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July 21, 2017 at 4:06 pm #4670
uRADMonitor
Keymaster

Reading high values without the mic connected is normal in some circumstances. The middle point of the PCM signal would produce a 0 on noise level, but that is not the case with the mic removed we can sometimes be situated at the bottom of the PCM signal, approaching us to a maximum noise value.
Even so, your noise level data doesn’t seem right. It might be a problem with the microphone, it might be a problem with the amplifier, I can’t tell. We would need to arrange shipping the unit back so I can have a look at it.