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Modern digital oscilloscopes question

Started by eatmorepies December 12, 2011
Hello

I worked in a place that gave me access to budget, non memory 20MHz CRT
scopes - I no longer work there. They were perfect for my needs.

Six years on and I find I need an oscilloscope, the market seems to have
changed. Are those cheap digital models any good?

I need reasonable Y sensitivity (5mV/div), up to 5MHz, storage would be
nice, it's not for radio work.

I found things like this...

http://www.rapidonline.com/Tools-Equipment/Uni-T-UTD2000-series-2-Channel-digital-storage-oscilloscopes-400399/?sid=2e6f6286-b98a-4994-b9ce-0631e8fc6b4d

Decent for the money? Or to be avoided?

John



On 12/12/2011 1:32 PM, eatmorepies wrote:
> Hello > > I worked in a place that gave me access to budget, non memory 20MHz CRT > scopes - I no longer work there. They were perfect for my needs. > > Six years on and I find I need an oscilloscope, the market seems to have > changed. Are those cheap digital models any good? > > I need reasonable Y sensitivity (5mV/div), up to 5MHz, storage would be > nice, it's not for radio work. > > I found things like this... > > http://www.rapidonline.com/Tools-Equipment/Uni-T-UTD2000-series-2-Channel-digital-storage-oscilloscopes-400399/?sid=2e6f6286-b98a-4994-b9ce-0631e8fc6b4d > > Decent for the money? Or to be avoided? > > John > > >
Half again the price of a comparable Rigol, ISTM. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
"eatmorepies"
> > I worked in a place that gave me access to budget, non memory 20MHz CRT > scopes - I no longer work there. They were perfect for my needs. > > Six years on and I find I need an oscilloscope, the market seems to have > changed. Are those cheap digital models any good?
** Not so good for service work, particularly audio service. If you like using analogue scopes, stick with one. Analogue scopes are easy to use and tell you no lies. The opposite is true for digital ones. ... Phil
On 13/12/2011 4:32 AM, eatmorepies wrote:
> Hello > > I worked in a place that gave me access to budget, non memory 20MHz CRT > scopes - I no longer work there. They were perfect for my needs. > > Six years on and I find I need an oscilloscope, the market seems to have > changed. Are those cheap digital models any good? > > I need reasonable Y sensitivity (5mV/div), up to 5MHz, storage would be > nice, it's not for radio work. > > I found things like this... > > http://www.rapidonline.com/Tools-Equipment/Uni-T-UTD2000-series-2-Channel-digital-storage-oscilloscopes-400399/?sid=2e6f6286-b98a-4994-b9ce-0631e8fc6b4d > > Decent for the money? Or to be avoided? > > John > > >
UNI-T is nice for a Chinese brand. You are aware that the basic 25Mhz model is only good to about 5Mhz for digital (a 5Mhz square wave being made up of a 5Mhz fundamental plus odd order harmonics. 25Mhz only allows the first two harmonics, giving you a wonky square wave but it is OK for basic stuff if you know what your looking for) Lots of people like this scope: http://www.saelig.com/product/PSPC017.htm Have a look at these. They seem to meet your spec and give a bit more. http://www.dealexcel.com/ut2062ce-digital-storage-oscilloscope-60mhz-color-screen_p332.html http://www.dealexcel.com/ads1042c-digital-storage-oscilloscope-40mhz-500mss-usb_p650.html http://www.dealexcel.com/mini-digital-storage-color-oscilloscope-handheld-scope-ds-203-nano-black_p19554.html -- We have failed to address the fundamental truth that endless growth is impossible in a finite world.
On Mon, 12 Dec 2011 18:32:21 -0000, "eatmorepies"
<jckipper@lineone.net> wrote:

