Emona Rigol Digital Scopes

[Joe G \(Home\)]

HI All,

Does any one use the Rigol Digital Scopes sold by Emona.

What is their performance like.

http://www.emona.com.au/Bargains/Bargains0001.htm

Comments most welcome.


Joe

 

[Malcolm Smith]

I bought a tektronix digital scope >200Mhz (I recollect) two chanel colour
screen for about the price of the rigol - this was a couple of years ago so
have you checked the price of a new Tektronix?

I havnt heard of the rigel - are they selling cheap because they are no
longer to be sold in Aus or something like this which may mean support in
the future will dissapear? be careful but they might turn out to be a goob
buy.

Malcolm

 

[David L. Jones]

HI All,

Does any one use the Rigol Digital Scopes sold by Emona.

What is their performance like.

http://www.emona.com.au/Bargains/Bargains0001.htm

Comments most welcome.

Joe

I've used one and the Rigol is an excellent unit for the money, better
than the low end Tek IMHO.
The Agilent 3000 series is a re-badged Rigol, so you are effectively
buying an Agilent if you want to look at it that way. The Rigol would
therefore benefit from Agilent testing and other technical input etc.

There has been some discussion about Rigol's recently on
sci.electronics.design

"Performance" is the same as any other low end digital scope. i.e.
relatively limited sample memory, limited responsiveness, and limited
screen resolution compared to a "high end" digital scope like say an
Agilent 6000 series. But perfectly usable for most general apps. You
get what you pay for.

I would not hesitate in buying one with my own money if I was looking
to buy in that market.

Dave

 

[Joe G \(Home\)]

Thanks for your input guys.

Joe

 

[gcd]

Hi,
you might want to consider one of these on ebay. Basically the same price
for a 100MHz unit but 10gs/s effective.

<http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=330099673168>

Greg

 

[David L. Jones]

Hi,
you might want to consider one of these on ebay. Basically the same price
for a 100MHz unit but 10gs/s effective.

<http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=330099673168>

It is only 100MS/s, that gives it an effective single shot bandwidth
of only 10MHz.
"Effective" sampling scopes are ineffective dinosaurs, all but useless
for many general apps, you are better off sticking with an analog
scope.

It's cheap for many reasons, you get what you pay for.

Dave.

 

[gcd]

It is only 100MS/s, that gives it an effective single shot bandwidth
of only 10MHz.
"Effective" sampling scopes are ineffective dinosaurs, all but useless
for many general apps, you are better off sticking with an analog
scope.

It's cheap for many reasons, you get what you pay for.

Dave.

Hi,
the ebay one states its single shot bw is 20MHz. Eventually found the rigol
specs.http://www.rigolna.com/
Their data sheet indicates the sampling is a true 1gs/s for the MA or CA
suffix and 250MHz for the C and M suffix, all with effective 50gs/s. So
despite the fact they look the same, the rigol is different. I posted that
link believing the 1gs/s was effective not real, my mistake.

Not sure I want to get into the analogue vs digital discussion. But I will
say that even on analogues you need to read the fine print, ie bandwdith vs
vertical scale for example.

Greg

 

[David L. Jones]

Hi,
the ebay one states its single shot bw is 20MHz.

They can state 50MHz if they like and would not be incorrect.
At 100MS/s you will only get 5 samples of a 20MHz signal, not enough
to tell you if it's a triangle wave or sine wave.
The rule of thumb is 10 samples minimum.

Eventually found the rigol
specs.http://www.rigolna.com/
Their data sheet indicates the sampling is a true 1gs/s for the MA or CA
suffix and 250MHz for the C and M suffix, all with effective 50gs/s. So
despite the fact they look the same, the rigol is different. I posted that
link believing the 1gs/s was effective not real, my mistake.

Ever since the original Tek TDS-210 came out with 1GS/s, every low end
scope is now "real time" and does not use repetitive or "effective"
sampling techniques.
These cheap Chinese ones are a step back to non real-time sampling as
they have found a new price-point to sell a DSO at. I'd call it the
"sub low-end" category. But if you can only afford $300 instead of
$800 or whatever, then it's better than no digital scope at all.

I'm actually quite curious to see what you get for a your couple of
hundred bucks!

Dave.

 

[Phil Allison]

"David Lunatic Jones"

They can state 50MHz if they like and would not be incorrect.
At 100MS/s you will only get 5 samples of a 20MHz signal, not enough
to tell you if it's a triangle wave or sine wave.
The rule of thumb is 10 samples minimum.

** So David Fuckwit Jones has no clue what the definition of "bandwidth" is
!!!!

The insufferably SMUG & totally AUTISTIC ASS has no clue about any
bloody thing.

