Certification test at 8dBm

[bonnet]

Hello

  Most of the time we shall use the BT TX 0dBm. In special cases when we want to increase the communication distance we may select the 8dBm mode.

For RF type approval test, should we perform the tests at 0 or 8dBm ?

Is there a risk to have spurious only at 8dBm ?

If we perform the tests only at 8dBm do we cover the spectrum at 0dBm ?

What is your recommendation ?

Thank you

[WestCoastDaz]

bonnetIt's best to test at the maximum power because you can easily turn it down after you have your certification without any retesting. The  FCC/CE tests record the maximum transmit power used during testing so you can't legally increase the output power past what was tested.  We always test our devices at +4dBm (we are using the nRF52832 at the moment) and we haven't had any issues with spurious emissions but in the end it comes down to the design.