15
Subject to change without notice
Controls and Readout
Both deflection coefficients are then displayed. The pre-
vious trigger setting stays as it was, but can be changed.
All controls related to both channels are active, if the
inputs
(27)
and
(31)
are not set to
GD (29) (33)
.
Whether alternated or chopped channel switching is
present depends on the actual timebase setting, and is
displayed in the readout.
ALT
displayed in the readout, indicates alternate channel
switching. After each timebase 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
timebase 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
CHI (17)
and
DUAL (18)
simultaneously. If afterwards the time coef-
ficient is changed, the channel switching is automatically
set to the time coefficient related mode.
ADD mode:
Addition mode can be selected by briefly pressing the
DUAL (18)
and
CHII (21)
buttons simultaneously. Whether
the algebraic sum (addition) or the difference (subtrac-
tion) of both input signals is displayed, depends on the
phase relationship and the
INV (29) (33)
setting(s). As a
result both signals are displayed as one signal. For correct
measurements the deflection coefficients for both chan-
nels 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 influ-
enced by both
Y-POS
controls
(9)
and
(10)
.
XY mode:
This mode can be switched on or off by pressing and
holding the
DUAL
button
(18)
.
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
timebase related controls, the
Y-POS. II (10)
knob and
INV (33)
button are deactivated. For X position alteration,
the
X-POS. (14)
knob can be used.
(19)TRIG.
Pushbutton with double function for trigger source selec-
tion 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. (34)
input for external
triggering.
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 and
displayed by the readout (
“TR:Y1...”, “TR:Y2...”
and
“TR:EXT...”
). The trigger point symbol is switched off in
external trigger condition.
ALT:
Pressing and holding the button selects alternate trigger-
ing in
DUAL
mode. Under these conditions both I and II
LEDs are lit and the readout displays
“TR:ALT...”
. 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,
alternate
(A & B) timebase mode,
B
timebase mode,
TVL, TVF
and
line
(mains) trigger coupling.
(20) 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 sensi-
tivity in a 1-2-5 sequence and decreases it if turned in the
opposite direction (ccw.). The available range is from
