Dear sirs,
We are using the RTW and getting data through a set of analog channels (by using a National Instruments PCI board). After some testing, it is observed that some spikes appear in one of the received analog signals. These spikes correspond to the adjacent received channel, in magnitude. For example, if channel 3 is 0 volts, and channel 4 is getting data around 3 volts, channel 4 will get some spikes at 0 volts. This behavior is weird. We have checked that this does not happen with the program driver board. So we think it is not a hardware problem.In addition, it seems that these spikes ONLY occur when we interactuate with the computer, i.e, we move the mouse, we refresh the scope, and so on... We have also tried to change the sampling period to a bigger one to relax the computing requirements, but the same behaviour is observed. This troubleshooting also happens in another channels, for
example channel 3 get spikes from channel 2, channel 1 from 2, etc. In addition, we changed the computer with a another one more powerfull and the same happens.
The following link shows this problem:
https://www.dropbox.com/s/w5q124qib66pwe0/troubleshooting.JPG
You can see that within the interval approximately 300-680 samples the spikes do not happen (and within that range we did not interactuate with the computer). Outside that interval strange spikes occur in the pink curve, coming from channel 3, which is at about 0 volts (not showed). Ignore the yellow curve.
We are using the following versions:
7.11.0.584 (R2010b) 32-bit (Win32)
Simulink 7.6
System: windows XP sp3
How could we address this problem? Can it be related with any setup of the RTW?
Best,
-Mario![]()
We are using the RTW and getting data through a set of analog channels (by using a National Instruments PCI board). After some testing, it is observed that some spikes appear in one of the received analog signals. These spikes correspond to the adjacent received channel, in magnitude. For example, if channel 3 is 0 volts, and channel 4 is getting data around 3 volts, channel 4 will get some spikes at 0 volts. This behavior is weird. We have checked that this does not happen with the program driver board. So we think it is not a hardware problem.In addition, it seems that these spikes ONLY occur when we interactuate with the computer, i.e, we move the mouse, we refresh the scope, and so on... We have also tried to change the sampling period to a bigger one to relax the computing requirements, but the same behaviour is observed. This troubleshooting also happens in another channels, for
example channel 3 get spikes from channel 2, channel 1 from 2, etc. In addition, we changed the computer with a another one more powerfull and the same happens.
The following link shows this problem:
https://www.dropbox.com/s/w5q124qib66pwe0/troubleshooting.JPG
You can see that within the interval approximately 300-680 samples the spikes do not happen (and within that range we did not interactuate with the computer). Outside that interval strange spikes occur in the pink curve, coming from channel 3, which is at about 0 volts (not showed). Ignore the yellow curve.
We are using the following versions:
7.11.0.584 (R2010b) 32-bit (Win32)
Simulink 7.6
System: windows XP sp3
How could we address this problem? Can it be related with any setup of the RTW?
Best,
-Mario