On Fri, Jan 17, 2025 at 06:41 PM, Sigur?ur ?sgeirsson wrote:
I really should look at doing the transient calibration on my 2467 now as
my GAS (Gear Acquisition Syndrome) has left me in possession of both a
home-made tunnel diode generator and e.g. an S52.
(Home made) tunnel diode generators obviously need very careful physical layout with minimal dimensions and preferably, checking and adjusting with a fast (sampling) 'scope.
In my experience, S-52's obviously have a fast (spec. is 25ps max.) rising edge but not such very nice flat behavior immediately after it: Spec. is -7%,+7% with max 10%pp within the first 1.8ns after the step. For its purpose (TDR), where only the edge speed counts, this was irrelevant. Leo Bodnar's pulser, which as I just found out is no longer being produced BTW, shows about -3%, +3% under/overshoot.
When putting my first TD pulser together, I was lucky enough to have S-2, S-4 and S-6 sampling heads in a Series 7000 Tek mainframe at my disposal. They mostly agreed and after quite some tweaking, the signal ended up being pretty fast (< 200ps) and flat. I'm talking about mm-size tweaks to get there.
I think for many here the journey is the reward.
It certainly has been for me, which is a wonderful thing when acquiring dozens of 'scopes.
Raymond
Raymond
Raymond Domp Frank