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bench multimeter for someone learning
2N3055:
--- Quote from: tooki on March 27, 2023, 10:21:39 am ---
--- Quote from: nctnico on March 27, 2023, 08:43:15 am ---
--- Quote from: tooki on March 27, 2023, 07:09:50 am ---
--- Quote from: Martin72 on March 26, 2023, 11:58:24 pm ---Found a test:
--- Quote ---Continuity speed is moderate (About 100ms).
Continuity beeps when resistance is below 30ohm, this is adjustable from 0 to 2000ohm
--- End quote ---
0.1sec...Should be fast enough.
https://lygte-info.dk/review/DMMEastTester%20ET3240%20UK.html
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That is really nowhere fast enough IMHO. Most Fluke meters, like the 87V, detect 1ms shorts (and transient open circuits!). This really is useful when swiping across a row of contacts to find the other end of a conductor, or to identify transient short or open circuits in a cable, for example.
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I agree. 1ms is the 'required number'. Even at 1ms you still hear a 'click' so you know something is there.
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Top-notch continuity functions are latching and will produce a beep long enough to hear. (If I understand it correctly, Fluke even does the reverse, extending a pause in the beeping to make audible a brief open circuit.)
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Respectfully I disagree.. Latched is a personal preference.
I prefer non- latched because i can hear nature of scratching in real time. It is additional info about what is the nature of connection.... You can connect 1.5V battery to audio pot and a slider to an audio amplifier to verify if they are scratchy and noisy...
A bad connection for instance can be oxide in connection or clean break with cold joint. One will have distinct on/off sound (albeit quick) other one will sound exactly like white noise modulated beeper...
With latched beeper I feel like beeper is confused and it will quantize it to some time timings it likes.
It will definitely let you know something is wrong, but you won't be able to hear exactly what..
As I said, my preference for those reasons. I understand you like latched, for some reasons of yours.
Both are useful if done right. Emphasys on "done right" is much more important than latched - non latched in my opinion..
BillyO:
--- Quote from: nctnico on March 27, 2023, 08:43:15 am ---I agree. 1ms is the 'required number'. Even at 1ms you still hear a 'click' so you know something is there.
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Sorry, but that's just ridiculous. No human can even consciously acknowledge an event in less than 150ms. 0.1 second is fine. Anything else is just "pissing in the wind" specification racing.
Fungus:
--- Quote from: BillyO on March 27, 2023, 03:02:21 pm ---Sorry, but that's just ridiculous. No human can even consciously acknowledge an event in less than 150ms.
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Of course they can. Ask any musician...
BillyO:
--- Quote from: Fungus on March 27, 2023, 03:06:33 pm ---Of course they can. Ask any musician...
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Okay, I'll ask myself. 50 years of trombone playing should qualify me. And the answer is no. Following an expected rhythmic pattern is not "reacting" to the unexpected.
nctnico:
--- Quote from: BillyO on March 27, 2023, 03:12:30 pm ---
--- Quote from: Fungus on March 27, 2023, 03:06:33 pm ---Of course they can. Ask any musician...
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Okay, I'll ask myself. 50 years of trombone playing should qualify me. And the answer is no. Following an expected rhythmic pattern is not "reacting" to the unexpected.
--- End quote ---
It is not about reaction, it is about detection! Just hook up a small speaker to a function generator and let it make a 5kHz sine burst lasting 1 ms every second. You'll hear it for sure and that is all that matters.
Edit: swiping a probe along 50 pins of a QFP package takes about half a second. That is 10ms per pin of which a few ms making actual contact. I hope this makes it clear why instant continuity is important to people that need/want to trace signals in equipment for which no schematic is available.
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