Re: Calibrating a network analyser...
- From: lugnut808@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx (Chris Jones)
- Date: 01 Dec 2005 00:47:27 GMT
Paul Burridge wrote:
> Hi everyone,
>
> Well I bought this VNA (picture posted to abse under "network
> analyser") and I guess it needs calibrating since the last sticker
was
> dated 1998! It covers 4Mhz - 1.3Ghz, BTW.
> So I suppose I could get some chap in from HP on 3x10^726726
pounds/hr
> _or_ do it myself. It's not as if I need anything super-accurate,
> after all. I'm only a hobbyist and will only be goofing around with
> it.
> So I thought maybe I don't even need to borrow some other piece of
> expensive junk with a calibration certificate to check it off
> against...
> How about this idea? I cut say four lengths of 50 ohm feeder to
> exactly quarter wavelengths (factoring in appropriate velocity
> correction to the cable lengths concerned) at say 25Mhz, 200Mhz,
> 600Mhz and 1200Mhz. Then I hook these up in turn, whip the lid off
and
> twiddle the calibration pots to show the 'right' trace positions for
> each corresponding frequency. Then I short the ends out and
re-twiddle
> for a right-angle phase shift. Would this work? I can't think of a
> more absolute frequency standard than a simple specific length of
> feeder. But OTOH, I have been known to talk a bunch of crap and
maybe
> there's a big snag in this seemingly ingenious work-around that
hasn't
> occurred to me. What thinketh the Panel on this idea?
> Thanks,
> p.
>
You do not want to adjust any pots if it is a computer-controlled type
network analyser.
I think you might like to read the many application notes that you
will find
on this subject on the Agilent website. Even if they are not written
about
your specific model of analyser, they will give you some useful ideas.
Chris
.
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