Emona Rigol Digital Scopes

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

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 :)

Thanks for your input guys.

Joe

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

Greg

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

messagenews: snipped-for-privacy@y80g2000hsf.googlegroups.com...

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.

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.

"David Lunatic Jones"

** 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

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

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.

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?

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

I never said it wasn't.

Get with the program Phil.

Dave.