SPECIFICATIONS

Application: Computer

Brand Name: Megmoki

Choice: yes

Condition: New

Dissipation Power: Crystal Oscillator tester meter

Model Number: tester meter

Operating Temperature: Digital LED tester meter

Origin: Mainland China

Package: DIP

Supply Voltage: 5v

Type: Voltage Regulator

is_customized: Yes

semi_Choice: yes

This is a frequency meter based on PIC microcontroller, with crystal vibration measurement function and programmable frequency setting, five-digit digital tube display, convenient and intuitive, all use directly inserted components, circuit is simple, easy to make.

Circuit features:

Measurable frequency range 1Hz-50 MHZ (1 HZ-50 MHZ);

The oscillation frequency of most common crystal vibration can be measured.

Five-digit precision resolution (e.g. 0.0050 KHZ, 4.5765 MHZ, 11.059 MHZ);

Automatic range conversion without manual switching;

Programmable plus or minus frequency setting for measuring equipment such as radio transceivers;

You can choose the power-saving mode. If there is no significant change in frequency within 15 seconds, the display will automatically turn off.

It can be powered by a universal USB 5V interface, or an external DC power supply or a 9V battery.

Small number of components, all directly inserted components, easy installation and debugging.

PCB size: 80*53 mm

Weight of single set: 0.034kg

Crystal vibration measurement (4M, 16M crystal vibration) :

Crystal vibration measurement (20M, 11.0592M) :

The crystal oscillator of 32.768khz cannot be measured. The crystal oscillator of 4-20mhz and 48MHZ can also be measured due to limited conditions. However, since this kind of crystal oscillator USES a 3 times harmonic wave, the crystal oscillator of 48MHZ will display the fundamental wave frequency of 16MHZ, as shown in the figure below:

It is also possible to directly input frequency signals between IN and G (ground) for measurement, taking care that the measured signal amplitude is not higher than 5V to avoid damaging IC. The following figure shows the input of 1HZ and 10KHZ:

All the directly inserted components can be welded correctly according to PCB silk screen printing. After the welding, input signal with standard signal source and adjust the yellow adjustable capacitance to make the display value equal to the signal frequency. The signal generator can be used for adjustment. If there is no standard signal, the crystal vibration can be used for direct calibration with better accuracy.

The power supply can be transferred from USB to 3.5mm power cord or directly into 5-9V DC power supply at - and + pads