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  • EEVblog #430 – Fluke 91 Scopemeter Teardown

    Posted on February 27th, 2013 EEVblog 11 comments

    Teardown Tuesday.
    Inside a 1994 vintage Fluke 91 Series II Scopemeter.
    Extended commentary on PCB Wave Soldering

    Service Manual

    Photos HERE

    Forum Topic HERE

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    10 responses to “EEVblog #430 – Fluke 91 Scopemeter Teardown” RSS icon

    • Unfortunately PCB wave soldering video is private.

    • Why is the wave soldering video is private?
      If this get published twice it’s my computers fault it stutters sometimes

    • Isn’t the Fluke scopemeter orginally from Philips? Then made in Holland seems logical.

    • Good work!

      Did you noticed the dual footprint on the memory chips?

      The ADC’s datasheet says 40MHz *minimum*. Maybe Fluke was hand picking and overclocking their chips. If you have the time, scope the clock inputs (pins 16 and 17 of the TDA).


    • The 50MHz of the spec is the bandwidth and TDA8703 has less than 20mhz bandwidth, and bandwidth is something that you cant overclock… is like an rc filter on the input of the ADC… So i think to posibilities
      1) they colect ADC from the production line with better characteristics…. (and also they overclocked them)
      2) i think the most possible…. The unknown custom chip is an analog sampling memory chip that it has 50MHz ΒW and high sample rate maybe 100MSPS or even more and afte the sampling the TDA8703 reads the samples… Also thats the reason why there is not a fast memory chip ( and counter or asic) or fifo near the tda8703.
      That is not something unusual… I think most low end tektronix oscilloscope use this technique… (and thats why they have small sampling memory like 1K) i dont remember the model that has a sampling rate of several 100MSPS or even 1GSPS using analog sampling memory (asic) and then reads the samples with an mc10319 (25msps adc)

    • murata ref is a BNX002-01.

      > 40dB (1MHz up to 1GHz)

    • Dave ! test it to 50 MHZ !!

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