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LabVIEW
UNABLE TO UNDERSTAND .LVM FILE FROM OSCILLOSCOPE TO LABVIEW 2016
@mubmeh wrote:
Hi there, i am using Labview 2016. I am getting voltage and time values from oscilloscope to labview using "write to measurement file". i am using option " X values (Time column)- one column per channel" and saving it as .lvm file
Data i am getting like following
Time Voltage
0.000000 0.500000
2.000000E-10 0.580000
4.000000E-10 0.660000
6.000000E-10 0.740000
8.000000E-10 0.820000
1.000000E-9 0.880000
1.200000E-9 0.940000
1.400000E-9 0.980000
1.600000E-9 1.040000
1.800000E-9 1.080000
2.000000E-9 1.120000
2.200000E-9 1.160000
2.400000E-9 1.200000
2.600000E-9 1.240000
2.800000E-9 1.280000
3.000000E-9 1.300000
3.200000E-9 1.320000
3.400000E-9 1.340000
3.600000E-9 1.340000
3.800000E-9 1.360000
4.000000E-9 1.360000
4.200000E-9 1.340000
4.400000E-9 1.320000
4.600000E-9 1.300000
4.800000E-9 1.280000
5.000000E-9 1.260000
5.200000E-9 1.240000.
.
.
1.194000E-7 0.000000
1.196000E-7 0.000000
1.198000E-7 0.000000
All time column have values in E-9 to E-7. I didn't understand either this time in seconds, minutes or hours. E-7 means 0.0000001....
But the actual time to save this data was more than 1 minute i believe.
Can anybody explain the format of data saved in .lvm file from oscilloscope?
Thanks
You'll have to more info, like what make/model of the oscope, and - most importantly - the code you are using to capture the data. (Or, if you are using a driver, where can we find it?)
Hi Bill, thanks for your reply.
I am using RIGOL DS1052E (DSO).
Circuit diagram which i am using is following
I used instrument drivers to find drivers for my DS1000 series oscilloscope.
Hi mubmeh,
which settings did you use for your scope measurement? What's the sample rate?
Can you show the waveform(s) delivered by your VI? Seems the sample interval is 2e-10s = 0.2ns…
Hi GredW, thanks for your reply.
Yes, i think you are right.
Oscilloscope is showing 10 ns. I tried to change it when i was running it through my laptop but it couldn't. Also, i changed time scale before saving waveform data but as soon as i connect my laptop to oscilloscope, it again automatically changes to 10 ns.
Do you think is there problem in my code which i am using?
I am new to Lab View, your little will be very fruitful for me.
Many thanks again.
Hi mubmeh,
as soon as i connect my laptop to oscilloscope, it again automatically changes to 10 ns.
When the scope changes its setting just by plugging in a USB cable then your VI isn't the problem.
When the settings change when you run the VI then it is…
You will find all needed commands in the manual of your Rigol. Compare the commands and their parameters with all settings used in your device driver VIs…
I see that maybe you are new to instrument control. Dig around the manual, then see if you can come up with a list of commands that mimic what you want to do by manually pushing buttons, twisting knobs and stuff. See if you can get it working. We're always here to help if you need it. 🙂
