Tektronix VM700T, Руководство пользователя

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Waveform Mode
3- 10
VM700T Option 01 (NTSC) & Option 11 (PAL) User Manual
System Line
Changing the displayed line in Waveform mode or any of the manual modes
(Waveform, Vector, Picture, and Measure), changes the current line for all the
manual modes. This line is referred to as the “system line.” The leftmost line
number on the display is the system line.
However, both Vector mode and Measure mode can operate independently of the
system line. In Vector mode, you can select an independent Vector Line (found in
the Select Line menu in Vector mode). See
Vector Mode
, beginning on
page 3--17, for more information on the Vector Line. In individual measure-
ments, the Default Line Sel. soft key changes the displayed line to the measure-
ment line specified in the Measurement Locations file.
Cursors
The measurement set provides a set of cursors that enable you to make custom
measurements manually with a high degree of accuracy. You can use the cursors
to perform the following tasks:
H
measure time duration
H
measure frequency
H
measure luminance or chrominance amplitudes
H
measure rise or fall times
H
toggle quickly between any two points in a frame
Primarily, cursors are used to make measurements that are not automatically
made in Auto mode or Measure mode. They can also be used to verify some of
the automated measurements, should the need arise. Cursor measurement
accuracy is limited by the one percent vertical accuracy of the measurement set
display. Accuracy may be improved (at the expense of update speed) if Precision
mode is on.
The cursors, which are displayed when the Cursors soft key is selected, are two
vertical bars. The left cursor is a solid vertical line and the right cursor is a
dashed vertical line. When both cursors are on the same point, they appear as a
dotted vertical line. The default position for the cursors is the center of the
display.
Each cursor has a pair of horizontal amplitude reference markers that extend
from the cursor to the furthest left or right point the cursor touched on the
waveform. The anchor point of each amplitude reference marker is a short
vertical line on the waveform. The amplitude reference markers are cleared and
reset when the Reset Cursors, Center Left, or Center Right soft keys are selected.
Cursor Appearance
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