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PicoScope for Straingauge sniffing :-P

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PicoScope for Straingauge sniffing :-P

Postby Meins321 » Mon Jul 17, 2017 7:39 am

Dear PicoScope Users/Support,

does any one use a picoscope for strain gauge experimenting? The input voltage/sensitivity is usally very important..

i know i wont get 1uV measured but 1mv/div to 10mV/div should be possible even with a very slow rise time...which means i need lots of memmory?

Any advice would be nice!

Greetings Meins321
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Re: PicoScope for Straingauge sniffing :-P

Postby Gerry » Wed Jul 19, 2017 4:44 pm

Hi Meins321,

Have a look at the post here: post85231.html#p85231.

Regards,

Gerry
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Re: PicoScope for Straingauge sniffing :-P

Postby Meins321 » Tue Sep 05, 2017 8:58 am

Thank you for your fast reply to my question!

I had a look at the PicoScope 4444, the specification says 12bit on the 10mV/div range.

As most industrial straingauges are 1mV/V, and 2,5V/5V/10V excitation as standard, i can get only 10mV as output voltage while applying maximum load.

Now if i put 1,12Kg on my 10Kg loadcell, the output signal should be 0,112V or 11,2mV.

Is it still possible to see fine details with an Picoscope 4444 in the micro volt range? To see what happens when i load the strain gauge only partially up.


I know there is noise, but just asking this as an experiment!
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Re: PicoScope for Straingauge sniffing :-P

Postby bennog » Tue Sep 05, 2017 5:34 pm

I have tested this with my 4444 and a 10kg loadcell, and was able to see variations of a few grams.

Don't know the exact values anymore, later this year we are testing this with 4 positions in a very noisy machine.
The plan is to use 1 or 2kg cells because they are more sensitive. I am planning to do all filtering in software.
Stream data to my application at at least 100ks / sec or even 1ms / sec and then try to make sense of all the noise.

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