John Miles wrote:

The fly in the ointment is that scopes typically don't have very high
bandwidth (more than a few MHz) in X-Y mode. The X-axis amplifier
section of even a relatively-fast analog scope like the 2467 is only
rated at 3 MHz, and you'll probably get significant phase shift long
before that point is reached

-- jm

For sure, you shouldn't use an analog scope for this, for the reason
John gives. In an analog scope, both the vertical amplifiers and the
vertical CRT deflection system are optimized for speed, but the
horizontal aren't. Even if you use identical amplifiers for X and Y, the
horizontal CRT deflection structure will limit the X bandwidth, and give
you considerable phase shift well below the cutoff frequency.

Modern digital scopes, on the other hand, should work equally well on
the two axes.

Roy Lewallen, W7EL