Noise (electricallinenoise): Refers to radio frequency* (RFI) and electromagnetic* (EFI) and various other high frequency*, motor operation, relay operation, motor controller operation, broadcast transmission, microwave radiation, and electrical storms, etc. Will cause noise.　　

frequency drift (frequencyvariation): refers to the change of the mains frequency exceeding 3Hz, which is mainly caused by the unstable operation of the emergency generator or the power supply of unstable frequency.

voltage is too low (brownout): refers to the effective value of the mains voltage is lower than the rated value, and lasts for a long time, its causes include: large equipment startup and application, main power line switching, starting large motors, line overload, etc.

Mains power interruption (powerfai1): refers to a situation where the mains power is interrupted and lasts for at least two cycles to several hours. The causes are: circuit breaker tripping, mains supply interruption, grid failure, etc.

SNMP: is the English abbreviation of Simple Network Management Protocol (SimpleNetworkManagementProtocol). Its meaning is to allow computers and peripherals to directly connect to the network without going through the computer, and allow the network system to manage it. High-end UPS usually has an optional SNMP network management interface, which allows the UPS to easily connect to the network.

IGBT: It is the English abbreviation of InsulatedGateBipolarTransistor. IGBT is a kind of power crystal. UPS with this crystal design can effectively improve product performance, resulting in good power quality, high efficiency, low heat loss, low noise, small size and long product life.

Isolation transformer: It means that when equipment is used in conjunction with a general UPS, it often causes problems such as equipment* or malfunction due to the zero-ground voltage of the electrical characteristics. In order to avoid this situation, some high-end UPSs are designed to solve this problem by designing a UPS with an isolation transformer design. With special design and cooperation, the output zero-ground voltage can be less than 1 volt and avoid the above problems. In addition, it also has functions such as noise filtering.

AVR: is the English abbreviation of AutomaticVoltageRegulation. AVR is the meaning of automatic voltage adjustment, that is, the UPS can adjust the coil turns of the internal output transformer or process the power electronic components for the input voltage, so that the UPS has a wide mains input range and stable output voltage characteristics.

Power regulation rate: The voltage regulation accuracy of the output terminal when the input changes.

Communication protocol: The rules that interconnected devices abide by in data exchange.

SNMP: The English abbreviation of Simple Network Management Protocol, which is mainly used for monitoring, fault query and control of TCP/IP networks, and provides a simple network management protocol for user data programming.

Input frequency range: The standard frequency of my country's power grid is 50Hz. UPS allows the mains frequency to have a certain range of variation. Within this range, the UPS synchronously tracks the mains frequency, and if it is exceeded, it will output at the local frequency.