On 12/14/2011 11:58 AM, gene heskett wrote:
> On Wednesday, December 14, 2011 11:47:19 AM Mark Wendt did opine:
>
>    
>> On 12/14/2011 11:10 AM, gene heskett wrote:
>>      
>>> That's great news Peter, but what does a fully stuffed 7623 weigh?  My
>>> Hitachi, which of course is not a storage type, weighs maybe 10
>>> pounds, goes anywhere. Probes won't reach?  Stick an upside down 5
>>> gallon paint bucket under it.  :)
>>>        
>> That's why the good Lord allowed Tek to invent scope carts.  And 9' long
>> probe leads.  ;-)
>>      
>
> Scope carts are ok but we haven't used the one we have in 15 years, too big
> to get between the rows of racks.
>
> 9' leads?  Those are transmission lines and there is no way to make them
> flat and high impedance w/o echos.  You have to mentally subtract the
> echo's because they aren't terminated with the cables actual impedance.
> Even 30"ers can do that to you at the frequencies I play with.  A 9 footer
> would have to have active electronics (power hungry and hot) in the hand
> piece to drive the low impedance cable, and probably a cable terminator
> hidden in the connector at the scope end of the cable.  Last time I looked
> at active probes they weren't too far from a 4 digit asking price.  Now,
> check ebay&  expect to fix it.
>    
All depends on the kind of lead you're looking for.  Your typical 
passive probe isn't dealing with that kind of stuff.  Not sure if this 
would work in the situation you're talking about but here's a Tek 1.5 
GHz active probe that's currently set at $115: #380392358070.

Mark

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