5-11
IM 701510-01E
Setting the V
ertical and Horizontal
Axes
5
Relationship between sampling rate and record length
Reducing the time-per-division setting (“T/div” time axis setting) increases the sampling
rate. If T/div is set below some specific level, the displayed record length will be shorter
than the maximum displayable record length. For details, refer to Appendix 2/Appendix 3.
Changing T/div while acquisition is in progress
T/div can still be changed when acquisition has been stopped with the START/STOP key.
The newly set T/div will come into effect when acquisition is restarted. When T/div is
changed while acquisition is in progress, the new T/div value will be displayed below the T/
div for the displayed waveform, as shown below.
T/div for the currently displayed waveform
T/div just after acquisition has started
Points to note
• T/div can be changed irrespective of the displayed menu, since a T/div setting knob is
available. But, for DL1520L/DL1540L, note that it is not possible to select a short time
axis (50ns/div or less) if maximum displayable record length has been set to 400 KW, 1
MW, or 2 MW (for DL1540L only). (See page 7-1.)
• The T/div setting has no effect if the external clock signal is selected as the timebase.
• During expansion mode, the T/div obtained by dividing the normal display T/div by the
expansion ratio is displayed.
• If T/div is set so that roll mode is activated, averaging will not be performed on the
waveform data, even if the acquisition mode has been set to averaging mode (“NORM”
will be displayed instead of “AVG”).
• Even if the trigger mode is single mode, if T/div is set to a value within a certain range,
roll mode will still be activated. However, when a trigger is activated and acquisition of
data of the specified record length ends, waveform display will be stopped.
• Pressing the CLEAR TRACE key while waveforms are displayed in repetitive sampling
mode will restart sampling.
5.8 Setting the Time Axis
