Agilent Technologies 42A User Manual

4-25

Run/Stop/Single/Infinite Persistence Operation

During an acquisition, the oscilloscope examines the input voltage at 
each input probe.

• For analog channels, the input voltage is determined by the vertical 

volts/division settings.

• For digital channels, at each sample the oscilloscope compares the 

input voltage to the logic threshold. If the voltage is above the 
threshold, the oscilloscope stores a 1 in sample memory; otherwise, 
it stores a 0.

To control the  acquisition process, you can do the following:

• Perform continuous acquisitions by pressing 

 (key is 

illuminated green), and stop the acquisitions by pressing 

 

again (key is illuminated red).

• Take exactly one acquisition, then stop by pressing the 

 key.

• Store the results of several acquisitions by using infinite persistence 

when the scope is running.

• Erase the results of all acquisitions by pressing 

 in the 

Display menu.