Hello Robert,
Here is a general purpose op-amp based comparator schematic for multiple channels:
There are many choices for Op-Amp selection. LM741, LM747 (dual LM741) are just a couple. A quick Google search for "General purpose Op amps" will return a good selection.
Here are a couple links to app notes you may find helpful:
https://www.edn.com/using-an-op-amp-as-a-comparator-here-is-what-you-need-to-know/
https://edn.com/wp-content/uploads/AN-849.pdf
User's manual for the USB-3114: https://www.mccdaq.com/pdfs/manuals/USB-3114.pdf See page 14 or 23 for pin out.
For information on how to program the USB-3114 using the Universal Library, https://www.mccdaq.com/pdfs/manuals/Mcculw_WebHelp/ULStart.htm
From Hardware Reference, click Analog Output Hardware >> USB-3100 Series. the library function to output a User defined value is cbAOut()/AOut()/a_out() for Win32, .NET, or Python for windows respectively.
The above information is by no means complete. Measurement Computing offers suggestions only for additional circuitry. It is the User's responsibility to verify the design of provided circuitry.
Regards,
Jeffrey
Hello Robert @Montelius,
Unfortunately no, as the documentation states the USB-1616HS-BNC can only be analog triggered using the first channel in the scan.
Thinking outside-the-box, you could set up some number of op-amps, configured as comparators (one for each analog channel you want to use), with each comparator's threshold set to your desired value, wire OR the outputs together, and connect that output to the digital trigger input. In this way you can satisfy your multi-analog input requirement.
To control the thresholds programmatically, you could utilize a USB-3114 (16 analog outputs https://www.mccdaq.com/pdfs/manuals/USB-3114.pdf)
Regards,
Jeffrey
