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The units are rated at 2 or 3% of full scale. That interprets to 4.5 volts off when reading 50 volts on the 150 volt scale. It could read 54.5 volts or 45.5 volts and be in spec.
That is the reason some test procedures call for reading at the upper 1/3 of the lowest possible scale. Meter non-linearity is the biggest problem for mid-scale errors. They were factory calibrated at 48 volts. They were then tested at half scale and full scale on the other ranges.
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