Products > Test Equipment

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

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Mark Hennessy:
The Bside ADM08A appears to use the same DM1106 chip, and has 4 current ranges...

crazyguy:

--- Quote from: Mark Hennessy on July 18, 2017, 12:25:26 pm ---The Bside ADM08A appears to use the same DM1106 chip, and has 4 current ranges...

--- End quote ---

I think DM1106EN and DTM0660 are the same chip, someone reported that Uni-T UT210E already changed the chip to DM1106EN last year.



The real name of the chip should be Hycon HY12P66. Hycontek just sell the customized chips to their customers.

matura713:

--- Quote from: crazyguy on July 18, 2017, 01:29:38 pm ---
I think DM1106EN and DTM0660 are the same chip, someone reported that Uni-T UT210E already changed the chip to DM1106EN last year.



--- End quote ---

the common opinion is that DM1106EN is actually improved new version of DTM0660, at least based on what i read in the Russian forum "kazus.ru" using Google translate, as it was pointed out here several posts back - while DTM0660 can be patched via EEPROM hack to 9999 counts it works reliable only when it's patched up to 8500 counts. yeah, the EEPROM for DTM0660 is fully compatible with DM1106EN, i don't know if they are pin-to-pin compatible, but in any way no any significant changes are needed to do what UNI-T did with UT210C - update it from DTM0660 to DM1106EN, as it's sold as 6000 counts meter and they did not even need EEPROM update.

so, the EEPROM structure and almost all the settings are the same for DTM0660 and DM1106EN, there are already available EEPROM dumps from AN8008 and ADM08A in the aforementioned Russian forum and it's easy to figure out EEPROM settings considering their features and the available DTM0660 datasheet, the one translated in English is not very full, but there is one in Chinese. most good source is EEPROM of ADM08A as it contains some settings that cannot be explained via the DTM0660 datasheet, i.e. those are new bits for DM1106EN new features.


--- Quote from: crazyguy on July 18, 2017, 01:29:38 pm ---
The real name of the chip should be Hycon HY12P66. Hycontek just sell the customized chips to their customers.

--- End quote ---

again, the common opinion is DTM0600 and DM1106EN are cheap clones of Hycon HY12P66, that's why there are so cheap DMMs with them compared to the one that has original Hycon HY12P66 inside.

[EDIT] and here are EEPROM dumps:

* ADM08A EEPROM:
http://kazus.ru/forums/showpost.php?p=1126912&postcount=1825

* AN8008 EEPROM:
http://kazus.ru/forums/showpost.php?p=1126917&postcount=1827

BTW, ADM08A sells for 18-19 USD and it's much solidly build than AN8008:



but at least I cannot find anyone who patched ADM08A to 9999 counts via modifying the EEPROM and evaluate its work. that would be definitely interesting.

free_electron:

--- Quote from: ocw on July 17, 2017, 11:56:41 pm ---I modified my AN8008 to provide single digit mA readings with 3 digit resolution.  I replaced the regular mA/A readings with the ability to measure currents below 100 mA with a XX.XX mA display.  Currents below 1A are measured with the same XXX.X mA display.  1A is now the maximum current which can be measured.

I replaced the 0.01 ohm shunt resistor for the A/mA jack with a 0.10 ohm 0.5% resistor which I had in stock.  Attached is a picture of the upgraded meter measuring 2.5000 mA current.  On the left the meter is in the uA position, the test lead is in the A/mA jack and the meter reads 2.59 (uA) [3.6% high].  On the right I've switched to the mA position but the reading has gone down to 21.9 (mA) [12.4% low].  I obviously haven't corrected the position of the decimal.  Remember, the actual current through the meter is 2.5 mA is both cases.

About a 0.12 ohm resistor will correct the magnitude of the of the reading when the meter's switch is in the mA position.  But, I prefer having the decimal point in the correct position.  Being in the A/mA jack will remind me that mA is the actual display units.  I might purchase some 0.10 ohm resistors with less precision hoping to get one a bit low in value which will improve the mA reading's accuracy when the meter's switch is in the uA position.

--- End quote ---

how about calibrating it instead ? the eeprom holds calibration data. These machines do not bank on the precision of the resistors. they apply mathematical compensation.

cjs:

--- Quote from: matura713 on July 18, 2017, 02:13:19 pm ---BTW, ADM08A sells for 18-19 USD and it's much solidly build than AN8008....

--- End quote ---

I've got the Peak Meter branded version of that (the PM18C) and it's a pretty nice meter that works well. But I doubt it would appeal at all to the AN8002/8008 audience; it's about four times the size and manual ranging.

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