Products > Test Equipment

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

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alm:

--- Quote from: Fungus on July 16, 2017, 09:31:59 am ---It's always a good idea to own more than one meter anyway, so that:

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To me this meter (for low level measurements) plus a sturdier 3.5 digit meter seem like a sensible combination. You could use the other meter in case you would have to measure dangerous voltages, would need mA ranges or just would need a second meter. Oh, and when you need the relative function :P.


--- Quote from: Fungus on July 16, 2017, 09:31:59 am ---c) You can occasionally check meter readings against each other. If you see a weird reading, how do you know the problem isn't the meter? There's no substitute for a second opinion, even if you own a Fluke 87V (in fact I'd have more overall confidence in my readings if I owned two of these than if I owned a single Fluke)

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This I do not understand. This is not because I think the Fluke 87V is perfect, but because I expect two meters with the same basic design and manufacturer to behave very similar. For example, if it had a design or manufacturing flaw that made it drift (or excessive temperature coefficient), that flaw may very well be in both meters. So I do not think having two of the same provides much improvement in confidence. In statistics terms, I expect the data from the two meters to be highly related, so averaging would gain very little.


--- Quote from: Mark Hennessy on July 16, 2017, 09:39:03 am ---On uA AC, mine was spot-on when compared with a Fluke 87V. Really, no more than 2 or 3 counts away in both ranges, right down to the smallest signals. That impressed me, to be honest.

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I am pretty sure that the Fluke 87V has also its AC specs only apply for more than 10% of range or something like that. So I would not trust the 87V measurements at the bottom of its range either. It may just be that both are similarly off :P. The only way to compare is to measure something that is near full scale on the 87V, but near the bottom of a scale on the AN8008.

Gandalf_Sr:
I ordered an AN8008 from Amazon 2 days ago for $22.59 which includes shipping.

I own several meters that are on my main bench but, as an EE designer, I now keep running into situations where very low (tens of nA) readings are needed and the small size means that I can add it into a workbench test setup without it overpowering the whole setup.

After watching Dave's video, I looked at the Fluke 101 and, while small, I can't see that it is worth the extra money.  Like others here I will test/calibrate the ranges I'm interested in - mainly low DC volts and current - against my Agilent U1252B and Keysight 34461A.

I will take the back off it to check for bad soldering and maybe replace a shunt resistor or two if I get poor accuracy but making custom daughter boards for it seems more effort than it's worth.

Has anyone looked at which components might be prime candidates for upgrades yet?

Fungus:

--- Quote from: alm on July 16, 2017, 09:56:00 am ---
--- Quote from: Fungus on July 16, 2017, 09:31:59 am ---c) You can occasionally check meter readings against each other. If you see a weird reading, how do you know the problem isn't the meter? There's no substitute for a second opinion, even if you own a Fluke 87V (in fact I'd have more overall confidence in my readings if I owned two of these than if I owned a single Fluke)

--- End quote ---
This I do not understand. This is not because I think the Fluke 87V is perfect, but because I expect two meters with the same basic design and manufacturer to behave very similar.

--- End quote ---

It tells you if one of them is broken. Meters break, probe leads break, meters get dirt inside them, etc.

You can also own different brands/models, that's OK.  :popcorn:

Fungus:

--- Quote from: exe on July 16, 2017, 09:21:03 am ---
--- Quote from: Fungus on July 15, 2017, 11:00:17 am ---Edit1: Reading the small print, that meter needs a weird 12V battery.

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I have a similar unit, it uses a 12V battery, same used in many car remotes. Wouldn't call this an issue, but battery costs like half of DMM. I replace it every two-three years or so. It's only 2000 counts, but this is good-enough for most my purposes.

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I think I know the one, it's used in garage door openers, etc. If you open one up it's 8 LR44 button cells in a plastic tube to get 12V.

I found a pic of that meter with the leads attached. It gives a better idea of how tiny it really is.

It looks quite well built for the price. I'm not imagining it's a good meter but it has a continuity buzzer (unlike most DT830B) and it might be $4-worth of fun to pull one out at Arduino club. :popcorn:

(the transistor tester kinda spoils the looks though)

Muttley Snickers:
I interpreted alm's statement to mean that two same meters could both share a vulnerable or blind spot on a particular range, measurement or environment, using a different meter or meters to verify or compare against in my view would be a logical approach in the context of equipment that had not yet proven itself to be trustworthy.   :-DMM :-DMM :-// :phew:

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