1.Frequency sweep instrument (frequency characteristic tester, referred to as frequency sweep instrument) is a special instrument that can directly display the frequency characteristics of the circuit under test on the oscilloscope screen, that is, it is an instrument that combines the frequency sweep signal generator, frequency mark signal generator and oscilloscope. It can intuitively see the frequency characteristic curve of the circuit under test, which is convenient to adjust the circuit components when the circuit is working, so that its working frequency meets the specified technical requirements. It can be used to test and adjust the frequency characteristics of the active and passive four-terminal networks in this frequency band. For example: television receiver, wide band amplifier, radar receiver intermediate frequency amplifier, high frequency amplifier and frequency discriminator, filter and other electronic equipment. It is widely used in electronic, communication and communication laboratories in universities.

2.The sweep meter is generally composed of scanning sawtooth wave generator, sweep signal generator, broadband amplifier, frequency signal generator, X axis amplification, Y axis amplification, display equipment, panel keyboard and multiple output power supply.