How to adjust the week of Polaris perpetual calendar

The electronic clock with perpetual calendar is also called digital perpetual calendar, and its regulator has four keys, D, C, B and A correspond to each other: exit, run (down), up and set. The time adjustment method is as follows:

First press the "A" key (enter the time setting state, the year flashes), and you can press the "B" or "C (Down)" key to modify the year. After modification, press the "A" key to switch the flashing to the Gregorian calendar month, and press the "B" or "C (Down)" key to modify the month.

Day, hour, minute and second can be set in the same way; Week, lunar month and day will change automatically with the change of Gregorian calendar. Press the "A" or "D" key to exit the time setting and return to the normal time state.

Description of electronic clock function:

Clock function of electronic clock: it has 24-hour (hour) or 12-hour (hour) optional timing mode, displaying hours, minutes and seconds; It has the function of quickly calibrating hours, minutes and seconds; You can set the alarm time, which is 1 minute. If it exceeds 1 min, it will stop automatically.

With the function of manually stopping the alarm, it will not be operated again after stopping the alarm, and the alarm will not happen again; It has the function of telling time. With the progress and development of science and technology, some electronic clocks also have projection function, and at the same time, they are derived as auxiliary functions of many other products.

Working principle of electronic clock:

Electronic clock is a timing device, which displays "hours", "minutes" and "seconds" in human visual organs. Its timing cycle is 24 hours, and the full scale is displayed at 23: 59: 59. It has the functions of correcting time and telling time.

Therefore, a basic digital clock circuit is mainly composed of decoding display, "hour", "minute" and "second" counters, time correction circuit, time telling circuit and oscillator. The main circuit system consists of a second signal generator, a "hour, minute and second" counter, a decoder and a display, a time correction circuit and a time telling circuit.

The second signal generator is the time base signal of the whole system, which directly determines the accuracy of the timing system. It is generally realized by quartz crystal oscillator and frequency divider. The standard second signal is sent to the "second counter", which uses a hexadecimal counter to send a "minute pulse" signal every 60 seconds, which will be used as the clock pulse of the "minute counter".

Minute counter also uses hexadecimal counter. Every 60 minutes, it will send out a "time pulse" signal, which will be sent to the "time counter". The "hour counter" adopts a 24-bit decimal timer, which can realize the accumulation of 24 hours a day. The decoding display circuit decodes the output states of the "hour", "minute" and "second" counters with a seven-segment display decoder and displays them with a seven-segment display.

When the circuit strikes the hour, it generates a pulse signal according to the output state of the timing system, and then triggers the audio generator to strike the hour. The time calibration circuit is used to proofread and adjust the displayed numbers of "hours", "minutes" and "seconds".