For full technical schematics and manuals, you can access the following resources: The DT830 Series Manual (Scribd) and the Owner's Manual (USP) provide operating instructions and safety specs.
Without the schematic, you might mistake VR1 for a screw holding the case together and destroy it. Dt830d Digital Multimeter Circuit Diagram Pdf Download Pdf
Inside your DT830D, there is one tiny trimmer potentiometer (VR1). The schematic will label this as "ADJ" or "CAL". For full technical schematics and manuals, you can