10-31-2022 09:16 AM
I have a project where I need to log a galvanometer output that should be in the range of 0 - 125 µa.
The signal isn't fast and takes about 500ms to cover that range but often a lot longer
I have access to a cDAQ chassis and I have a budget for modules.
I'm looking for accuracy and repeatability.
What hardware would people recommend and any other suggestions would be welcome.
Solved! Go to Solution.
10-31-2022 09:28 AM
Use a Current Sense Amplifier to convert the current into a more usable voltage for a DAQ module.
10-31-2022 12:57 PM
Since you say "Accuracy and repeatability" and assuming you want some level of calibration traceability, DMM will be the obvious choice.
This is a good choice, https://www.ni.com/en-us/support/model.usb-4065.html
11-01-2022 07:44 AM
Your last three letters already point to my sugessted solution :
a TIA .. TransImpedance Amplifier 😄
the TIA has an input impedance of about zero Ohm . build with a OP and a 10 kOhm Feedback you end up in 1,25V