nRF51 DK Sniffer, nRF52 DK sniffer - timestamp measurement accuracy

RE: nRF51 DK Sniffer, nRF52 DK sniffer - timestamp measurement accuracy

Emil Lenngren — Mon, 03 Feb 2025 10:31:00 GMT

If you open the "nRF Sniffer for Bluetooth LE", the "Timestamp" entry there is the correct one and the one you should use. You can right click on that one in Wireshark and you will find an option to use it as column in the list of packets. The other date/time columns might indicate the time the packet was received by the computer from the sniffer and hence slightly inaccurate. You can easily compare these with the raw Timestamp field to see if that is the case when you have at least two entries.

RE: nRF51 DK Sniffer, nRF52 DK sniffer - timestamp measurement accuracy

Ron — Mon, 03 Feb 2025 10:14:06 GMT

Just to make sure, the time-stamp listed on the log, is derived from the devkit actual reception time, and not from system time, or communication time?

RE: nRF51 DK Sniffer, nRF52 DK sniffer - timestamp measurement accuracy

Emil Lenngren — Fri, 31 Jan 2025 21:46:23 GMT

It follows the accuracy of the HFXO of the devkit which I guess is something like 20 ppm.

RE: nRF51 DK Sniffer, nRF52 DK sniffer - timestamp measurement accuracy

Ron — Fri, 31 Jan 2025 21:40:43 GMT

Thanks, yes, but accuracy and resolution are not always the same or similar

RE: nRF51 DK Sniffer, nRF52 DK sniffer - timestamp measurement accuracy

Emil Lenngren — Fri, 31 Jan 2025 20:40:57 GMT

There is microsecond resolution. In the metadata header of the packet from the sniffer, you can see packet start time and end time.