| 摘要 |
A voltage reference selector, used in conjunction with a multi-meter, allows user selection of a reference voltage to be used by the multi-meter from three different reference voltages of an electrical control panel when taking electrical measurements from the electrical control panel via the multi-meter. A portable voltage reference selector can be carried with and electrically connected to a multi-meter and be temporarily electrically connected to voltage reference points of an electrical control panel for taking electrical measurements from the electrical control panel with the multi-meter. In this form, a test lead from the multi-meter is used to obtain electrical measurements from the electrical control panel. A permanent voltage reference selector is permanently connected to voltage reference points of an electrical control panel and is electrically connectable to a multi-meter for taking electrical measurements from the electrical control panel with the multi-meter. In this form, a test lead of the voltage reference selector is used to obtain electrical measurements from the electrical control panel. |
