Instruction manual

Subject to change without notice
20
STORAGE MODE ONLY
In XY storage mode the readout indicates “XY” and
the RFR LED (9) is lit. No other STOR. MODE can be
chosen. Instead of the time deflection coefficient, the
readout displays the sampling rate (e.g. “100MS/s”)
which can be selected by the TIME/DIV. knob (29).
In contrast to analog mode, the INV. (38) pushbutton is
active and the X signal can be inverted. Also the Y-POS.
II (15) knob must be used for X position shift instead of
the X-POS. (19) control. If HOLD is active, the current
XY signal can be moved in X (Y-POS. II) and Y (Y-POS.
I) direction.
(24) TRIG.
ALT- Pushbutton with double function and associated
LEDs.
The pushbutton and the LEDs are deactivated in XY
mode and if line (mains) triggering is selected.
TRIG.
With the aid of this pushbutton, 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. (39) 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) and the readout.
Briefly pressing the pushbutton switches over in the
following sequence:
I - II - EXT - I in DUAL 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 pushbutton selects alternate
triggering in DUAL mode. Under these conditions both I
and II LEDs lite and the readout displays “TR:ALT..”. As
alternate triggering requires alternate channel operation
in analog mode, alternate channel switching is set
automatically. A change of the time base 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” if analog mode is present.
In alternate trigger mode the trigger point symbol is
switched off. TVL, TVF trigger coupling and line (
~)
triggering can not be selected.
Alternate triggering is not available or automatically
switched off under the following conditions:
SINGLE (SGL) mode
ADD (addition) mode,
alternate (A & B) time base mode,
B time base mode and
line (mains) trigger coupling.
STORAGE MODE ONLY
In ROLL mode the signal capture is untriggered. Con-
sequently alternate triggering is not available.
(25) VOLTS/DIV. – Control knob
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 in a 1-2-5 sequence and decreases it 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, i.e. “Y2: deflection coefficient, input coup-
ling”. The “ : “ symbolizes calibrated measuring condi-
tions 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.
(26) CH II
VAR. - Pushbutton with several functions.
Channel mode
Briefly pressing the pushbutton 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 (main) triggering
was active, the internal trigger source automatically
switches over to channel II (“TR:Y2...“). The last function
setting of the VOLTS/DIV (25) knob remains unchanged.
All channel related controls are active if INPUT CHII (36)
is not set to GD (38).
VAR.
Pressing and holding this pushbutton selects the VOLTS/
DIV. (25) 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 (25) on, the deflection
coefficient is still calibrated. Turning the VOLTS/DIV. (25)
control knob counter clockwise reduces the signal height
and the deflection coefficient becomes uncalibrated. The
readout then displays i.e. “Y2>...” indicating the
uncalibrated 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 setting will not be stored.
The CHII pushbutton can also be pressed simultaneously
with the DUAL (23) pushbutton. Please note item (23).
Controls and Readout
A