ISO 17657-2:2005 specifies a welding current meter with a current sensing coil to measure the weld time and the r.m.s. value of the welding current during a certain interval using single phase alternating current of frequency of 50 Hz or 60 Hz, or direct current.
BS EN ISO 17657-2:2006 history
2006BS EN ISO 17657-2:2007 Resistance welding. Welding current measurement for resistance welding - Welding current meter with current sensing coil
2006BS EN ISO 17657-2:2006 Resistance welding - Welding current measurement for resistance welding - Welding current meter with current sensing coil