SECUTEST 0701 / 702S with test panel AT3 for measuring extension cables
When using the safety tester AT3 and tester SECUTEST 0701 / 0702S you should check extension cables in switch position SK1.
The safety-relevant measurements Protective conductor resistance and insulation resistance are tested via the SECUTEST 0701 / 0702S - the passage of the cable with the switch position mains via the lamps in the AT3 safety tester.
Although there is also an area for extension lines in the AUTO switch position, this is only intended for use with EL1.