Rohde Schwarz Rohde & Schwarz HMO1002 2-channel oscilloscope, Digital Storage oscilloscope, 21-1002-RS00 데이터 시트

12  Mixed-Signal 

Operation

As a standard, the R&S®HMO1002 is equipped with the 
connectors for the HO3508 logic probes to add 8 digital 
logic inputs. All software required for the mixed signal 
operation is already included in the firmware of each HMO.
It is only necessary to purchase and connect the active 
HO3508 logic probes (8 channels). If you activate the POD, 
analog channel 2 will be deactivated automatically. This 
only allows the configuration of 1 analog channel + 8 logic 
channels on the screen.

To switch on the digital channels, press the POD key in 
the VERTICAL section. The digital channels 0 to 7 will now 
display on the screen. For the series HMO3002, the logic 
channels are activated by pressing the keys POD1 and 
POD2 on the front panel. For the logic channels, a logic 
One will be indicated by a bar that is two pixels wide, and 
a logic Zero will be indicated by a bar that is one pixel 
wide. The set logic level and a figure which shows the
logical states will be shown next to the name POD in the 
information field in the bottom 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 

Fig. 12.1: Optional logic probe HO3508

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 
resize and position specific channels individually.

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 grid and the printout. Your first option is to switch
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 
key to confirm the name in the editor. It will then be shown
in the display. The name is assigned to that specific signal
and will move alongside any set offset value.

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 
menu key BUS to select which BUS you want to define, B1
or B2.

You can use the soft menu key BUS TYPE to choose the 
BUS type for the display and the analysis. The BUS type 
determines the bus structure and is organized differently 
depending on serial vs. parallel or the number of data 
and clock signals. The universal knob allows you to se-
lect the BUS type PARALLEL or PARALLEL CLOCKED. 
Select CONFIGURATION to determine the bus source 
and structure. The contents of the menu change with the 
selected BUS type. After pressing the top soft menu key 
BUS WIDTH, you can use the universal knob to select 
a bus width from 1-8 bits. The table displaying the bit 
assignments will be adjusted dynamically depending on
your choice. Each bit of the displayed bus has a source. 
The source refers to the individual POD bits. Based on the 
measurement setup, the sources can be assigned via soft 
menu key SOURCE and the universal knob. 

The soft menu keys PREVIOUS/NEXT BIT allow you to 
move the position of the selection bar for the source of the 
individual bits. The selected bit is highlighted in blue. The 
left side of the table contains the bits in fixed sequence,
beginning at the top with D0 (= LSB). The universal knob 
allows you to assign a real logic channel to the selected 
BUS bit. The allocation is not subject to restrictions; you