EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: daveyk on November 02, 2018, 07:31:29 pm
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Dumpster dived a Krohn-Hite 2200 Generator. After contact cleaning it switches and pots, it seems to work quite nice. If you trigger a single cycle of sinewave, it produces just slightly more than a single cycle. it's not much more, but it does end in with a slightly positive peak after the single cycle.
That's probably just how it is. There are a lot of pots in this thing and on that trigger board.
I tried looking for a service manual without luck. There may be a calibration for that, or where to end the single triggered cycle.
This looks so much nicer than the Wavetek 166 generators I used to use in the 1980s and 1990s. Its sinewave is beautiful and can drive 15 volts in to 50 ohms pretty well. If you set the output attenuation switch and the pot to 1 volt, by goodness, it is darn close to 1VPP!
I don't know if I will modify some of my test software to pause and ask the user (me) to set the generator signal rather than being able to control it directly. It would allow equipment versatility while the more modern stuff is out being calibrated. Anyway, it is a cool dumpster find. There was a second one in the dumpster, but I let it there (damn-it) and it's long since been to the re-cyclers. They only go for about $200 on ebay, so it probably is not worth listing.
If I'm going to keep it, I am interested in that service manual that appears to made from un-obtainium. lol
Hopefully, someone on here will have a pdf.
Thanks kindly,
Dave
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There's enough in this manual for repairs etc:
http://www.steampoweredradio.com/pdf/krohn%20hite/krohn%20hite%20model%202200%20lin%20log%20sweep%20generator%20circa%201979.pdf (http://www.steampoweredradio.com/pdf/krohn%20hite/krohn%20hite%20model%202200%20lin%20log%20sweep%20generator%20circa%201979.pdf)
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Thank you! I couldn't find anything when I binged or googled it. That is fantastic, thank you!
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I pine for the days when manuals like this were produced. Complete schematics and layouts! i have not totally studies yet, but "wow". What can I say, but "Too Cool!!" - lol.