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ManualsBrandsUnbranded ManualsLaboratory Test EquipmentDigital Rohde & Schwarz HMO 724 70 MHz 12-channel 1 null 1 null 8 Bit Digital storage (DSO), Mixed signal (MSO), Spectr
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Vertical system
4 Vertical system
You can select vertical set-
tings using knobs for the ver-
tical position and the sensiti-
vity. You may also use a menu
that is permanently displayed
as well as an advanced menu.
You can select for which
channel you want the set-
tings to be activated by pres-
sing the respective channel
key (CH1...CH4). Once a chan-
nel has been activated, the
key will be marked by a co-
lored 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
21
key to activate the advanced menu.
4.1 Coupling
Theanalogchannelshaveaninputimpedanceof1MΩ
or50ΩwithR&S®HMO152xandR&S®HMO202x.The
R&S®HMO72x resp. R&S®HMO102x have only an input im-
pedance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lterof2Hzsuppressesthe
display of DC voltage. Signals of up to 200 V
rms
may be
connecteddirectlyto1MΩinputs.Highervoltagescanbe
measured with external probes (up to 40 kV peak voltage).
Fig. 4.1: Front panel area with
vertical system controls
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B
19
20
22
23
24
21
25
26
27
Fig. 4.2: Short menu for the vertical settings
Do not connect the 50 Ω inputs to effective voltage higher than 5V.
This should only be used with DC coupling. For all gene-
ral applications, the probes supplied with the instrument
willbeused.Theprobesarespeciedfor1MΩinputs.
With the HMO72x and HMO102x the RT-ZP03 probe is in-
cluded in delivery which offers 10:1 / 1:1 switchable at-
tenuation. The attenuation setting has to be set manually
in the channel menu. The HMO152x and HMO202x are
delivered with the HZO10 probe. The HZO10 probe has
an automatic attenuation 10:1 and an input impedance of
10MΩ.
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 ac-
tive. You can switch between channels by pressing the re-
spective 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 ac-
tivate 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 de-
termine 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 off-
set 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 ±15 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ltertothesignal
path. This will eliminate all higher frequency interference.
Toactivatethelterintheshortmenu,presstherespec-
Passive probes have be adjusted. Please refer to to the probe ma-
nual for the adjustment procedure.
The PROBE ADJUST output of the oscilloscope is only suitable
for 1:1 and 1:10 probes. 100:1 or 1000:1 probes require special
generators! Use the shortest possible ground connection to the
PROBE ADJUST output as shown in Fig. 4.3.
Fig. 4.3: Probe
connection to the
probe adjust output
max.
10
Vpk
BUS SIGNAL
SOURCE