"A thing of beauty is a joy forever"
The 8640B (shown 'locked') and the 9025 are both referenced to an external GPS-disciplined oscillator whereas the Meteor drifts from +4Hz to +28Hz error when the display is active (presumably from the non-TC internal HC6U crystal warming up as more power is consumed)
(re. 9025 ... Mark Hennessy, take a bow
)