GW Instek GDS-800 Series - Horizontal Controls and Display Modes

GDS-800 Series Digital Storage Oscilloscope Operation Manual
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(1): Cursors measure frequency of input waveform.
(2): The spectrum of channel one input waveform.
(3): Cursors measure magnitude of input waveform.
(4): the readouts for both horizontal and vertical cursors.
Figure 5-4: Operating the math function (FFT) with cursors measurement