[time-nuts] HP 5370B
didier at cox.net
Sat May 10 11:09:28 EDT 2008
Of course, actually that was the point of my posting.
Most people assume that what they read on the instrument's display is the
truth. As long as they read on the proper side of the requirement, (less
than a max, or more than a min) all is good.
I have been in this business for 30 years. They all do it, Raytheon,
Lockheed-Martin, Boeing, Northrop-Grumman, just to cite the better known.
The truth is usually a little more complicated than that.
> -----Original Message-----
> From: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Mike S
> Sent: Saturday, May 10, 2008 9:19 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] HP 5370B
> At 09:22 AM 5/10/2008, Didier Juges wrote...
> >Most microwave network analyzers have amplitude resolution
> of 0.01dB,
> >while their accuracy is just around 1dB in most cases.
> >I have had to argue too many times that a piece of equipment
> with a 2dB
> >p-p requirement on flatness was just fine when it measured 2.01dB on
> >the HP network analyzer. I would not have gotten in that argument if
> >the data had been 1.99dB. Go figure.
> I figure you're both wrong. If the measuring instrument is no
> better than 1 dB absolute, you can't expect to do it - a flat
> line measurement could represent an actual + or - 1 db, the
> limit of the spec.
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