Products > Test Equipment
AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
sleemanj:
--- Quote from: matura713 on July 15, 2017, 05:34:09 am ---what I don't understand - considering any DMM based on DTM0660L chipset can be hacked just with changing few bytes in the EEPROM from 6000 to 9999 counts and that is widely known, is there any real difference in accuracy between AN8008 (ZT109) and for example AN8002 (ZT102) hacked to 9999 counts? or hacked HoldPeak HP890CN (the OEM revision of HoldPeak HP-770HC)?
--- End quote ---
For those not aware of the hack that matura713 is referring to, which is for the AN8002 ZT102, and it's various other BM0660L based meters, the translated datasheet here http://www.kerrywong.com/2016/04/03/dtm0660-datasheet-translated/ details the EEPROM data amongst other stuff, which happens to include the # of counts. This post http://kazus.ru/forums/showpost.php?p=1130725&postcount=1874 has a link to a (java) program which supposedly allows changing the eeprom settings in an easy manner, I have not tried it (err, run random executable linked from Russian website... might do that in a virtual machine) so I have no idea how it works.
Note that this is for the DTM0660 based meters, this new AN8008 is supposedly DM1106EN based I think, Google hasn't revealed a datasheet for it.
matura713:
--- Quote from: sleemanj on July 15, 2017, 05:45:21 am ---Note that this is for the DTM0660 based meters, this new AN8008 is supposedly DM1106EN based I think, Google hasn't revealed a datasheet for it.
--- End quote ---
yes, but isn't the chipset/hardware difference only that "square wave output" feature on AN8008 (ZT109)? and everything else is exactly the same? I mean (AN8002 + EEPROM hack to 9999 counts) is equal to (AN8008 - digital square wave feature) or there is real difference in accuracy? (BTW, on first glance even both PCBs of AN8008 and AN8002 looks very very similar).
in any way, I am sure soon people will release EEPROM dumps from AN8008 and there are such from AN8002 for a long time, as well everyone having any of those DMMs can make EEPROM dumps very easy.
in any way, what I would be interested to see is comparison with any of the previous DTM0660-based meters hacked to 9999 counts and AN8008, because for example for only several USD more you can get UT139C, hack it to 9999 counts and that has adequate quality and input protection as well.
--- Quote from: sleemanj on July 15, 2017, 05:45:21 am ---
This post http://kazus.ru/forums/showpost.php?p=1130725&postcount=1874 has a link to a (java) program which supposedly allows changing the eeprom settings in an easy manner, I have not tried it (err, run random executable linked from Russian website... might do that in a virtual machine) so I have no idea how it works.
--- End quote ---
you can always use hex-editor and modify your EEPROM dump manually, but in general I guess for most people here it's ultra simple hack: dump the EEPROM of your DTM0660 based DMM, modify it, write it back to the EEPROM chip in your DMM.
sleemanj:
--- Quote from: matura713 on July 15, 2017, 06:03:30 am ---in any way, I am sure soon people will release EEPROM dumps from AN8008
--- End quote ---
http://kazus.ru/forums/showpost.php?p=1126917&postcount=1827
matura713:
--- Quote from: sleemanj on July 15, 2017, 06:13:10 am ---
--- Quote from: matura713 on July 15, 2017, 06:03:30 am ---in any way, I am sure soon people will release EEPROM dumps from AN8008
--- End quote ---
http://kazus.ru/forums/showpost.php?p=1126917&postcount=1827
--- End quote ---
haha, yeah, the Russians already did it and Google translates the comment in Russain there to "that this is a complete analog DTM0660, well or some advanced version."
which is exactly my point and suspicion, either the same or maybe the same + square wave generator. So, for me the only question - is there any real difference in accuracy compared to DTM0660 hacked to 9999 or not. Because if not, then there are much better DMM for basically the same money than AN8008.
[EDIT] I Google translate more from the Russian forum: what I got is adding temperature hack to AN8008 is the same as for DTM0660, i.e. the same bytes in the EEPROM.
also, a note was made there that EEPROM of DMM model "BSIDE ADM08" has in its EEPROM data for the mode setting that are not consistent with and described in the datasheet, but i believe "BSIDE ADM08" is DTM0660-based and they mentioned that to make a point DTM0660 datasheet that is floating around is simply not complete.
kalel:
I'm also interested in any differences between a modded AN8002 and this. I also don't know if the lower models that look the same on the outside perhaps also use the chip (e.g. AN8000/8004).
--- Quote from: matura713 on July 15, 2017, 06:03:30 am ---in any way, I am sure soon people will release EEPROM dumps from AN8008 and there are such from AN8002 for a long time, as well everyone having any of those DMMs can make EEPROM dumps very easy.
--- End quote ---
But, I'd also like to add that not everyone (as in 100%) here can easily dump and flash EEPROMs. Maybe it's almost everyone, but perhaps someone who is not so experienced with flashing also bought the multimeter? :)
I don't even have a dumping and flashing tool (I guess those might be cheap and USB based these days), and if I did, wouldn't know the procedure (e..g. if I have to desolder/resolder the chip, or attach some jumper wires, or even do it in circuit without disconnecting things). Someone did mention a bit about it here, and there might be tutorials either for the specific multimeter or just general procedure, so it might be possible, but anyhow still seems like a risky prospect unless you're experienced.
That said, I'm carefully reading and considering all of the info here. To me, most of the AN models seem pretty great, even the 6000 count ones (with temperature -8002).
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