EBME Forums Forums Maintenance Test Equipment Testing of earth resistance and potential voltages

Hi all,

The relevant AU/NZ standard (that is to say AS/NZ 3003) requires the measurement of earth bonding from GPOs to the EP point and voltage potential from any exposed metal to the EPJ in a patient treatment zone designated as "cardiac" (generally a theatre with RCDs or LIOMs). To do this requires the ability to measure very small resistances and voltages sometimes across substantial distances.
To do this we generally use a locally made EST device known as an MEM which allows a 4 wire (2 wire constant current and 2 wire sense) system (see the attached).
What I'm wondering is what do others use? The Rigels don't do this but do any other makes or is different method is known? The issue with the MEM is simply one of size not of function so I am looking for a more compact device for when I'm on the road.

Thanks all, Dave