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assign offset to signals present in a group of channel

Hello everybody,

 

I'm opening EDF file (1 hour of recording of EEG signal from 16 channels) with OPEN DATA STOREGE instrument present in LabView and

it's ok I can open it and I can see on the graph. The only problem is that all the signal have the same offset. It's means that in the graph

I see the signal super imposed. I'd like to be able to decide the offset of everysingle channel (the number can change during the experiment).

By using matrix I did in the way i show you in the image below but with with EDF file it not possible becase if i try to "convert" the tipe of probe

to be able to use the matrix instrument the program say the file is to big.

Thank for helping me.

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Message 1 of 8
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Hi,

 

can you send your VI? From the posted image I am not able to completely understand the issue.

 

Regards,

A.

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Message 2 of 8
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Hi,

 

here you can find two VI.

The first one (Off-Set signal1) is what I created to work directly with EDF file.

In the second one I used the array to set the offset.

As you can see the secon solution is easyer but unfurtunately I cannot use it with all my file.

I need to use directly the EDF format (blue line). Can you figure out a better method to

set the offset directly in edf signal?

thank you. 

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Message 3 of 8
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Hi,

 

try working on multiple y-scale, directly on the graph. You can do this editing the front panel graph object or programmatically from the block diagram

Please see attached images

 

duplicateScale.png

 

assignChannel2Scale.png

 

graphProperties.png

 

modifyScaleParameters.png

 

 

Regards

 

A

Message 4 of 8
(2,439 Views)

Thank for replying, but in my LabView I have no way to select multiple amplitude

for the Y axis. I'm using LabView 2010. Do you know if I need an upgrade to use that function?

 

Best

 

G.

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Message 5 of 8
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Sorry....I think i find what you suggest....wonderful.

Thank you again........Smiley Wink

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Message 6 of 8
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Hi there...sorry...again me.

I was wrong...even if i can duplicate the Y scale i cannot follow the next step you suggest me.

If I right clic directly on the graph the Y scale option is not avaible (it's there but I cannot clic on).

if I change the off set of the graph property pannel it's seem nothing happen. I think the offset is modify put the

signal on the graph are still not separeted.

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Message 7 of 8
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Hi,
In the 2nd step you have to left click on each signal legend on the top right corner of the graph (you Can expand it, showing The right number of channels!
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Message 8 of 8
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