Signaalijälgur koosneb tavaliselt võimendist ja valjuhääldist, mis on sageli patareitoitel ja pakitud väikesesse käeshoitavasse katsesondi, ning valikuliselt kasutab lisaks ka diooddetektorit, mis võimaldab tuvastada amplituudmoduleeritud signaale.
Usually a very simple device, a signal tracer normally provides an amplifier, and a loudspeaker, often battery-powered and packaged into a small, hand-held test probe, and an optional diode detector is usually also provided, allowing the detection of amplitude-modulated signals.
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