I want to know what good for is that Bandwidth in a DSO

[_q12x_]

- I want to know what good for is that Bandwidth in a DSO !
With examples! What is BEST used for? Why is so important?
I mean... I know I heard some guys, on youtube videos and even here on the forum, who have old types osciloscopes, before these DSO models appeared, in 2000 I guess or so, they told me theirs worked at very low bandwidth. Like 10 or 5MHz.
Also I was reading a post of a romanian compatriot that bought the lowest bandwidth DSO from the list, for a bit more cheaper price than on the original website. That DS1054Z at 419 USD, he got it at 401 USD from here in romania as a 'cheap' offer. (Is still not cheap for me)
The actual page: 1000Z Mixed Signal Oscilloscopes RIGOL

 

[Julie.]

Well, I already have a DSO138 for experimenting so far. I have it for 3 years or so.
View attachment 102652

What I dont like on it: It has a very unclean waveform, full of jag and stairs and noise. Not at all clean.

...

That's a result of the sample rate.

Misunderstood effects of this do lead to missing key information.

I have a similar oscilloscope to the ones you are looking at, actually a siglent sds1000, it is usable - but you do have to be aware of limitations, when looking for a signal, don't just leave it on the same timebase, apply the signal then sweep through. You get one picture on one timebase and a totally different one on another!

 

[pc1966]

At times i have made simple RC or op-amp filters just so I can keep the scope display to the low frequency signal as I knew there was a lot of HF that would just upset things.

With the older analogue scopes you got a more complete/less strange display under those conditions.

 

[pc1966]

I have a Keysight EDUX1002A which is OK, though now obsolete/replaced by something in darker plastic. Not so expensive I worry about using it.

I also have a Rhode & Schwartz RTB2004 which is far more capable, but also going to be painful if I trash it.

 

[_q12x_]

Does exist in this big world second hand oscilloscopes at lower prices than the new ones?
I never find them, maybe you can direct me to some websites that you may know. Doesnt matter what country they are. Just to be cheaper than the new ones.

 

[pc1966]

I don't know, you could try the usual market places, etc.

Sometimes universities will have old stuff they get rid of when a budget allows replacement but often they are really old and sometimes they just get put in cupboards "just in case". But it might be worth asking.

 

[Lucien Nunes]

Does exist in this big world second hand oscilloscopes at lower prices than the new ones?

I asked this question when I was young and looking for my first proper scope. I was warned by one of my mentors, not to get lost down the rabbit-hole of historical test equipment. The situation occurs that you spend more time fixing the test equipment than the device you wanted to test, and to fix the test equipment you need higher-spec test equipment, which you really can't afford so you have to make do with even older versions, which you spend even more time fixing...

With digital it's less likely to be a problem than with the early high-end analogue scopes with 100+ tubes and 1kW power consumption. But it's a good rule to bear in mind.

 

[AminAmin]

Hi

That's a result of the sample rate.

Misunderstood effects of this do lead to missing key information.

I have a similar oscilloscope to the ones you are looking at, actually a siglent sds1000, it is usable - but you do have to be aware of limitations, when looking for a signal, don't just leave it on the same timebase, apply the signal then sweep through. You get one picture on one timebase and a totally different one on another!

FNIRSI 1C15 is better or 5012h?

 

[Julie.]

Hi

FNIRSI 1C15 is better or 5012h?

No idea, they are both very cheap handheld 'scopes.

Given their availability from many different suppliers, you may not get an original anyway, and therefore the item you buy probably doesn't go close to matching the specifications.

Best to look out for reviews