28
Subject to change without notice
7.2.5
Edit
>
Constant Edit
In the CW position of the INTENS knob
an additional item
”Edit“ and an arrow symbol is displayed. Pressing the associated
function button opens the sub submenu ”Constant Edit“. This
enables to choose a Number, its ”Dec.Point“ (decimal point) and
its ”Prefi x“ of the ”Unit“, all with the INTENS knob
. The unit
need not be selected it is only shown to assist the memory.
7.3
Display
STOP
Attention!
The display of mathematic signal(s) automatically
switches previously displayed reference signals off
and vice versa.
The function ”Display“ is available twice in the menu and may
be switched on or off in any combination. This allows to display:
no result, one result, the result of two equations as signals. The
displays will come forward upon leaving the ”Mathematics“
menu. Also the designation of the equation (e.g. MA2) will be
shown. Select the equations to be displayed with the INTENS
knob
.
The mathematics signal is automatically scaled, this is inde-
pendent of the graticule, of Y and time base parameters, the
scale will not be shown. Hence the measurement of the signal
amplitudes must be performed using the CURSOR (V to GND)
after the ”reference“ (e.g. MA2) of the CURSOR to the ”mathe-
matics signal“ and its scale was established (AUTO/CURSOR
MEASURE
pushbutton
>
Cursors
>
reference
>
e.g. MA2).
The readout may then display e.g.: ”V(MA2): 900 mV“.
Divisions by zero will be ignored and an error message dis-
played.
7.4 Units
Each function ”Display“ will be associated with a function ”Unit“
which can be selected with INTENS
and will be attached to
the result.
ACQUIRE
Available only in DSO mode.
This pushbutton opens the menu ACQUIRE which offers these
modes:
8.1 Refresh capture/display.
In this mode repetitive signals may be captured and displayed
much like in analog mode. The readout will show ”rfr“. Signal
acquisition may be stopped or started with the RUN/STOP push-
button. The STOP pushbutton will be illuminated in stop.
A trigger will start a new acquisition which will overwrite the
display of the former. The display will remain on screen until
the next acquisition. This mode is available over the full time
base range (50 s/cm to 5 ns/cm).
STOP
Please note:
After changing the time base acquisition and display
will always start fi rst at the trigger position which is
undelayed (Readout: ”Tt:0s“) on the screen centre.
With the 2
nd
acquisition the display will start at the
screen left. In most cases this is meaningless, but
the scope may seem not to react at slow time base
settings combined with long Posttrigger times.
In the utmost left position of the trigger point selec-
ted with the HORIZONTAL control
the readout
will indicate ”Tt:1.85ks“ for a time base setting of
50 s/cm. This means that 1,600 seconds must elap-
se until the trace will become visible at the screen
left, after another 250 s it will have reached the
screen centre (1,600 s + 250 s = 1.85 ks).
8.2 Envelope capture/display
Envelope is a special mode in refresh mode, the readout will
show ”env“. Also in this mode there must be suffi cient signal
for triggering.
In contrast to the refresh mode the results of several captures
will be examined and the maxima and minima stored, the enve-
lope of the signal will then be displayed if it changes in amplitude
or/and frequency. Also any jitter will be shown.
Also in this mode pressing RUN/STOP
will stop the acquisi-
tion, indicated by STOP illuminated. After pressing the pushbut-
ton again the formerly stored signals will be erased and the en-
velope calculation starts anew. In order to prevent an accidental
turning on of this mode operating any control which infl uences
the signal display will automatically switch envelope off.
Because this mode requires many signal repetitions and acqui-
sitions it is not compatible with single sweep/acquisition. AUTO
or normal trigger modes must be selected.
8.3 Average mode capture/display
Also this is a special mode within the refresh mode. Also here
signal repetitions are needed.
The weighting of each acquisition can be selected with ”Ave-
rage“ in the menu, any number between 2 and 512 may be
chosen using the INTENS knob
. The readout will show e.g.
”avg#512“.
The higher the number of acquisitions averaged the lower the
contribution of a single acquisition will be and the longer the
averaging will take. Averaging is a means to increase the ac-
curacy inspite of the 8 bit converters, it is an exchange of time
against accuracy. Noise will be reduced by averaging.
The same holds as for envelope: the acquisition may be stopped
by pressing the RUN/STOP pushbutton, STOP will be illumina-
ted. Pressing RUN/STOP again will restart. In order to prevent
C o n t r o l s a n d R e a d o u t
EXIT MENU
INTENS
!
HM1008
ANALOG
DIGITAL
OSCILLOSCOPE
1 GSa
·
1 MB
100 MHz
DIGITAL
ANALOG
FOCUS
TRACE
MENU
REMOTE OFF
MATH
SAVE/
RECALL
AUTOSET
RUN
ACQUIRE
SETTINGS
HELP
STOP
REM
POWER
POWER
1
2
3
4
5
6
7
8
9
10
11
12
