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Took apart my Tektronix DPO4034

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Mechatrommer:
hmm ok thanx. the heatsinks tell the story, not the usual rigol thing.

scopeman:

--- Quote from: alm on November 20, 2010, 02:21:49 pm ---Thanks for the pics. Maybe the moisture sealant is to keep leakage low, so it lasts longer on the lithium cell?

--- End quote ---

The moisture sealant area is to keep moisture and humidity from affecting the RTC and crystal for the time of day clock. Even a pF or so can change the frequency of the oscillator or cause it to stop.

Scopeman

tinhead:

--- Quote from: allanw on November 20, 2010, 03:37:39 pm ---I wonder what the chips marked 7SB42 D9DCG are? There are 8 on my scope, but there's enough lands for 16. This must be the ADC's, because the DPO4000 series goes from 2.5GS/s sampling to 5.0GS/s.

There's a total of 12 of them, in groups of four, scattered around the top of the board. Maybe it's for the MSO models with 16 digital lines?

--- End quote ---

my theory : probably only "bank memory" chips, for 5GSs you will need second one "big" custom BGA soldered between these two Tek custom chip (without heatsink), so in principle two 2.5GSs ADCs,
each with 10M sample memory but together still "only" 10M memory but 5GSs.

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