Specifications

23
Subject to change without notice
all backlit keys and all other LED displays on the front panel.
After selecting the menu items PERSISTENCE and ADJUST the
persistence function can be dened: there are 3 choices for the
duration of the persistence: OFF, AUTOMATIC and MANUAL. In
MANUAL operation, the duration can be changed with the uni-
versal knob from 50 ms to innity. If a nite time was selected,
the signal periods will be written on top of each other such that
the brightness will diminish from recent to oldest. If e.g. 300 ms
is selected, the signal curves will become darker in 50ms steps
and erased after 300 ms. In this soft menu the function BACK-
GROUND may be activated in addition: then all signal curves
ever displayed will be shown in the darkest colour.
Fig. 7.3: Persistence function
This kind of display is for example very useful for the analysis
of extreme values of different signals.
7.4 XYdisplay
The HMO has a key for directly switching to the XY function.
In this mode, two signals will be displayed, one in Y, one in X
direction. The usual time base will be replaced by the ampli-
tudes of the second signal. With harmonically related signals
the resulting curves are called Lissajous patterns; from such
displays the frequency and phase relationships of the signals
may be derived. The XY function will be activated by pushing the
XY key in the CHANNEL CONTROL section of the front panel;
the key will light up, and the screen will be partitioned in a large
and some small display elds: the large display will show the
XY presentation, the small elds will show the sources of the X,
the Y1, Y2 and Z signals; those signals will be displayed vs. time
as usual. It is possible to dene two signals as the Y signal and
display this vs. the X signal in order to perform a comparison.
In order to dene which signal should be X, Y1, Y2 or Z, it is ne-
cessary to call the menu by a pushing the XY key a second time.
In this menu the desired settings may be performed.
In order to select the Z input setting please push the soft menu
key next to the menu item , this will open the next
menu level. The Z input allows control of the intensity of the X-Y
curve. This intensity may be either set to a desired level or it may
be dynamically modulated by the amplitudes at the Z input.
Fig. 7.5: Settings for the Z input
In this menu you can rst activate the Z input (top menu item 
or , the activated mode will be backlit in blue). In the next
menu item all channels are offered as inputs, the selection is
performed with the universal knob and activated by pushing
the respective menu key next to . The following menu
item allows you to dene the intensity setting. The menu key will
toggle between  and . If  is
selected, the XY signal will be intensity modulated by the amp-
litude at the Z input. The intensity will be proportional to the Z
input signal amplitude. If  is selected, all XY points below
a certain level at the Z input will be shown dark, and all above
this level will be bright. The level can be set with the universal
knob after pushing the respective soft menu key.
Pushing the XY key in the CHANNEL CONTROL section of the
front panel again will terminate the XY function if it was active.
If no or another menu should be active, it will be necessary to
push the XY key twice for terminating the function.
Fig. 7.4: Settings in the X–Y menu
Trigger System