9-2
IM DLM3054-01EN
Reference Waveforms
If you set the computation mode to Ref, you can display reference waveforms. The following waveforms can be
used as reference waveforms.
• Waveforms displayed on the screen: You can load waveforms using the Load from soft key.
• Waveforms saved in the past: You can load waveforms using the load feature of the FILE menu.
Loading the Reference Waveform (Load from)
The reference waveform is set to the waveform displayed on the screen. Select the waveform to load into Ref1
to Ref4 from one of the settings below. Data that exceeds 25 Mpoints is loaded by sampling.
CH1 to CH4, Math1* to Math4*
* You cannot select Math1 for Ref1, Math2 for Ref2, Math3 for Ref3, or Math4 for Ref4.
Measurement and Computation Using Reference Waveforms
• If a reference waveform is displayed and you set the measurement source of cursor measurement to Math1
to Math4, you can perform cursor measurement or automated measurement of waveform parameters on the
reference waveform.
• If reference waveform Ref1 is displayed and you set the computation source waveform of Math2 to Math1,
you can perform computation using reference waveform Ref1. The same holds true for Math1 and Math2 for
Math3 and Math1 to Math3 for Math4.
Vertical Position (Position)
You can move the reference waveform vertical position within ±4 divisions.
• In computation where the time axis is different between the reference waveform and input waveform, the
instrument interpolates or compresses the reference waveform data so that the number of data points for
both waveforms is the same.
• You cannot change the reference waveform time axis.
• Reference waveforms whose record length is 25 Mpoints or less are backed up when they are loaded.
However, if you turn on the instrument while holding down the RESET key, the settings are set to their
factory defaults, and the reference waveforms are cleared.
• To load a file that contains waveform data of multiple channels as a reference waveform, use Load to
Channels on the menu for loading waveform data from files into channels, and then load a waveform as a
reference waveform.
9 Computed and Reference Waveforms