On Thu, Mar 25, 2021 at 06:50 AM, Ozan wrote:
In this video I think I know what is happening. You have variable horizontal
knob out (time 0:13 in the video). Your 5ns B gate is 300ns wide instead of ~
130ns Raymond measured so this is supporting the theory of variable time
scale. When you switch to 10ns it is the same RC time constant as 5ns (2x is
in horizontal amp) but because variable time is disabled for B other than
1/2/5n, B-gate suddenly looks like it became shorter. If you push in the
variable time scale knob my guess is you will see 5ns width same as 10ns
width, not jumping to a smaller time. I tried it and can replicate what you
are seeing with variable time scale set.
I noticed this a few days ago, when I observed the unlocked variable timebase knob and had to fine-tune my settings in order to get exactly the screens that Ondrej showed in his video, so I wrote and suggested:
*** QUOTE ***
Gentlemen,
First of all, in order to make life as easy as possible, it would help me/us if we would "standardise" our settings:
- A-ramp at top
- A-gate below that
- B-gate below that again
- Variable timebase knob in the "calibrated" position (pushed in)
- Delay Time Position to minimum (0)
- Observation 'scope (2465B?) in non-delayed mode
- Trigger on A- gate trace
My observations match Ozan's latest ones.
** UNQUOTE **
I thought that things were made unnecessarily complex by using the delayed display on the observation 'scope and variable time base in the video.
Raymond
Raymond Domp Frank