Reference
80 TDS1000/2000-Series Digital Oscilloscope User Manual
The Autoset function exami nes all channels for signals and displays
corresponding waveforms.
Autoset determines the trigger source based on the following
conditions:
HIf multiple channels havesignals, channel with the lowest
frequency signal
HNo signals found, the lowest-numbered channel displaye d when
Autoset was invoked
HNo signals found and no channels displayed, oscilloscope
displays and uses channel 1