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Seok Jin Wong
Using a digital multimeter (DMM) to perform measurements is very common in today’s world. Technicians uses multimeters for equipment servicing, engineers use multimeters to troubleshoot, students use multimeters for lab research, and so on. Since digital multimeters have many functions, you need to know how to properly use your multimeter.

Hi every one.The spectrum analyzer in VNA is a nice function,but it still has some problem.It has a probability to record image signal.The patent said:With an unknown muilt-tone input RF spectrum,the chance of recording an image signal at any RF frequency for a multi-tone input RF spectrum  of some arbitrary period is approximately