PT-104: precision when measuring 0.5 Ohm

 
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Andrei
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PostPosted: Thu Sep 14, 2006 8:41 pm    Post subject: PT-104: precision when measuring 0.5 Ohm Reply with quote
I want to measure specimens within resistance range approx. 0.5 ... 200 Ohm with precision of 0.25%. It looks like PT-104 is up to the task, but I am not quite sure about the measurement precision in the lower range.

Can you tell me what is the relative precision of resistance measurement at 0.5 Ohm, please?


regards,
Andrei
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Michael
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Joined: 07 Jul 2005
Posts: 93
Location: St Neots, Cambridgeshire
PostPosted: Mon Sep 18, 2006 8:27 am    Post subject: Reply with quote
Hello Andrei,

The accuracy of resistance measurement is to within 1 µΩ when using the 0-375Ω range. This will cover the range you wish to measure.

Best regards,
Michael
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Andrei
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PostPosted: Mon Sep 18, 2006 11:06 am    Post subject: Reply with quote
I am no expert on measurement theory, thus, please correct if I am wrong.

1uOhm looks more like a resolution.

RMS noise on range 375Ohm is 10 ppm, which makes 3.75 milliohm, i.e. accuracy 0.75% when measuring 0.5Ohm.

Thus, if I want to lower RMS noise to 0.25%, I have to average over (0.75/0.25)^2 = 9 measurements, which is not that bad.
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