TDMS file edited
Hello world! How can I replace some some raw data in a PDM file and ensure that it can be read through tdms_read.vi? I tried to edited by excel, but after changing data, it cannot be registered as a xls file.
You can not manually modify the tdms instead, you can write a small VI to read the content and then modify and write again.
Tags: NI Software
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The API OR-SCOPE doesn't have the ability to record data acquired directly on the disc like the DAQmx API offers. All data must be retrieved from the on-board memory, which makes data transfer OR-SCOPE kernel driver via DMA, and a copy must then happen to transfer data from the space of the kernel in user space (LabVIEW), how it can be manipulated.
The main reason for this flow is because the calibration scale occurs in the NOR-SCOPE driver and not the material. So if you were to save data directly to the disk as DAQmx, he stock raw ADC codes, without correction calibrated. The API OR-SCOPE allows to recover the coefficients of scale if you want to apply them at a later date after extraction of the data from the hardware. To optimize flow of data applications, it is recommended.
The only exception to the logging directly on the disk would be the Oscilloscope Reconfigurable SMU-5171R. It is being implemented with LabVIEW FPGA firmware using the design of Instrument libraries, code is open for editing. With the open nature of this software stack, it is possible to implement "direct to TDMS" functionality with LabVIEW FPGA Read region node.
I hope this helps!
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Opening of TDMS files larger than 500 MB in LabVIEW
Hello
We were faced with a problem when opening files TDMS connected using a LabVIEW, PDM Viewer (the vi in palette Advanced TDMS) application, or by creating a new PDM vi player. The recorder app is built using TDMS functions in palette file.
When the TDMS files are everywhere higher than 500 MB or the application hangs or crashes. It can sometimes give full error memory.
I browsed the forum and found the screws to split large TDMS files into smaller files and then open them. The other option is to use NI DIAdem. Currently, we use the option of the tiara. We do not want to modify the application to split the files into smaller sizes.
I'd like to understand why this is happening for files of these formats. I can easily play TDMS of 100 or 200 MB files.
The configuration of the system plays a role in the present? How is it that DIAdem can open the file and cannot LabVIEW?
request explanation
Thank you
Freelance_LV wrote:
[..]
What I want is to know if upgrade to Win 7 and LV 64-bit will solve this problem, without cut it files each time, or use the TDMS vi Viewer.
More likely since the channel data is placed in a very wide range and fragmentation of memory makes it very hard on 32 bit with LV 32-bit OS. Another thing that could be a problem on your 32 bit LV: display data as it creates a copy of data. So maybe the original data of the channel can hold in memory, but tries to display it sweeps away memory.
Another thing for 32-bit applications is to check the largest block of data you always free. Use tools like VMMap for your request of fragmentation of memory snapshot.
As I wrote already, a generic application 64 bit triggers the limited "insane" values depending on the operating system like Windows 7... still, there are limits.
Norbert
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