Features 1、APPLICABLE SCENARIO: Frequency meter can be used in electronic measuring instruments; Traditional manufacturing areas, metrology laboratory, wireless communication testing and other fields 2、COUNTING FUNCTION: Digital countdown timer recognizes the built in analog count, backward count, and count phases 3、FLEXIBLE AND OPTIONAL: Frequency meter counting speed is optional, optional relay, collector open output, closed memory power supply 4、TIME DELAY OUTPUT: Frequency counter meter supports more than 10 relay types for free selection, and has the function of time delay action relay 5、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 0.0001‑9.9999 Specification Item Type: Intelligent Digital Frequency Meter Ambient Temperature: 22℃ Technical Index: 1. Measurement Accuracy: ±0.1%, Reading: ±1 word 2. Display Mode: 0.56 red LED 3. Four digit reading 4. Display Refresh Rate: >3 Times per second 5. Working Power Supply: AC DC8-24V, 40mA 6. Over Range Display: "1" or" -1" is displayed in the first place, and the last three digits are not displayed Function: 1. Input Pulse Signal: NPN PNP collector open circuit, contact switch, non contact switch, level pulse 2. Input Signal Voltage: Low Level: -30V-0.6V, High Level: 4-30V 3. Measuring Range: Frequency: 9999Hz, 999.9hz, 99.99khz three levels, automatic switching selection 4. Maximum Input Frequency: 10KHz, 100khz, 300khz Package List 1 x Frequency Meter 1 x Connecting Wire