Reference
TDS1000/2000-Series Digital Oscilloscope User Manual 107
Knobs and Buttons
LEVEL or USER SELECT Knob. Use to control t he Trigger Level,
Trigger Holdoff, Video Line Number or Pulse Width. The primary
function of this knob is to set the trigger leve l. When an alternative
function is active, the USER SELECT LED lights belowthe knob.
USER SELECT Description
Holdoff Setsthe amount of time before another trigger event can
be accepted; to switch between the TriggerLevel and
Holdoff functions, changethe Trig Knob option in the
Horizontal Menu
Video line number Sets the oscilloscope to a specific line nu mber when the
Trigger Typeoption is set to Video and the Sync option is
set to Line Number
Pulse width Sets the width of the pulse when the Trigger Typeoption is
set to Pulse and you selectthe Set Pulse Wdith option
SET TO 50% Button. Use the SET TO 50%button to quickly stabilize a
waveform. The oscilloscope automatically sets theTrigger Level to
be about halfway between the mini mum and maximum voltage
levels. This is useful when you connect a signal to the EXT TRIG
BNC and set the trigger source to Ext or Ext/ 5.