PC motherboard: CLK signal amplitude 250mV

[ankeakala]

Any common, known issues that could cause such? Frequency is correct, it's just that the signal amplitude is presumably way out of range, and shifted to higher voltage level.

[ankeakala]

And after probing a working motherboard, this seems to be perfectly normal. Who would've known.

[shakalnokturn]

How's the probing done?
Is this a differential clock line?
It may well be normal, have you checked the datasheet for whatever you're probing (PLL output)?

[StillTrying]

It looks like you're probing 46Mhz with the scope probe on X1 and the scope's 20MHz BW limit on.

X10 and the 20MHz BW off would give a much closer amplitude value.

[ankeakala]

It looks like you're probing 46Mhz with the scope probe on X1 and the scope's 20MHz BW limit on.

X10 and the 20MHz BW off would give a much closer amplitude value.

A X10 probe has the effect of reducing capacitance by a factor of ten.

OK now it makes sense Looks somewhat closer to the expected values