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如：U = 220.1V，f = 49.98Hz, I = 1.99A，P = 0.439kW
Such as:U = 220.1V，f = 49.98Hz, I = 1.99A，P = 0.439kW
7.2
计量功能
Calculating
能计量当前组合有功电能，正向有功电能，反向有功电能，正向无功电能，反向无功电
能。
Can measure the active energy、reversing active energy、forward reactive energy、reversing
reactive energy。
7.3
分时功能
Timing
两套时段表，一年可以分为 4 个时区，每套时段表可设 14 个日时段，4 个费率(F1、F2、
F3、F4 即尖峰平谷) 。
Two timing table，four time zone，one table have fourteen timing，four rate。
7.4
需量功能
Demand
有关需量的相关概念如下：
The description about demand:
表 3 需量概念表
Table 3 Demand description list
需量周期内测得的平均功率叫需量
The average power in the demand cycle.
在指定的时间区内需量的最大值叫最大需量
The maximum value of demand in a period of time.
从任意时刻起，按小于需量周期的时间递推测量需量的方法，
所测得的需量叫滑差式需量。递推时间叫滑差时间。
From any time, the method of measuring demand recursively
according to the time less than the demand period is called slip
demand.The recurrence time is called slip time.
连续测量平均功率相等的时间间隔, 也叫窗口时间
The time period between two same average value of demand.
缺省需量周期为 15 分钟，滑差时间为 1 分钟。
能测量 4 种最大需量即正向有功、反向有功、感性无功、容性无功最大需量以及最大需
量发生的时间。
The default demand cycle is 15 minutes, slip time is 1 minute.
The meter can measure 4 kinds of maximum demand: forward active, reversing active,
inductance reactive, capacitance reactive maximum demand and the occur time.
7.5
历史数据统计功能
History data statistics
能统计上 48 月的历史电能（各费率电能）和上 90 日的历史电能（各费率电能）。
The meter can record last 48 months or last 90 days history energy in each tariff.
8 操作与显示 Operation and display
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