Since a spectrum analyzer front end is usually wide open for the entire
bandwidth, a signal out of the range you are looking at could be
overloading the analyzer causing incorrect readings for the signals yor
are looking at. Having a tuned front end is one of the advantages of an
EMC receiver.
Doug
University of Oxford
Department for Continuing Education
Oxford, Oxfordshire, United Kingdom
--------------------------------------------------
Doug Smith
P.O. Box 60941
Boulder City, NV 89006-0941
TEL/FAX: 702-570-6108/570-6013
Mobile: 408-858-4528
Email: [email protected]
Web: http://www.dsmith.org
--------------------------------------------------
On Fri, 8 Jan 2016 16:08:23 +0000, Elliott Martinson
<[email protected]> wrote:
http://www.ieee.li/pdf/essay/receiver_v_sa.pdf
I just noticed you linked to a spectrum analyzer, yet I was talking
as if we were discussing EMI receivers. There are several key
differences even though I would have thought they were practically
the same thing had I not done some research. I noticed the maximum
sweep time on that spectrum analyzer is 1000s, or 16m40s. So that
point about it taking hours may seem wrong (at first). But, for good
measurements on a spectrum analyzer, you have to do only a small
portion of the total bandwidth at once, because with, say, 30MHz to
1GHz frequency range, the measurements would be a whopping 2MHz
apart! This is bad, because often, problem peaks may be very narrow
digital ones, which could easily be missed without testing only a
small portion of the spectrum at once. When that's taken into
consideration, it may well take hours, but also require more human
intervention during measurement. Before getting a spectrum analyzer,
it might be useful to check out the link at the top (unless y!
ou're already fully aware of the differences). I guess it really
depends on what you're trying to do.
Elliott Martinson
EMC Test Technician
Electronic Theatre Controls
3031 N PLEASANT VIEW RD
MIDDLETON WI 53562-4809
[email protected]
-----Original Message-----
From: Elliott Martinson [mailto:[email protected]]
Sent: Friday, January 08, 2016 9:52 AM
To: [email protected]
Subject: Re: [PSES] pre-compliance spectrum analyzer
At my workplace, we've got one of these:
https://www.rohde-schwarz.com/product/esrp-productstartpage_63493-35077.html
and it's pretty nice. Especially its huge dictionary of GPIB
remote-control commands, which makes interfacing with LabVIEW
convenient.
R&S makes good products. However, I have never used nor seen the one
you linked to.
I noticed no mention anywhere of FFT/time-domain scanning on the page
or the brochure (it'd be mentioned if it was a feature). That is a
HUGE weak point IMO, if measurement time is at all important. There
is no CISPR-Average scanning either, though RMS is probably similar
enough. Are you trying to find something that's relatively
inexpensive? Because it may be worth considering the expenses from
the time costs as well. Time-domain scanning can make something
that'd take several hours take only a few minutes, or possibly
seconds (depending on context). If you stick to peak scans, it may
not be so bad. It'll look noisier than quasi-peak, but that's okay
since it's better to err on the side of less noise.
-Elliott
-----Original Message-----
From: Amund Westin [mailto:[email protected]]
Sent: Friday, January 08, 2016 2:05 AM
To: [email protected]
Subject: [PSES] pre-compliance spectrum analyzer
Sorry for incorrect subject ... I'll try again:
-------------------
Looking for a pre-compliance spectrum analyzer for in-house checking.
Found this one from R&S.
http://value.rohde-schwarz.com/vi/value/spectrum-analyzers/hms-spectrum-analyzer.html
Anyone who have used this one?
Regards
Amund
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