SI5351 frequency setting

[holdenweb]

I have a fairly well-calibrated oscilloscope

The 'scope tells me that when I set the frequency to 455kHz I actually get a signal at 455.139 kHz.

To obtain what the 'scope tells me is a 455kHz signal I have to set the frequency at 454.861 kHz.

Is there some standard calibration procedure I can apply, or do I need to recalibrate my'scope?

[davefes]

What Oscilloscope are you using? Has it got a built-in frequency counter? Displaying 0.001KHz suggests it has. If the oscilloscope has an any sort of frequency reference I'd be surprised that it was that much off-frequency.