Rigol DS4000 10 MHz Input Ref Issues
https://www.youtube.com/watch?v=B-eec6O0PS4A look at the challenges and issues with ensuring that the 10 MHz reference input signal on the Rigol DS4000 is working correctly.
https://www.eevblog.com/forum/testgear/help-with-rigol-ds4014e-on-10mhz-external-ref/?allI also take a look at an ovenized crystal oscillator (OCXO) and demonstrate how sensitive they can be to temperature changes, and shock. I look at the internal crystal oscillator drift / calibration of the following instruments on my bench:
* HP / Agilent / Keysight 58131A frequency counter
* Aim TTi TF930 frequency counter
* Aim TTi TG2511A function / frequency generator
* Fluke 164H multifunction / frequency counter
* Fluke PM6685 universal frequency counter