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InfiniiVision Oscilloscopes User’s Guide 177
AutoScale
Press the [AutoScale] key to quickly display the input signals.
How AutoScale works
AutoScale automatically configures the oscilloscope to best display the input signals by
analyzing any waveforms present at each channel and at the external trigger input. This
includes the digital channels on MSO models.
AutoScale finds, turns on, and scales any channel with a repetitive waveform that has a
frequency of at least 50 Hz, a duty cycle greater than 0.5%, and an amplitude of at least
10 mV peak-to-peak. Any channels that do not meet these requirements are turned off.
The trigger source is selected by looking for the first valid waveform starting with external
trigger, then continuing with the highest number analog channel down to the lowest
number analog channel, and finally (if the oscilloscope is an MSO) the highest number
digital channel.
During AutoScale, the delay is set to 0.0 seconds, the sweep speed setting is a function of
the input signal (about 2 periods of the triggered signal on the screen), and the triggering
mode is set to Edge. Vectors remain in the state they were before the AutoScale.
Undo AutoScale
Press the Undo AutoScale softkey to return the oscilloscope to the settings that existed
before you pressed the [AutoScale] key.
This is useful if you have unintentionally pressed the [AutoScale] key or do not like the
settings AutoScale has selected and want to return to your previous settings.
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