Logic Analysers

[Paul Berger]

On 2017-02-03 3:47 PM, Tony Duell wrote:
> On Fri, Feb 3, 2017 at 7:04 PM, dwight <dkelvey at hotmail.com> wrote:
>> I think Tony's statement about the key thing to know about
>>
>> trouble shouting is to know what it should be doing.
>>
>> If you don't know that, no scope or logic analyzer with help much.
> Yes. I once explained faultfinding in this way. The technical manual,
> schematics, microcode listings, etc should tell you what the device
> should be doing. The instruments tell you what it is doing, you need
> test instruments becuase you can't directly 'see' electrical signals.
> You then have to compare the two and work out what could cause
> the problem.
>
> There is no magic box that you plug into a computer and it tells
> you 'U5 is faulty'. At least not in general.
>
> As I have said before, the most important piece of test gear is a
> brain.
>
> -tony
...And if you don't have a schematic, you ring out the connections and 
draw your own...

Paul.