From: email@example.com (Tom Bruhns)
Subject: Re: need help using spectrum analyzer
Date: 31 Oct 2002 22:18:10 -0800
NNTP-Posting-Date: 1 Nov 2002 06:18:10 GMT
"Norm Waterston" wrote in message news:...
> I just purchased a used HP141T with plug-ins. Although it didn't have
> manuals, I was able to obtain some military technical manuals, but these
> seem more suited to maintenance than actual use. There is an operational
> section, but unclear, at least to me. I'd just like to get stated using the
> analyzer. Are there any places on the web with tutorials?
So...a good place to start is to simply connect the input to a source
of some interesting spectrum within its range, and have a look at it.
Signals with modulation are generally interesting, whether it's AM or
FM modulation. I would think most of the knobs would be fairly
self-explanatory, if you have the general concept of spectrum analysis
down. Most of the knobs are used to set things like frequency span
and center frequency on the horizontal, and the scaling and gain on
the vertical. I work on much newer analyzers than that, so I'm not
sure what all it has in the way of display options...modern ones
generally can display the spectrum in various units like linear or log
(dB), and spectrum or power spectral density (power per unit
bandwidth), but I doubt the 141 series can do very much along those
We have a few applications notes but they tend to emphasize the
advantages of digital spectrum analysis. I'm not sure they'd do you
much good. But you might try poking around the Agilent web site to
see if you can find anything of a general spectral analysis nature.
Can you be a bit more specific just what you're looking for? Have you
been able to see anything on it yet? If you have a plugin that covers
any broadcast signals (AM, FM, TV) or communications signals, try just
hooking an antenna to the input, and adjusting the sensitivity till
you can see signals, and then "zoom in" on some fairly strong signal.
You'll likely learn a lot just by playing. I think it's safe to say
that so long as you don't put too much signal power into the input,
you won't hurt it by turning knobs.