Meters -Frequency Measurement Highlights Generic Brand Frequency Measurement Description: LED 1Hz-50MHz Crystal Oscillator Frequency Tester Digital Counter ~1Hz 50MHz frequency Five digit resolution (eg display X. xxxx xxxx kHz X. MHz or xx. MHz xxx) measurement signal amplitude up to 30 V 4-40 Meters can measure passive crystals auto-ranging with different grid times Optional addition or subtraction of frequency offset ( programmable) Low component count: a PIC 16F628, 5 segment LED displays, a 20 MHz crystal and some resistors Optional (configurable) power saving mode that does not automatically change the display off when the frequency substantially within 15 seconds 5V USB or DC5-12V power supply can be used Specification: Soldering installation considerations, these steps: Components are soldered on the back of the board (including good side of microcontroller resistance capacitance printing at the screen), bottom to top, the first principle, namely weak welding components, such as crystal, capacitor, resistor, diode. The microcontroller header soldering, then soldering, triode, button, a power socket. The back with a knife next to short the pins as much as possible debugging steps: After the completion of the PIC16F628 microcontroller IC soldering, note the direction of the IC, the insert may damage the chip! Check the IC or counter, these anti- take timely correction. After the check, the electricity, the fourth digital tube display 0. said the installation was successful! Using the step of: Before measurement signal, please change J1 jumper. blue terminals for the IN for signal input, GND GND for signal input signal amplitude does not exceed 30V, otherwise the frequency meter damage. Before measuring the crystal please switch the J1 jumper plug to JP1 insert 4m to 40m from the crystals can measure crystal frequency Note: This is unassembled DIY Kits Package includes: 1 Piece Frequency Counter DIY kit