User`s manual

1-17
IM 701610-01E
Functions
1
History Memory <Section 7.6>
The oscilloscope automatically retains the last N waveforms recorded. The value of N
varies in the range 2 to 4000 for the DL1620/DL1640 (2 to 16000 for the DL1640L)
depending on the record length and high-resolution mode. The oscilloscope retains all
waveforms for the first N triggers; then, for each subsequent trigger, the oscilloscope
overwrites the oldest stored waveform. You are free to switch the display from the
current (newest) waveform to any of other N-1 waveforms in the history. The illustration
below shows how data can be displayed, assuming N = 1024.
Saved Waveform Data of Previous 1024 Triggers
Selected Record No. 0
Selected Record No. –25
Current Waveform Display
(Select Record = 0)
Any Former Waveform Display
(Select Record is Selectable in the Range 0 to –1023)
In addition, a particular waveform can be found from the past waveforms that are held.
Display Settings <Chapter 8>
Display Format → Section 8.1
• You can display waveforms from different channels in different windows. You can
choose to use 1 window (Single), 2 windows (Dual), or 4 windows (Quad).
(4 windows (Quad) is not available on the DL1620.)
• You can select either of the following two methods for assigning channels to windows.
Auto: Channels that are set to ON are displayed in order of channel number, with the
lowest channel displayed in the top window.
Fixed: Channels are displayed in order of channel number, regardless of whether ON
or OFF.
User: Arbitrarily assign the channels to the split screens, regardless of wether or nor
the channel display is turn ON.
Graticule → Section 8.3
Use this feature to select use of grid, frame, or “cross” graticule.
Scale Values → Section 8.4
If the Scale Value setting is ON, the screen displays numerical values at the top and
bottom of the vertical axis and the horizontal axis.
1.4 Setting the Acquisition and Display Conditions