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Topic: Oscilloscope or logic analyzer  (Read 2229 times) previous topic - next topic

simon1974

I was going to buy this --Handheld DSO203 ARM  Digital Oscilloscope 4 CH..
After reading some posts on this forum. I need some help. Some people have posted that a logic analyzer is more useful.
I'm  just a newby to hobby electronics and would be using it to explore low voltage circuits and expand my knowledge.
 
A quick ebay search has revealed lots of usb logic analyzers under £50  but I'm not sure about plugging something like this into my i7 laptop.

Can someone please show me  the light.
Thanks Simon

simon1974

#1
Jan 20, 2016, 12:20 am Last Edit: Jan 20, 2016, 12:27 am by simon1974
http://pages.ebay.com/link/?nav=item.view&id=300914430820&alt=web
 
This one!
http://pages.ebay.com/link/?nav=item.view&id=300914430820&alt=web

dally

usb logic analyzers under £50
a good LA is useful when you have to develop digital things, especially fpga
chipscope (as they are called in fpga world) cost thousand euro (in licenses)
while a good physical LA costs no less than 200 euro

everything else is money trashed

my suggestion is: buy a good DSO with 2 Ch, 100Mhz (say RIGOL is good)
and forget LA until you have to develop serious things

p.s.
if you just need to analyze serial wires (e.g. SPI, i2c, uart), you can buy a DSO that has "protocol" support
Rigol has these DSO, they cost no less than 500-600 euro

second hand (say 40..50% discount) can be a good alternative

simon1974


Boardburner2

I would agree with the oscilloscope choice.

Its possible to get e really useful used one for about 50 on ebay.

They tend to be older heavier ones so collection is really needed so that you can check operation and not pay big carriage.

I have a 50 Mhz techtronics which has served me well for 25 years.
I purchased one off ebay for 50 + post purely to replace the tube.  

Boardburner2

I was going to buy this --Handheld DSO203 ARM  Digital Oscilloscope 4 CH..

While cheap the spec says that it has a band width of 8 MHZ.

That's too low imho for digital work with arduino.

While a dro is more useful, getting something better second hand will give you experience in what to look for in a scope.

larryd

#6
Jan 20, 2016, 12:59 am Last Edit: Jan 20, 2016, 01:00 am by LarryD
IMO

Priority:
-Good voltmeter
-Logic probe (resistor and led will do)
-Oscilloscope DSO 2 channel, 4 if you can afford it. 100 minimum, better 250MHz Rigol
-Logic analyzer 150Mhz+ 8 or 16 channel. Saleae

.
No technical PMs.
The last thing you did is where you should start looking.

Boardburner2

You missed the temperature controlled soldering iron  :)
Good voltmeter £5 these days .
In my day they were £120 (AVO) and that was 30 yrs ago. :o

Robin2

There is a looong discussion in this Thread.

I bought a DS203 and I am very happy with it. I only use it very occasionally and paying more would have made no sense. Also it is small and takes up little space when I am not using it.

I think there is a lot of value in having a device that can work independently of any PC.

...R
Two or three hours spent thinking and reading documentation solves most programming problems.

dally


Boardburner2

#10
Jan 20, 2016, 01:46 pm Last Edit: Jan 20, 2016, 01:47 pm by Boardburner2
Its all relative

Avo was considered top of the range and a £5 from wall mart exceeds those specs these days.

Key is input impedance and even wall mart are 10 M OHM.

Spending more will get more bells and whistles, and a bit more accuracy but not much.

If you are on a budget better to spend on a decent iron IMHO.

dally

Its all relative
of course, it's relative to your purpose
say it's OK if you need a meter to check if your car battery is around 12 Volt


simon1974

Thanks everyone. I'm  still no closer to getting my  money out yet.
I've been looking at rigol 100mhz  and hantek 100mhz 
Modes under £200-GBP and considering that I was only looking at spending half that. Has made me think very hard. So I'm starting to think that the money would probably be better spent at my local college.
I can save up for a really good oscilloscope and keep an eye out for a good deal.


larryd

#13
Jan 20, 2016, 09:58 pm Last Edit: Jan 20, 2016, 10:02 pm by LarryD
Unless you are going to do a lot of work in electronics, just use a logic probe (led with 220R resistor and maybe one that has a pulse stretcher)
http://www.sentex.ca/~mec1995/circ/probe1.htm

No technical PMs.
The last thing you did is where you should start looking.

simon1974

Thanks LarryD I'll build one of those no matter what. I diside to do.  Im more into making things and circuit bending at the moment hence wanting a cheep oscilloscope!!!;-)

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