GDS-800 Series Digital Storage Oscilloscope Operation Manual
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CH1, CH2: The vertical menu contains the following items when channel 1 or
channel 2 is the selected. These two pushbuttons are also switching the waveform
display of channel 1/channel 2 on or off. If channel one (or channel 2) turned off, the
light of CH1 (or CH2) LED button will be off, and vice versa.
z Coupling / / : Press F1 softkey to select AC ( ),
DC ( ) coupling, or ground ( ).
z Invert On/Off: Press F2 softkey to select to turn (waveform) invert on or off
z Bw Limit On/Off: Press F3 softkey to switch between 20MHz or full bandwidth.
z Probe 1/10/100: Press F4 softkey to select the probe’s ×1, ×10, or ×100
attenuation.
z Impedance 1MΩ: Input impedance display. Always 1MΩ input impedance for
GDS-800 series digital storage oscilloscope.
MATH: Select a formula from the math menu: CH1+CH2, CH1-CH2 or FFT (Fast
Fourier Transform). You can convert a time-domain signal into its frequency
components by our advanced FFT math function. The Math menu contains the
following items by pressing F1 softkey after math function is selected. The display of
mathematical waveform can be disabled by pressing MATH pushbutton again.
z CH1+CH2: Waveform of channel 1 plus waveform of channel 2.
Figure 5-3: Operating the math function (Channel + channel 2)
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