[time-nuts] Chinese Scopes

[Peter Gottlieb]

Heard a story of someone who went to a high performance driving school 
for racers.  One of the specialty cars had an encounter with a wall and 
was out of service so the instructor grabbed an ordinary street rental 
car from the lot.  Everyone laughed until the instructor out-drove them all.

If you know what you are looking for and understand the instruments you 
can indeed do what you need to with a 500 MHz analog scope.

Peter


On 4/16/2012 1:59 PM, J. Forster wrote:
>> At eevblog.com forum Chinese scopes are a daily discussion for over 3
>> years.
>>
>> In summary, in the<= 100 MHz level they are very cost effective but there
>> are better and worse.  Rigol, Owon and Hantek are on par while Atten and
>> Uni-T are consistently rated less.  The criteria for rating them are
>> measurement accuracy and precision, UI, construction quality and tech
>> support.
> Measurement accuracy is a ruse, IMO. I don't care if a 'scope is
> "accurate". I want the waveform to be a faithful representation of the
> electrical behaviour of the circuit, free oif sampling artifacts and
> aliasing.
>
> If I want to accurately measure a voltage, I'll use a differential
> comparator or DVM. Anything timing, an appropriately gated counter.
>
> Some years ago Tektronix had a digital camera package with RS-170 output
> and some aardvaark frame grab board for a PC and a SW package. It was
> designed to do waveform measurement.
>
> I would actually like to know why many seem to feel that a 500 MHz analog
> 'scope is not "good enough" for what you really do in your lab?
>
> The more I hear about 40 GSps or whatever 'scopes, the more I'm convinced
> it's like comparing car engines or top speed. So, I have a car that'll do
> 160 MPH and yours will do 172? So what? Can you use it? No.
>
> YMMV,
>
> -John
>
> ================
>
>> Prices vary depending on country, and local support varies.  Those
>> differences will help you choose between the better 3 brands.
>>
>> Rigol is consistent in quality all around, but cost more than the others.
>> Rigol is the only maker with scopes that compete with Agilent or Tek, in
>> the 1-4 GHz level.  Support is mostly via the sellers.  In the USA, Rigol
>> has a subsidiary that provides responsive support.
>>
>> Owon and Hantek offer larger screens, more features and better GUI, but
>> can be plagued with construction flaws.  Its acceptable if your seller
>> will exchange any defective units you purhcase.  Owon has provided tech
>> and hardware support directly from China, including spares.
>>
>> Atten and Uni-T glitches are concerning, as they tend to provide erratic
>> measurement.
>>
>>
>> At 04:19 04/16/2012, time-nuts-request at febo.com wrote:
>> Message: 7
>> Date: Mon, 16 Apr 2012 09:46:27 +0200
>> From: Attila Kinali<attila at kinali.ch>
>> To: lists at lazygranch.com, Discussion of precise time and frequency
>> measurement<time-nuts at febo.com>
>> Subject: [time-nuts] Chinese Scopes (was: Re: LORAN-C at MIT)
>> Message-ID:<20120416094627.f245ebdfd5df7305dd528952 at kinali.ch>
>> Content-Type: text/plain; charset=US-ASCII
>>
>> On Sun, 15 Apr 2012 22:42:31 +0000
>> lists at lazygranch.com wrote:
>>
>>> Sadly, the last scope I bought was a Chinese Rigol. (I do have "real"
>>> scopes too.) It is getting to the point where Rigol and Instek will make
>>> buying boat anchors a thing of the past.
>> What's the quality of those chinese scopes?
>> I could need a "modern" DSO as addition to my stone age 2ch 50MHz Tek.
>> But there isn't any usable surplus market in europe and used scopes cost
>> nearly as much as new ones. Ie Tek, Agilent and LeCroy are out of my
>> budget,
>> even if used. But then, i'd rather spend 2000chf on a new Scope than get
>> one for 500 that isn't half usable.
>>
>> Attila Kinali
>>
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