02-24-2014 01:23 PM
Hi ,
Do NI have a Digital In module with High Impedance (390K) or more
Input Voltage 0-50V
Like dSpace DS4004 digital Input Line
I find only 4mA input current , it is to high for the ECU application. (Open circuit detection)
Thanks
02-24-2014 06:23 PM
Can you run it through a buffer, like an op-amp, that offers zero gain but an extremely high input-Z?
I've had to use an op-amp as a voltage follower to raise the input-Z from a photodiode before running it into the low-Z input on the DAQ. Works well if the slew rate is acceptable.
02-25-2014 08:00 AM
OK ,
Thanks I thought about this solution
But I need to built a PCB or Proto before a NI card
NI don't provide direct HIGH impedance DIN solution
02-25-2014 11:01 AM
Hello Boutch19.
I sent you a PM to talk further about your applications and your needs for you to be contacted by one of our sales engineers. They will be glad to assist you and give you further orientation.
Warm Regards and best of luck with your application,