low voltages measurement

Post any questions about our serial port products
Post Reply
Mille
User
User
Posts: 4
Joined: Tue Apr 15, 2008 10:07 am

low voltages measurement

Post by Mille » Fri Jun 06, 2008 7:36 am

I would like to measure continuous low voltages (about 0.1 mV) using the pt104.

If I connect (short-circuit) pins V+ and ground (single ended mode), I read a value around -0.02 mV, using picolog recorder.
When measuring a low voltage, the value is 0.02mV under the value given by a multimeter.
The value 0.02 mV is not really constant so that I cannot just add it to get the real result.

I have tried using the differential mode by connecting (short-circuit) pins V- and ground. The error on the value given by the multimeter is then between -0.01 mV and 0.01 mV, with high frequency variations.

What can I do to get the real value?

Thanks
Sincerely,
Francois

picojohn
Advanced User
Advanced User
Posts: 382
Joined: Mon Jun 11, 2007 1:10 pm

Post by picojohn » Fri Jun 06, 2008 10:50 am

Hello Francois,

Have you followed the connection instructions in section 2.3 of the user guide http://www.picotech.com/document/pdf/pt104.pdf?

Regards
John

Mille
User
User
Posts: 4
Joined: Tue Apr 15, 2008 10:07 am

Post by Mille » Mon Jun 09, 2008 6:24 am

Hello,

Yes I did ...

Francois

picojohn
Advanced User
Advanced User
Posts: 382
Joined: Mon Jun 11, 2007 1:10 pm

Post by picojohn » Mon Jun 09, 2008 12:48 pm

Hello Francois,

If you could send the .plw file from this setup to support@picotech.com for my attention, then I will take a look.

Regards
John

Post Reply