I am using three shimmer daughter boards to measure EMG activity of 3 different muscles in LabVIEW using "Four shimmer write.vi".
One of the daughter board is not giving EMG signals, while others are working perfectly.
i separated the "faulty" daughter board, checked it separately on single muscle using shimmerconnect v2 but the problem persists. i checked the same "faulty" daughter board for accelerometer and it is giving appropriate (seemingly correct, comparable with other shimmer devices) out puts. the EMG output plot is varying to a very little extent with contractions whereas similar muscle (with similar activity) is showing proper variations with other shimmer device.
I m not sure whether it is problem with shimmer device or what, as shimmer device is working fine for accelerometer but not giving any data for EMG. i checked the connector cables from electrodes to shimmer device but they are fine (in fact i used the same cables and muscle and replaced the shimmer device for verification).
data file created by this "faulty" shimmer device contains proper time stamping and corresponding amplitudes and number of these data points is same as observed by other shimmer daughter boards (when connected to 3 muscles). the problem is with amplitude. maximum amplitude that this device is giving is 0.012 mV and at the same time, other devices are giving maximum data value of 0.912 mV.
any kind of help / support will highly be appreciated.
This is hardware issue. it cannot be handled at customer level.
one can also experience such problem during battery exhaustion. all connectivity will be there but one may experience no communication of sEMG signals. so, whenever one experience such problem, first check with battery, then go for some other options.
From experience, i came to know that there are few places (connections) where dust and rust is accumulated. This thing severely disturb the device performance. It is highly recommended to clean your device after 1 year, with any of the alcoholic metal cleaner.
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