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That's right. On the 2246, the pre-regulator 44 VDC needs the inverter circuit to be functioning correctly to get to a stable 44 VDC because of the Q2008 feedback from the inverter FET Q2214 Drain

I would add -- Tim was kind enough to send me one of his prototypes so I could use it to make a mold, and compare my castings from his prototype vs. an original foot that Tom Jobe sent me. I owe both

I bought some and they work great. I plan on posting some pictures, but have not got around to it. Tim's Email address is; lemonscentedmoisttowelette@... George

I'm interested also…. 6 connectors???…. to make 3 extenders…. solid pcb inside the scope, then wire outside i think…. shielded microstrip inside to smb panel mouts, then smb coax to socket…

Yes that's right. Inductor L2206 limits dI/dt and helps to collapse the voltage across T2205. I have just a few different 7000 'scope types. You may well be right there. The surprise for me was that

On the 2230 which uses the same basic design, the preregulator output is fixed. On the 2246, it looks like Q2208 adjusts the preregulator output to keep the same voltage across the switching

I saw him offering those on ebay along with the handle endcaps. they look very nice. Search for tektronix feet and it should come up. -- Paul Amaranth, GCIH | Rochester MI, USA Aurora Group, Inc. |

wrote: Isn't the 2246 inverter design just another variation of the saturable core oscillator with T2205 designed to saturate before T2204? I see the same configuration in the "good" 22xx series (2230

You are right. At first sight I thought that the 44 V would be regulated independently always to that value, but it's not. This also destroys my argument that the sum of saturation voltage and FET

I think if the designer was concerned about the switching time, then they would have used some sort of active saturation control like a Baker clamp. I would be tempted to

No, there's no 608C manual there, only a Service Note. I have a photocopy of a 608C manual; if you still need it, contact me off-list and I'll scan it as time permits. Dave Wise

Hi Dave, The 150ps versus 200ps difference is in my view only the result of the better RF-environment of the new relais(design) in the 015-0611-00 Pulse Head. I have both BNC Pulse Heads (311-01 and

There is something strange about those switching transistors. I just looked in more detail in the 2232 manual. There the base resistors are 33 Ohm (!) but still 0.2 W (!). Same transistors,

<daviddigiacomo@...> wrote: The difference in noise between the 7A19 and 7A29 should be there (maybe about 30%) but it will not amount

Isn't that just due to the termination on the 7A19? Have you tried putting a good inline termination on the 7A26? Anyway, I haven't noticed a difference in trace noise between the 7A19 and 7A29.

The switching transistors are rather cold than anything else. I put an heatsink on each of them for the peace of my mind.... You can put your fingers (be careful!) anywhere with no feeling of

The 2246 has an active protection circuit with a feedback loop that monitors the Drain voltage of the FET and keeps the heat dissipation of the FET under check. The FET also has a huge heat sink.

I have a few 7A19 plug-ins over and above what I need. Contact me off list if you are interested. Dave

Hi all, I have a 7904A with a 7A19 plugin (plus lots of slower ones, e.g. 7A24 and 7A26). I'd love to have two channels of > 500 MHz, and I'm contemplating if I should chase another 7A19 or get two

On 01/03/2013 11:57 AM, Dave C wrote: > > I read occasionally that owners of T&M equipment tire of the noise a cooling fan makes and asks for help to determine if/how a quieter replacement can be