USB 6002 to read high differential voltage

[DKFF]

Hello,

I'm trying to use USB-6002 to measure currents (read voltage over a 0.1 ohm resistor and convert to current). The problem is that input voltage is about 16V (USB-6002's spec is +/- 10V). Would it work if I use differential voltage read (differential voltage across the resistor is small, like 50 mV)?

Or do I need to use voltage divider to lower the voltage to below 10V to make it work even with differential reading.

Thank you for the help.

[marcelmorin]

Hey,

Even though the difference between the voltages you will be measuring across the resistor is small, the input range of the USB-6002 terminals still needs to be in the range of ±10V.

You will need to lower that voltage with a voltage divider in order to properly use the USB-6002 device.

[tnn]

Hello,

It's mean you need reading current around 160A, i think you need a current sensor, like:

https://verivolt.com/shop/product/isoblock-i-zf-714?category=13

Regards.

[crossrulz · Accepted solution]

I recommend using a Current Sensing Amplifier (such as a TSC103IPT) with your 0.1 Ohm resistor.  The amp will convert the differential voltage into a single ended and gain it up to fit within your voltage range.  Just apply your scale properly in DAQmx to convert back into Amps.