HDO6000 High Definition Oscilloscope
External Reference Clock vs. External Sample Clock
An external reference clock is used to synchronize the oscilloscope's internal timebase to an external
frequency source. This allows multiple instruments to lock their timebases to a common source.
An external sampling clock, applied via the Ext input, replaces the oscilloscope's internal timebase as the
sampling clock. This means that the external sampling clock controls when the oscilloscope's digitizers
sample the input waveforms.
Since the external sampling clock uses the Ext input, an external trigger cannot be used when the external
sampling clock is in use.
Auto Setup
Auto Setup quickly configures the essential oscilloscope settings based on the first input signal it finds,
starting with Channel 1. If nothing is connected to Channel 1, it searches Channel 2 and so forth until it
finds a signal.
Vertical Scale (V/div), Offset, Timebase (Time/div), and Trigger are set so that there is an Edge trigger on
the first, non-zero-level amplitude, and the entire waveform is visible for at least 10 cycles over the 10
horizontal divisions.
To run Auto Setup, you can either:
l Press the Auto Setup Front Panel button.
l Choose Auto Setup from the Vertical, Timebase, or Trigger menus. All these options perform the
same Auto Setup function.
To confirm Auto Setup, press the Auto Setup button again or use the touch screen display.
Restore Default Setup
Restore the oscilloscope to its factory default state by pressing the Front Panel Default Setup button. You
can also restore default settings by choosing File > Recall Setup > Recall Default.
Default settings for your oscilloscope include the following:
Channel/Vertical C1-C4 on at 50 mV/div Scale, 0 V Offset, Linear Interpolation
Timebase Real Time Sampling at 50 ns/div, 0 Delay, 1.25 kS at 2.5 GS/s, 1.0 MS Memory
Trigger C1 with an Auto Positive Edge, DC Coupling, 0 V Level
Display Auto Grid
Cursors Off
Measurements Cleared
Math Cleared
40
922499 Rev B
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