30
Subject to change without notice
T r i g g e r S y s t e m
7 Display of signals
The following chapter describes the selection and display of
signals from various sources and the available display modes.
7.1 Display settings
The HMO72x...202x series features a high quality TFT display
with VGA (640x480 pixels resolution) including LED backlighting.
Basic display settings can be defined by pressing the DISPLAY
14
key in the GENERAL control panel. When the soft menu item
VIRTUAL SCREEN
is activated, a scroll bar will display to the
right of the display graticule. Use the universal knob to upload
and download the display window within the 20 divisions of the
virtual screen. You will find a detailed description of the VIRTUAL
SCREEN option in the next chapter.
The following settings can be selected:
DOTS ONLY:
If this option is activated (ON), only the acquired data points will
be shown. This means that the data points of all signals will not
be connected by vertical lines. If this option is deactivated (OFF),
interpolated data points will also be shown.
INVERSE BRIGHTN.:
This setting inverts the brightness of the displayed signals. Nor
-
mally, frequently captured dots will be displayed more brightly
than rare dots. The
INVERSE BRIGHTNESS
option reverses
the circumstances. Rare events display a higher brightness
compared to frequent events. To capture rare events in a signal,
this setting can be used in combination with persistence.
FALSE COLORS:
This setting converts the brightness levels of the displayed
signals to a color scale (ranging anywhere from blue, magenta,
red and yellow to white). Thanks to the higher contrast, users
can view signal details more easily. This setting applies to all
signals simultaneously.
GRID:
This soft menu allows you to display the graticule as LINES
(the graticule is divided into horizontal and vertical divisions),
as CENTER CROSS (displays one horizontal and one vertical
zero line, showing the divisions as dots) or as OFF (the entire
graticule will include no dots or lines).
INFO WINDOWS:
Selecting this soft menu item will open a submenu which allows
you to set the transparency for the info windows. Info windows
are small windows that appear on the screen depending on the
particular application (e.g. values are displayed when offset is
changed). A transparency value of 0% to 100% is selectable. Use
the universal knob
4
to define this setting. Additional menu
items allow you to activate or deactivate the info windows for
POSITION and TRACE BRIGHTN.. If POSITION is activated and
the vertical position is changed, the respective value on the zero
line will be displayed. Depending on the selected
trigger type, the
user will see specific information about the acquisition status.
This information will only be displayed if the signal changes on
the screen can persist over a longer period. If the trigger condi
-
tion has been met, the information window shows a progress
display for the post-trigger and pre-trigger. If the trigger condi-
tion has not been met, the information window shows the time
of the last trigger event (Trig?). If the trigger type AUTOMATIC
is selected, the instrument will switch to non-triggered
acquisi
-
selects all lines i.e. even when other
trigger conditions are met,
the oscilloscope will trigger on each line. If FRAME is selected
for frame triggering, the lower menu items will allow to trigger
on
ODD
or only
EVEN
half frames. In this case, the oscilloscope
will trigger on the start of the half frames in the video signal.
The respective key will select the odd (even) half frames, i.e.
even if the other
trigger conditions are met, the oscilloscope
will trigger on each odd (even) half frame.
The following modes are available:
PAL, NTSC, SECAM, PAL-M and
SDTV 576i
Interlaced
HDTV 720p Progressive
HDTV 1080p Progressive
HDTV 1080i Interlaced
