17
Subject to change without notice
ANALOG MODE ONLY
All trigger and time base related controls as well as the
Y-
POS. I (13)
knob are deactivated. For X position alteration,
the
X-POS. (18)
knob can be used.
STORAGE MODE ONLY
XY mode is indicated by the readout display
”XY”
and the
RFR-LED
is lit. No other
STOR. MODE (9)
can be chosen.
The readout displays the sampling rate (e.g. ”40MS/s”)
which can be selected by the
TIME/DIV. (28)
knob.
There are gaps in the display of Lissajous figures when
the sampling rate is too high. Too low a sampling rate can
result in a display which does not permit the frequency
ratio of the two signals to be determined. The selection
of a suitable sampling rate is simplified if both the signals
are first displayed in the refresh DUAL mode. The
TIME/
DIV
control should be then so set that at least one period
of each signal is displayed. After this one can switch to the
XY Digital mode.
Attention!
Note the following differences compared to the analog
XY mode:
The Y POS. I (13) control functions as X-Position control
and the X-POS (18) control is disabled.
(23) 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. In the
latter case this also applies to all trigger related controls
and LEDs.
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 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. The trigger
point symbol is switched off in external trigger condition.
STORAGE MODE ONLY
In combination with ROLL mode, all controls and LEDs
regarding trigger functions are disabled.
ALT:
Pressing and holding the button selects alternate triggering
in DUAL mode. Under these conditions both
TRIG CH
I
and
CH 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,
TVL
,
TVF
and line (mains) trigger coupling and the time
base modes which are available only in analog mode
(
search (SEA)
,
delayed
(
DEL
and
DTR
)).
(24) VOLTS/DIV.
- Control knob and associated LED.
This control knob for channel II has a double function. The
following description relates to the input attenuator
function (VAR-LED dark).
This control knob is operative in those modes where
channel II is active (
CH II
,
DUAL
,
ADD
and
XY
) and the
input coupling is not set to ground (
GD (37)
).
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.
“Y2:...”
deflection coefficient, input coupling” (
”Y:...”
in
XY mode). The
“:”
symbolizes calibrated measuring
conditions and is replaced by the
“>”
symbol in uncalibrated
conditions.
(25) CH II - VAR.
- Pushbutton with several functions.
CH II
Briefly pressing the CH I button sets the instrument to
channel II (Mono CH I) 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 (23) CH I
lits). The
last function setting of the
VOLTS/DIV (24)
knob remains
unchanged.
All channel I related controls are active if the input
(35)
is
not set to
GD (37)
.
VAR.
Pressing and holding this pushbutton selects the
VOLTS/
DIV. (24)
control knob function between attenuator and
Controls and readout
