Design requirements 1. Design a frequency meter that measures the frequency of the square wave signal. The measurement results are displayed in decimal numbers. 2. The measured frequency range is 1~10KHz, which is divided into two frequency bands, namely 1~999Hz, 1KHz~10KHz. The measurement frequency is displayed by three digital tubes, and the unit is indicated by LED display. If the green light indicates Hz, the red light indicates KHz. 4. With over-range alarm function, it emits light and sound signals when the measurement range of the current range is exceeded. Design tips The frequency of the pulse signal is the number of pulses generated in a unit time, the expression is f=N/T, f is the frequency of the signal under test, N is the number of pulses accumulated by the counter, and T is the number of pulses generated. The time required. Therefore, the result recorded by the counter within 1 second is the frequency of the signal being measured. Measurement/verification selection module Counter module Save selection alarm module Latch module Scan display module Measurement/verification selection module Input signal: select signal sete Measured signal meas Test signal test Output signal: CP1 When selet=0, it is the measurement state, CP1=meas; When selet=1, it is the check state, CP1=test. The calibration and measurement share a circuit, except that the measured signal CP1 is different. Set the 1 second timing signal (the period is 2 seconds), and all the measured signals in the 1 second timing time are sent to the counter input. The counter counts the CP1 signal. After the 1 second timer expires, the counter result is sent to the latch for latching, and the counter is cleared to prepare for the next sample measurement. Set the range control switch K, the unit display signal Y, when K=0, it is 1~999Hz range, the value displayed by the digital tube is the measured signal frequency value, Y is green, that is, the unit is Hz; When K=1, it is a 1KHz~10KHz range. The measured signal frequency value is the value displayed by the digital tube multiplied by 1000, and Y is displayed in red, that is, the unit is KHz. Set the warning signal alert to the range measurement range. The counter consists of a four-level decimal count (with carry C). If the measured signal frequency is less than 1KHz (K=0), the counter only performs three-level decimal counting, and the maximum display value is 999.Hz. If the measured signal frequency exceeds this range, the warning signal drives the light and the speaker alarm; The signal is 1KHz~10KHz (K=1), the counter performs four-digit decimal counting, and the upper three digits are displayed. The maximum display value is 9.99KHz. If the measured signal frequency exceeds this range, the alarm will be given. Bimetallic Clad Kitchenware Materials Non-Stick Coating: Bimetallic Clad Kitchenware Materials have a long-lasting non-stick coating for easy food release or throwing, clean and healthy cooking, and a heat-resistant paint finish on the exterior to make them heat-resistant Bimetallic Clad Kitchenware Materials,bimetallic clad kitchenware materials and equipment,bimetallic clad kitchenware materials best,bimetallic clad kitchenware materials group Changshu Herun Import & Export Co.,Ltd , https://www.herunchina.com
3. It has two functions of automatic checksum measurement, that is, it can check the measurement accuracy with standard clock. 
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