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| Strain Gauge 8.3 × 10⁻⁶ Impossibleness - How? |
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| David Hess:
--- Quote from: armandine2 on March 24, 2023, 01:36:51 pm ---see chapter 12 page 194 for analog strain-gage design example - Precision Platform --- End quote --- That is a fast settling design. The analog filter time constant is slowed after the initial change in weight to remove additional noise, so the slow time constant of the filter does not extend the settling time. --- Quote from: amyk on March 24, 2023, 03:41:10 am ---Here's the specifications of one 60-ton truck scale: https://acmescales.com/catalog/industrial-products-mettler-toledo/industrial-products-mettler-toledo-truck-rail-scales-mt/mettler-toledo-vtc190-truck-scale-2/ 10000 increments of 12lb, so basically 4-digit accuracy - easily reachable with a 16-bit ADC. --- End quote --- 16 bits or slightly less is realistic because in practice accuracy is limited to perhaps 1 in 20,000 because of mechanical considerations with the load cell and strain gauge mounting. In the past it was also tough to minimize drift in the signal conditioning and achieve 16 bit *accuracy* in the ADC, but that may be considered an inexpensively solved problem today, albeit still not intuitive. The mechanical aspects of the load cells and strain gauges still have a lot of art to them. |
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