# Multifunction DAQ

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## Measurent of 125 µ amps (125 micro amps)

Good day,

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.

TIA

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## Re: Measurent of 125 µ amps (125 micro amps)

Use a Current Sense Amplifier to convert the current into a more usable voltage for a DAQ module.

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## Re: Measurent of 125 µ amps (125 micro amps)

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

Santhosh
Soliton Technologies

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## Re: Measurent of 125 µ amps (125 micro amps)

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

Greetings from Germany
Henrik

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