https://devzone.nordicsemi.com/f/nordic-q-a/93663/nrf52833-lfclk-accuracyHello, I&#39;m trying to measure the accuracy of the internal low frequency clock on the nRF52833 for hardware verification. I&#39;ve set it up so that an RTC generates a tick event which is then connected to a PPI which is then connected to a GPIOTE task outen-USTelligent Community 13Wed, 09 Nov 2022 14:16:56 GMThttps://devzone.nordicsemi.com/thread/394942?ContentTypeID=1Wed, 09 Nov 2022 14:16:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2b3f810c-be63-41a2-9f95-1ef7c8f7c0edKazi Afroza Sultana<p>You are welcome. Great that you have solved the problem.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/394786?ContentTypeID=1Tue, 08 Nov 2022 17:27:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8dfe63e6-c815-4309-8ea7-ae5d72cb8058aweng<p>This is the correct answer where the LFCLK needed to be calibrated first. For what it&#39;s worth, my hardware verification needed to check the accuracy of the RC LFCLK itself so using the HFCLK to synthesize wouldn&#39;t be testing the RC LFCLK. But calibrating it did the trick, thanks!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/394742?ContentTypeID=1Tue, 08 Nov 2022 14:32:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:01c9a85f-4fa8-40fc-807a-534bce375132Kazi Afroza Sultana<p>Hello,</p> <p>This inaccuracy might be related to the calibration of 32.768 Hz RC oscillator. Have you calibrated the crystal before measurement? In other way, you can try to synthesize the LFCLK from the HFCLK source to get the proper accuracy? Here is the link you can look at:&nbsp;<a href="https://infocenter.nordicsemi.com/topic/ps_nrf52833/clock.html?cp=4_1_0_4_3_1_4#concept_zhp_4vy_2q">https://infocenter.nordicsemi.com/topic/ps_nrf52833/clock.html?cp=4_1_0_4_3_1_4#concept_zhp_4vy_2q</a>.&nbsp;</p> <p>Thanks.</p> <p>Best Regards,</p> <p>Kazi Afroza Sultana</p><div style="clear:both;"></div>