Measurement microvolt

3 posts / 0 new

Thu, 01/14/2021 - 01:44

Hi there,

I would like to use a T7 Pro to measure microvolt signal from a sensor. As I am not an expert in data acquisition I am looking for some advise on how to get the necessary measurement accuracy.

In the sensor specification the mentioned requirements for the measurement capability are preferably < 5 x 10-6 V uncertainty. The minimum requirement is: 20 x 10-6 V uncertainty.

Please can you advise which components I need to purchase besides the T7 Pro to allow sufficient measurement resolution?

I already apologise if I have missed any relevant information :)

Thanks and best regards,

JH.

Fri, 01/15/2021 - 17:15

LabJack Support

The T7-Pro has built in

The T7-Pro has built in amplification and high enough resolution that you should be able to get microvolt range resolution without additional accessories.

There are two settings you will need to consider to maximize resolution: Gain/range and resolution index.

You want to select the highest gain setting where your signal does not exceed the voltage range of the setting. Assuming your signal of interest cannot go outside of the range -0.01V to 0.01V you can use the highest gain/range setting of x1000/+-0.01V.

If your sampling speed does not matter, you simply choose the highest resolution index for your device. On the T7-Pro you can use resolution index 12. See our noise and resolution table on this page:

https://labjack.com/support/datasheets/t-series/appendix-a-3-2-2-t7-nois...

You would be able to easily setup your analog inputs in the analog inputs section of our Kipling software. See our software options page:

https://labjack.com/support/t7-software-options

Accuracy is different from resolution and the best accuracy you can expect from the T7 is +-20uV at the x1000/+-0.01V range. See this application note:

https://labjack.com/support/app-notes/resolution-and-accuracy

See our analog input specs here:

https://labjack.com/support/datasheets/t-series/appendix-a-3-2-1-t7-gene...

Tue, 01/19/2021 - 18:03

Thanks for the swift reply.

I have a Labjack T7-Pro on order. Once received I will try to directly connect and take it from there. If there are any remarks or questions I will get back to you.

Thanks again,
JH.