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-requ...@febo.com wrote:
Message: 7
Date: Mon, 16 Apr 2012 09:46:27 +0200
From: Attila Kinali<att...@kinali.ch>
To: li...@lazygranch.com, Discussion of precise time and frequency
measurement<time-nuts@febo.com>
Subject: [time-nuts] Chinese Scopes (was: Re: LORAN-C at MIT)
Message-ID:<20120416094627.f245ebdfd5df7305dd528...@kinali.ch>
Content-Type: text/plain; charset=US-ASCII
On Sun, 15 Apr 2012 22:42:31 +0000
li...@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
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
