29
Subject to change without notice
9.1 Analog and DSO modes
Under ”Save/Recall“ the current instrument settings may be
saved or settings saved earlier recalled. There are 9 nonvolatile
memories available.
9.1.1
Saving the actual settings
Upon pressing the pushbutton the submenu ”Front Panel
Save“ will be accessed. A memory number will be offered
(1 to 9) which can be changed by the INTENS knob
. By pres-
sing ”Save“ all settings will be saved in the memory location
the number of which was selected.
9.1.2
Recall the actual settings
In the submenu ”Front Panel Recall“ a memory number will
be displayed (1 to 9) which can be changed with the INTENS
knob
. Pressing the pushbutton ”Recall“ causes loading of
the settings stored.
9.2
DSO mode
The menu options described in 9.1.1 and 9.1.2 are also available
in DSO mode. Additionally, the menu options ”Reference Save“
and ”Reference Display“ will be available. A reference is a signal
which was resp. can be stored away for later reference to it 9
nonvolatile memory locations are provided.
9.2.1
Reference Save
9.2.1.1
Source x
In the submenu the source can be selected with the INTENS
knob
. Signals from the logic inputs CH3 and CH4 can not be
stored as references.
9.2.1.2
Destination RE x
There are 9 memory locations available into which reference
signals from the source selected before can be stored. Use the
INTENS knob
for selection.
9.2.1.3
Save
Pressing ”Save“ will store the signal from the source selected
into the memory selected.
9.2.2
Reference Display
STOP
Attention!
The display of reference signals automatically swit-
ches previously displayed mathematic signal(s) off
and vice versa.
9.2.2.1
RE x, On Off, associated settings
When in this submenu using the INTENS knob will allow
selection of 2 reference signals which can then be displayed
alongside with 2 input signals.
9.2.2.2
RE x
After calling this function the memory location can be selected
with the INTENS knob
. (RE 1 to 9)
9.2.2.3
On Off
With the pushbutton on/off control is possible. When the
contents of the reference memory are displayed, the memory
number is indicated with RE x (x = 1 to 9) at the right hand
screen side. Switching to ”on“ will produce another menu item
(”Assoc.Set“).
STOP
Please note:
If both reference displays are ”on“ and if both
memory locations are identical (e.g. RE1, RE1) the
signal will be displayed twice on the same spot.
an inadvertent entering of this mode the operation of any control
will automatically cause this mode to be reset.
As repetitive acquisitions are needed for calculation of an ave-
rage single sweep will not be compatible.
8.4 Roll mode capture/display
Roll mode means that the signal(s) will be continuously acquired
without the need for a trigger. Hence all controls, displays and
readouts for the trigger and ZOOM will be disabled. The readout
will show ”rol“.
The result of the last acquisition will be displayed at the right
hand edge of the graticule, all formerly acquired signals will
be shifted one address to the left. The result at the left hand
screen edge will be dropped. There is no waiting for a trigger
and thus the hold-off time is minimum. As in any other mode
the signal acquisition may be stopped and restarted any time
with the RUN/STOP pushbutton.
In roll mode the time base available is limited to 50 s/cm to
50 ms/cm. Faster time bases do not make sense as the signal
could not be observed any more.
In case the time base was set outside the limit cited it will be
automatically changed to the next value within the limits upon
entering this mode.
8.5 Peak Detect Auto Off
On Peak Detect Auto mode this mode of acquisition will be au-
tomatically selected if YT and time base speeds of 20 ms/cm to
2 ms/cm were chosen. This mode is only available with: Refresh,
Envelope, Average, and Single sweep. The readout will show PD
preceding the symbol for the operating mode selected.
At slow sweep speeds the sampling rate will be low, i.e. there
are relatively large gaps between samples. Glitches occurring
during those gaps will go by unnoticed. With Peak Detect, how-
ever, the highest sampling rate will be used such that glitches
will be caught. The samples will be looked at and the ones with
the highest values stored and displayed.
8.6 Random Auto Off
Provided single sweep was not selected Random Sampling will
be automatically selected beginning at a certain sweep speed.
The time base setting will be indicated in the readout, e.g. ”RS:
10 GSa“ (= Random sampling with 10 GS/s effective sampling
rate), the real time time base speed will be 5 ns/cm. Without
Random Sampling ”RS“ Real Time Sampling will be used with
a maximum sampling rate of 1 GS/s (one channel only) or
500 kSa/s (two channel mode).
Random Sampling requires repetitive signals, each signal peri-
od will contribute one sample. At an effective sampling rate of
10 GS/s the time difference from sample to sample along the
signal period will be 0.1 ns. However, note that with random
sampling the samples are not taken in sequence along the sig-
nal period but randomly with respect to it. Random Sampling
allows to generate the 200 points per cm in X direction at the
fastest time base of 5 ns/cm.
Remark:
5 ns/cm are also available in other modes. In Real
Time Sampling mode and 1 GS/s on one channel each 1 ns a
sample is taken, hence at 5 ns/cm there are 5 points per cm.
The ”missing“ 195 points are generated by interpolation using
sin x/x.
SAVE/RECALL
This pushbutton will open up a menu. The number of choices
in this menu is dependent upon whether there is analog or
DSO mode.
C o n t r o l s a n d R e a d o u t
