[time-nuts] Chinese Scopes

[J. Forster]

That's another reason you want to use a Tek 600 series (or other) display
for X-Y work. The axes are identical and the Z axis has high BW.

-John

===========


> One issue with X-Y mode on analog scopes is the different bandwidth of the
> two signal paths. Do not expect to have amplitude or phase fidelity within
> the vertical bandwidth. 1/10th of it is probably the best you can hope
> for.
>
> In that regard, DSOs with all their quirks are more symmetrical since
> those I have seen do this actually use the two vertical channels, so the
> bandwidth is matched.
>
> Didier KO4BB
>
> Sent from my BlackBerry Wireless thingy while I do other things...
>
> -----Original Message-----
> From: "Marvin E. Gozum" <marvin.gozum at jefferson.edu>
> Sender: time-nuts-bounces at febo.com
> Date: Wed, 18 Apr 2012 07:29:00
> To: <time-nuts at febo.com>; <time-nuts at febo.com>
> Reply-To: Discussion of precise time and frequency measurement
> 	<time-nuts at febo.com>
> Subject: [time-nuts] Chinese Scopes
>
> XY quality:
>
> Many DSO have had slow wfms/sec or update rates.
> Its a reason Agilent touts its new fast rates in their new scopes.
> Here's a test XY mode "youscope" test app on an analog, Agilent
> Infiniivison and Rigol 1052e for comparison:
>
> http://www.youtube.com/watch?v=OxlCoKN4W7c
>
>
> Mpts on timebase:
> More memory is always good but it may not be so on low end scopes as
> it eats refresh rates.
>
> used Tek scope:
> Old scopes are always a gamble, some odds are worse than others.  If
> you can risk worse case and have to repair it, and can do so, have
> the space for it, it likely will do better than any low end Chinese scope.
>
> In the end, I think the Chinese label scopes raise the bar on new
> entry level DSO, opposed to the existing leaders.  But one can't
> expect too much from them.  Only Rigol provides 1 GHz bandwidth to
> date, just at the low end of the top tier models by Agilent, LeCroy and
> Tek.
>
> Will they catch up soon?  Dunno, I presume manufacturers have wised
> up on IP theft, and won't be giving it away as in past 20 years, to
> Chinese industry.
>
>
> http://readingjimwilliams.blogspot.com/
>
>
>
>>At 01:51 PM 4/16/2012, time-nuts-request at febo.com wrote:
>>
>> >There is a rumor that one also needs an analog scope.
>>
>>Where analog scopes generally win is in X-Y mode, most digitals I've
>>seen suck at that.
>>
>>
>>At 06:44 PM 4/16/2012, time-nuts-request at febo.com wrote:
>>>
>>>OK. IMO, there is another, perhas a more important, issue....  memory
>>> depth.
>>
> To bring this full circle, a friend bought a very clean, working 465 for
> $50 at MIT.
>
>
>
>
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