Products > Test Equipment

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

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ocw:

--- Quote ---Mine is better than yours here as well. I wonder if I'm lucky, you're unlucky... On uA AC, mine was spot-on when compared with a Fluke 87V.
--- End quote ---

Perhaps I rate current measurement accuracy in a different way.  Putting two meters in series makes the limitations of both meters influence the other.

I connect a 0.01% accuracy resistor in series with a voltage measured with 0.0015% accuracy and measure the current with a single meter to see how that compares with the current based on Ohm's Law.  That's what I call real world current.  Good meters are accurate without any correction required.  A current to voltage converter using a ADA4530-1 IC which I made doesn't need any correction.  I have tested it on measuring the current from a 1,000 volt power supply without having any problems.

I realize that $20 meters can't meet that standard.  However, we are at the point where maybe a $500, definitely $1,000+ meters should.  After making the above measurement, I correct it by taking the meter's shunt resistance into account.  That produces a figure which should at least meet the manufacturer's specifications.  But, if the meter is measuring a current which doesn't have a linear voltage to current relationship, it may be impossible to translate a measured current to the actual one.  The same is true if accurate voltage regulation is required.

While all of this isn't that important for a $20 meter, I still evaluate equipment the same way.  The manufacturers will keep making meters with compromised accuracy until meter reviews start measuring real world current which doesn't require you get out your slide rule to translate.

Back to the AN8008--while a 2 uA AC current measurement with reasonable accuracy is possible, 2 mA is not.

Fungus:

--- Quote from: exe on July 16, 2017, 01:44:48 pm ---
--- Quote from: Fungus on July 16, 2017, 10:37:18 am ---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:

--- End quote ---

Well, voltage readings were spot-on (+-1 count) after 8 years without any calibration (guess it's not too hard make an accurate 2000 counts DMM). Actually, after my own calibration it become worse :(. So, a totally usable device to me when resolution is not needed (most of the time for me). And yes, I used it on mains as well, although I hesitated holding it in my hands. But it did the job well.

--- End quote ---

OK, I'm getting one. Just for the LOLs.

kalel:

--- Quote from: Fungus on July 16, 2017, 03:47:54 pm ---
--- Quote from: exe on July 16, 2017, 01:44:48 pm ---
--- Quote from: Fungus on July 16, 2017, 10:37:18 am ---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:

--- End quote ---

Well, voltage readings were spot-on (+-1 count) after 8 years without any calibration (guess it's not too hard make an accurate 2000 counts DMM). Actually, after my own calibration it become worse :(. So, a totally usable device to me when resolution is not needed (most of the time for me). And yes, I used it on mains as well, although I hesitated holding it in my hands. But it did the job well.

--- End quote ---

OK, I'm getting one. Just for the LOLs.

--- End quote ---

Good luck. I'm sure you will be happy (considering the expectations, not much can go wrong).
If buying, check it on Ali, I see a really good price right now (better than eBay, but this changes every moment).

Still, it has some tough competition such as DT 383 for $4 with K-type probes included and temperature measurement (no battery stuff though) and the DT700D with a large display and no temperature or battery stuff. Going further with price, a lot of things appear, but then we're getting closer and closer to AN8002.

Fungus:

--- Quote from: kalel on July 16, 2017, 04:02:19 pm ---Still, it has some tough competition such as DT 383 for $4 with K-type probes included and temperature measurement (no battery stuff though) and the DT700D with a large display and no temperature or battery stuff. Going further with price, a lot of things appear, but then we're getting closer and closer to AN8002.

--- End quote ---

Both huge compared the ANENG.  ::)

kalel:

--- Quote from: Fungus on July 16, 2017, 04:11:30 pm ---
--- Quote from: kalel on July 16, 2017, 04:02:19 pm ---Still, it has some tough competition such as DT 383 for $4 with K-type probes included and temperature measurement (no battery stuff though) and the DT700D with a large display and no temperature or battery stuff. Going further with price, a lot of things appear, but then we're getting closer and closer to AN8002.

--- End quote ---

Both huge compared the ANENG.  ::)



--- End quote ---

True.



It's a bit huge. Who would have considered 830D to be huge? :)

Maybe it's similar size to this expensive UYIGAO? $10, that's almost AN8002 price league.



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