Reference
TDS1000/2000-Series Digital Oscilloscope User Manual 101
Trigger Frequency Readout
The oscilloscope counts the rate at which trigger events occ ur to
determine trigger frequency a nd displays the frequency in the lower
right corner of the screen.
Key Points
Mode Options.
Mode option Details
Auto (default) Forces the oscilloscope to t rigger when it doesnot detect a
trigger within a certain amount of timebased on the SEC/DIV
setting; you can use thismode in many situations, such as to
monitor the level of a power supplyoutput
Use this mode to let the acquisitionfree-run in the absence of a
valid trigger; thismode allows an untriggered, scanning
waveform at 100 ms/div or slowertime base settings
Normal Updates displayedwaveforms only when the oscilloscope
detects a valid triggercondition; the oscilloscope disp lays older
waveforms until the oscillosco pe replaces them with new ones
Use this mode when you want to see only validtriggered
waveforms; when you use this mode,the oscilloscop e doesnot
display a waveform until after the first trigger
To perform a Single Sequence acquisition, push the SINGLE SEQ
button.