With Microchip's PIC16F648A, 2.4 GHz frequency meter. Using temperature-compensated voltage controlled crystal oscillator (2.5 ppm VC-TCXO). Unique gate control and precise time algorithm (non-timed interrupt). Gate (display refresh) time 0.01 seconds / 0.1 seconds / 1.0 seconds, real-time display frequency value. Single-ended input design, three-channel frequency measurement (low channel / high channel / Auto Channel). Dual frequency design, value and IF / down mode can be preset separately. Using eight 0.56 inches high brightne digital display, eight adjustable brightne. Circuit is simple and reasonable structure, two-button control, simple operation. The settings are automatically saved, boot directly call. s: 1 Gate time 0.01 seond 0.10 second 1.0 second 2 Measurement channels (channels are low impedance) low channel Measuring range: 0.1 MHz ~ 60 MHz Accuracy: 100Hz (0.01 1s gate time) 10Hz (0.1 seconds gate) 1Hz (1.0 seconds when the 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 (divided by 64) Measuring range: 20 MHz ~ 2.4 GHz Accuracy: 6400Hz (0.01 seconds gate) 640Hz (0.1 1s gate time) 64Hz (1.0 1s gate time) High channel sensitivity: 20 MHz ~ 30 MHz: better than 100mVPP 30 MHz ~ 60 MHz: better than 50mVPP 60 MHz ~ 2.4GHz: not tested Auto Channel Automatically selected according to the input signal frequency high or low channel channel, identifying the frequency of 60 MHz. Such as when the input signal amplitude is greater than 60 MHz shortage can not automatically select high channel, the channel should manually select high frequency measurement. 3,IF settings Independent double-IF design, adjust the minimum frequency step of 100 Hz, frequency range 0 ~ 99.9999 MHz, can be set to increase or decrease the IF frequency mode. 4. Frequency reference Using 5032 package 13.000MHz Warming voltage controlled crystal oscillator (VC-TCXO), frequency stability of 2.5 ppm. 5. Operating voltage DC Input: DC 9V ~ 15V (with reverse polarity protection) 6 Current Maximum 160 mA (test conditions: DC12V power supply; red LED; eight brightne) 7 Eight LED display, the highest display eight digits. 8 Eight LED brightne is adjustable, factory set to maximum brightne. 9 Physical Dimensions,Length width height: 125.5 mm 25.5 mm 21.5 mm 10. Component quality 46 g (NW) 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 included : 1 x 0.1-60MHz 20MHz ~ 2.4GHz RF Singal Frequency Counter Cymometer Tester Meter with shell 2 X wire