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service manual
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Eduad:
 Hello. I have a repair here with DVM645BI multimeter, someone has service manual for my. Photos follow, thanks
coromonadalix:
ask velleman ?

Sold iunder this name   Velleman DVM645BI

and maybe other names ...

https://cdn.velleman.eu/downloads/1/dvm645bisoftware.rar
control software attached. remove the txt  extension  it's a rar file


the best thing is open the meter and search for the main  dmm ic       many Mastech have Fortune Semiconductor, or maybe Cyrustek   ic's

examples here :  https://sigrok.org/wiki/Multimeter_ICs
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