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| Low end PC-compatible Logic Analyzer suggestions |
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| MathWizard:
I don't need a $400-500 LA, but I don't want a $20 one either. And I don't want a $20 one sold for $100 either. What do people recommend these days ? And what makes the good ones so expensive ? |
| tggzzz:
--- Quote from: MathWizard on September 03, 2022, 03:36:24 pm ---And what makes the good ones so expensive ? --- End quote --- Sampling rate, width, competent signal integrity. Plus, of course triggering and capturing filters so you don't even see all the irrelevant data that is inhaled by the cheap LAs. Optionally protocol analysis, but that can often be done with computers and printf() statements. Without the filters and signal integrity, all else is in vain. |
| switchabl:
--- Quote from: MathWizard on September 03, 2022, 03:36:24 pm ---I don't need a $400-500 LA, but I don't want a $20 one either. --- End quote --- What specifically do you need and what do you want to do with it? Are you looking for a stand-alone or PC-based LA? How many channels? What protocols or busses do want to look at (and at what speeds)? Do you want analog capability on some/all channels? Do you need to capture very long sequences (which may require either deep memory or high-bandwidth USB streaming)? |
| tggzzz:
--- Quote from: switchabl on September 03, 2022, 06:03:29 pm ---Do you need to capture very long sequences (which may require either deep memory or high-bandwidth USB streaming)? --- End quote --- Very long sequences can usually be avoided by decent filtering in realtime, so that irrelevant stuff is neither captured nor stored. Examples: * check setup and hold times are valid, by storing nothing until an invalid timing is found * only capture state changes (plus time interval), not all the crap that occurs between successive clocks * verify maximum latency between event and action is observed by only capturing failures Decide whether you need protocol analysis, i.e. the semantic content of sequences of messages and responses. If so, a conventional LA is probably the wrong tool. |
| Fungus:
a) What do you need to analyze? would be a good start.... |
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