User manual

ManualsBrandsROHDE & SCHWARZ ManualsLaboratory Test EquipmentDigital HMO 1024 100 MHz 12-channel 1 null 1 null 8 Bit Digital storage (DSO), Mixed signal (MSO), Spec

Horizontal System

time base (for a timebaseof100μs/Divthesmallesttime

is2μs,for1μs/Divthecorrespondingtimevalueis20ns).

If events match the search criterium, they will be highligh-

ted. The soft menu VIEW EVENT TABLE allows you to dis-

play the search results in a table format. Use the arrow

keys or the universal knob in the CURSOR/MENU section

to navigate the events in STOP mode. SET allows you to

center the selected event. When the zoom function is acti-

vated, the selected event will automatically be centered in

the zoom window.

Fig. 5.7: Search mode with event list

6 Trigger System

The trigger system of the

R&S®HMO Compact series

is easy to handle by just ob-

serving the concept of instru-

ment operation. There are 4

keys destined for frequently

used functions:

❙ TYPE: selection of trigger

type (EDGE A/B), PULSE, LO-

GIC and VIDEO

❙ SLOPE: type of slope

❙ SOURCE: Determines the

triggers source

❙ FILTER: Determines the

trigger conditions

Additional keys are available to select the trigger modes

(AUTO, NORMAL and SINGLE).

6.1 Trigger modes Auto, Normal, Single

The AUTO/NORM

key allows you to toggle directly

between the basic trigger modes. If Auto mode is activa-

ted, the key is not illuminated. Pressing the key will acti-

vate NORMAL mode, and a red LED will highlight the

key. In AUTO mode, the screen always displays a signal. If

asignalfulllsthetrigger conditions, the oscilloscope will

synchronize with this event and triggers when the set con-

ditionismet.Incaseofasignalthatdoesnotfulllthe

trigger condition (a simple case would be direct current),

the oscilloscope itself will generate a trigger event. This al-

lows a glance at the input signals at any time, regardless

of the trigger condition. In NORMAL mode, the signal will

now be captured and displayed if the trigger condition is

met.Incasenonewsignalfulllsthesettriggercondition,

the signal that was triggered last will be displayed. To en-

sure that only a signal that meets the trigger condition is

detected and displayed, press the Single key to

activate

this mode. This key is highlighted in white when the SIN-

GLE mode is activated. The R&S®HMO Compact series de-

tection and trigger system is now activated, indicated by

a blinking RUN/STOP key

. If the trigger condition is ful-

lled,thetriggersystemisactivated,dataisstoredandthe

oscilloscope switches to STOP mode (the RUN/STOP key

is permanently highlighted in red).

6.2 Trigger sources

The two resp. four analog channels are available as trigger

sources (SOURCE key). If the optional extension with ac-

tive logic probes R&S®HO3508 including 8 digital inputs

is connected, up to 8 digital inputs are available as trigger

source. The soft menu key AC LINE enables you to trigger

the trigger at system frequency. The trigger signal is ext-

racted internally from the power supply.

Fig. 6.1: Front panel control

area of the trigger system