[time-nuts] Chinese Scopes

Azelio Boriani azelio.boriani at screen.it
Tue Apr 17 10:37:31 UTC 2012


Good, the HP54720. We have one but, unfortunately, lost the calibration
(backup battery dead). Now it need the HP51717 to complete the calibration.
So be warned not to let the backup battery go flat: replace it trying to
supply, with a diode, the NVRAM.

On Tue, Apr 17, 2012 at 7:01 AM, <SAIDJACK at aol.com> wrote:

> Hi guys,
>
> I am very partial to the HP Denali 54720D scope which is available on Ebay
> in varius forms for around $1500.
>
> This $50K+ when-new scope is very easy to use, has many low cost plug ins,
> 8GS/s with up to 2GHz Bandwidth plug ins available, and the amazing 54701A
> FET  probe. Support and spare parts supply are excellent. It's almost
> instantly  on and ready, something I really don't like about the small
> portable
> scopes as  they seem to take forever to boot up.
>
> The plug in I find most useful is the 54721A, with 1.1GHz bandwith, that
> gives two channels plus triggers.
>
> Don't look at the 54720A version, it is about the same price but has less
> performance (BW, memory etc).
>
> It's a bit more than a Rigol, but for around $2200 you can get the
> mainframe, two 21A plug ins, three FET probes, and as  a side-feature the
> use as a
> boat anchor..
>
> The only time I needed to use the manual was when using more obscure
> features such as histogram and FFT features, and then only to get all the
> details of what's possible. Otherwise it's so much easier to use than the
> small
> handheld Tektronix and Lecroy Waveace scopes.
>
> One cool feature is to use the 54701A probe as a FET input probe  for our
> RF spectrum analyzer, using the scope as a probe power supply.  Works
> amazingly well, I've used it up to way past 2GHz.Gives the analyzer
>  0.6pF/100KOhms
> input impedance. The probe is almost indestrucable.
>
> bye,
> Said
>
>
> In a message dated 4/16/2012 19:54:42 Pacific Daylight Time,
> hmurray at megapathdsl.net writes:
>
>
> >  To bring this full circle, a friend bought a very clean, working 465 for
>  $50
> > at MIT.
>
> Did that include probes?  :)
>
> Good  probes are probably worth more than that even without the scope.
>
>
> --
> These are my opinions, not necessarily my employer's.  I hate  spam.
>
>
>
>
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