3. Ohmmeters for measuring continuity

3.1 Measurement conditions prescribed by standards

• As far as electrical installations are concerned, NF C 15-100 standard, chapter 612-2, recommends using a current greater than or equal to 0.2 A with a supply voltage of between 4 and 24 V DC. For its part, standard NF EN 61557-4-44 specifies that the measurement range must comprise at least the 0.5 to 3 Ω range and that, in this area, the operating error must be less than 30%. The error limit considered here is the statistical uncertainty; this involves not only the intrinsic error, but also any variations caused by influencing...