Specifications
33
Subject to change without notice
SOURCE menu). A time limit can be added by pushing the top
soft menu key. The reference criterion can be selected in the
menu eld below by the respective soft key.
These 6 criteria are available:
ti ≠ t: The duration of the bit pattern which will generate the
trigger is unequal to the reference time.
ti = t: The duration of the bit pattern which will generate the
trigger is equal to the reference time.
ti < t: The duration of the bit pattern which will generate the
trigger is smaller than the reference time.
ti > t: The duration of the bit pattern which will generate the
trigger is greater than the reference time.
t
1
<ti<t
2
: The duration of the bit pattern which will generate the
trigger is smaller than the reference width t
2
and greater
than the reference width t
1
.
not(t
1
< ti<t
2
): The duration of the bit pattern which will generate
the trigger is greater than the reference width t
2
and
smaller than the reference width t
1
.
By the same procedure as with pulse trigger the reference time
is adjusted with ti ≠ t and ti = t by turning the universal knob after
pushing the soft key next to TIME. By selecting DEVIATION the
universal knob allows you to dene a tolerance interval. If ti < t
or ti > t was chosen only one limit may be set. Both options with
two references (t
1
and t
2
) can be set due to pressing the respective
soft key and turning the universal knob.
If you desire to change the levels for logic ONE or ZERO you will
have to choose the channel menu. Select the appropriate POD
(POD1 with the key CH3/POD, POD2 with the key CH4/POD2).
If the logic mode was already selected, you will see the digital
logic channels, and the display will show in its channel infor-
mation section the framed message: „POD1:xxxV“ or „POD2:
xxxV“. If information about the analog channels 3 and 4 should
be shown there, push the key next to the lowest soft menu entry
(before pushing the key it will read: „POD1“ or „POD2“). This
will activate the digital channels. If you now push the key MENU
in the „Channel Control“ section of the front panel, you will be
able to select from 5 predened logic levels, three of them are
xed for TTL, CMOS, and ECL, two are user denable and may
be set from –2 V to +8 V with the universal knob after pushing
the respective key.
11.2 Displayfunctionsofthelogicchannels
With the HMO the short menu in the channel settings is used
to switch an analog channel to a digital channel. If you should
nd there data belonging to the analog channels 3 and 4, press
the key next to the lowest soft menu entry. This is a double key:
the upper designation CH stands for channel, the lower one
PO for pod. Pressing this key will alternate between those two
modes. The mode which is presently active will have its back-
ground shown in the colour of the respective channel. Activate
the Pod here. If you now press the MENU key in the CHANNEL
CONTROL area of the front panel, you can select one of ve
preset logic level settings.
With the logic channels, a logic ONE will be indicated by a bar
of two pixels width, a logic ZERO will be one pixel wide. The
information eld in the lower left corner of the screen will show
the actual sampling rate and the logic levels selected next to
the names POD1 and POD2.
The Y positions and the size of the logic channel displays can
be chosen as customary and known from analog channel
operation with the appropriate knobs Y-POSITION and SCALE
VOLTS/DIV (provided the soft menu key „0/7“ was selected as
indicated by a blue background). If less than 8 logic channels
are to be displayed, or if the position of individual channels is
to be changed, this can be done in the short menu in conjunc-
tion with the soft menu keys and the Y POSITION and SCALE
VOLTS/DIV controls. In order to do this, push the soft menu key
next to : this will allow you to control the Y position and
the size of the logic channel display with the knobs. The name
of which will be shown above the menu entry (in this example
number 0). The selection of the channels is done with the soft
keys „Arrow Up“ and „Arrow Down“. By this method all channels
may be individually positioned and sized. If POD was activated
and if the MENU key in the Channel Control section of the front
panel was pushed, the menu for setting the trigger levels will
be shown: 5 preprogrammed levels are available, 2 of which
are user denable.
There is also a possibility to combine several digital channels
to form buses which will then be displayed on the screen in
tables. Basically two independent buses are possible, e.g. an 8
bit address and an 8 bit data bus may be combined. In order to
access the bus settings, press the REF/BUS key and then the
MENU key in the VERTICAL area of the front panel.
A menu will open, the top key allows to select B1 or B2 (the
activated one will have a blue background). The key below al-
lows to select the type of bus. For the parallel bus PARALLEL
and PARALELL + CLOCK are available. After selection of the
bus type, press the soft menu key CONFIGURATION which
will open the submenu for the bus settings. After pressing
the top menu key BUS WIDTH, the desired bus width can be
selected with the universal knob from 1 to 16 bits. The window
showing the table of bits will be dynamically adapted. Now
press the soft menu key SOURCE, the universal knob is used
to link a physical source to the bit selected. In the window,
the entry which is presently being set will be shown with a
blue background. On the left side of the table in the window,
the bus bits are shown in a xed order, at the top there is D0
which is the LSB of the bus. The universal knob is used to link
the bus bit selected to a real logic channel. Example:The bus
bit D0 is linked to logic channel D9 (this is equivalent to the
LC9 input on POD2).
There are no restrictions to the linking, it is also possible to
partly use identical logic channels in the two buses. In order to
select the individual bits in the table, use the keys PREVIOUS
Mixed Signal Operation
Fig. 11.2: Logic channels’ settings display