Timebase, Timebase settings – Teledyne LeCroy HDO 4000 Operators Manual User Manual
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HDO4000 High Definition Oscilloscope
Timebase
Timebase, also known as Horizontal, settings control the trace along the X axis. These settings are
shared by all channel traces.
The time represented by each horizontal division of the grid, or Time/Division, is most easily adjusted
using the Front Panel Horizontal knob. Full Timebase set up, including sampling mode selection, is done
on the Timebase dialog, which can be accessed by either choosing Timebase > Horizontal Setup from the
menu bar, or touching the Timebase descriptor box.
The main Timebase dialog contains settings for Sampling Mode, Timebase Mode, and Real Time
Memory. Related tabs open dialogs to set up Sequence Mode and Reference Clock.
Timebase Settings
Sampling Mode
,
, or
mode.
Timebase Mode
These controls set the timebase shared by all channels.
Time/Division - the time represented by one horizontal division of the grid. Touch the Up/Down Arrow
buttons on the Timebase dialog or turn the Front Panel Horizontal knob to adjust this value.
Delay - The time relative to the trigger event to display on the grid. In
, the
trigger event is placed at time zero on the grid. Delay may be time pre-trigger, entered as a negative
value, or post-trigger, entered as a positive value. Raising/lowering the Delay value has the effect of
shifting the trace to the right/left, enabling you to focus on the relevant portion of longer acquisitions.
Set to Zero - returns Delay to zero.
Real Time Memory
Max. Sample Points - the maximum number of samples taken per acquisition. The actual number of
samples acquired can be lower due to the current Sample Rate and Time/Division settings.
Active Channels
These settings enable you to control the distribution of memory to achieve longer acquisitions through a
single channel if needed.
4 (or 2 in 2 channel scopes) - the per channel maximum memory is available (12.5 Mpts/ch standard, 25
Mpts/ch with the –L memory option).
2 (or 1 in 2 channel scopes) - the total maximum memory is available (25 Mpts or 50 Mpts with the –L
memory option), but only half the channels can be used. Channels 2 and 3 (in 4 channel scopes) and
Channel 2 (in 2 channel scopes) are available for use.
Auto - allows the scope to make this decision based on which channels are currently in use.
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