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Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack
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nctnico:

--- Quote from: Wuerstchenhund on July 10, 2017, 09:50:33 am ---Nice write-up and pictures!  :-+


--- Quote from: nctnico on July 08, 2017, 12:45:09 pm ---I have been hunting for a 1GHz+ scope for over half a year. I prefered one which has a high enough samplerate to do this in a single shot. Ofcourse it is 'easy' to spend several $k on a Lecroy Wavepro 7000 series or something similar but I didn't want to spend that much and avoid too much overlap with the oscilloscopes I already have. The older Lecroy LC584 is also interesting and I nearly got one but the Ebay seller bailed out on me (I did got a refund though).
--- End quote ---
Well that's bad. But there should be plenty of similar scopes on the market.

There recently was a WavePro 950 (1Ghz 16GSa/s) for less than £1k on ebay UK (maybe it still is) but I guess it depends on what you wanted to spend.

--- End quote ---
That was one of the big questions. I have compiled a rather long list with scopes which included the Wavepro 900 series (preferably a 960) and even the Wavepro 7000 but in the end I had to be sensible and look at what unique features an older >1GHz scope would really add to my lab and the answer was: bandwidth and a noisy dog house. So I opted for a model which was relatively small, light and cheap. Spending more would mean buying features I already have. The 54835A is not going to be my daily use scope. I will only switch it on if I need the bandwidth.
Wuerstchenhund:

--- Quote from: nctnico on July 10, 2017, 10:43:59 am ---That was one of the big questions. I have compiled a rather long list with scopes which included the Wavepro 900 series (preferably a 960) and even the Wavepro 7000 but in the end I had to be sensible and look at what unique features an older >1GHz scope would really add to my lab and the answer was: bandwidth and a noisy dog house.
--- End quote ---

Oh yes, these scopes are loud, and quite large.

The small and less noisy alternative would be a WaveRunner2 LT584 (1Ghz) but they are somewhat rare (and often vastly overpriced).


--- Quote ---So I opted for a model which was relatively small, light and cheap. Spending more would mean buying features I already have.
--- End quote ---

Makes sense. I know you already have other scopes.


--- Quote ---The 54835A is not going to be my daily use scope. I will only switch it on if I need the bandwidth.
--- End quote ---

I use my DSO8064A as my main scope now, mostly because it's less noisy and a bit smaller than the WavePro 7k. What's annoying though is how expensive active probes are for Infiniium scopes, even 2nd hand.
snoopy:
Does this help ?

Jwalling:

--- Quote from: stj on July 09, 2017, 05:38:18 pm ---transfer lots of data in a single pass.

writing a shitload of stuff to a usb key will often cause the interface to hang after while.
i imagine any streaming devices like tuners will cause absolute chaos.
btw, the first intel chipsets with usb 1.0 had the bug too - it was in the design spec they where supplied with!!!
oops!  :palm:

--- End quote ---

I copied the entire contents (about 105MB)of the \ossetup directory folder to a thumb drive, then did a FC/B to compare the files. No errors. I'd say it's good enough for government work, when the most likely use is saving screenshots and such.
free_electron:
here is the clip you need to press.
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