StimJim Isolator (beta version is out) - problem with compliance voltage
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William Anderson
Feb 10, 2022, 10:16:31 AM2/10/22
to Open Ephys
Hello Open Ephys forum,
I am putting out a beta version of the StimJim_Isolator program for Windows. The StimJim_Isolator program is free and open source.
The StimJim_Isolator controls the StimJim stimulator to act like a stimulus isolator. One input pulse from a data acquisition program triggers one isolated biphasic current or voltage pulse from the StimJim. Pulse voltages and currents can also be automatically incremented.
I have found only one major fault with the StimJim. When using the TWO channels IN SERIES and in the CURRENT mode, the compliance voltage for a 100 us pulse is not 27.4V as stated in their bioRxiv paper, but only 13.7V (see also Sections 3.3.6, 3.12 and 3.13 in the manual). This means that a 100 Kohm stimulating electrode can only output a 100 us pulse with a maximum of 137 uA rather than the stated 274 uA, which is significant.
It would be interesting to see what others have found about this fault, and what their electrode resistances were, and the maximum current they injected.
Once this discrepancy is resolved I will put verson 1.00 program and code in BitBucket also. I can be contacted at sup...@winltp.com.
The StimJim_Isolator package (program, code, manual, and a compiled version of Nate Cermak's stimPulserClient.py) can be DOWNLOADED from winltp.com/StimJim_Isolator.html.
Sincerely,
Bill Anderson
I am putting out a beta version of the StimJim_Isolator program for Windows. The StimJim_Isolator program is free and open source.
The StimJim_Isolator controls the StimJim stimulator to act like a stimulus isolator. One input pulse from a data acquisition program triggers one isolated biphasic current or voltage pulse from the StimJim. Pulse voltages and currents can also be automatically incremented.
I have found only one major fault with the StimJim. When using the TWO channels IN SERIES and in the CURRENT mode, the compliance voltage for a 100 us pulse is not 27.4V as stated in their bioRxiv paper, but only 13.7V (see also Sections 3.3.6, 3.12 and 3.13 in the manual). This means that a 100 Kohm stimulating electrode can only output a 100 us pulse with a maximum of 137 uA rather than the stated 274 uA, which is significant.
It would be interesting to see what others have found about this fault, and what their electrode resistances were, and the maximum current they injected.
Once this discrepancy is resolved I will put verson 1.00 program and code in BitBucket also. I can be contacted at sup...@winltp.com.
The StimJim_Isolator package (program, code, manual, and a compiled version of Nate Cermak's stimPulserClient.py) can be DOWNLOADED from winltp.com/StimJim_Isolator.html.
Sincerely,
Bill Anderson
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