User manual
45
Mixed-Signal-Operation
11 Mixed-Signal-
Operation
As a standard, the R&S®HMO3000 series is equipped with
the connectors for the R&S®HO3508 logic probe to add 8
resp. 16 digital logic inputs. All software required for the
mixedsignaloperationisalreadyincludedinthermware
of each instrument. It is only necessary to purchase and
connect the active R&S®HO3508 logic probe (8 channels).
With 4-channel instrument types (R&S®HMO3004) the
activation of the POD will deactivate the analog channel
3, activation of POD2 will deactivate the analog channel 4.
Thecongurationof3analogchannelsplus8digitallogic
channels (channel 1, 2, 3 and POD1) or 2 analog channels
and 16 digital logic channels (channel 1, 2 plus POD1 and
POD2) are possible.
11.1 Logic Trigger for Digital Input
11.2 Display Functions for the Logic Channels
With the 4-channel instrument types the short menu is
used to switch an analog channel to a digital channel. If
channel CH3 is activated and the short menu is displayed,
the digital channels 0 to 7 can be switched on via PO soft
menu key. To switch on the digital channels with 2-channel
instrument types, press the POD key in the VERTICAL
section. The digital channels 0 to 7 will now display on the
screen.
For the logic channels, a logic „1“ will be indicated by a bar
that is two pixels wide, and a logic „0“ will be indicated by
abarthatisonepixelwide.Thesetlogiclevelandagure
Fig. 11.1: Optional logic probe R&S®HO3508
Please nd an additional description of the logic trigger for the
inputs of the logic probe in chapter 6.5.
You must always set the level to distinguish between the logic
states (High/Low) in the VERTICAL MENU..
which shows the logical states will be shown next to the
namePOD1andPOD2intheinformationeldinthebot-
tom left of the display.
You may now choose the Y position and the size of the lo-
gic channel display just as you would for the analog chan-
nels. Use the knobs Y-POSITION
18
and VOLTS/DIV
20
to
select the settings (if the soft menu key “0/7“ is selected,
indicated by a blue background). If you wish to display
fewer than 8 logic channels or change the position and
size of a particular logic channel, you can use the short
menu in combination with the soft menu keys (channel 0
to 7) and the buttons Y-POSITION
18
and VOLTS/DIV
20
to
select the respective settings. You can choose a channel
by pressing the
and soft menu keys. This allows you to
resizeandpositionspecicchannelsindividually.
You can reset the position and size of the individual logic
channels on page 2|2 of the POD menu. You also have the
option to label the individual bits of the logic channel by
using the soft menu NAME. This name will be displayed
on the gridandtheprintout.Yourrstoptionistoswitch
the display on (ON) or off (OFF). The next option includes
the menu item LIBRARY. After selecting this option, you
can use the universal knob to choose a name from several
suggestions. The EDIT LABEL key allows you to enter
a completely new name or to customize the suggested
name. You may enter up to 8 characters. Use the ACCEPT
keytoconrmthenameintheeditor.Itwillthenbeshown
inthedisplay.Thenameisassignedtothatspecicsignal
and will move alongside any set offset value.
11.3 Display of Logic Channels as BUS
You also have the option to combine digital channels to
form buses which will then be displayed on the screen
as a cell in a table. Basically, two independent buses are
possible. For instance, it would be possible to combine an
8 bit address bus and an 8 bit data bus. To select the set-
tings for the buses, press the BUS button in he VERTICAL
section. Then press the MENU button in the VERTICAL
section. In the menu that opens you can press the top soft
menukeyBUStoselectwhichBUSyouwanttodene,
B1 or B2. You can use the soft menu key BUS TYPE to
Fig. 11.2: Logic channels’ settings display