7-2
IM 701510-01E
Selecting sampling mode: Repetitive
A sampling mode can be selected provided that the selected T/div setting allows sampling
both in real-time and repetitive modes.
However, the repetitive sampling mode is not effective when the trigger mode is set to
single long mode. Furhermore, the repetitive sampling mode cannot be set in case of the
single (N) trigger mode, when the history memory function is used, or in case FFT is used.
T/div settings which enable the selection of the sampling mode are from 5
µ
s to 100 ns/div.
Selecting the (maximum displayable) record length, for DL1520L/DL1540L
You can set the maximum displayable record length to 1 KW, 10 KW, 100 KW, 400 KW, 1
MW, or 2 MW (for DL1540L only). The default selection is 10 KW. The following
restrictions apply.
• Time-axis settings from 50 ns to 5 ns cannot be used in combination with 400 KW, 1
MW, and 2 MW record lengths. If the time-axis value is already set within this range, the
400 KW, 1 MW, and 2 MW selections will not be available.
• If the selected record length is 400 KW or 2 MW, certain time-axis settings will produce
waveform display over eight divisions only, with no waveform appearing over the two
rightmost time-axis divisions.
• Selection of 400 KW, 1 MW, and 2 MW record lengths is available only if trigger mode
is “single.”
• For DL1540L, it is not possible to switch on Channel 3 or Channel 4 while record length
is set to 2 MW. It is not possible to select 2 MW as the record length while Channel 3 or
Channel 4 is on.
• For DL1520L, it is not possible to switch on Channel 2 or trace MATH while record
length is set to 1 MW. It is not possible to select 1 MW as the record length while
Channel 2 or trace MATH is on.
• Refer to Appendix 3 for information about the relationship between time axes, sampling
rates, and record lengths.
Points to note when making acquisition mode and sampling mode settings
• Normal mode operations are carried out, even if envelope mode has been selected.
• It is not possible to select envelope mode if waveforms are sampled by the external clock.
• If each single mode has been selected as the trigger mode or if the history memory
function has been set to ON, averaging mode cannot be selected.
• If auto-mode or auto-level mode has been selected as the trigger mode and T/div has been
set such that the display is in roll mode, averaging will not be performed, even if
averaging mode is selected. In this case, waveforms are displayed in roll mode.
• It is not possible to select envelope mode if input smoothing or FFT has been set to ON.
7.1 Selecting Acquisition Mode, Sampling Mode, and Record Length for DL1520L/DL1540L
