Safety of transformers, reactors, power supply units and combinations thereof. Part 2-26. Particular requirements and tests for transformers and power supply units all for saving energy and other purposes
State system for ensuring the uniformity of measurements. State special standard and state hierarchy diagram for variable pressure measuring instruments in the range of 1x10 in 2 degree to 1x10 in 6 degree Pa for frequencies of 5x10 in minus 2 degree to 1x10 in 4 degree Hz, durations from 1x10 in minus 5 degree to 10 s under constant pressure up to 5x10 in 6 degree Pa
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