28 May
2010
28 May
'10
6:15 p.m.
I wrote:
Note that most oscilliscopes that have a Z input use
capacitive coupling
on that input, which is generally not very useful for a computer (or
videogame) display
Randy Dawson wrote:
Hey Dan,
Wasn't Dan that posted that, it was me.
what?
Never in my life saw that, Z is always DC, specified as positive signal decreases
intensity. Tube will stay dark all day long with voltage applied, its not cap coupled.
I've seen many scopes with AC-coupled Z-axis inputs; they were more
common than DC-coupled, though usually the high-end scopes (e.g., Tek
465) had DC-coupled Z-axis.
Quoting from _Oscilliscopes: How to Use Them, How They Work_, 5e, by Ian
Hickman, p73:
Some oscilloscopes have dc coupling of the /Z axis/ input, but
/ac coupling/ is much cheaper
and therefore more common,
Eric