Products > Test Equipment
AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
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stj:
that's why it's called "calibration"  :-DD
solidhit:
All right, my meter is now calibrated temperature-wise.

FYI, I used "FA 00 C0 CE 03" . "F0 00 48 CE 03" works as well. "E6 00 00 BD 03" results in overshoot +5 degrees C.

Once again, thank you very much stj for your kind interest.
solidhit:
There is one last thing I want to do before I leave my AN8008 alone.

There is some missing functionality button-wise:

RANGE - There already is a range button but it doesn't work as it should, I want a separate button.
MIN/MAX - That's very useful to have.
REL - This is necessary to turn on serial communication. I've already set eeprom address 0xFA to value 0xCE to allow that.

I will need to make a few holes to add these buttons as well as one for the comm. wires (I don't want infrared leds) but I've already figured out the best way to do that on the meter case thanks to our friends in the various Russian forums.

Now, this is were I get confused and need your help.

This is the diagram I use to understand how the DMM processor is connected to the pcb:
https://media.licdn.com/mpr/mpr/AAIA_wDGAAAAAQAAAAAAAAqmAAAAJDA3Nzc5MDhiLTliZjMtNGY0Zi05OTcwLWExZjY2ZjU4YTczYg.jpg

Questions:

* I notice how the buttons are connected to the processor and I come to the conclusion that if for example I want to let the processor know that MIN/MAX was pressed all I have to do is to temporarily connect PIN 23 (PT1.1) to PIN 26 (PT3.7). Is it that simple or is there something else I'm missing?
* I can see that PIN 20 is my TX PIN which I can use to send data to my PC. But I can also see that PIN 21 is an RX PIN.  Do I need that?
* Finally, is there anyone who knows where the PTx.x PINS that have to do with the aforementioned buttons are located on the 8008 PCB? Since this is a COB chip, I reckon it's a bit of a guessing game to locate the pins you are interested in. I will also need to locate the TX PIN.This button issue is confusing to me because for example on the top right of the PCB there are contacts for a button (I think it's supposed to be a RANGE button?) and all it does is nothing (connects PT1.1 to BATT-). Why do they have contacts for a button that seems to do nothing? Is there something I'm missing with the whole button setup?

I have also watched this video:


It's a Russian guy who mods a ZT102 (AN8002) meter to add buttons. The points on the PCB he marks on his video to get specific button functionality, don't do anything on my AN8008 but work fine on his meter. This confuses me even more!

I would appreciate any response to help clarify these things.
stroma:
As far as I know additional buttons hack on AN8008 is not possible.
You can find more info on the topic reading previous posts in this thread.


--- Quote from: plazma on August 04, 2017, 12:35:50 pm ---I tested some button options for the AN8008.
SET/HOLD is PT1.0 - BAT-
RANGE/BackLight is PT1.2 - BAT-

These did not have any effect.
PT1.0 - PT1.1
PT1.0 - PT1.2
PT1.0 - SDA
PT1.1 - BAT-
PT1.1 - PT1.2
PT1.1 - SDA
PT1.2 - SDA

So no button hacks found. There are still some possible pins but I think all other button options are disabled in FW.
Only temperature  probe is hackable.

IMHO AN8002 is a better option for general use and AN8008 is only better in those small ranges.

--- End quote ---
solidhit:
Thank you stroma (in Greek, this name means mattress!)

If the quote from plazma stands, this is great!

It means we can hack the eeprom to reactivate the disabled button functionality.

But all I have, is the translated (by Kerry Wong) datasheet of DTM0660 and in the eeprom analysis, I can't find anything that refers to enabling/disabling such buttons!

EDIT: I wonder if it's the DM1106EN (used in an8008, improved DTM0660) that allows enabling/disabling button functionality. The ZT102 uses the DTM0660. I could find no datasheet for DM1106EN anywhere.

EDIT2: I spent many hours bombarding undocumented eeprom addresses with all sort of data to see if that changes anything towards making the various TPx.x points behave like in the ZT102 model. Nothing! If they limit the use of extra buttons, they must have done it in a different way. I don't know if this meter's CPU contains a firmware or not. I don't know if the limitation is in that firmware or there is something else on the PCB that makes the meter behave this way.
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