16
Subject to change without notice
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 channel(s) are displayed in the readout,
i.e.
“Y1:...”
deflection coefficient, input coupling” (
”X:...”
in XY mode). The
“:”
symbolizes calibrated measuring
conditions and is replaced by the
“>”
symbol in uncalibrated
conditions.
(21) CH I - VAR.
- Pushbutton with several functions.
CH I
Briefly pressing the
CH I
button sets the instrument to
channel I
(Mono CH I)
mode. The deflection coefficient
displayed in the readout indicates the current conditions
(
“Y1...”
). If neither external nor line (mains) triggering
was active, the internal trigger source automatically
switches over to channel I (
TRIG.-LED (23) CH I
lits). The
last function setting of the
VOLTS/DIV (20)
knob remains
unchanged.
All channel I related controls are active if the input
(31)
is
not set to
GD (33)
.
VAR.
Pressing and holding this pushbutton selects the
VOLTS/
DIV. (20)
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 (20)
on, the deflection
coefficient is still calibrated. Turning the
VOLTS/DIV.
(20)
control knob counter clockwise reduces the signal
height and the deflection coefficient becomes
uncalibrated.
The readout then displays i.e.
“Y1>...”
indicating the
uncalibrated condition instead of
“Y1:...”
. Pressing and
holding the CH I pushbutton again switches the LED off,
sets the deflection coefficient into calibrated condition
and activates the attenuator function. The previous vernier
setting will not be stored.
The CH I pushbutton can also be pressed simultaneously
with the
DUAL (22)
button. Please note item (22).
(22) DUAL - XY
- Pushbutton with multiple functions.
DUAL mode
Briefly pressing this button switches over to
DUAL
mode. Both deflection coefficients are then displayed.
The previous trigger setting stays as it was, but can be
changed.
All controls related to both channels are active, if the
inputs
(31)
and
(35)
are not set to
GD (33) (37)
.
Whether alternated or chopped channel switching is
present depends on the actual time base setting, and is
displayed in the readout.
ALT
displayed in the readout, indicates alternate channel
switching. After each time base sweep the instrument
internally switches over from channel I to channel II and
vice versa. This channel switching mode is automatically
selected if any time coefficient from 200µs/div to 50ns/
div is active.
CHP
indicates chopper mode, whereby the channel switching
occurs constantly between channel I and II during each
sweep. This channel switching mode occurs when any
time base setting between 500ms/div and 500µs/div has
been chosen. The actual channel switching can be changed
to the opposite mode by briefly pressing both
CH I (21)
and
DUAL (22)
simultaneously. If afterwards the time
coefficient is changed, the channel switching is
automatically set to the time coefficient related mode.
STORAGE MODE ONLY
The signal acquisition is carried out with both A/D
converters in the two channel
(DUAL)
digital mode. Since
there is no need to switch channels as in analog mode,
the readout display shows the signal acquisition mode
instead of
ALT
or
CHP
.
ADD mode
Addition mode can be selected by briefly pressing the
DUAL (22)
and
CH II (25)
pushbuttons simultaneously.
Whether the algebraic sum (addition) or the difference
(subtraction) of both input signals is displayed, depends
on the phase relationship and the
INV (37)
setting. As a
result both signals are displayed as one signal.
For correct measurements the deflection coefficients for
both channels must be equal.
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
(13)
and
(14)
.
XY mode
This mode can be switched on or off by pressing and
holding the
DUAL
button
(22)
.
In XY mode the deflection coefficients are displayed as
“X...”
for channel I and
“Y...”
for channel II, followed by
“XY”
. Consequently
INPUT CH I (31)
serves as an X-
input and
INPUT CH II (35)
is used for Y-deflection. The
X-MAG x10 (19)
function is automatically switched off.
The cursor lines may be active, but the trigger point and
the 0 Volt reference symbols are switched off.
Controls and readout
