Subject to change without notice
14
Controls and Readout
(14) X-MAG. x10
- Pushbutton and LED.
Each time this pushbutton is pressed the
x10
LED located
above is switched on or off. If the x10 LED is lit, the
signal display in all Yt (time base) modes is expanded 10
fold and consequently only a tenth part of the signal curve
is visible. The interesting part of the signal can be made
visible with aid of the
X-POS. (13)
control. As the X
expansion results in a higher time base speed (lower time
deflection coefficient), all time and frequency relevant
information in the readout is switched over.
Please note!
The expansion is 5 fold if the time base is set to 50ns/
div. Consequently the lowest time deflection coeffi-
cient is 10ns/div.
This pushbutton is not operative in XY mode.
(15) VOLTS/DIV.
This control knob for channel I 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 (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, e.g.
”Y1: deflection coefficient, input coup-
ling”
. The ”
:”
symbolizes calibrated measuring conditions
and is replaced by the
”>”
symbol in uncalibrated con-
ditions.
(16) CH I - VAR.
- Pushbutton with several functions.
CH I mode:
Briefly pressing the CHI 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 (18) CHI
lits).
The last function setting of the
VOLTS/DIV (15)
knob
remains unchanged.
All channel I related controls are active if the
input (26)
is not set to
GD (28)
.
VAR.:
Pressing and holding this pushbutton selects the
VOLTS/
DIV. (15)
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 (15)
on, the deflection
coefficient is still calibrated. Turning the
VOLTS/DIV. (15)
control knob counter clockwise reduces the signal height
and the deflection coefficient becomes uncalibrated.
The readout then displays e.g.
”Y1>...”
indicating the
uncalibrated 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(17)
button. Please note item (17).
(17) 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 (26)
and
(30)
are not set to
GD (28) (32)
.
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
CHI (16)
and
DUAL (17)
simultaneously. If afterwards the time
coefficient 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 (17)
and
CHII (20)
buttons
simultaneously
.
Whether the algebraic sum (addition) or the difference
(subtraction) of both input signals is displayed, depends
on the phase relationship and the
INV (32)
setting. As a
result both signals are displayed as one signal. For correct
measurements the deflection coefficients for both
channels must be equal.
