and the maximum line voltage does not exceed 540V(three-phase three-wire),Suitable for specific
occasions
1.4 Model composition and meanings
Figure 1 Model composition and meanings
1.5 Applicable environmental condition
1.5.1 Temperature range
Indoor type:
Regulated working temperature range: -10℃～+45℃；
Limited working temperature range: -25℃～+75℃；
1.5.2 Relative humidity(Annually average):≤75％RH；
1.5.3 Atmospheric pressure: 63.0kPa～106.0kPa( altitude 4km and below), excepting the requirements
for special orders.
2. Working Principle
The instrument are composed of high accurately integrated circuit specially for measurement
(ASIC) and managing MCU, memory chip, RS485 communication module, etc.
The working principle block diagram of the instrument is shown in figure 2
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