36
Subject to change without notice
22.1
Edge-/Video-Trigger
22.1.1
CH1
Conditions: Analog or DSO mode, EDGE or VIDEO selected.
CH1 will then be the trigger source, no matter whether it is
displayed or not. Readout: ”Tr:CH1, (Slope), Filter (TV)“.
22.1.2
CH2
Conditions: Analog or DSO mode, EDGE or VIDEO selected.
CH2 will then be the trigger source, no matter whether it is
displayed or not. Readout: ”Tr:CH2, (Slope), Filter (TV).“
22.1.3
Alt. 1/2
Conditions: Analog mode, EDGE-Triggering.
Alternate triggering with the signals from channels 1 and 2 as
described in the section ”Alternate Trigger“ of chapter ”Triggering
and time bases“. Please note that in this trigger mode the appa-
rent time relationships between the two signals on the screen are
meaningless and misleading, the relative position of the two signals
depends only on their shape and the trigger level selected.
In dual channel mode (DUAL) alternate triggering is only pos-
sible in conjunction with alternate dual channel operation. If
previously dual trace chopped mode was selected (VERT/XY
pushbutton)
>
DUAL chop) it will be automatically changed to
alternate mode when alternate triggering is selected. After ”Alt.
1/2“ is turned off dual trace chopped mode may be selected
again. Readout: ”Tr:alt, Slope, Filter“.
22.1.4
External
In this mode the trigger signal comes from AUXILIARY INPUT
). Readout: ”Tr:alt, Slope, Filter“.
22.1.5
AC Line
The trigger signal is taken from the line which feeds the scope.
See also the section ”Line triggering“ in the chapter ”Triggering
and time bases“. Readout: ”Tr:alt, Line, Slope“.
TRIG’d display
(not in XY mode)
This LED will light up if the time base receives a trigger signal.
It depends upon the trigger signal whether the LED will just
blink or remain illuminated.
NORM display
This display will light up provided ”Auto“ triggering was not
selected. The mode can be selected in the ”Trigger“ menu called
by pressing (MODE
). The light points out that the screen will
remain dark as long as there is no suffi cient trigger signal.
C o n t r o l s a n d R e a d o u t
HOLD-OFF display
(Analog mode only)
This display will light up if the hold-off time was set to
>
0% in
order to indicate that the longer than minimum hold-off time
may cause a lower rep rate of the time base and thus a darker
display. Setting the hold-off time requires pressing the HOR
pushbutton
which calls the menu ”Time base“. Only the time
base A hold-off time may be changed.
See the section ”Hold-off time setting“ in the chapter ”Triggering
and time bases“.
X-POS DELAY pushbutton
This pushbutton allows to change the function of the
HORIZONTAL
knob .
26.1
Analog mode
The pushbutton signals the actually selected function in accor-
dance with the front panel lettering:
dark:
X position control
green:
Delay time control
26.1.1
X-POS
If the pushbutton is dark the HORIZONTAL-knob
functions
as X position control, i.e. it moves the signal display horizon-
tally.
The position control is especially useful when the magnifi er
(MAG. x 10
) is switched on. The magnifi er will magnify the
display 10 times around the screen centre, with the control the
portion of the signal to be studied can be shifted on-screen.
26.1.2
DELAY
In order to change the function of the HORIZONTAL-knob
to
DELAY proceed as follows:
Press the HOR
pushbutton which will present the TIME BASE
menu, select SEARCH or B ONLY, then the function of the knob
will be changed if the pushbutton is depressed. It will light up
to show that the knob is now the delay time control.
In SEARCH mode both traces (time base A and B) alternate.
Unlike the former time base A ONLY mode, a sector with high-
er intensity is visible on the A trace. This sector can be moved
continuously by the delay time control. The time between the
A trace start and the beginning of the intensifi ed sector is the
delay time. This information is also displayed in the readout (”Dt:
…“) and is an aid to fi nd the position of the intensifi ed sector
which may be very small. If time base B ONLY is chosen the
VOLTS / DIV
SCALE
·
VAR
VOLTS / DIV
SCALE
·
VAR
TIME / DIV
SCALE
·
VAR
AUTO/
CURSOR
MEASURE
20 V
1 mV
20 V
1 mV
X-POS
LEVEL A/B
50s
5ns
AUX
HORIZONTAL
DELAY
CH 1/2
CURSOR
MA/REF
ZOOM
MODE
FILTER
SOURCE
TRIG
’
d
NORM
HOLD OFF
TRIGGER
POSITION 1
POSITION 2
CH 1
VERT/XY
CH 2
HOR
MAG
VAR
VAR
VAR
x10
POWER
20
16
19
26
29
18
15
27
23
25
21
28
24
22
30
17
14
13
