Stopwatch And Timer Calibration

Stopwatch and timer calibrations are perhaps the most common calibrations performed in the field of time and frequency metrology. Hundreds of laboratories and metrology institutes calibrate many thousands of timing devices annually to meet legal and organizational metrology requirements.

There are three generally accepted methods for calibrating a stopwatch or timer: the direct comparison method, the totalize method, and the time base method. The first two methods consist of time interval measurements that compare the time interval display of the DUT to a traceable time interval reference. In the case of the direct comparison method, the time interval reference is normally a signal broadcast, usually in the form of audio tones. In the case of the totalize method, the time interval reference is generated in the laboratory using a synthesized signal generator, a universal counter, and a traceable frequency standard. The third method, the time-based method, is a frequency measurement. It compares the frequency of the DUT's time-base oscillator to a traceable frequency standard.

Suin SF2002 stopwatch calibrator is an easy-operating and high-precision instrument that adapts the totalize method, which can calibrate electric stopwatches (405,407,408,415/417), mechanical stopwatches and digital quartz electronic stopwatches.

It can not only calibrate one stopwatch but also several ones with several fixtures, which meet different requirements, just like below pictures shown.

 

 

 

If you want to know more information about it, please contact us for its User's manual or operation video.

Basic Function Introduction - Frequency Measurement

Frequency measurement plays a very important role in the field of electronic engineering. Whether in communication systems, power systems or other fields, accurate measurement of the frequency of signals is essential. In communication systems, frequency measurements are used to ensure that the signals being sent and received are in the correct frequency range. For example, during modulation and demodulation, the frequency of a signal needs to be measured accurately to ensure that the information is transmitted correctly. In power systems, frequency measurements are critical to maintaining the stability of the power grid, where variations in frequency can lead to faults or instability in the power system.

The frequency range can be divided into three parts: low frequency: below 200Hz, medium frequency: 200Hz-6khz, and high frequency: above 6KHz. In the market, the most commonly used equipment for measuring frequency are oscilloscopes, spectrum analyzers, and frequency counters, of which oscilloscopes are relatively low in frequency measurement accuracy and have large errors. The spectrum analyzer can accurately measure the frequency and display the spectrum, but measurement speed is slow and cannot quickly track and capture the change of the measured signal frequency in real-time. The frequency meter can quickly and accurately capture the change in the frequency of the measured signal, and it has a wider range of applications.

Now, we take the Suin SS7300 frequency counter as an example to introduce its frequency measurement function:

SS7300 has three output channels, with 1 and 2 channels measuring up to 200MHz.

Set the frequency of the signal generator to 200MHz, select the frequency measurement function, and the measurement results are shown in Fig 1:

 

Fig 1. Frequency Measurement

 

Channel 3 can be equipped with channel options in a higher frequency range to meet customer needs, as shown in Fig 2, and can reach up to 40GHz.

 

Fig 2. Channel Options

If you have frequency measurement needs, welcome to consult.