.bin
Due to some problem I had to format and reinstall the MAC Tiger on my come. I followed all the process properly. Everything was seem ok when the installation proccess finished. Then I went to yahoo to download yahoo messenger and that;s when the problem come. The file I download ends with .bin and the comp keeps opens it with QuickTime. I also have same problem with downloading MSN. How can I solve this prob?
Try downloading an installing Stuffit Expander which is not included with Tiger.
http://www.apple.com/downloads/macosx/systemdiskutilities/stuffitexpander.html -
Has anyone experienced problems with downloading Nikon D800 files to the iPad3 using the camer connector kit? I have tried .RAW and JPEG (of various sizes) on both SD and CF cards, but the iPad doesn't recognise the files.
I have seen various forums discussing Lightroom and PSE updates that are required to process .NEF files but I can't find anything on the iPad/camera connector issue.
I dont have any problem if I put the SD card straight into the SD slot in my iMac and Aperture will process the files fine, but I would really like to be able to download and view files on the move on the iPad.
Any advice appreciated?
PS - saw something that suggested the iPad had a maximum file size of 16mb for photos, not sure if this is correct, but I have tried smaller JPEG files and they still aren't recognised.If your camera supports both PTP and Mass Storage Device modes, it may be necessary to use both modes to import all media content.
If some files do not import as expected using one mode, try switching to the other mode and importing again.
Note: Some cameras may refer to PTP as Pictbridge or PTP/Pictbridge. -
When I place express 'write to measurement file' I get an error
'Error in prop page construction:
Control Label: Streaming
Couldn't find control/constant on the instance.'
Help!!!!!
Please.
Regards
DerekThe error happens as soon as I place the symbol. The symbol is there and the properties are all accessible, but will not run.
I enclose word doc with error messages on.
Many thanks in anticipation
Derek
Attachments:
LabviewA.doc 86 KB -
Extending decimal points on timestamp for write to measurement file .vi
Hello Everyone
Currently I am collecting a bunch of Fieldpoint Channels in LabVIEW (about 190) which is a lot of instrumentation. Right now we want to be sure the computer can keep up and read all of the channels every second. To test this theory I want to use the WTMF to get a timestamp for every channel (seems to be the easiest way).
While reading the file I get like 5.68 so two decimal places. I was wondering if there was a way to get a more accurate time reading down to the millisecond. I know this is three places after the decimal point, but I was hoping I could extend this to 5-6 places past the decimal point.
Usually when saving data I use the write to spreadsheet with one time column and can just format the readings through that, but for some reason I cannot figure this out with the WTMF
If there is any input to check these time differences besides doing the above, that would also be appreciated.
Any input would be amazing.
Thanks so much
TanyaHi vaib,
as i said already here, http://forums.ni.com/ni/board/message?board.id=170&view=by_date_ascending&message.id=332115#M332115 i think you can´t stop the writing process. If you start them, then you have to wait til the vi is ready. To measure the time you can use the "Tick count" function. See the attached picture.
Mike
Message Edited by MikeS81 on 06-17-2008 03:34 PM
Attachments:
Unbenannt1.PNG 12 KB -
CRIO write to measurement file
I have been searching for a solution like mad but I have not found one yet.
I am using a cRIO-9002 with the cRIO-9215 card.
In regular labview one can create a signal generator and use the "write to measurment file" function and a nice file is created so that data points can be plotted versus time.
Now once I try to do this in a Real Time VI for some reason the file never gets created. I can not figure out why.
The whole point of this operation is to take accelorometer data from an inflight RC helicopter but I am using a signal generator to simulate an input for the accelorometers. I am including code just in case someone what to take a look.
I am also open to any other solutions you might have.
This should be a simple task but I can't seem to get it to work.
Thanks in advance,
Anthoney Pennington
Attachments:
cRIO data capture.zip 158 KBHi Carsale,
I tested out a really simple vi using Write to measurement file.
Double click on the express vi.
I simply directed the path to C: (root directory of the controller)
You can then FTP to it by specifying its IP address ex: ftp://10.0.35.160/
Hope this helps
Van L
NI Applications Engineer
Attachments:
Untitled 12.vi 77 KB -
Does write to measurement file need a blank file?
Do we need to supply a blank file to write to measurement file? I am supplying a file with some text headers in it to my Write to measurement file, and for some reason it generates Error 100, saying that it is "not a path". I am not sure, if I need to supply a blank file or not. Also, is it possible to get rid of the headers that write to measurement VI itself generates in the file, and supply my own headers instead?
Thanks.Please stick to your original post, where you are already being helped on this issue.
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