>Hello > >I worked in a place that gave me access to budget, non memory 20MHz CRT >scopes - I no longer work there. They were perfect for my needs. > >Six years on and I find I need an oscilloscope, the market seems to have >changed. Are those cheap digital models any good? > >I need reasonable Y sensitivity (5mV/div), up to 5MHz, storage would be >nice, it's not for radio work. > >I found things like this... > >http://www.rapidonline.com/Tools-Equipment/Uni-T-UTD2000-series-2-Channel-digital-storage-oscilloscopes-400399/?sid=2e6f6286-b98a-4994-b9ce-0631e8fc6b4d > >Decent for the money? Or to be avoided? > >John > >
My regular scope is a Rigol DS1052E. It's great. The going price is around $340. I'd never go back to an analog scope or a VTVM. John
On 12/12/2011 5:41 PM, John Larkin wrote:
> On Mon, 12 Dec 2011 18:32:21 -0000, "eatmorepies" > <jckipper@lineone.net> wrote: > >> Hello >> >> I worked in a place that gave me access to budget, non memory 20MHz CRT >> scopes - I no longer work there. They were perfect for my needs. >> >> Six years on and I find I need an oscilloscope, the market seems to have >> changed. Are those cheap digital models any good? >> >> I need reasonable Y sensitivity (5mV/div), up to 5MHz, storage would be >> nice, it's not for radio work. >> >> I found things like this... >> >> http://www.rapidonline.com/Tools-Equipment/Uni-T-UTD2000-series-2-Channel-digital-storage-oscilloscopes-400399/?sid=2e6f6286-b98a-4994-b9ce-0631e8fc6b4d >> >> Decent for the money? Or to be avoided? >> >> John >> >> > > > My regular scope is a Rigol DS1052E. It's great. The going price is > around $340. > > I'd never go back to an analog scope or a VTVM. > > John >
Hey, wait a minute. I've bought two Simpson VTVMs in the last year. (Mostly for the nice analogue displays, admittedly. Analogue is nice for temperature-control loops and other things that change on the time scale of 100 ms to 10 s or thereabouts.) Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
On Dec 12, 5:41=A0pm, John Larkin
<jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
> On Mon, 12 Dec 2011 18:32:21 -0000, "eatmorepies" > > > > > > <jckip...@lineone.net> wrote: > >Hello > > >I worked in a place that gave me access to budget, non memory 20MHz CRT > >scopes - I no longer work there. They were perfect for my needs. > > >Six years on and I find I need an oscilloscope, the market seems to have > >changed. Are those cheap digital models any good? > > >I need reasonable Y sensitivity (5mV/div), up to 5MHz, storage would be > >nice, it's not for radio work. > > >I found things like this... > > >http://www.rapidonline.com/Tools-Equipment/Uni-T-UTD2000-series-2-Cha... > > >Decent for the money? Or to be avoided? > > >John > > My regular scope is a Rigol DS1052E. It's great. The going price is > around $340. > > I'd never go back to an analog scope or a VTVM. > > John- Hide quoted text - > > - Show quoted text -
I like my Rigol, but to be honest I use the cheap TEK (1001B?) more often. I've got an old analog TEK that I'd like to bring back to life! Not great speed, but it's got a 1mV/div input range that I used. DSO's mostly suck at low sensitivity.... JL build's his own input stages, I assume. George H.
On Dec 12, 4:14=A0pm, "Phil Allison" <phi...@tpg.com.au> wrote:
> "eatmorepies" > > > > > I worked in a place that gave me access to budget, non memory 20MHz CRT > > scopes - I no longer work there. They were perfect for my needs. > > > Six years on and I find I need an oscilloscope, the market seems to hav=
e
> > changed. Are those cheap digital models any good? > > =A0** Not so good for service work, particularly audio service. > > =A0 =A0 =A0If you like using analogue scopes, stick with one. > > =A0 =A0 =A0Analogue scopes are easy to use and tell you no lies. > > =A0 =A0 =A0The opposite is true for digital ones. > > ... =A0Phil
Yeah but an analog 'scope can't average. Put that together with the digital filters on the front end of the Rigol and it's a pretty nice tool for finding signals. George H.
"George Herold"

Yeah but an analog 'scope can't average.

** So fucking what ?

Put that together with the digital filters on the front end of the
Rigol

** Shame there are no analogue ones.

Shame how the scope keeps showing things that are not at the input - like 
aliasing products, noise and signals that have stopped seconds ago.

These are fatal flaws in audio servicing.


...  Phil 


On Dec 12, 10:42=A0pm, "Phil Allison" <phi...@tpg.com.au> wrote:
> "George Herold" > > Yeah but an analog 'scope can't average. > > ** So fucking what ?
I'll post some 'scope shots tomorrow. Averaging is very useful, for all sorts of things. Average 256 signals and if you trigger it right your noise goes down by a factor of 16! You can see all sorts of 'little crap' that way.
> > Put that together with the digital filters on the front end of the > Rigol > > ** Shame there are no analogue ones. >
Oh I agree, But the cost would be out of control. I haven't looked closely at the Rigol's digital filters, there may be some flaws. You just need to know the limits of your tools.
> Shame how the scope keeps showing things that are not at the input - like > aliasing products, noise and signals that have stopped seconds ago. > > These are fatal flaws in audio servicing.
Oh DSO's aren't for every task. For what I do it's useful. George H.
> > ... =A0Phil