41
Subject to change without notice
speed will be increased by a factor of 10, hence the time base
B display will be expanded 10 fold in X direction.
29.3 ”B only“
The time defl ection coeffi cient reduces by factor 10 causing a
tenfold X magnifi cation (signal expansion).
30
HOR
/
VAR
(pushbutton)
This pushbutton will open the ”Time base“ menu the contents
of which depend on the operating mode selected.
30.1 Analog mode
The following modes are available:
30.1.1
A only
In this setting only time base A is active and thus in the top left
position the readout displays only “A....“. The TIME/DIV-SCA-
LE-VAR knob
28
only effects time base A. By aid of the MAG
x10 pushbutton
29
the signal display can be expanded 10 fold;
reducing the time defl ection coeffi cient by factor 10.
If the mode is changed from time base A to ”Search“ or ”B only“
all settings of time base A remain intact including triggering.
30.1.2
Search
This mode implies alternate time base operation. The readout
will show the speeds of both time bases (”A...“ and ”B...“). The
TIME/DIV-SCALE-VAR knob will set the time base B speed.
In alternate time base mode part of the time base A display will
be intensified. The horizontal position of the intensified portion
may be shifted using the knob HORIZONTAL
27
, provided its
function was set to ”Delay“, this is the case if the pushbutton
X-POS DELAY
26
is illuminated. The length of the intensified
sector is determined by the speed of time base B and is equal
to the run time of B. Hence this intensified portion of A will be
spread over the full screen as displayed by B and thus expanded.
The Y position of the signal is the same when displayed with
either A or B. This means, however, that both displays will be
written over each other.
This can be avoided by changing the time base B trace position in
the following way: Press the CH1/2–CURSOR–MA/REF–ZOOM-
Taste
15
to call the “Pos./Scale“ menu. Then press the function
key “TB B“ so that – depending on the channel mode - the PO-
SITION 1 and /or POSITION 2 knob(s)
13
14
become(s) the trace
separation control(s) (see 13.1.5 Y Position - 2
nd
time base). As
there is only a need for trace separation in “Search mode“ this
function is only offered in this time base mode.
Also in ”Search“ the 10 x magnifier is available by pressing the
pushbutton MAG x10
29
. The magnifier will affect solely time
base B.
30.1.3
”B only“
In this mode only time base B will be displayed. Thus the readout
only displays in the top left position only “B“. The TIME/DIV-SCA-
LE-VAR knob then only affects time base B. By aid of the MAG
x10 pushbutton
29
the signal display can be expanded 10 fold;
reducing the time defl ection coeffi cient by factor 10.
30.1.4
B trigger –
Edge
In this mode time base B will not start immediately after the set
delay time has elapsed, but will be only set ready, waiting for a
signal trigger. This has the advantage that any jitter is removed,
but the delay time adjustment will now only have the effect that
the time base B display will jump from signal period to period
if several periods are displayed. In this setting a positive slope
will trigger.
The (trigger) LEVEL A/B
19
knob will set the trigger level for B.
Only normal triggering and DC coupling are possible. All para-
meters of time base A remain stored and preserved. (LEVEL,
auto or normal, Slope, coupling). In addition to the delay time
(”Dt:...“) also the B trigger parameters are shown in the readout:
”BTr:slope, DC“. In ”Search“ mode the trigger point symbol will
be preceded by ”B“. As mentioned changing the delay time will
not cause a continuous move of the intensified portion of the
time base A display and the time base B display, but jumps from
signal period to period.
If the trigger level symbol of time base B is shifted outside the
signal representation by time base A there will be no triggering
of time base B any more and thus no time base B display. The
same holds in time base B only mode.
30.1.5
B trigger –
Edge
Except for the negative edge the function is identical to the one
described above (30.1.4).
30.1.6
B trigger – OFF
Time base B will be started upon the end of the delay time set.
The delay time can be changed continuously in this mode which
can be seen as the intensified sector of the time base A display.
The disadvantage here is that with very long delay times, jitter
of the time base B display may occur. As time base B is not
operated in the signal triggered mode, the controls for time
base B trigger will be disabled.
30.1.7
A variable – On Off
If ”On“ was selected the TIME/DIV-SCALE-VAR knob
28
will
function as variable control for the time base A speed. Only
in time base A only mode will this option be available in the
menu.
For a full description see ”28.1.3 Variable“.
30.1.8
B variable – On Off
If ”On“ was selected the TIME/DIV-SCALE-VAR knob
28
will
C o n t r o l s a n d R e a d o u t
VAR
VAR
VAR
x10
AUXILIARY INPUT
LC
0 ... LC3
LOGIC PROBE
Use recommended
probe only!
TRIG. EXT. / Z-INP.
LC/AUX
FFT
1M
Ω
II
15pF
max
100 Vp
INPUTS
1M
Ω
II15pF
max
250 Vp
X-INP
CH 1
VERT/XY
CH 2
HOR
MAG
CAT I
!
50
Ω
≤
5V RMS
50
Ω
≤
5V RMS
CH 1
CH 2
!
PROBE
ADJ
00
POWER
MENU
MENU
OFF
OFF
44
31
34
32
33
35
36
38
37
39
29
30
