NF C63-075:1987 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR FOR INDUSTRIAL USE. INDUCTIVE PROXIMITY SWITCHES. METHODS FOR MEASURING THE OPERATING DISTANCE AND OPERATING FREQUENCY. (EUROPEAN STANDARD EN 50 010).
1987NF C63-075:1987 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR FOR INDUSTRIAL USE. INDUCTIVE PROXIMITY SWITCHES. METHODS FOR MEASURING THE OPERATING DISTANCE AND OPERATING FREQUENCY. (EUROPEAN STANDARD EN 50 010).