Feature : 1 . APPLICABLE SCENARIO : Frequency meter can be used in electronic measuring instruments; Traditional manufacturing areas , metrology latory , communication testing and other fields2 . COUNTING FUNCTION : Digital countdown timer recognizes the built in analog count , backward count , and count phases3 . FLEXIBLE AND OPTIONAL : Frequency meter counting speed is optional , optional relay , collector open output , closed memory power supply4 . TIME DELAY OUTPUT : Frequency counter meter supports more than 10 relay types for selection , and has the function of time delay action relay5 . TECHNICAL PARAMETERS : External sensor counter for 5V , 24V DC voltage , can be set 1 . 5x magnification , to determine the ratio between the count and display magnification range 0 . 0001?9 . 9999How to Use : Connect and switch to useSpecification : Item Type : Intelligent Digital Frequency MeterAmbient Temperature : 22?Technical Index : 1 . Measurement Accuracy : ±0 . 1% , Reading : ±1 word2 . Display Mode : 0 . 56 red LED3 . Four digit reading4 . Display Refresh Rate : >3 Times per second5 . Working Power Supply : AC DC8 24V , 40mA6 . Over Range Display : "1" or" 1" is displayed in the first place , and the last three digits are not displayedFunction : 1 . Input Pulse : NPN PNP collector open circuit , switch , non switch , level pulse2 . Input Voltage : Low Level : 30V 0 . 6V , High Level : 4 30V3 . Measuring Range : Frequency : 9999Hz , . 9hz , 99 . 99khz three levels , automatic switching selection4 . Maximum Input Frequency : 10KHz , 100khz , 300khz Package List : 1 x Frequency Meter1 x Connecting Wire