Hello Harvey,
?????? Though my own 54522C is actually stuck out of work by some failure to initialize properly (described in previous posts), I have a wide experience using these scopes. Once, I got "jitter" at any sweep speed, and it came out to have a magnetic induction origin. The cathode-ray display tube is not shielded agins magnetic fields, and inductions are liable to occur from outside or inside fields. Moving the scope cures the first ones, but inside inductions are worst to avoid. Mine came from the supply, since they vanished when putting it away from the scope (need a elongated connection). These magnetic fields are weak on new supply units, but become more and more noticeable when aging. A way to partly confirm this origin is to look at the 3 lines message displayed on the screen when "key pressed booting" : it should be horizontally perfectly stable without jitter. If not, magnetic fields or some trouble in H amplifier final stages are to be sought for.
You may try that way befor looking to the tricky circuitry of horizontal amplifier final stages which drive the deflection coils. As already mentionned, the ripple on +/- 12 Volts line might be involved too. Of course, all above does not apply to newest series with a LCD display !

???????????? Good luck,
???????????????????????????????????????????????????????????????????????????????????????????????? Jean-claude


Le 07/02/2016 06:50, Harvey White madyn@... [hp_agilent_equipment] a ???crit???: