resample multisim data

[234123410324]

Hello,

I am facing a problem while trying to resample some multisim data so that they can be inserted to LabView 7.1.

I am using the resample multisim data.vi  and the data i try to resample are on a .txt file in Multisim format.

The data are read from the .txt file but the resampling is not happening.

On the 2 graphers i have the following:

Is it the data format wrong?

The data are coming from simulating a two stage amplifier  in multisim and are in the following format (.txt file content):

---- Page: "Oscilloscope-XSC1"
---- Graph:
---- Left Axis: LINEAR "Channel_A Voltage(V)"
---- Top Axis: LINEAR
---- Right Axis: LINEAR "Channel_B Voltage(V)"
---- Bottom Axis: LINEAR "Time (S)"
---- Trace: 1 LEFT BOTTOM "Channel A"
0.000000000000e+000    0.000000000000e+000
1.000000000000e-004    5.922348744636e-001
2.000000000000e-004    1.129712892369e+000
4.000000000000e-004    2.092170264748e+000
8.000000000000e-004    3.431907017104e+000
1.600000000000e-003    4.069643836434e+000
2.641151320367e-003    3.886740992002e+000

...

...

...

1.054222006550e+002    4.695912073889e+000
1.054322006550e+002    4.132278334812e+000
1.054422006550e+002    3.552336381005e+000
1.054522006550e+002    2.958374978411e+000
---- End Trace: 2 "Channel B"



---- End Graph:
---- End Page: "Oscilloscope-XSC1"

---- Page: "DC operating point"
---- Chart: Operating Point
DC Operating Point   
$9    0.00000
$6    2.40382
$5    6.43175
$13    0.00000
$11    1.38015
$12    1.72519
$4    2.40382
$8    1.20763
$7    1.72519
$1    15.00000
$3    6.43175
vv1#branch    -3.93115m
---- End Chart: Operating Point
---- End Page: "DC operating point"

[234123410324]

no ideas?

[_user32]

Did you try the resample data vi with only a single waveform?  I am guessing the VI is not indexing the waveform information and therefore it is parsing the data incorrectly.

Regards,

Patrick Noonan
Business Development Manager
National Instruments - Electronics Workbench Group
50 Market St 1-A
South Portland, ME 04106
Phone: 207 892-9130
Email: patrick.noonan@ni.com 

[234123410324]

Following your instructions, i tried to run the VI with one waveform only.

Im afraid the result is the same.No resampling.

i cannot spot the error...

[234123410324]

...

This is what i have this far,on the zipped archive.

If anybody please can spot the error! I can't...

Thanks in advance!

[_user32]

234123410324,

Ok I've found the issue.  The VI you are using "resample.vi" is reading in a spreadsheet file with time (x) in the first column and the waveform data (Y) in the second column - it is basically using the "Read From Spreadsheet File.vi" which does not expect headers or any formatting other than raw data values.   On your Multisim files you can extract the X (time) and Y (waveform) data without the headers and save into a new txt file for processing.   Both the basic 2 ch scope and the Grapher have header information.   The LabVIEW program could be modified to parse out the header information.

Probably a better way to solve this problem is by using the following example and saving the data in LVM format:

http://zone.ni.com/devzone/cda/tut/p/id/16

or here:

http://zone.ni.com/devzone/cda/tut/p/id/6140

When you use this capability, the export to LVM format automatically resamples/interpolates the waveform data from the scope as needed with the desired delta-t.

Also when you use the Multisim API (via the LabVIEW toolkit), you choose the resample/interpolation method and the data is also reformatted into sampled data (unless raw mode is selected).   I have recently posted some sample VIs to show this:

http://decibel.ni.com/content/docs/DOC-7438

Regards,

Patrick Noonan
Business Development Manager
National Instruments - Electronics Workbench Group
50 Market St 1-A
South Portland, ME 04106
Phone: 207 892-9130
Email: patrick.noonan@ni.com

[_user32]

Hello,

I created an example VI and a PDF describing how to do this.

http://decibel.ni.com/content/docs/DOC-8017

Regards,

Patrick Noonan

National Instruments