Description: Master by the United States Microchip (Microchip) PIC16F648A as the core of 65MHz frequency counter. Japan KDS frequency reference temperature-compensated voltage controlled crystal oscillator (± 2.5 ppm VC-TCXO).Unique gate control and precise time algorithm (non-timer interrupt) Gate (display refresh) time 0.64 seconds, real-time display frequency value.Frequency measurement accuracy 10Hz / 100Hz (digital right one) is optional. Dual IF design, IF value and plus / minus preset mode can be used alone, independently of each other. Display driver with LED display special chip, high brightness digital tube, less foreign interference. ARK six .56 inches using digital display, automatic blanking invalid zero, eight adjustable brightness. Circuit is simple and reasonable structure, two-button control, simple operation. The settings are automatically saved, boot directly invoked Specification: Gate time: 0.64 Second. Measure the channel: Input Impedance: high resistance Measuring range: 1 MHz to 1000 MHz Accuracy: 100 Hz / 1000 Hz. Sensitivity: HM8134-2 test data (for reference only) Frequency reference Warming 13.000MHz 5032 package uses voltage controlled crystal oscillator (VC-TCXO), frequency stability of ± 2.5 ppm. Operating voltage DC Input: DC 8V ~ 12V (recommended 9V) Working Current: (Supply voltage: 9V Brightness: 4 full brightness).Six common anode digital display, the highest six-digit display.RF IN (Signal Input Signal input): HX2.54-2P side port outlet ICSP (programming interface Programming interface): HX2.54-6P side port pin DC IN (Power Interface Power Interface): HX2.54-2P side port outlet.Dimensions: Approx. 91*28*20mm/ 3.58x1.10x0.79inch Package Includes: Three PACKAGE according to your order 1piece Red/1piece Blue/1piece Red or green random delivery Signal Frequency Counter (2 Pack)