EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: abeyer on November 04, 2018, 02:29:47 am
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Given all the caveats about buying an old analog scope...
Does $250USD seem like a reasonable deal on a 7903 with what seems like fairly decent modules installed? It's local, so will pay some sales tax, but no insane shipping charges. Seems pretty in line with ebay pricing, but willing to hear opinions.
edit: added currency
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The R stands for Rack: http://w140.com/tekwiki/wiki/R7903 (http://w140.com/tekwiki/wiki/R7903)
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If it works that seems very reasonable for a 500MHz scope. Typically I figure on about $1/MHz as the going rate for an analog scope in average working condition.
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Oh yes, the 250$ are allready for this setup.
For the 7A24 you need 1M probe,
for the 7A19 you need 50 Ohm probe.
It is the 19" version of the 7904, but only 3 slots, not 4.
One of the best 7k, the 500MHz are reality.
Later you can look if you need for additional plugins, 7A22 diff is nice, also the 7D14 frequency counter.
Known problems : electrolytics in PSU and tantal.
greetings
Martin
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The 7A24 is 50 ohms also. The 7A26 was normally the fastest 1M vertical amplifier.
Not only is the mainframe 500 MHz but the CRT is unusually sharp and bright making it desirable even at lower bandwidths.
The 3 bay R7903 would normally use the 7B92A dual timebase however any of the faster 7000 timebases will work. The older and slower 7000 timebases will still work but cannot display the triggering edge because the vertical delay line in the 400 and 500 MHz 7000 mainframes is not long enough.
I bought my 7904 just to get the included 7CT1N curve tracer plug-in but it has become my most used 7000 mainframe.