guide for buy digital scope

[mohandes]

Hi all guru
I think all of you have scope(dig or analog) and you can work very easy and every time you can measurement and ...

This time i want to by digtal scope but befor that i need consultation & talk to Gurus and each one have data about the scopes ,for buy the best
ok ,I think 20M or 40M good for all detectors and low ferequency work , PLEASE look at here http://www.rayannik.com/sn/products/catId/44/lang/fa and say me ?

if I fumble about the range of scope tell me the best for work (and cheapest )
thanks

[Tepco]

Decision about buying oscilloscope for hobby purposes is quite simple and depend primarily on amount of money you are willing to spend. Cheapest way is old analog (CRT) HP or Tek scope on Ebay, bit risky 100-150$ affair but probably not available in your country. Another is new generation Chinese basic DSO model, 350-400$ range, Rigol 1052,1152 or Owon 7102 is good starting point, there are cheaper models, but difference in price is very small. You have nice offer on that website, just keep in mind, this is all OEM production, forget everything about company or manufacturer name and model, you can get your own name on them if you order 500 or so, probably everything is made in same Chinese factory. Very useful instruments for the money, just check prices, for example in country where I live similar models are available, or can be ordered in just about any electronic shop but prices are about TWICE! higher compared to web offer. Most important part in making decision is from where to buy, not actually what model, this may depend locally, some basic 50-100MHz model is good, I can recommend Owon 7102.

[Davor]

Most probably you'll find a good old analogue 2-channel 20MHz oscilloscope in your country for even less than $150. Even a 30 year old scope in working condition will serve you very well.

[mohandes]

Decision about buying oscilloscope for hobby purposes is quite simple and depend primarily on amount of money you are willing to spend. Cheapest way is old analog (CRT) HP or Tek scope on Ebay, bit risky 100-150$ affair but probably not available in your country. Another is new generation Chinese basic DSO model, 350-400$ range, Rigol 1052,1152 or Owon 7102 is good starting point, there are cheaper models, but difference in price is very small. You have nice offer on that website, just keep in mind, this is all OEM production, forget everything about company or manufacturer name and model, you can get your own name on them if you order 500 or so, probably everything is made in same Chinese factory. Very useful instruments for the money, just check prices, for example in country where I live similar models are available, or can be ordered in just about any electronic shop but prices are about TWICE! higher compared to web offer. Most important part in making decision is from where to buy, not actually what model, this may depend locally, some basic 50-100MHz model is good, I can recommend Owon 7102.

Most probably you'll find a good old analogue 2-channel 20MHz oscilloscope in your country for even less than $150. Even a 30 year old scope in working condition will serve you very well.

Hi my friendTepco&Davor
how i can contradistinction where is made(made in which country)?
I think dig scope better than analog??!!!and i want buy one of the this marks:1-pintek 2-Gw 3-tek
now i decision by 60MH ,but tell me which markes(i knoe tepco you say the prie is imprtant but brand is important too, you think all of price for the above brand are 400$.
thanks

[Davor]

I think dig scope better than analog??!!!

Wrong. Only very good digital scopes work as good as analogue.

[mohandes]

Wrong. Only very good digital scopes work as good as analogue.

why?
but the analog have not set points like store & auto measurement &...
if more explain me i believe the analoge and by 20M and work it.thanks my friend

[mohandes]

http://www.rayannik.com/files/static...815243300T.pdf

please chek above list.just know 2500toman(Monetary unit Iran)=1$
many thanks

[Davor]

Sorry, that pdf is beyond me.

As for analogue vs. digital, I'm talking about bang per buck. E.g. how much money you have to invest per unit of happiness. Point is that for vast majority of your purposes a good analogue scope will do perfect, say 99% of the time. To get an instrument of same capability in digital world that will do more than 99% jobs, you'll have to ca$h at least twice as much money. Also when you will think about your investment in 10 years, you'll have either the same analogue scope that still works very fine, or several failed digital junk beyond repair, and impossible to plug into any computer because all the plugs they have are long ago obsolete.

