If the first harmonic of a clock signal can be represented by a sine wave, if the moment changes, the original regular sinusoidal signal will appear inflection point in the course of the change, then the spectrum will follow the corresponding change, but it will be more complicated spectrum composed of many lines distributed around the clock frequency. The spectrum line near the spectrum waveform is the phase noise spectrum. The noise caused by the change of initial phase is called phase noise. Therefore, for a primary harmonic of a sine clock signal or a clock signal, it should be zero in theory. At this time, a phase noise tester is needed to measure the corresponding phase noise.

We should pay attention to the following points when choosing a suitable phase noise tester with high cost performance.

1, hardware structure:

1.1 the phase noise tester of our company adopts advanced phase measurement technology. The hardware structure uses 9 Inch Touch screen, 4 core processor, 4G memory, 4G display, 60G solid state drive and industrial keyboard, etc. the switchgear only takes about ten seconds.

1.2, a household is composed of a single chip microcomputer. It is composed of simple hardware, and there is no technical guarantee for testing.

2. Measuring range

2.1 our phase noise tester can measure phase noise and stability of 500kHz-30MHz equal width frequency simultaneously, covering almost all commonly used frequency sources.

2.2 it is not practical for a company to measure a narrow frequency band.

3, use method

3.1 our company's phase noise tester implements graphical user interface. Industrial keyboard and touchscreen can be used at the same time. The operation is simple. Just press the start to test in seconds. Without skilled engineers, you can easily learn and use.

3.2 when using a phase noise tester, a few skilled technicians are required to cooperate with each other.

4. Result processing

4.1 the phase noise tester of our company does not need additional data processing, that is, Allen variance calculation and other software programs can directly display the results, convenient, fast and accurate.

4.2 when a phase noise tester is working with a product, a professional technician is required to calculate the result through the corresponding software. The whole process is rather cumbersome.

5, company size

5.1 the size of our company: our company covers an area of nearly 1000 square meters, and the number of its incumbency is nearly 50, of which 3 are research institutes and 15 are undergraduates.

5.2 a certain scale: it covers an area of tens of square meters (rents), with a total number of no more than 10 people.

6. Company's production and testing capability

6.1 our company has artificial intelligence automatic placement machine, wave crest reflow soldering machine, forming an automatic standard production line, so that we can mass production and processing products, improve efficiency and reduce the problem of false welding and leakage welding due to manual welding.

The test also includes: constant temperature and humidity test box, vibration impact stage, cesium atomic frequency standard. Cesium atomic frequency standard is higher than that of rubidium atomic frequency standard. According to professional metrology, the equipment can only be calibrated / calibrated by a higher level equipment.Therefore, it is necessary to produce a set of cesium atomic frequency standard when producing rubidium atomic frequency standard source.

6.2 a certain production capacity: the whole manual welding, low efficiency and high failure rate, without any professional testing equipment.

7, after-sale warranty

7.1 our company is located in Xi'an high tech Zone of Shaanxi Province, providing perfect technical support and after-sales service. Our company provides one free 12 months warranty period. The quality guarantee period starts from the date of delivery of the equipment. During the period of product quality assurance, a complete free warranty service is provided by repairing the whole machine, sending parts and providing spare parts, etc., due to the malfunction caused by the quality of the product itself.

7.2 a company that has no production capacity can only act as an agent for foreign products, but the quality and after-sale are not well protected.

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