internal fuse will be blown; The maximum current input to 3A terminal shall not exceed 3.1A, otherwise, the rear panel current input fuse will be blown. IEC measurement class II overvoltage protection. To avoid electric shock, the HDM3000 digital multimeter provides overvoltage protection for line-voltage mains connections meeting both of the following conditions: 1. The HI and LO input terminals are connected to the mains under Measurement Category II conditions, defined below. 2. The maximum line voltage of the power mains is 300 VAC. Warning: IEC II includes electrical devices connected to a mains at an outlet on a branch circuit.
These devices include most small appliances, test equipment, and other devices plugged into branch sockets. The HDM3000 can be used to make measurements where the HI and LO input terminals are connected to power mains (up to 300 VAC) in these devices, or to branch sockets themselves. However, the HI and LO input terminals of the HDM3000 cannot be connected to power mains in permanently installed electrical devices, such as main circuit breaker switchboards, sub-panel disconnected box nor wired motors. These devices and circuits are prone to be in excess of the HDM3000 protection limit. Note:
Voltages over 300 VAC can only be measured in circuits that are disconnected from the main power line. However, there are also transient overvoltages in circuits that are disconnected from the mains. The HDM3000 can safely withstand occasional transient overvoltage up to 1500 Vpk. Do not use the device to measure circuits whose transient overvoltage may exceed this value.