Rohde Schwarz Rohde & Schwarz HMO1002 2-channel oscilloscope, Digital Storage oscilloscope, 21-1002-RS00 数据表

also possible to zoom out at the maximum repeat rate if 
the STOP mode was run at fast time bases. If a high repeat 
rate can only be attained by means of low memory depth 
(as is the case with other manufacturers) it is nearly impos-
sible to zoom in retrospectively in STOP mode.

In interlace mode, ADC and storage of two channels are 
connected. This doubles the sampling rate and the acquisi-
tion memory. A channel is considered active even if it has 
been deactivated while still serving as the trigger source. If 
a channel is activated, the respective LED next to the input 
connector is illuminated. The following conditions must be 
met to activate the Interlace mode:

 ❙No active logic pod
 ❙None of the serial or parallel buses are active
 ❙Logic trigger not active

The interlace mode will be activated automatically. 

The R&S®HMO1002 features a memory depth of 1 MB. 
This allows the user to record long and complex signals 
which can be analyzed in full detail with the Zoom func-
tion. To activate this feature, press the ZOOM key 

40

. 

The screen will be divided into two sections. The upper 
window displays the entire time base window whereas 
the lower graticule shows an enlarged section of the 
upper window. The enlarged signal section is marked by 
two blue cursors in the original signal (upper window). If 
several channels are activated in Zoom mode, all displayed 
channels will be zoomed simultaneously by the same fac-
tor and at the identical position. Fig. 5.5 displays the Zoom 
window with 100 µs per division. The signal was captured 
within a time window of 12ms. The zoom area (lower grid) 
also displays the parameter for zoom time base whereas 
time is displayed above the zoom window. Z indicates the 
zoom time base (zoom factor) and determines the width of 
the zoom area displayed in the zoom window (10 divisions 
x scaling per division). Tz indicates the zoom time and de-
termines the position of the zoom area.

Fig. 5.5: Zoom function

The time base setting in the upper right of the display is 
highlighted in gray while the zoom time base above the 
zoom window is marked in white. The large knob in the 
HORIZONTAL menu is used to change the zoom factor. 
You can also press this knob. If the knob is pushed, the 
time base setting is highlighted in white and the zoom time 
base in gray. Now the knob is available to select the time 
base setting. This allows you to change time base settings 
without having to leave the zoom mode. Pressing the knob 
again will highlight the cursors limiting the zoom area in 
white, allowing you to use the knob to change the zoom 
area. Now you can use the small knob in the horizontal 
area of the control panel to move the position of the zoo-
med section across the entire signal. As described above, 
pressing the large knob enables you to set the time base 
but not the zoom factor. This in turn enables the small 
knob to move the trigger position to define the relationship
of pre- and post captures/records. 

In the acquisition mode ROLL, it is generally not possible 
to zoom in on the memory because the signal values of 
the X axis are always captured with the maximum memory 
depth. The acquisition mode NORMAL always includes 
more samples in the memory than what can be shown in 
the display. That explains why in this mode you are able 
to zoom in on the memory. The same does not apply to 
the values in the Y axis (amplitude). These values apply to 
a specified axis and can therefore also be scaled in ROLL
mode.

The X-POS. function (MENU key in the HORIZONTAL 
section) offers easy trigger time handling and allows it 
to be entered numerically. The soft menu keys allow you 
to set the trigger time to the minimum or the maximum 
value, for instance. You can use the soft menu key TIME 
REFERENCE to define where in the signal window to find
the trigger point value “0”. The signal is scaled by this refe-
rence point. You can use the universal knob in the Cursor/ 
Menu section to select the desired setting.

Markers allow you to highlight specific positions on the
screen, e.g. a rising or falling slope, an unexpected signal 
value or a search result. Markers can be used to identify 
specific signal sections to zoom in on and to analyze the
data more closely.

Use the soft menu to activate the marker function. Press 
the MENU key in the HORIZONTAL section to open the 
soft menu. Use the universal knob in the menu to select 
MARKER. Once this mode is activated, you can press the 
SET/CLR key to set a time marker at the 6th time unit (the 
menu in the center of the grid must be deactivated). The 
time markers are marked by a vertical line in gray-blue. 
The knob X Position allows you to move the signal inclu-
ding the set marker. After identifying an important signal