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HDO9000 High Definition Oscilloscopes Operator's Manual
Single sets Single trigger mode. The first press readies the oscilloscope to trigger. The second press
arms and triggers the oscilloscope once (single-shot acquisition) when the input signal meets the
trigger conditions.
Stop prevents the scope from triggering on a signal. If you boot up the instrument with the trigger in
Stop mode, a "No trace available" message is shown. Press the Auto button to display a trace.
Horizontal Controls
Turn the Delay knob to change the Trigger Delay value (S). Push the knob to reset Delay to zero.
If the trace source is an input channel, turn the Horizontal Adjust knob to set the Time/division (S) of
the oscilloscope acquisition system. The value is shown on the Timebase descriptor box. When using
this control, the oscilloscope allocates memory as needed to maintain the highest sample rate
possible for the timebase setting. If the trace source is a zoom, memory or math function, turn the
knob to change the horizontal scale of the trace, effectively "zooming" in or out. The value is shown
on the corresponding descriptor box. Push the knob to change the setting in fine increments; push it
again to return to 1, 2, 5, 10-step increments.
Vertical Controls
The front panel Channel buttons (1-4) turn on a channel that is off, or activate a channel that is
already on. When the channel is active, pushing its channel button turns it off. A lit button shows the
active channel (in this image, C1 is lit).
Offset knob adjusts the zero level of the trace (this makes it appear to move up or down relative to
the center axis of the grid). The value appears on the trace descriptor box. Push it to reset Offset to
zero.
Gain knob sets Vertical Gain (V/div). The value appears on the trace descriptor box. Push it once to
adjust V/div in fine increments; push it again to adjust in 1, 2, 5, 10-step increments.
Dig button enables digital input on -MS models.
Math, Zoom, and Mem Buttons
The front panel Zoom button creates a quick zoom of each open channel trace. The resulting zoom
traces are 1/10 of the channel timebase and centered on the display. Touch the zoom trace
descriptor box to display the zoom controls and adjust this. Touch the Zoom button again to turn off
the zooms.
The Math and Mem(ory) buttons open the corresponding setup dialogs.
Cursor Controls
Cursors identify specific voltage and time values on the waveform. The white cursor markers help
make these points more visible, as well as provide a simple way to reposition them. A readout of the
values appears on the trace descriptor box.
There are five preset cursor types, each with a unique appearance on the display. These are
described in more detail in the
Cursors
section.
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