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Compliance testing help

Ondrej Meca

Hi,

We want to send our pre-production ready product for compliance testing. Selected testing laboratory told us "Conducted sampls should be set in continuous transmit mode and have fixed frequency software in it".

We do not have experience with direct nRF radio access (via NRF_RADIO) and low level BLE protocol so it is hard for us to implement that continous transmit mode. Another problem is that we do not have spectrum analyser so we can not test what we will do with NRF_RADIO. We went through radio_test and radio examples but without analyser we can not be sure what is happening.

Can someone explain what continuous transmit mode and have fixed frequency is and point us to what to do ?

Thanks for help

Ondrej Meca

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  • +1

    Everyone uses the radio_test example for compliance testing. Continuous transmit just means high duty rate. Normally this is inferred as 98% or higher. It is not that testing can not be done at low duty rates it is just that the time required required to complete the test goes up exponentially with low duty rate signals and your lab will charge a fortune to test at low duty rate.

    Most compliance testing is done on the lowest, highest and middle frequency of the band in question. 

    radio test provides for a uart interface so you can put the dut into different test modes. However, a uart connection can be inconvenient and may cause an increase in spurious response. So your lab will likely allow you to send multiple, identical, dut’s each with a custom version of radio test set to a different mode and/or channel.

    radio_test can be found in the SDK and the code is easy to read.

    here is the info center link: infocenter.nordicsemi.com/index.jsp

Reply
  • +1

    Everyone uses the radio_test example for compliance testing. Continuous transmit just means high duty rate. Normally this is inferred as 98% or higher. It is not that testing can not be done at low duty rates it is just that the time required required to complete the test goes up exponentially with low duty rate signals and your lab will charge a fortune to test at low duty rate.

    Most compliance testing is done on the lowest, highest and middle frequency of the band in question. 

    radio test provides for a uart interface so you can put the dut into different test modes. However, a uart connection can be inconvenient and may cause an increase in spurious response. So your lab will likely allow you to send multiple, identical, dut’s each with a custom version of radio test set to a different mode and/or channel.

    radio_test can be found in the SDK and the code is easy to read.

    here is the info center link: infocenter.nordicsemi.com/index.jsp

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