User Manual

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Figure 104 - Reference waveform
To Clear the Reference Waveform
The oscilloscope does not have a Clear option under the REF WAVE menu. To clear a reference
waveform, you can save a new reference waveform to the reference waveform's storage
location.
13 History Function
When the oscilloscope is in the running state (the Run/Stop button is lit with a green color), the
waveforms from the input channels are continuously recorded to the instrument's memory. Each
trigger event's data is called a frame. When the acquisition memory is full of frames, the oldest
frame is dropped to make room for the newest frame. The history features of the oscilloscope
let you see these stored frames.
To use the history function, the oscilloscope must not be in XY mode (press the Acquire button
and ensure the XY softkey set to Off).
Do the following to replay a waveform's history:
1. Press the History button to enable the History function.
 When the oscilloscope is in the run state, it will change to the stop state (the Run/Stop
button will be red).
 When in the stop state and the history function is enabled, the oscilloscope will remain
in the stop state.
 Press the History or Run/Stop buttons to turn off the history function (if you're not in
the HISTORY menu, you'll have to press the History button twice).
2. Press the List softkey to turn the list display on or off. The list displays the acquisition time of
each frame (the times are accurate to the microsecond).