Function: PLJ-8LED is a cost-effective frequency display component displayed by an eight-digit digital tube. It is mainly used to display the frequency value of transceivers and other equipment, and can also be used for routine frequency measurement. This component has the characteristics of small and exquisite, reliable performance, good visual effect and low cost. Main feature: 2.4 GHz frequency meter with PIC16F648A as the core. The frequency reference adopts temperature-compensated voltage-controlled crystal oscillator (2.5 ppm VC-TCXO). Using unique gate control mode and precise time algorithm (non-timed interrupt mode). The gate (display refresh) time is 0.01 second/0.1 second/1.0 second optional, and the frequency value is displayed in real time. Single-ended input design, three channels of frequency measurement (low channel/high channel/auto channel) are optional. Dual intermediate frequency design, intermediate frequency value and plus/minus mode can be preset separately. Using an eight-digit 0.56 inch high-brightness digital tube display, eight-level brightness is adjustable. Invalid zero automatic blanking, invalid frequency value display filtering is optional, the last bit blanking is optional. Simple circuit, reasonable structure, double button control, simple operation. Various settings are automatically saved and directly recalled after power on. Technical Parameters: 1. Gate time 0.01 second 0.10 seconds 1.0 second 2. Measurement channel (high and low channels are high impedance) Low channel Measuring range: 0.1 MHz ~ 60 MHz Measurement accuracy: 100Hz (at 0.01 second gate) 10Hz (at 0.1 second gate) 1Hz (at 1.0 second gate) Low channel sensitivity: 0.1 MHz ~ 10 MHz: better than 60mVPP 10 MHz ~ 60 MHz: better than 60mVPP 60 MHz ~ 75 MHz: not tested High channel (64 frequency division) Measurement range: 20 MHz~2.4 GHz Measurement accuracy: 6400Hz (when the gate is 0.01 seconds) 640Hz (at 0.1 second gate) 64Hz (at 1.0 second gate) High channel sensitivity: 20 MHz ~ 30 MHz: better than 100mVPP 30 MHz ~ 60 MHz: better than 50mVPP 60 MHz ~ 2.4GHz: not tested Automatic channel The high channel or low channel is automatically selected according to the input signal frequency, and the identification frequency is 60 MHz. If the input signal amplitude greater than 60 MHz is insufficient and the high channel cannot be automatically selected, the high channel frequency measurement should be selected manually. 3. IF setting Independent dual intermediate frequency design, the minimum step of intermediate frequency adjustment is 100 Hz, the intermediate frequency range is 0 ~ 99.9999 MHz, and the mode of adding intermediate frequency or subtracting intermediate frequency can be set. 4. Frequency reference Using a 5032 package 13.000MHz temperature-compensated voltage-controlled crystal oscillator (VC-TCXO), the frequency stability is 2.5 ppm. 5. Working voltage DC input: DC 9V~15V (with power supply polarity reverse protection) 6. Working current Maximum 160 mA (test conditions: DC12V power supply; red digital tube; eight levels of brightness) 7. Display digits Eight-digit LED display, the highest display eight digits. 8. Display brightness Eight-level LED brightness is adjustable, and the factory setting is the highest brightness. 9. Physical dimensions Length width height: 125.5 mm 25.5 mm 21.5 mm 10. Component quality 46 g (net weight) 11. Onboard interface DC IN (power interface): HX2.54-2P socket RF IN (signal input): HX2.54-2P socket ICSP (programming interface): 2.54-6P pin Package List: 1PC NEW PLJ-8LED-R 0.1MHZ - 2.4GHz RF Signal Frequency Counter Cymometer Tester