Hello
I have got a question regarding the low impedance mode on multimeters like the Fluke 289:
The manual of the Fluke 289 states that it has an input impedance of 3kohm in the low z mode and it can go up to a 1000V. But if i measure for example 1000V, there will be a current flow of 333mA through the meter at 3k according to ohms law. But 0.333A at 1000V leads to a power dissipation of 333W. That is quite a lot of power to dissipate inside a multimeter.
So how exactly does the multimeter handle the current flow? Is there a detection feature which switches to the usual 10Mohm impedance if the voltage does not drop down like in the case of ghost voltages?
Greetings,
Phoenix