Not sure I've ever seen those options mentioned, but the minimum discernible
signal should be in the specs. The noise floor of a 49x in 100 Hz RBW is
around -125 dBm in band 1. The 8640B goes down to -139 dBm, so it may be
time to tighten up a few connectors in the 8640B if you can still see it!
(Either that, or perhaps those option codes refer to some kind of internal
preamp. Would be interesting to know for sure... Deane and Stan, have you
ever heard of those?)
I recently posted the TekScopes issue announcing the 492 for another fellow;
it's still on my web space, and will be for a few days (until I need the
space back), if you or anyone else would like to grab a copy:
It's about 12 MB, not a great scan for browsing but looks OK when printed.
-- john, KE5FX
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My 492 has mod UB and kit KE/FE installed. Would you happen to know
what those are?
What's the lowest power signal that this should be able to resolve at
minimum span, max resolution, and with the minimum noise filter
engaged and with video filtering set to narrow?
I'm asking because whatever it is, my HP 8640B won't go that low,
even at its -130dBM range with the vernier turned down all the way.
I'm impressed!
