Tektronix TPS2012B, User Manual

Page: 55 / 184

Understanding Oscilloscope Functions
4. Continues to acquire data until the waveform record is full.
5. Displays the newly-acquired waveform.
NOTE.
For Edge and Pulse triggers, the oscilloscope counts the rate at which
trigger events occur to determine trigger frequency. The oscilloscope displays
the frequency in the lower right corner of the screen.
Source You can use the Trigger Source options to select the signal that the oscilloscope
uses as a trigger. The source can be any signal connected to a channel BNC, or
to the Ext Trig BNC.
Types The oscilloscope provides three types of triggers: Edge, Video, and Pulse Width.
Modes You can select the Auto or the Normal trigger mode to de fi ne how the oscilloscope
acquires data when it does not detect a trigger condition. (See page 113, Mode
Options .)
To perform a single sequence acquisition, push the Single button.
Coupling You can use the Trigger Coupling option to determine which part of the signal
will pass to the trigger circuit. This can help you attain a stable display of the
waveform.
To use trigger coupling, push the Trig Menu button, select an Edge or Pulse
trigger, and select a Coupling option.
NOTE. Trigger coupling affects only the signal passed to the trigger system. It
does not affect the bandwidth or coupling of the signal displayed on the screen.
To view the conditioned signal being passed to the trigger circuit, push and hold
down the
Trig View button.
Position The horizontal position control establishes the time between the trigger and the
screen center. Refer to
Horizontal Scale and Position; Pretrigger Information
for information on how to use this control to position the trigger. (See page 31,
Horizontal Scale and Position; Pretrigger Information .)
Slope and Level The Slope and Level controls help to de fi ne the trigger. The Slope option (Edge
trigger type only) determines whether the oscilloscope fi nds the trigger point on
the rising or the falling edge of a signal. The Trigger Level knob controls where
on the edge the trigger point occurs.
TPS2000B Series Digital Oscilloscope User Manual 29