# Which current can a multimeter measure for an indefinite duration?

It might vary, depending on multimeter.

But if on a multimeter, there is printed "10A for 30sec. MAX every 15 min" or "20A for 15 sec (time unspecified)", below which approximate threshold is the safe duration of measurement indefinite?

• It should be written on the user manual Commented Dec 18, 2018 at 12:26
• @Damien My user manuals do not mention it. Is there any approximate way to calculate that indefinite measurement current? (at approximate room temperature) Commented Dec 18, 2018 at 12:30
• There is no easy way to calculate that as it depends on many unknowns like: thermal resistance from current shunt to room, allowed temperature of shunt and multimeter etc. If the value isn't listed in the manual but you need to measure a large current continuously then 1) get a meter that does specify this value or 2) get a clamp meter, it measures the magnetic field generated by the current, so there is no power dissipating shunt resistor. Commented Dec 18, 2018 at 12:34
• or an external shunt resistor. Commented Dec 18, 2018 at 12:40