Truck Scales, Load cells, Truck Scales Software.
NTEP is the US pattern approval for equipment used in trade. Who issues the Certificate of Conformance, which NIST handbooks it is checked against, and what counts as commercial use.
OIML sets the model regulations behind load cell accuracy classes and weighbridge approvals. What the organisation publishes, how its certification systems work, and what to check on a supplier’s certificate.
What each line on a load cell datasheet means and what it costs to get wrong: rated capacity, accuracy class, resolution, rated output in mV/V, the error figures, and the two overload limits.
A bench or floor scale showing the wrong weight is usually not broken. Work through the symptom, run the four-corner test, and decide whether corner adjustment will fix it or the load cell needs replacing.
No display, no menu: the SP-DIII and SP-DIV are set up by holding one key at power-up and reading what the printer prints back. The timing matters.
A conversion board turns a conventional analog load cell into a digital one. Terminal assignments on both sides of the board, the boards available per protocol, and the 12 V DC rule.