Today the Pulse Gen come to live, after replace the weak Q100 transistor by selected from what ever transistor I have in my shop..the winner was a npn switching "MPSH10".
The rise time seems to be right on my unfinished to cal high frequency response 2465B scope..paradoxical..I brought this Gen in order to Cal my scopes ..now I haven`t a calibrated scope in this high impulse picosecond domain..to test this Gen..a dog chasing his tail!!!
The only I can do is an act of "believe" in avalanche physic & Tek circuit implementation.
As you people warning early, make an extension transmission line from common RG58...work but the pulse is not flat, the decay near linearly along his width..about 80ns.
Any suggestion about how to make/obtain 15 feet of very good coax cable??? .
Also please could any one post a pic on what is expected to see on a 2465B once connected to this Gen, about rise time and flatness?.
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--- In TekScopes@..., "iglesia_cristiana_arpas_eternas" <iglesia_cristiana_arpas_eternas@...> wrote:
The Generator arrive today from USA to my Argentine door!!! .
Unfortunately not work fine.
Rt=1,67nS (instead 300pS)
Width pulse= 5,84nS (wave exponential decay instead rectangular pulse)
Max out= 3,5V (instead 25V)
Rep Rate=15Mhz (instead 50 or 100Khz)
The ratio of different att step, seems to be good.
Probability arise that my previous intuition about bipolar avalanche transistor burned out come truth.
Perhaps the out pulse I see is not else than the trigger pulse passing trough a short avalanche transistor.
Any way, this nice generator will be fixed (tomorow)....all kind of help & advice will be welcome.
Gabriel...from the Holly land of Francisco Pope!!..God bless all of Us.
--- In TekScopes@..., "iglesia_cristiana_arpas_eternas" <iglesia_cristiana_arpas_eternas@> wrote:
Here the link to this almost new pulsed generator, at first glance is a
transmission line pulser with 300ps ..but no model or number at all.
I just brought it with the hope work right...but a good service manual
will be very appreciated and gratefully.
Link to Pulse Gen.
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2112187?autorefresh=true&pt=LH_DefaultDomain_0&hash=item3a7e99ce3b&nma=t\
rue&si=w4%252BkkAkTYIq9sTkPYLC8H98HEpU%253D&orig_cvip=true&rt=nc&_trksid\
=p2047675.l2557>
Regards Gabriel.
