Products > Test Equipment

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

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Fungus:

--- Quote from: tronde on July 15, 2017, 04:27:47 pm ---The datasheet says battery test for 9V and 1.5V. I guess 40mA load for 1.5V and 24mA for 9V.

--- End quote ---

More useful than a square wave output!  :)

(Now I need one of those as well.  :scared: )


PS: Do you think I should send one to Batteroo for their test lab?

kalel:

--- Quote from: Fungus on July 15, 2017, 04:59:59 pm ---
--- Quote from: tronde on July 15, 2017, 04:27:47 pm ---The datasheet says battery test for 9V and 1.5V. I guess 40mA load for 1.5V and 24mA for 9V.

--- End quote ---

More useful than a square wave output!  :)

(Now I need one of those as well.  :scared: )


PS: Do you think I should send one to Batteroo for their test lab?

--- End quote ---

That is the cheapest meter I see with battery tester ($3.7).
I just wonder where do you install the fuse as suggested:


Edit: Maybe the little spot below the screw on the right? - Looks like a diode sign.

Speaking of small meters, this one has a nicer (larger) display:


But otherwise it's has no battery testing.

Fungus:

--- Quote from: kalel on July 15, 2017, 05:16:08 pm ---I just wonder where do you install the fuse as suggested:


--- End quote ---

The PCB trace goes up under the buzzer. I expect that's where it is.  ;)

I like the way you can take the back off without stressing the wires going to the buzzer. A buzzer holder costs money, it's good to see they aren't cutting any corners. :popcorn:

SeanB:
They probably could get the complete piezo with the casing and leads cheaper than the cost of the bare piezo, the added mouldings in the case dies along with the 3 stakes or drops of glue and the 2 springs.

Mark Hennessy:

--- Quote from: ocw on July 15, 2017, 04:42:01 am ---As somewhat referred to previously, the AN8008 is a poor meter to use between 1 - 100 mA.  I just completed my detailed accuracy verification of the lower current readings.  For an approximately 1 mA current reading I had the choice of 989.8 uA (1.01% low due to the 100.561 meter insertion resistance) or 1.0 mA.  Yes, that's two digits, 10% error represented by the least significant digit.  That's the best resolution possible just above 1 mA.  The -1% uA error continued down to around 200 uA.  When the reading was corrected for the added resistance, the uA accuracy was typically below 0.1%.

The DC voltage reading accuracy was typically 0.06%  The resistance reading accuracy was typically below 0.3%.  Most of my resistors used for accuracy verification were rated at 0.01% accuracy.

More tests tomorrow.

--- End quote ---

I got slightly better results from mine.

In uA, the error varied between -0.25% and -0.47%.

In mA, mine met the 1.5% spec. The worst error was at 5mA, where I got 4%, but of course, 1 count is 2% at 5mA. Factor in the "3 counts" part of the specification, and 5.2 is indeed OK for 5.0mA. Elsewhere, it was comfortably within 1%.

Down at the sub-10mA end of the scale, the voltages from the 0.01 ohm shunt are tiny, resulting in 10uV per milliamp - so they're really taking advantage of the high voltage resolution/sensitivity to achieve this. The AN8002 certainly does better in the 1-10mA range, but of course lacks uA.

Personally, I would have preferred it if they'd not bothered with the square wave output, and used the switch position for mA, with a different shunt.

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