I have 2 rubidium clocks which both are generating 10MHz sine wave. Some reason my system is giving bad data. So, I am deciding to inspect every single part of the system. I am trying to check the rubidium clock and make sure it have to be in nanosecond time variation, because: t=1/f = 1/10e6 = 100 (ns). I am using this oscilloscope: https://www.atecorp.com/products/tektronix/tds3034 and this rubidium clock: http://www.thinksrs.com/products/PRS10.htm Is the time variant between of 2 sine wave also known as the delay on the scope? if I say right, the time variant is display on the screen is about 38.74ns. If I say wrong, how to calculate or how to have time variation from the scope? I am not experience in oscilloscope and hope anyone can help. Thank you.