In the digital circuit, the digital frequency meter belongs to the sequence circuit, it mainly by has the memory function trigger constitution.

在数字电路中，数字频率计属于时序电路，它主要由具有记忆功能的触发器构成。

youdao

Measure function: can measure current, voltage, active power, reactive power, frequency, zero sequence current, electric energy, 2 pulse inputs implement watt-hour meter auto read;

测量功能：高精度测量电流电压、P、Q、功率因数、频率、零序电流、计算电度；2路脉冲量输入实现外部电度表自动抄表；

youdao

Measure function: can measure current, voltage, active power, reactive power, frequency, zero sequence current, electric energy, 2 pulse inputs implement watt-hour meter auto read;

测量功能：高精度测量电流电压、P、Q、功率因数、频率、零序电流、计算电度；2路脉冲量输入实现外部电度表自动抄表；

youdao