User manual
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Signal Display
soft menu key is active (highlighted in blue), a value can
be entered in the CURSOR/MENU section via universal
knob or numerically via KEYPAD button. You may enter
any value between 50 ns and 10 s. The bottom section of
the soft menu key OFF (highlighted in blue) allows you to
deactivate the function HOLD OFF.
6.3.6 Runt Trigger
A runt is a pulse lower than normal in amplitude. The
amplitudecrossestherstthresholdtwiceinsuccession
without crossing the second one. For example, this trigger
can detect logic, digital, and analog signals remaining
belowaspeciedthresholdamplitudebecauseI/Oports
areinundenedstate.ViaFILTERmenuthePOLARITY of
thepulsecanbeset(directionoftherstslope).Apositive,
negative or both polarity can be set. For the associated
positivepulse,youdenethewidthfromrisingtofalling
slopes, and accordingly for the associated negative pulse
from falling to rising slopes.
6.3.7 Risetime Trigger
The rise time trigger, also known as slew rate or transition
trigger, can detect fast or slow rising edges selectively. It
triggers on edges, if the rise time from the lower to higher
voltagelevel(orviceversa)isshorterorlongerasdened,
orinsideoroutsideaspeciedtimerange.Thetrigger
ndsslewratesthatarefasterthanexpectedorpermissi-
ble to avoid overshooting and other interfering effects. It
also detects very slow edges violating the timing in pulse
series. Via FILTER menu the POLARITY can be set. A po-
sitive, negative or both polarity can be set. The soft menu
COMPARISON selects how the time limit for the slew rate
isdened.Thetimemeasurementstartswhenthesignal
crossesthersttriggerlevel-theupperorlowerlevelde-
pending on the selected slope - and stops when the signal
crosses the second level. The following COMPARISON
functions are available:
❙ Greater than: Triggers on transition times longer than the
given rise time
❙ Lower than: Triggers on transition times shorter than the
given rise time
❙ Equal: Triggers on transition times inside the time range
rise time ± variation
❙ Not equal: Triggers on transition times outside the time
range rise time ± variation.
For the comparisons „Greater than“ and „Lower than“, the
RISETIMEsettingdenestheminimumandmaximum
transition time limits, respectively. For the comparisons
„Equal“and„Notequal“,theRISETIMEsettingdenes
thecenterofarange,whichisdenedbyVARIATION. The
softmenukeyVARIATIONdenesatimerangearoundthe
given RISE TIME value.
Changing the time base does not impact the selected hold off
time.
7 Signal Display
The following chapter describes the selection and display
of signals from various sources as well as all available dis-
play modes.
7.1 Display Settings
The R&S®HMO3000 series features a high quality TFT dis-
play with VGA (640x480 pixels resolution) including LED
backlighting.Basicdisplaysettingscanbedenedbypres-
sing the DISPLAY
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key in the GENERAL section. 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 win-
dow within the 20 divisions of the virtual screen. You will
ndadetaileddescriptionoftheVIRTUALSCREENoption
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.
Normally, 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
universalknobortheKEYPADkeytodenethissetting.
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