1. Paub meej ua ntej ntsuas, kom tsis txhob hlawv lub ntsuas hluav taws xob vim qhov ua haujlwm tsis raug (xws li ntsuas qhov ntsuas hluav taws xob nrog cov iav tam sim no);
2. Tsis txhob tshaj qhov ntau yam (piv txwv li, yog tias qhov tam sim no ntau ntawm ntau lub multimeters tshaj qhov tam sim no, lub fuse lossis multimeter yuav kub hnyiab, thiab qhov ntsuas qhov voltage tib yam yuav tsum tsis pub tshaj 1000);
3. Lub desktop multimeter kuj yuav tsum tau them sai sai rau qhov input voltage ntawm lub hwj chim mov, thiab nws yuav tsum ua tib zoo ua ntej nws yuav tsum tau powered.
