Mini chip's 8-bit microcontroller PIC16F648A serves as the core of the high-performance 1.2GHz frequency meter. Built-in frequency reference using temperature compensated voltage-controlled crystal oscillator (2.5 ppm - TCXO). Dual IF design allows IF and add/subtract mode to be individually preset. LCD0802 LCD screen displays up to 7 digits with leading zero automatic blanking for invalid frequency values. Anti-reverse power polarity design supports low-power battery operation. Dual-button control provides a user-friendly interface. Settings are automatically saved and recalled on startup. Gate time: 0.64 sec Measuring range: 1 MHz to 1.2 GHz Measurement accuracy: 100 Hz Channel sensitivity (based on HM8134-2 data): Test Frequency (MHz): 5, 10, 30, 60, 100, 150, 200, 300, 450 Sensitivity (mV RMS): 35, 20, 10, 3, 3, 4, 8, 15, 12 Test Frequency (MHz): 500, 550, 600, 700, 800, 900, 1000, 1100, 1200 Sensitivity (mV RMS): 14, 30, 65, 80, 80, 35, 175, 270, 310 Operating voltage: DC input 9V - 12V (with reverse polarity protection) Operating current: ≤55 mA with backlight enabled Display digits: Up to 8 digits IF settings: Adjustable in 100 Hz steps from 0 to 999.9999 MHz;可 set to increase or decrease IF mode. Frequency reference: 13000-MHz temperature-compensated voltage-controlled crystal oscillator (-TCXO) in 5032 package with 2.5 ppm stability. RF INPUT (measurement signal input): XH2.54-2P square socket ICSP INPUT (MCU programming interface): XH2.54-6P pin header POWER INPUT: XH2.54-2P square port socket Name: Frequency Meter Color: As shown Material: PCB + Plastic + Metal Package Contents: 1 x PLJ-0802-E frequency counter meter with cable Note: Light reflection and display differences may cause slight color variation between image and actual item. Measurement error allowance is ±1-3 cm.