DFF Digital Frequency Meter 

DFF Digital Frequency Meter Ⅰ、Survey： D series intellective electric meter（Digital Ammeter、Digital Voltmeter、Frequency Meter、Tachometer and so on）is a type of multifunctional composite type meter, it apply to electric power and electric network, field monitoring and display of automatic control systems and remote control and measurement of automatic dispatch telemechanical device，its function is to output  standard current or voltage transfer signal using CPU operation electric network’s parameter, such as current、voltage、3 phase power、frequency and so on，and then A/D’s conversion. Also this meter has RS232 or RS485 communication interface be joined with long range data terminal TRU. Ⅱ、Main technical specification 1、Accuracy Class： 0.5%F·S±1B 2、Display Digit：4 3、Reference Input：AC /AV：0～5A/0～500V   volts D.C.：0～199.9V   0～1000V 4、Power consumption：≤3W 5、Worki…

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