https://devzone.nordicsemi.com/f/nordic-q-a/80665/nrf52840-direct-test-mode-carrier-frequency-tolerance-failureHi, We got carrier frequency tolerance failure in a certification test. The max deviation should be under 20ppm, but the result is above 30. We used DTM example in nRF5 SDK v16.0.0. Is there any modification I can do to reduce carrier frequencyen-USTelligent Community 13Fri, 22 Oct 2021 09:33:09 GMThttps://devzone.nordicsemi.com/thread/335436?ContentTypeID=1Fri, 22 Oct 2021 09:33:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4ebfe352-216b-4228-9bfb-cf32bef07ad3irarykim<p>Hello Bendik,</p> <p></p> <p>We tried as you said and found a better capacitor value! Now we are waiting for the result from certification lab. I will close this ticket after it is resolved.&nbsp;</p> <p></p> <p>Thank you.</p> <p>Jason</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/334158?ContentTypeID=1Thu, 14 Oct 2021 12:47:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:eb0f55c3-d630-4a7b-9cb5-ac33c7012bd3Bendik Heiskel<p>Hello Jason,</p> <p>A large deviation in carrier frequency is a result of a incorrectly loaded 32MHz crystal.To correct this the values of the load capacitors must be changed.</p> <p>We have a white paper that outlines the crystal oscillator design considerations: <a href="https://infocenter.nordicsemi.com/pdf/nwp_015.pdf?cp=17_14">https://infocenter.nordicsemi.com/pdf/nwp_015.pdf?cp=17_14</a></p> <p>&nbsp;</p> <p>Best regards,</p> <p>Bendik</p><div style="clear:both;"></div>