Products > Test Equipment
AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
Fungus:
--- Quote from: Gandalf_Sr on July 17, 2017, 11:50:12 am ---[EDIT] What's the resistance of the 1A shunt? If it was 0.001 Ohms then I'm thinking it would be way less than $20 for a 1 Ohm 0.1% resistor.
--- End quote ---
You can calculate it by looking at the burden voltage in the specs.
Normally it won't be a high precision resistor though. It will be medium-precision and the calibration process will cancel out the error. You'll have to rewrite the calibration in the flash memory after you swap the resistor.
evava:
--- Quote from: EEVblog on July 17, 2017, 10:55:06 am ---
--- 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.
--- End quote ---
I only wanted to say, that when someone pointed out this meter has only two shunts, 100 ohms and 0.1 ohms, in that moment was clear some Amps ranges are missing. And then you showed that in your video. Thank you! Then someone pointed out even worse behaviour when measuring AC Amps, which was explained by TRMS conversion. And from that moment on we all know everything about stock AN8008 Amps ranges. We now have no need to discuss stock Amps ranges any more IMHO (except to replace highest Amps range shunt with bigger(more Ohms) shunt to lose 10Amp range for gaining other ranges which are now missing - it might be doable, for $$ obviously))
But me (and others) have other meters for that Amps ranges.
I for example have no reliable and usable meter with 1uV resolution (Fluke 289 failed entirely in that regard despite its price - next time I should read manuals more carefully - 50.000mV 0.05%+20 - ridiculous! Where is LSD digit? And really behaves in this manner! LSD changes itself randomly in the scale +-20 counts!)
I was looking forward to Dave's (Your) 121GW and now this "little gem" appeared :)
I would like to move on to next topic, and that could be logging in my opinion.
mauroh:
--- Quote from: Fungus on July 17, 2017, 11:03:59 am ---
--- Quote from: EEVblog on July 17, 2017, 10:55:06 am ---
--- 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.
--- End quote ---
Maybe they're planning to release another one in a couple of months* with 10mA range and temperature.
Double the sales! :popcorn:
(*) Or after the sales of this one die down.
--- End quote ---
I'm with evava!! If this nice toy will have serial output and temp measurement I'll buy 2 ;D
I don't want wait the next model, where is the hack!!! :popcorn:
Mauro
stj:
--- Quote from: plazma on July 17, 2017, 09:46:55 am ---In the AN8002 model the UART TX signal was not bonded.
--- End quote ---
has that been verified on more than one meter??
matura713:
--- Quote from: mauroh on July 17, 2017, 01:37:46 pm ---
If this nice toy will have serial output and temp measurement I'll buy 2 ;D
--- End quote ---
go back to my previous posts here where with few other members we were discussing information from a Russian forum : temp measurement is simple EEPROM hack - already made and confirmed as working by the Russians - there are even Russian sellers that already sell AN8008 hacked with the temp measurement enabled. As far as the Serial Output goes - if pin 20 of DM1106EN is not used (not connected) on AN8008 board, then it's EEPROM hack to enable the output plus maybe 3 USD for parts (photo-diode, photo-transistor, 100R resistor, 1K2 resistor and UART to RS232 board that are available cheaply). in fact, at least to me the only known DM0660/DM1106EN-based DMM that is not hack-able to add Serial Output is UT139C, as they use pin 20 of the chipset for another purpose.
[EDIT] and for completeness as i am sure someone will ask, here are more details. All credits goes to respective users in "kazus.ru" who shared the information:
* EEPROM address 0xFA, bit 1 is the UART enable/disable bit - that's documented in the datasheet as well:
link click here
as it's activated/deactivated with "a long press on REL button" and there is no such button on AN8008, i guess adding REL button would be similar process of how that is done on VC921:
https://www.eevblog.com/forum/testgear/hacking-the-victor-vc-921/
* EEPROM address 0xAF changed to 0x13 adds Celsius to mA range
* EEPROM address 0xBF changed to 0x15 adds Fahrenheit to mA range
that means, when on mA range and press SELECT, it goes DC, AC, Celsius, Fahrenheit, see the picture here:
link click here
on the picture in Russian it says "BONUS: temperature measurement".
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