Products > Test Equipment

AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter

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prof:

--- Quote from: Mark Hennessy on August 31, 2017, 09:59:03 am ---I thought it was clear enough from what I wrote, but for the sake of clarity, I never said that you made the claim, or even that you believed it. I simply said "there is a misconception", meaning that some people believe it, possibly as a result of watching Dave's review...

--- End quote ---

Fair enough.  ;)


--- Quote from: Mark Hennessy on August 31, 2017, 09:59:03 am ---Thanks for telling us which Fluke you have. I don't have one of those, but have been considering picking one up to review for some time now. Or perhaps the 18B+, which has a dedicated LED test function that sources rather more than 3V, so will have an internal step-up converter of some type. Obviously, the 17B+ does not, though of course there will be something in there for the LED backlight, but they've obviously decided to keep that separate.

--- End quote ---

I do find REL/MIN/MAX measurements and temperature much more important than a dedicated LED testing function (I already have dedicated testers, I'm just too lazy to pull it for quick checks while working on a circuit) but YMMV of course.

Mark Hennessy:

--- Quote from: prof on August 31, 2017, 11:13:14 am ---I do find REL/MIN/MAX measurements and temperature much more important than a dedicated LED testing function (I already have dedicated testers, I'm just too lazy to pull it for quick checks while working on a circuit) but YMMV of course.

--- End quote ---

Personally, I just use a bench power supply and a resistor :-+

The PSU is always there on the shelf, as is a range of chunky resistors and other passives that get used for lots of assorted jobs like this. A dedicated tester would take up space, require battery changes and occasional testing, calibration, etc... Overkill really, especially for such a simple task.

Certainly, I've never attached great importance to a DMM being able to light an LED in diode-test mode, especially as the test current varies so much from meter to meter, and is generally only a couple of milliamps at best. But, some reviewers do, which is why I feel I should mention it in my reviews. But then, I see a lot of folk using DMMs when really they should be using a 'scope - it sometimes feels like we're going back to the old days when many people couldn't afford a 'scope :)

But the dedicated LED test function on the Fluke 18B+ is interesting to me. But not for the obvious reason, however. Instead, I'm keen to see what safety precautions they've taken - because an LED tester socket on the front of a DMM is arguably no better than the transistor tester on a DT830 :-DMM

ebastler:

--- Quote from: Fungus on August 31, 2017, 09:04:37 am ---The multimeter seems like a fundamentally wrong way to test continuity IMHO.

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Could you elaborate on that please?  ???

Fungus:

--- Quote from: ebastler on August 31, 2017, 02:46:40 pm ---
--- Quote from: Fungus on August 31, 2017, 09:04:37 am ---The multimeter seems like a fundamentally wrong way to test continuity IMHO.

--- End quote ---

Could you elaborate on that please?  ???

--- End quote ---

As I said earlier, I'd like one with a LED or two in the thing I'm holding in my hand. The LEDs could give much more information than a beep somewhere in the background and would be very easy to focus on as you work. Vision is much faster than sound.

ebastler:

--- Quote from: Fungus on August 31, 2017, 03:43:08 pm ---As I said earlier, I'd like one with a LED or two in the thing I'm holding in my hand. The LEDs could give much more information than a beep somewhere in the background and would be very easy to focus on as you work. Vision is much faster than sound.

--- End quote ---

OK -- a matter of taste, I'd say. I typically like the fact that I can fully concentrate my vision on small PCB contacts, shine a bright light on the PCB etc., and rely on the audio signal when checking for contact.

Having been a radio operator during my navy service (a while ago...), I doubt the "vision is faster than sound" bit as a general statement. Humans can certainly receive and decode morse code via audio at much faster speeds than visually!

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