I’m a new owner of your EMF-390 meter.
I’ve noticed an issue: the screen backlight appears to affect the RF measurement results.
I placed the meter on the ground, set the units to µW/m², and covered it with a metal pot. When the screen backlight is on, the RF reading jumps from around 1 to approximately 25 µW/m². After 30 seconds (which is how I’ve configured the display timeout), the backlight turns off, and the reading becomes more stable, remaining around 1 µW/m².
It seems that the screen backlight is interfering with the RF measurement. I haven’t yet tested the other functions of the meter, so I don’t know if they are affected as well. Please check it in yours device. |