15
Subject to change without notice
Controls and Readout
Please note ”Operating modes of the vertical amplifiers
in Yt mode”.
The readout indicates this mode by a
”+”
sign located
between both channel deflection coefficients. While the
trigger mode is not affected, the trigger point symbol is
switched off.
The Y-position of the signal can be influenced by both
Y-
POS
controls
(8)
and
(9)
.
XY mode:
This mode can be switched on or off by
pressing and
holding
the
DUAL
button
(17)
.
In
XY
mode the deflection coefficients are displayed as
”
Y...”
for channel I and
”X...”
for channel II, followed by
”
XY”
. Except the cursor lines which may be active, all
other readout information including the trigger point
symbol are switched off. In addition to all trigger and
time base related controls, the
Y-POS. II (9)
knob and
INV
(32)
button are deactivated. For X position alteration,
the
X-POS. (13)
knob can be used.
(18) TRIG
.
Pushbutton with double function for trigger source
selection and associated LEDs.
The button and the LEDs are deactivated if line (mains)
triggering is selected or XY operation is chosen.
With the aid of this button, the trigger source can be
chosen. There are three trigger sources available:
channel I
,
channel II
(both designated as internal trigger
sources) and the
TRIG. EXT. (33)
input for external trig-
gering.
The availability of the internal sources depends on the
actual channel mode. The actual setting is indicated by
the associated LED(s).
Briefly pressing the button switches over in the following
sequence:
I - II - EXT - I
in
DUAL
and
ADD
(addition) mode,
I - EXT - I
if
mono channel I
is present,
II - EXT - II
under
mono channel II
conditions.
Each condition is indicated by the associated LED. The
trigger point symbol is switched off in external trigger
condition.
ALT:
Pressing and holding the button selects
alternate
triggering
in DUAL mode. Under these conditions both
I and II LEDs are lit. As alternate triggering requires
alternate channel operation, alternate channel switching
is set automatically. A change of the time coefficient then
has no affect regarding the channel switching mode. In
addition to the deflection coefficients display
, ”ALT”
is
displayed by the readout instead of
”CHP”
.
In alternate trigger mode the trigger point symbol is
switched off.
Alternate triggering is not available or automatically
switched off under the following conditions:
ADD
(addition) mode,
search (
SEA
),
delayed (
DEL
and
DTR
) time base mode,
TVL
,
TVF
and
line
(mains) trigger coupling.
(19) VOLTS/DIV
.
This control knob for channel II has a double function.
The following description relates to the input attenuator
function (
VAR
LED dark).
Turning the control knob clockwise increases the
sensitivity (decreases the deflection coefficient) in a 1-2-
5 sequence and decreases the sensitivity (increases the
deflection coefficient) if turned in the opposite direction
(ccw.). The available range is from 1mV/div up to 20V/
div. The knob is automatically switched inactive if the
channel related to it is switched off, or if the input coupling
is set to GD (ground).
The deflection coefficients and additional information
regarding the active channels are displayed in the readout,
e.g.
”Y2: deflection coefficient, input coupling”
. The
”:”
symbolizes calibrated measuring conditions and is
replaced by the
”>”
symbol in uncalibrated conditions.
(20) CH II - VAR.
- Pushbutton with several functions.
CH II mode:
Briefly pressing the button sets the instrument to
channel II
(
Mono CH II
) mode. The deflection coefficient
displayed in the readout indicates the current conditions
(
”Y2...”
). If neither external nor line (mains) triggering
was active, the internal trigger source automatically
switches over to
channel II (TRIG.-LED (18) CHII
lits).
The last function setting of the
VOLTS/DIV (19)
knob
remains unchanged.
All channel related controls are active if the
input (30)
is
not set to
GD (32)
.
VAR.:
Pressing and holding this pushbutton selects the
VOLTS/
DIV. (19)
control knob function between attenuator and
vernier (variable). The current setting is displayed by the
VAR-LED
located above the knob.
After switching the
VAR
-LED
(19) on
, the deflection
coefficient is still calibrated. Turning the
VOLTS/DIV. (19)
control knob counter clockwise reduces the signal height
and the deflection coefficient becomes uncalibrated.
The readout then displays
”Y2>...”
indicating the uncali-
brated condition instead of
”Y2:...”
. Pressing and holding
the CHII pushbutton again switches the LED off, sets
the deflection coefficient into calibrated condition and
activates the attenuator function. The previous vernier
