Agilent Technologies InfiniiVision 5000 Series Guida Utente Pagina 62

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62 5000 Series Oscilloscope User’s Guide
2 Front-Panel Controls
2 Press the channel’s on/off key, then press the Coupling softkey
to select the input channel coupling.
Coupling changes the channel's input coupling to either AC
(alternating current) or DC (direct current). AC coupling
places a 3.5 Hz high-pass filter in series with the input
waveform that removes any DC offset voltage from the
waveform. When AC is selected, “AC” is illuminated on the
front panel next to the channel position knob ( ).
DC coupling is useful for viewing waveforms as low as 0 Hz
that do not have large DC offsets.
AC coupling is useful for viewing waveforms with large DC
offsets. When AC coupling is chosen, you cannot select
50 mode. This is done to prevent damage to the
oscilloscope.
Note that Channel Coupling is independent of Trigger Coupling.
To change Trigger coupling see page 94.
3 Press the Imped (impedance) softkey.
Measurement Hints
If the channel is DC coupled, you can quickly measure the DC component of the
signal by simply noting its distance from the ground symbol.
If the channel is AC coupled, the DC component of the signal is removed, allowing
you to use greater sensitivity to display the AC component of the signal.
NOTE
When you connect an AutoProbe, self-sensing probe, or a compatible
InfiniiMax probe, the oscilloscope will automatically configure the
oscilloscope to the correct impedance.
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