User manual

Acquisition
Timebase
Timebase (Horizontal) settings control traces along the X axis. The timebase is shared by all channels.
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 is done on the Timebase dialog, accessed either by
choosing Timebase > Horizontal Setup from the menu bar or by touching the Timebase descriptor box.
Timebase Set Up
Use the Timebase dialog to select the sampling mode, memory /sample rate, and number of active
channels. You can also use it instead of the Front Panel to modify the Time/Div and horizontal Delay.
There are related dialogs for Reference Clock.
Sampling Mode
The Sampling Mode determines how the instrument samples the input signal and renders it for display.
See Sampling Modes for a description of each type.
Note: RIS and Roll modes are not available when using any other type of digital interleaving.
Timebase Mode
Time/Division is 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. The overall
length of the acquisition record is equal to 10 times the Time/Division setting.
Delay is the amount of time relative to the trigger event to display on the grid. Raising/lowering the Delay
value has the effect of shifting the trace to the right/left. This allows you to isolate and display a
time/event of interest that occurs before or after the trigger event.
l Pre-trigger Delay, entered as a negative value, displays the acquisition time prior to the trigger event,
which occurs at time 0 when in Real Time sampling mode. Pre-trigger Delay can be set up to the
instrument's maximum sample record length; how much actual time this represents depends on the
timebase. At maximum pre-trigger Delay, the trigger point is off the grid (indicated by the arrow at the
lower right corner), and everything you see represents 10 divisions of pre-trigger time.
l Post-trigger Delay, entered as a positive value, displays time following the trigger event. Post-trigger
Delay can cover a much greater lapse of acquisition time than pre-trigger Delay, up to the equivalent
of 10,000 divisions after the trigger event (it is limited at slower time/div settings and in Roll mode).
At maximum post-trigger Delay, the trigger point is off the grid far left of the time displayed.
Set to Zero returns Delay to zero.
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