Time and frequency measuring instruments can be divided into two main categories: time frequency generator and time frequency meter. The former generates frequency, time interval or time signal, and the latter is used to measure frequency and time interval. This article briefly introduces the commonly used measuring standard instruments, the scope of measurement and the characteristics of products.

Frequency synthesizer, also called signal generator, has a frequency range from 1US to 110GHz. The frequency synthesizer also includes the GNSS signal simulator.

The signal generator recommends SYN5651 type equipment. The main function is to provide the test signals needed for the circuit to be tested. The output signal frequency can usually be selected according to the decimal digit, which can reach up to 11 digit high resolution. The signal is based on the high stability quartz oscillator as the standard frequency source, and the frequency synthesis technology is used to form any desired frequency signal, which has the same frequency accuracy and stability as the standard frequency source.

The time synthesizer is to generate various time intervals, all of which are pulses. A time interval is given with positive (negative) pulse interval or positive (negative) pulse width.

The standard time interval generator recommends the SYN5612 type, adopts the direct digital synthesis technology, selects the high precision constant temperature crystal oscillator as the internal clock reference, carries on the counting to trigger or the single trigger output to the signal, has many output channels and the external trigger input channel, the external frequency sign input channel, the many pulse signal outputs, uses the large-scale integrated circuit FPGA technology, the full digital control, the reality. High precision pulse generation test.

Frequency counter is a high performance price ratio time and frequency measuring instrument that can accurately measure signal frequency. The frequency measurement ranges from 1uhz to 110GHZ. The SYN5637 type high precision frequency counter can measure the average, maximum, minimum, peak and other parameters.

The time difference measurement can measure the time interval and pulse width between the two pulses, ranging from 1ns to 104s. The SYN5605 type multi-channel time interval meter is a high performance price difference precision time difference measuring instrument, which has perfect functions and strong anti-interference ability.

The GNSS receiver can be used for time measurement. The receiver can receive one or more GNSS signals and generate standard 1PPS signals. SYN2306C GPS and Beidou dual-mode receiver generate serial port time information and 1PPS second pulse synchronization signal, and can directly output NEMA data without external CPU.

The reference frequency standard is a high precision frequency standard equipment. The frequency stability should be 3 times the stability of the checked frequency. Other technical indicators such as the aging rate and the frequency accuracy should be better than the corresponding technical indicators.

SYN3204 GPS tame rubidium atomic frequency standard, receive GPS signal, output 5MHz, 10MHz and other frequency signals. The output frequency of the rubidium oscillator is synchronized to the GPS cesium atomic clock signal, which improves the long-term stability and accuracy of the frequency signal, and can provide the high precision time frequency standard of the cesium clock magnitude.

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