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Hi Res mode requires twice the acquisition memory of other acquisition modes. When you select
Hi Res mode, the instrument sets the record length accordingly to keep it from running out of
memory.
Record lengths of less than 500 samples are not supported except in FastFrame, where Frame
Length can be set as low as 50 samples.
When you change the record length, you can choose to hold either the sample rate or the
horizontal scale constant. The remaining variables will change in response to the record length
changes. See User Preferences: Record Length on page 222 to make this choice.
Horizontal Scale
To Use
Click the Scale control to map it to one of the multipurpose knobs and
use the knob to change the value. You can also use the
increment/decrement buttons beneath the control or the pop-up
keypad.
Behavior
Use the Scale control to adjust the time base. This control scales all live displayed waveforms
(both channel and math waveforms). You can use the Horizontal Zoom control window to change
the horizontal scale and position of reference waveforms within the Zoom window(s).
When the horizontal delay is off, the scale expands or contracts around the trigger point. When the
horizontal delay is on, the scale expands or contracts around the horizontal reference point.
The scale units depend on the waveform type. In most cases the horizontal units will be time, but
they can also be frequency.
Use the dedicated front-panel HORIZONTAL SCALE knob to change the horizontal scale.
Horizontal Control Window Readouts
To Use
You cannot change the readouts of the Horizontal controls directly. The
readout values are determined by other Horizontal control settings.
Behavior
Use the horizontal readouts to obtain a quick overview of the horizontal
settings.
Resolution is similar to the acquisition interval. It can be thought of as the
time between sample points. In most cases, the acquisition interval is the
same as the resolution.
Sample Rate is the number of acquisition samples per second. The faster the
sample rate, the more accurately the instrument can represent fine details in
a fast signal.
Duration specifies the time across the 10-division screen.
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