User manual

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Signal Display
7.3 Signal intensity and persistence functions
The default setting (indicated as active when the INTENS/
PERSIST
7
key is illuminated in white) allows you to use
the universal knob to change the intensity of the signal dis-
play to anywhere from 0% to 100%. Persistence mode al-
lows the display of varying signals by enabling the inst-
rument to write several signals on the display simultane-
ously. It is also possible to induce accelerated aging of si-
gnalswithanadjustablepersistencefrom50mstoinnite.
Signals occurring less frequently will be displayed in dar-
ker color and signals occurring more frequently will be dis-
played in lighter color. Press the INTENS/PERSIST key in
the soft menu to select this mode. The soft menu items
TRACE, GRID and BACKLIGHT allow you to use the uni-
versal knob in the CURSOR/MENU section to adjust the
grid intensity and the backlighting. The soft menu SET-
TINGS allows you to select the persistence settings for
the signals on the screen. The persistence function ensu-
res that signals will not be replaced when the screen is up-
dated.Instead,thesignalswillpauseforaspecicamount
of time and then slowly begin to fade. This type of display
is very similar to that of an analog oscilloscope. There are
three possible settings for the duration of the persistence:
OFF, AUTOMATIC and MANUAL.
The option MANUAL allows you to set a duration of 50ms
toinnitebyusingtheuniversalknobortheKEYPAD
Fig. 7.2: Menu for setting the signal display intensities
Fig. 7.3: Persistence function
key.Ifanitedurationwasselected,newsignalswillbe
written on top of one another within this timeframe where
the most recent captures will be displayed more brightly
than older signals. For instance, if 300 ms is selected, the
display for the signal curves will become darker in 50ms
intervals and will be erased after 300 ms. The AUTOMATIC
settingallowsyoutoselecttheautomaticcongurationof
the persistence. If this setting is activated, the instrument
attempts to select the optimal time. If OFF is selected, the
persistence function is deactivated.
Another available option is the BACKGROUND function.
With this key, you can activate or deactivate a mode which
allows older signal curves to not disappear entirely after
the set persistence time. Instead, these signals will con-
tinue to be displayed in the background with low bright-
ness. This display is useful for the analysis of peak values
in signals, for instance.
7.4 XY display
The R&S®HMO Compact series features a key that allows
you to switch directly to the XY display. Two signals will
be displayed simultaneously, one in Y direction and one in
X direction. This implicates that the time base X will be re-
placed by amplitude values of a secondsource. The resul-
ting signal curves for harmonic signals are known as Lissa-
jousguresandallowtheanalysisoffrequencyandphase
position for these two signals. In case of a nearly identi-
calfrequencythegurewillrotate.Ifthefrequencyisex-
actlyidentical,thegurewillstandstillandthephasepo-
sition can be deduced from its shape. You can activate the
XY display by pressing the XY key
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in the VERTICAL sec-
tion. The display will divided into one large and three small
display areas.
The large grid shows the XY display while the small grids
show the source for X, Y1, Y2 and Z. The small windows
feature the classical signal display as Y vs. time. The ana-
With two-channel instruments R&S®HMO722, R&S®HMO1022,
R&S®HMO1522 and R&S®HMO2022 only basic XY display is
possible.
Fig. 7.4: XY settings menu