tag:blogger.com,1999:blog-26385730250380897.post4634728070633480009..comments2024-02-26T16:02:17.461-05:00Comments on Reading Jim Williams: Book 1 Chapter 7Doctor Analoghttp://www.blogger.com/profile/10331958951440669259noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-26385730250380897.post-28454061806849284882011-11-21T17:33:04.782-05:002011-11-21T17:33:04.782-05:00Little historic tidbit (worked for HP T&M, lov...Little historic tidbit (worked for HP T&M, love tech history and friend with the then-HP, later-Agilent corporate archivist): the 200A and 200B were discontinued only because the bulb used became unavailable so a tweak was made to allow a different, available one. The nonlinear characteristic of the bulb (and its temperature coefficient) was pretty essential and not just any incandescent lamp apparently would do.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-26385730250380897.post-26350121047595026252011-09-29T09:44:22.415-04:002011-09-29T09:44:22.415-04:00I am the proud owner of an HP200CD wide range osci...I am the proud owner of an HP200CD wide range oscillator, courtesy the MIT Flea, which I recently got out and tested as part of re-activating my workshop (dormant since the birth of my first child in 2000!). <br />I snagged it pretty much as a result of having read that chapter.<br /><br />It still works, and looking at the output (on an Agilent MSO!) I was amazed at how it held the output amplitude to within a few tenths of a volt from the lowest to the highest frequency range. I was also amused to watch the feedback response -- it seems that the filaments of the light bulbs respond slowly enough that you can see it happening.lightning bulb (aka ngvrnd)https://www.blogger.com/profile/16809379864442430402noreply@blogger.com