[Tepco]

http://www.rayannik.com/files/static...815243300T.pdf

please chek above list.just know 2500toman(Monetary unit Iran)=1$
many thanks

Sorry, this is impossible to translate. Avoid Hameg, Protec or Tektronics, usually more expensive. From website, GDS-1052U looks like some incarnation of Rigol 1052, and GDS-1072A-U is like Owon 7102, should be cheap and good enough. What is the price in $? Again, forget manufacturer name or brand or model, everything is “made in China”( No.156,Cai He Village,Sha He Town,Chang Ping District, Beijing,102206 P.R.China ). Do some web search to find out more details. These machines are more than good for that money.

[Tepco]

One more potentially useful info about all this, how to judge performance level. First, avoid any older generation DSO, they are now obsolete. Things are evolved in meantime, old HP with 10MSPS and few Kb of acquisition memory, or newer Tek, with faster sampling but still shallow memory simply cannot compete with Chinese “toy” having 1GS sampling and megabyte memory. This is important, not just bandwidth, how many MHz it goes. Having analog scope is nice too, only most of us does this just for “sentimental” reasons, not exactly for any practical use.

[Qiaozhi]

Sorry, this is impossible to translate. Avoid Hameg, Protec or Tektronics, usually more expensive. From website, GDS-1052U looks like some incarnation of Rigol 1052, and GDS-1072A-U is like Owon 7102, should be cheap and good enough. What is the price in $? Again, forget manufacturer name or brand or model, everything is “made in China”( No.156,Cai He Village,Sha He Town,Chang Ping District, Beijing,102206 P.R.China ). Do some web search to find out more details. These machines are more than good for that money.

I have a GDS-1022, which is more than adequate for metal detector design. As Tepco says, they're probably all made in the same Chinese factory and then re-badged with the manufacturer's name. Although I also have a couple of analog scopes, they're basically sat in the corner collecting dust.

[mohandes]

HI my best friends: davor,Tepco,Qiaozhi
first : tell me about the sampling & bandwidth about the oscope,20MH and analog good for metall detector or no?
second:GDS-1052U looks like some incarnation of Rigol 1052, and GDS-1072A-U is like Owon 7102 ,
GDS 1072A U is very expensive so remain GDS 1052U and not verycheep ,it is middle for me.if analog oscope can do as dig oscope ,I buy the analog ,but if you think dig best i will pay for dig.
GDS 1052U have different price to MOS620H(analog oscope) ,450000TOMAN that equal 180$.
tell me finall guide please.

Rigol 1052 and Owon 7102 ,they dont exist in my country.this site is one of the bigest shop,analog : http://www.rayannik.com/sn/products/catId/43/lang/fa ,for dig scope : http://www.rayannik.com/sn/products/catId/44/lang/fa , for analog and dig : http://www.rayannik.com/sn/products/catId/45/lang/fa , for hande oscope : http://www.rayannik.com/sn/products/catId/54/lang/fa
many thanks

[Qiaozhi]

HI my best friends: davor,Tepco,Qiaozhi
first : tell me about the sampling & bandwidth about the oscope,20MH and analog good for metall detector or no?

The GDS-1022 has a bandwidth of 25MHz and a sampling rate of 250Sa/s.
There are many things you can do with a digital storage scope that you cannot do with an analog scope. For example, built-in measurement functions, screen capture, saving & recalling waveforms, etc. For a long time I used a 20MHz Gould OS300, which is an analog scope. If that's all you can afford or find locally, then it's a lot better than no scope at all.
Also, I would strongly advise getting a 2-channel scope, as it is frequently necessary to see the phase relationship between two waveforms.

[Davor]

This is my thought exactly. For any kind of production you need a serious machine, but when on budget the absolute minimum that will get you there is an analogue 20MHz two channel scope that right now come cheap as chips, and will continue working well for the next maybe 20 years. No digital scope in 100USD range will come anywhere near it in performance.

[mohandes]

This is my thought exactly. For any kind of production you need a serious machine, but when on budget the absolute minimum that will get you there is an analogue 20MHz two channel scope that right now come cheap as chips, and will continue working well for the next maybe 20 years. No digital scope in 100USD range will come anywhere near it in performance.

HI gurus
i want buy it http://www.istgah.com/search/?stext=...siteid=1119603
this made in japan and the name is iwatsu 5705.
it is second-hand and i should test it and after buy it.now my ? is ,is it well however it is second-hand?
HOW CAN i test the oscope?by signal generator? do not exist simple way?
thanks