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Vertical System
4 Vertical System
You can select vertical set-
tings using knobs for the
vertical position and the
sensitivity. You may also use
a menu that is permanently
displayed as well as an ad-
vanced menu. You can select
for which channel you want
the settings to be activated
by pressing the respective
channel key. Once a channel
has been activated, the key
will be marked by a colored
LED light. Additionally, the
screen display will include a
frame around the activated
channel with a frame and a
color brighter than that of deactivated channels. The cor-
responding short menu is always visible and you can push
the Menu
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key to activate the advanced menu.
4 .1 Coupling
The analog channels have an input impedance of 1 MΩ or
50Ω with the R&S®HMO1202 series. The R&S®HMO1002
series have only an input impedance of 1 MΩ.
.
The 50 Ω input impedance should only be selected if the
signal
source is 50 Ω, e.g. a generator with a 50 Ω output
where the termination within the scope is to be used. In
all other cases 1 MΩ is to be selected. The user determi
-
nes if DC coupling or AC coupling is to be used. With DC
coupling, the DC voltage of the signal will be displayed.
With
AC coupling, an input filter of 2 Hz suppresses the
display of DC voltage. Signals of up to 200 V (peak value)
may be connected directly to 1 MΩ inputs. Higher voltages
can be measured with external probes (up to 40 kV peak
voltage). This should only be used with DC coupling. For
all general applications, the probes supplied with the ins-
Fig. 4.1: Short menu for vertical settings
Do not connect the 50 Ω inputs to effective voltage higher than 5V.
trument will be used. With the R&S®HMO1002 series the
HZ154 probe is included in delivery which offers 10:1 /
1:1 switchable attenuation. The attenuation setting has to
be set manually in the channel menu. The R&S®HMO1202
series is delivered with the RT-ZP03 probe.
You can set the coupling using the short menu or channel
menu. Simply press the respective soft menu key to set
the coupling and the graphic inversion of the input chan-
nel. The menu applies to the corresponding active channel.
The illuminated channel key indicates which channel is
active. You can switch between channels by pressing the
respective channel key.
4 .2 Sensitivity, Y Positioning and Offset
You can select the sensitivity of the analog inputs by using
the knob in the VERTICAL section (VOLTS/DIV) in 1-2-5
steps of 1mV/div to 10V/div. The knob is associated with
the active channel (push the respective channel key to
activate the desired channel). Pushing the knob once will
switch to a continuous sensitivity setting. You can use
the smaller knob in the VERTICAL section (POSITION) to
determine vertical settings for the active channel. Press
the MENU key to access advanced options. On page 2|2 of
this menu, you can add a DESKEW. To activate this offset
push the corresponding soft menu key. You can set the
offset value using the universal knob or the KEYPAD key
in the CURSOR/MENU section. Each analog channel may
be shifted in time by ±32 ns. This deskew setting is used
to compensate different signal delays when using different
cable lengths or probes.
4 .3 Bandwidth Limit and Signal Inversion
Both the short menu and the advanced menu enable you
to insert an analog 20 MHz
low pass filter to the signal
path. This will eliminate all higher frequency interference.
To activate the filter in the short menu, press the respec
-
tive soft menu key BWL. In the advanced channel MENU
the bandwidth limit will be set with the soft menu key
BANDWIDTH. Once the filter is activated, the menu item
will be marked in blue, and the identifier BW will be dis
-
played in the channel information window. Signal inversion
is available in the short menu and the advanced menu in
the VERTICAL section. An activated filter will be indicated
in blue in the menu and by a bar above the channel name
in the channel name window.
4 .4 Probe Attenuation and Unit Selection
(Volt/Ampere)
The R&S®HMO1002 resp. R&S®HMO1202 series does not
includes an integrated probe attenuation detection. You
can manually set the attenuation factor in the advanced
MENU in the VERTICAL section. This is possible with the
predefined steps x1, x10, x100, x1000 or, using the univer
-
sal knob or the KEYPAD key, as defined by the user from
x0.001 to x1000. In this menu, you can also select the unit
Ampere in case you are using a current probe. If you select
the unit Ampere (A), the menu shows the most common
factors (1V/A, 100mV/A, 10mV/A, 1mV/A). You may also
Fig. 4.1: Control panel for the
vertical system
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