Spectrum analyser with several input signal measuring channels

摘要

The spectrum analyser has at least two measuring channels (CH1,CH2). Each channel contains a frequency mixer (11,12), an auxiliary oscillator (21,22) and an IF (intermediate frequency) filter (31,32), for mixing an input signal to be measured with an auxiliary oscillator signal to provide an IF signal fed through the filter. One of the measuring channels contains a demodulator (70) for demodulation of the IF signal (100) and provision of a trigger signal, which initiates the operation of the other measuring channel.