Electrical apparatus for explosive gas atmospheres. Part 1. Construction and verification test of flameproof enclosures of electrical apparatus. First supplement. Appendix D. Method of test for ascertainment of maximum experimental safe gap
State system for ensuring the uniformity of measurements. State verification schedule for measuring instruments of alternate electrical voltage to 1000 V in the frequency range from 1-10 in minus 2 degree up to 2-10 in 9 degree Hz
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