Products > Test Equipment
AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
evava:
Guys, calm down.
I like all your answers, they explain many things.
But, IMHO the strongest point of this $19 meter is 1uV resolution, not any of his Amp range. No need to discuss Amp ranges so deeply.
When you look at Wytnucls multimeter spreadsheet, you find just few meters with 1uV resolution.
What I am missing at this meter is logging (whatever RS232, USB, BT) and I think that somebody already enabled logging on this chipset.
That would be something, 1uV resolution meter with logging for $19 - that would become surely UT61e killer.
If there is someone who can do it, please do it!
plazma:
--- Quote from: evava on July 17, 2017, 09:42:59 am ---.......
What I am missing at this meter is logging (whatever RS232, USB, BT) and I think that somebody already enabled logging on this chipset.
That would be something, 1uV resolution meter with logging for $19 - that would become surely UT61e killer.
If there is someone who can do it, please do it!
--- End quote ---
In the AN8002 model the UART TX signal was not bonded. I'll check the AN8008 when I receive it.
Gandalf_Sr:
I'll chip in on the how best to compare the current reading of 2 meters, one of known accuracy, and the other being compared. Kirchoff's second law says that sum of currents flowing into a node is equal to the sum of the currents flowing out of that node; if you only have 2 meters in series then the law says that whatever current flows is the same in both meters.
The only way to do a comparison test (IMHO) is to connect the 2 meters in series. Then I would connect a supply from a power supply and use current limit to get close to the value I want to test, say 1 Amp. Now wait until the readings are steady and record both values. Next do the math to say how accurate is the one under test compared to the good one.
You can't set up the constant current supply and then test, switch meters around, and test again (unless you have a calibrated current source like a Druck). The resistances presented to the supply by a current meter are so low that the resistance of the test lead and banana connectors is very significant and it will likely change just by disconnecting and reconnecting. You can talk about burden voltages all day but, as Mark says, who cares? We're measuring current. An expensive meter will have a lower burden voltage than a cheap one but so what? What matters is that I'm measuring the same current that flows through both meters.
Fungus:
--- Quote from: evava on July 17, 2017, 09:42:59 am ---Guys, calm down.
I like all your answers, they explain many things.
But, IMHO the strongest point of this $19 meter is 1uV resolution, not any of his Amp range. No need to discuss Amp ranges so deeply.
--- End quote ---
The poor mA resolution is only a problem if your life plan is "own exactly one multimeter".
We all know this is 100% impossible so why argue?
EEVblog:
--- Quote from: evava on July 17, 2017, 09:42:59 am ---Guys, calm down.
I like all your answers, they explain many things.
But, IMHO the strongest point of this $19 meter is 1uV resolution, not any of his Amp range. No need to discuss Amp ranges so deeply.
--- End quote ---
The vast majority of electronics works on mA, not uA.
This meter fails to cover the most common current ranges in electronics design with any degree of decent resolution.
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