electromyography EMG

[kmous]

Good morning , this is an EMG program that i found at 3:00 pm this morning 🙂 I am trying to run it (did not connect the hardware) just to see what's going on !!! it gives me an error Duplicate Path , try to run it and see , is that my output file ? i saved it on my c:\ ...but did not work actually !!
thank you for ur help

[Dennis_Knutson]

I can run the VI and not get that error. For a file name, I just used c:\emg.txt. You will need to determine which function is generating that error.

[kmous]

I am running the VI and i am getting an error , i will attach the error !! is it something to do with the create function ?

[Dennis_Knutson]

The error is pretty obvious. It would seem you have a cDAQ board that only supports a differential configuration and the Create Channel is specifying RSE. You can change the DAQmx Create Channel but I have no idea how you've done the wiring to the sensors or what type of sensors you have. I would recomend you review the section on field wiring in your user manual for the DAQ device.

[kmous]

Hi , I found the problem , I was not connectiong to the right channel !!! :S
what do u know about EMG filter (lowpass/highpass/bandpass/bandstop, low cut-off, high cut-off).
what's the difference ?
and btw how can i display  2 channels at the same time on my graph ? let's say i am measuring 2 EMG signals !!! and i wanna set my channels bu default to be DaqMod2/ai0 and DaqMod2/ai1 and i choose one of them or both any idea ?
i will attach the VI's.

[Steve.J]

Typically EMG is recorded using a bandpass filter with the low filter setting (high pass) at about 1Hz and the high filter (low-pass) setting at 100Hz or higher depending on what your sampling rate is and what you are trying to accomplish.  For gross EMG activity, the settings are not critical.

[kmous]

how can i display  2 channels at the same time on my graph ? let's say i am measuring 2 EMG signals !!! and i wanna set my channels bu default to be DaqMod2/ai0 and DaqMod2/ai1 and i choose one of them by true/false or both any idea ?
i will attach the VI's.

[Dennis_Knutson]

The code you posted does have the physical channel control set for two channels. If you want to use different ones, click on the little arrow on the right side and then select 'Browse'.

[kmous]

ya i know but i wanna use my channels like cDAQ3Mod2/ai0 and cDAQ3Mod2/ai1 !!!

[Dennis_Knutson]

So what do you see when you select 'Browse'? You should see all available channels. Do you know that you can use Ctrl-Click or Shift-Click for multiple channels? Thats' the same thing you do in windows explorer to select multiple files.