EN Safety Requirements 1.3 Measurement Category Measurement Category The instrument can operate under measurement category Ⅰ . Warning: This instrument can only be used for measurements within its specified measurement categories. Definitions of measurement categories Measurement Class I refers to measurements made on circuits not directly connected to the main power supply. For example, circuits that are not derived from the main power supply, especially from the protected (internal) main power supply. In the latter case, instantaneous stress changes. Therefore, the user should be aware of the instantaneous capacity of the device.
Measurement Class II refers to measurements made on circuits directly connected to low voltage equipment. For example, household appliances, portable tools and similar equipment. Measurement Class III refers to measurement in construction equipment. For example, switchboards, circuit breakers, circuits (including cables, busbars, junction boxes, switches, sockets) in fixed equipment, equipment for industrial use, and other equipment (for example, fixed motors permanently connected to fixed equipment). Measurement class IV refers to measurement at the source of low-voltage equipment.
For example, electricity meters, measurements on primary overcurrent protection equipment, and measurements on pulse control units. 1.4 Working Environment Temperature Operating: 0 ℃ - 50 ℃ Non-operating: -20 ℃ - 60 ℃ Humidity ≤+104 ℉ (≤+40°C): ≤90%RH 106 ℉ ~122 ℉ (+41°C ~50°C): ≤60%RH Copyright Qingdao Hantek Electronics Co., LTD HTM200 user manual 3