FYI - an analogue CRO will not reveal anything about a waveform at or near
its upper frequency limit - other than amplitude (with compensation for
the known roll off to be applied if that is critical). To see a half
reasonable 10 MHz square wave on the screen requires a **100MHz **
bandwidth CRO.


The digital scope in question is stated to have a 100MHz bandwidth = the
bandwidth of the **analogue** input stage !!!

It samples at up to 100MHz in single shot mode - so can reveal the
amplitude of a frequency below 50 MHz.

With a continuous signal, in oversampling mode, it operates at up to an
effective rate of 10 GS/s = 200 samples of a 50 MHz wave.

But the analogue bandwidth is still only 100MHz.

Detail in the viewed wave is still limited mostly by that.



........ Phil

 

[David L. Jones]

"David Lunatic Jones"



** So David Fuckwit Jones has no clue what the definition of "bandwidth" is
!!!!

I most certainly do Phil, check out any one of my dozens of other
posts on the subject over the years.

The insufferably SMUG & totally AUTISTIC ASS has no clue about any
bloody thing.

FYI - an analogue CRO will not reveal anything about a waveform at or near
its upper frequency limit - other than amplitude (with compensation for
the known roll off to be applied if that is critical). To see a half
reasonable 10 MHz square wave on the screen requires a **100MHz **
bandwidth CRO.

The digital scope in question is stated to have a 100MHz bandwidth = the
bandwidth of the **analogue** input stage !!!

Where did I say it wasn't?

"Single shot bandwidth" is a common term used in reference to Digital
scopes, it has nothing really to do with the analog bandwidth (unless
the analog bandwidth is the limiting factor) . The scope in question
can claim to have anything up to a 50MHz "single shot bandwidth" as I
said. Of course it would be useless at that, and is almost as useless
at the claimed 20MHz. That is why the industry rule of thumb is 1/10th
the sample rate, 10MHz in the case of the scope in question.

It samples at up to 100MHz in single shot mode - so can reveal the
amplitude of a frequency below 50 MHz.

Only if it samples in the right place Phil.
At 100MS/s you only get *2* samples per cycle displayed, and those
samples won't necessarily won't be at the peak values. Ever tried to
measure a 50MHz signal with a 100MS/s scope in single shot mode Phil?

With a continuous signal, in oversampling mode, it operates at up to an
effective rate of 10 GS/s = 200 samples of a 50 MHz wave.

Entirely different to single shot mode which was what I was talking
about.

But the analogue bandwidth is still only 100MHz.

I never said it wasn't.

Get with the program Phil.

Dave.

 

[Phil Allison]

"David Lying Fuckwit Jones"

I most certainly do Phil, check out any one of my dozens of other
posts on the subject over the years.

** Sure have - all of them FULL of the same BULLSHIT !

"Single shot bandwidth" is a common term used in reference to Digital
scopes, it has nothing really to do with the analog bandwidth (unless
the analog bandwidth is the limiting factor) . The scope in question
can claim to have anything up to a 50MHz "single shot bandwidth" as I
said. Of course it would be useless at that, and is almost as useless
at the claimed 20MHz.

** Total BOLLOCKS !!!!!!!!


That is why the industry rule of thumb is 1/10th

the sample rate,

** A rule of BUM !~!

Only if it samples in the right place Phil.
At 100MS/s you only get *2* samples per cycle displayed, and those
samples won't necessarily won't be at the peak values.

** But some of them will be and that is enough to reveal the amplitude.

You **** HEAD !!

Have a BIG dose of rat bait.





.......... Phil

 

[David L. Jones]

"David Lying Fuckwit Jones"



** Sure have - all of them FULL of the same BULLSHIT !



** Total BOLLOCKS !!!!!!!!

Why?
Do you seriously think you can get a decent waveform display with only
5 samples per cycle in single shot mode?

That is why the industry rule of thumb is 1/10th


** A rule of BUM !~!

It's obvious that you have little experience with digital scopes
Phil.

** But some of them will be and that is enough to reveal the amplitude.

Obviously you have little experience with using digital scopes and
single shot mode Phil.
But that is not the least bit surprising.

There is a reason why low sample rate high analog bandwidth HP and Tek
equivalent sampling scopes go for song on eBay.

You **** HEAD !!

Have a BIG dose of rat bait.

*yawn*

Dave.

 

[Phil Allison]

"David Lying Pig Jones"

** So David Fuckwit Jones has no clue what the definition of "bandwidth"
is !!!!

Why?
Do you seriously think you can get a decent waveform display with only
5 samples per cycle in single shot mode?

** Still got NOTHING to do with " bandwidth" - FUCKWIT !!

Have a GIANT dose of rat bait.

You pathetic FUCKING WEASEL !!




.......... Phil