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Hacking the Victor VC-921

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TheRadioGeek:
You will need a SOIC 8 dip to clip cable. see photo. You hook up the cable to the ZIF socket on the programmer and clip the other end on the legs of the EEPROM on the PCB. Make sure pin 1 is lined up with pin 1 on the cable. Red stripe is pin 1 on the cable. On the programmer pick Atmel 2402 and hit the read button. Save what you read  from the chip to a bin file just in case you mess things up and need to load it back into the chip. Make your changes by clicking on the address you want to change and typing in the values you want. Now push the program button and you should be all set.  I got my cable on Amazon for about $10 but I'm sure you can find it on Ebay too. Try a search for SOIC 8 clip programming cable.

Hope that helps. 8)
Good luck.

 

Rbastler:

--- Quote from: TheRadioGeek on September 01, 2017, 11:42:15 pm ---You will need a SOIC 8 dip to clip cable. see photo. You hook up the cable to the ZIF socket on the programmer and clip the other end on the legs of the EEPROM on the PCB. Make sure pin 1 is lined up with pin 1 on the cable. Red stripe is pin 1 on the cable. On the programmer pick Atmel 2402 and hit the read button. Save what you read  from the chip to a bin file just in case you mess things up and need to load it back into the chip. Make your changes by clicking on the address you want to change and typing in the values you want. Now push the program button and you should be all set.  I got my cable on Amazon for about $10 but I'm sure you can find it on Ebay too. Try a search for SOIC 8 clip programming cable.

Hope that helps. 8)
Good luck.

--- End quote ---

Yes, that did help !  :-+
Didn't knew you could modifie EEPROM content in the MiniPro software.
I bought a Soic adapter cable, when I bought the VC921 on Aliexpress, so no problems there.

Rbastler:
Here my successful attempt at modifying the EEPROM for more counts plus a comparison to my Fluke 8050A measuring a quick and dirty AD584 reference:

TheRadioGeek:
Nice photos of the modified meter in action. I am glad you got it all working. I got mine set to 8000 count as well. I made a how to video if anyone wants to see how its done. DO THIS AT YOUR RISK.



Its kind of neat that you can change this stuff!!  Fun fun  :-+ :-DMM

necromncr:
Just wanted to add - Zotek ZT102 has a button placeholder on the back of the PCB called RANGE. It actually works and switches AUTO to MANUAL range mode!

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