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Measurements
TDS 620A, 640A & 644A User Manual
2Ć27
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 3Ć92.
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 easyĆtoĆunderstand measurements. You take measureĆ
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 meĆ
nu Ċ independent and tracking (See Figure 2Ć9).
Tracking Mode
Only Selected Cursor
Moves
Both Cursors Move
in Tandem
Independent Mode
Figure 2Ć9:ăCursor 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.