10-08-2015, 06:30 PM
You've all got a bit ahead of me due to my current decrepit state 
I'm getting there, honest.
Yes, there's no doubt that there are shortcomings with both High and Low Bandwidth Scopes. As with all Instrumentation it's best to think about what you're really measuring. I wish we still had SPCh, RIP.
Mark, it's a long time since I had dealings with tint low Bandwidth Signals, and even then I was never sure what I was looking at. I guess the Tek. Scope of choice would e the 5100 series, like this :-
I've got a couple which sadly don't get much use. Apparently there's a Plugin which is good for 10uV/Cm but I haven't got one - http://w140.com/tekwiki/wiki/5A22N I bet that takes some driving.
Anyway, back to the matter in hand.
I've tried to take Pictures of the beginning and end of the Trace, plus the Sweep and Gate Signals.
Sorry about the first Picture, but honest, it doesn't start cleanly. The odd thing is that as the Gate Signal doesn't go High until after the Sweep has started - it's much longer than the Retrace - I'd expect the Start to be 'Clean'.
I don't expect it's of any great consequence but I think I'll have a look at those High Value Resistors round the Gate Input. By the way, they're x10 Probes so they're quite hefty signals and I shortened the Leads to the Minimum I could manage.
Alan
I'm getting there, honest.
Yes, there's no doubt that there are shortcomings with both High and Low Bandwidth Scopes. As with all Instrumentation it's best to think about what you're really measuring. I wish we still had SPCh, RIP.
Mark, it's a long time since I had dealings with tint low Bandwidth Signals, and even then I was never sure what I was looking at. I guess the Tek. Scope of choice would e the 5100 series, like this :-
I've got a couple which sadly don't get much use. Apparently there's a Plugin which is good for 10uV/Cm but I haven't got one - http://w140.com/tekwiki/wiki/5A22N I bet that takes some driving.
Anyway, back to the matter in hand.
I've tried to take Pictures of the beginning and end of the Trace, plus the Sweep and Gate Signals.
Sorry about the first Picture, but honest, it doesn't start cleanly. The odd thing is that as the Gate Signal doesn't go High until after the Sweep has started - it's much longer than the Retrace - I'd expect the Start to be 'Clean'.
I don't expect it's of any great consequence but I think I'll have a look at those High Value Resistors round the Gate Input. By the way, they're x10 Probes so they're quite hefty signals and I shortened the Leads to the Minimum I could manage.
Alan
