Measurements
TDS 620A, 640A, & 644A User Manual
2Ć31
The snapshot selection in the Measurement menu lets you display almost all
of the measurements at once. You can read about snapshot under
Snapshot
of Measurements,
on page 3-95.
Automated measurements use readouts to show measurement status. These
readouts are updated as the oscilloscope acquires new data or if you change
settings.
Cursor Measurements
Cursors are fast and easy-to-understand measurements. You take measure-
ments by moving the cursors and reading their numeric values from the on
screen readouts, which update as you adjust the position of the cursors.
Cursors appear in pairs. One cursor is
active
and the other
inactive
. You
move the active cursor (the solid line) using the general purpose knob. The
SELECT button lets you select (toggle) which cursor bar is active or inactive.
The inactive cursor is a dashed line on the display.
To get the cursor menu, press the CURSOR button. There are three kinds of
cursors available in that menu:
H
Horizontal bar cursors
measure vertical parameters (typically volts).
H
Vertical bar cursors
measure horizontal parameters (typically time or
frequency).
H
Paired cursors
measure both vertical parameters (typically volts) and
horizontal parameters (typically time or frequency).
There are also two modes for cursor operation available in the cursor me-
nu —
independent
and
tracking
(See Figure 2-12).
Tracking Mode
Only Selected Cursor
Moves
Both Cursors Move
in Tandem
Independent Mode
Figure 2-12: Cursor Modes
H
Independent mode
cursors operate as was earlier described; that is, you
move
one
cursor at a time (the active cursor) using the general purpose
knob, and you use the SELECT button to toggle which cursor is active.
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