29
Subject to change without notice
17.2.2
Norm
The pushbutton allows the selection of the US standard of 525
lines and 60 Hz (NTSC) or the European standard with 625 lines
and 50 Hz (PAL). With any change of standard the line number
will be automatically changed, too.
17.2.3
Polarity
Composite video signals may have both polarities. Selection of
the right polarity is vital as the scope should be triggered by the
sync pulses and not the video content.
Positive polarity is defi ned by the video content being more
positive than the sync signals and vice versa.
If the polarity was wrongly selected there will be no triggering
at all, an untriggered display or no signal capture.
18
SOURCE
(pushbutton)
Depressing this pushbutton will call various menus depending
on the previously selected mode (MODE
16
pushbutton): Edge
and Video. In XY mode the pushbuttons: MODE
16
, FILTER
17
,
SOURCE
18
are disabled as XY displays can not be triggered.
18.1
Edge-/Video-Trigger
In the ”Trigger SOURCE“ menu the source is selected from
which the trigger signal is to be taken. The options depend on
the actual mode of the scope.
18.1.1
CH1
Conditions: 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)“.
18.1.2
CH2
Conditions: 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).“
18.1.3
Alt. 1/2
Conditions: EDGE-Triggering. Alternate triggering with the
signals from channels 1 and 2 as described in the section ”Al-
ternate Trigger“ of chapter ”Triggering and time bases“. Please
note that in this trigger mode the apparent 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
28
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 selec-
ted again.
Readout: ”Tr:alt, Slope, Filter“.
18.1.4
External
In this mode the trigger signal comes from AUXILIARY INPUT
33
). Readout: ”Tr:ext, Slope, Filter“.
18.1.5
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“.
19
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.
20
NORM display
This display will light up provided ”Auto“ triggering was not
selected. The mode can be selected in the ”Trigger“ menu called
HM 1
0
0
0-2 - KLB - Stand: 07/1
2/06 gw
HM1
0
0
0 - blau - Stand: 07/1
2/06 gw
HM
10
0
0
-2
- gr
ü
n -
St
an
d
:
07/1
2/06
gw
VAR
VAR
VAR
x10
FOCUS
TRACE
VOLTS / DIV
VAR
VOLTS / DIV
VAR
TIME / DIV
VAR
X-POS
INTENS
!
LEVEL A/B
MENU
AUX
AUXILIARY INPUT
HORIZONTAL
INPUTS
1M
Ω
II15pF
max
400 Vp
CAT I
!
CAT I
!
DELAY
TRACE
SEP
CH 1/2
CURSOR
SAVE/
RECALL
AUTOSET
SETTINGS
HELP
POSITION 1
POSITION 2
VERT/XY
HM1500-2
ANALOG
OSCILLOSCOPE
150 MHz
TRIGGER
MODE
FILTER
SOURCE
TRIG
’
d
NORM
HOLD OFF
AUTO
MEASURE
CURSOR
MEASURE
TRIG. EXT. / Z-INP.
CH 1
CH 2
X-INP
CH 1
CH 2
HOR
MAG
1M
Ω
II
15pF
max
100 Vp
20 V
1 mV
20 V
1 mV
0.5s
50ns
POWER
POWER
MENU
MENU
OFF
OFF
1
2
3
4
5
8
7
6
9
10
11
13
12
14
15
22
23
16
17
24
18
21
25
26
19
20
27
30
28
29
31
32
33
37
C o n t r o l s a n d R e a d o u t
