Read: 185 times
Mt Airy, Nc
|#186445 - you are still in trouble|
Responding to: Kai Klaas's previous message
while there are many 'tricks' for when a scope is not available, the "running blinnd" is still, at best, cumbersome.
"the pulse at pin X looks like this" is 1000 times better than "I think there is a pulse at pin X"
I do not think I'm the only one that on a non-technical visit (bringing no instruments) have been asked "now you are here can you have a look at this" and, in some cases I have been succesful. NOTE "in some cases", there are many cases that can not be solved in a reasonable time without proper instrumentation.
Now on a totally different track, I recall an incident in the old minicomputer/TTL days when a brit I consider smarter than myself and yours truly spent more than a month hunting an intermittent which turned out to be a pulse too narrow for the scope of the day to show and we had to resort to the "DNA scope" (loop: reasoning what it COULD be, trying it, back to loop:). We finally, by sheer reasoning, found that when chip x was in the high side of the range, but still within the parameters, under certain circumstances a ~2ns pulse could slip through and the equipmenta would fail ~once a day.
so, yes a scope is essential, but, if you have a month, you can, probably, reason your way to the cause of theproblem.
|ultrasonic receiver problem||Raju M||03/03/12 05:40|
|You really, really need to get an oscilloscope!||Andy Neil||03/03/12 06:12|
|The joys of working blind||Kalpak Dabir||03/03/12 20:21|
|The same way ...||Joseph Hebert||03/04/12 08:07|
|How do you fry an egg with a sledge hammer?||Andy Neil||03/04/12 12:25|
|First?||Michael Karas||03/04/12 23:05|
|First, and always.||Joseph Hebert||03/07/12 21:29|
|If you cannot afford a scope...||Kai Klaas||03/05/12 06:38|
|This is a kind of dip meter||KONSTANTINOS L. ANGELIS||03/06/12 04:24|
|you are still in trouble||Erik Malund||03/06/12 07:31|
|On-line simulator||Joseph Hebert||03/06/12 10:26|
|You need to save up for a scope!||Andy Neil||03/07/12 00:33|
|Microcontroller||Per Westermark||03/07/12 00:51|
|re You need to save up for a scope!||Erik Malund||03/07/12 07:21|
|Yes, perhaps that's the solution||Richard Erlacher||03/07/12 08:56|
|%$#@! -- it happened again!||Richard Erlacher||03/07/12 08:56|
|Multimeters can't troubleshoot everything||Andy Neil||03/23/12 15:41|
|Yes, and you need ...||Richard Erlacher||03/24/12 08:35|