Specifications

32
Subject to change without notice
11 Mixed Signal Operation (optional)
All HMO series instruments are provided with the connectors for
the HO3508 logic probes necessary to add 8 or 16 digital logic
channels. The rmware required for Mixed Signal operation is
already contained in each HMO, only the HO3508 active logic
probes need to be bought and connected. With the 4-channel
oscilloscope activation of Pod1 will deactivate the analog chan-
nel 3, and activation of Pod2 will deactivate the analog channel
4. Hence these congurations are possible: 3 analog channels
plus 8 digital logic channels (Channels 1,2,4 and Pod1) or 2
analog channels with 16 digital logic channels (Channels 1,2
plus Pod1 plus Pod2).
11.1 Logictrigger
STOP
TiPP
You may test all the settings without a logic probe con-
nected, however, the functions will only be effective
with a HO3508 probe connected.
By selecting LOGIC trigger in the soft menu after pushing the
key TYPE the trigger source will be routed to the digital logic
inputs. If you now push the key SOURCE, a soft menu will open
up which offers further settings and a window for a display.
(refer to Fig. 11.1).
The top soft menu is used to preselect the logic channel for
which the trigger condition is to be dened. This is done with
the universal knob. The selected digital input will be marked
with a blue background in the general menu; in the eld the
trigger level (high) H or (low) L or (any) X will be indicated.
The selection of the logic level is done with the respective soft
menu key. The selected level will also be marked with a blue
background in the soft menu. Another menu selects the logic
combination of the digital logic inputs; they can be combined by
logic AND, OR. If AND is selected, then both conditions must be
met simultaneously for the result to go high H. If OR is selected
either one or both conditions must be met. The last item in this
menu is called . With the soft menu key  or
 can be chosen. This allows you to preselect whether the
trigger shall be generated at the beginning (TRUE) or the end
(„FALSE“) of the logic condition.
After selecting the desired set of conditions, you may push
FILTER for more settings. A soft menu will have opened which
allows you to limit the trigger TRUE condition further in time
(in this menu that condition will appear which you choose in the
Fig. 11.1: Logic trigger menu
However, it is required that the necessary settings for the desti-
nation, the name etc. have been previously dened as described
in the preceding chapters. In order to open the settings menu
of the FILE/PRINT key, push the SAVE/RECALL key for calling
its main menu, then select the menu item .
Fig. 10.8: Denition of FILE/PRINT key
By pushing the respective menu key, it is possible to dene the
action which shall take place upon pushing the key, the following
actions are available:
–  stores settings of the instrument
–
 stores curves
–  stores screen photos
–
 stores screen photos and settings
–  prints directly to a postscript
printer
After the selection of the desired action by pushing the respective
key, the acceptance will be conrmed by the blue background.
By pushing MENU OFF the menu will be switched off.
Documentation, storing and recalling