Synchronoscopes. Technical requirements
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Frequency meter type F433 / 3. Quality requirements for certified products
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Frequency counters B80. Quality requirements for certified products
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Frequency counters B81. Quality requirements for certified products
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Single-phase phase meters D578. Quality requirements for certified products
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Single-phase phase meters D5000. Quality requirements for certified products
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Phase-angle and power-factor meters. Specification
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Frequency meters. Technical requirements
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Indicating analogue electrical measuring instruments for measuring frequency. General technical specifications
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Direct acting indicating analogue electrical measuring instruments and their accessories. Part 4. Special requirements for frequency meters
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Phase-angle and power-factor meters. Specification
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Phase-angle and power-factor meters. Technical requirements
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