19
Subject to change without notice
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 read-
out, e.g. “
Y1: deflection coefficient, input coupling”.
The “ :
“ symbolizes calibrated measuring conditions
and is replaced by the “
>
“ symbol in uncalibrated
conditions.
In
DUAL, ADD
(addition) and
XY
mode both deflection
coefficients etc. are displayed. Instead of
“Y1:...”
and
“Y2:...”
the readout displays
“Y:...”
and
“X:...”
in
XY
mode.
(22) CH I
VAR.
- Pushbutton with several functions
CHI
Briefly pressing the pushbutton 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 (
“TR:Y1...”
). The last function
setting of the
VOLTS/DIV (21)
knob remains unchanged.
All channel related controls are active if
INPUT CHI
(32)
is not set to
GD (34)
.
VAR.
Pressing and holding this pushbutton selects the
VOLTS/
DIV. (21)
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 (21)
on, the deflection
coefficient is still calibrated. Turning the
VOLTS/DIV. (21)
control knob counter clockwise reduces the signal height
and the deflection coefficient becomes uncalibrated. The
readout then displays e.g. “
Y1>...
” indicating the uncali-
brated condition instead of “
Y1:...
”. Pressing and holding
the
CHI
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
CHI
pushbutton can also be pressed simultaneously
with the
DUAL(23) pushbutton
.
Please note item (23)
.
(23) DUAL
- Pushbutton with multiple functions
DUAL
Briefly pressing this pushbutton switches over to DUAL
mode. Then both deflection coefficients are displayed.
The previous trigger setting stays as it was, but can be
changed.
All controls related to both channels are active, if the
inputs
(32)
and
(36)
are not set to
GD (34) (38)
.
Whether alternated or chopped channel switching is
present in analog mode depends on the actual time base
setting, and is displayed in the readout.
ALT (analog mode only)
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 (analog mode only)
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 to 500µs/div has
been chosen.
The actual channel switching can be changed to the
opposite mode by briefly pressing both
CHI (22)
and
DUAL (23)
simultaneously. If afterwards the time coef-
ficient is changed, the channel switching is automatically
set to the time coefficient related mode.
STORAGE MODE ONLY
In DUAL storage mode the signal capture is performed
by both A/D converters. As there is no requirement to
select between ALT and CHP, the selection is switched
off. The readout then displays the current signal capture
and display mode.
ADD
(addition) mode can be selected by briefly pressing the
DUAL (23)
and
CHII (26) pushbutton
s simultaneously.
Whether the algebraic sum (addition) or the difference
(subtraction) of both input signals is displayed, depends
on the phase relationship and the
INV (34) (38)
setting(s).
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 ampli-
fiers in Yt mode”
.
In ADD mode the readout indicates a “
+
” sign located
between both channel deflection coefficients. The trigger
point symbol is switched off.
The Y -position of the signal can be influenced by both
Y-POS
controls
(14)
and
(15)
.
XY
(analog mode)
mode can be switched on or off by pressing and holding
the
DUAL pushbutton (23)
.
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
and cause the display of the voltage measurement, 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 (15)
knob and
INV (38) pushbutton
are deactivated. For X position
alteration, the
X-POS. (19)
knob can be used.
Controls and Readout
