14
Subject to change without notice
Controls and readout
Y POS:
The
vertical trace position
of channel II can be set with
this control knob, if the CURSOR POS LED isn’t lit. In
addition (“add”) mode both
(
Y POS/CURS. I (6)
and
Y
POS/CURS. II
) control knobs are active. If the instrument
is set to XY
XY
XY
XY
XY mode, this control knob is inactive
inactive
inactive
inactive
inactive and the X
X
X
X
X
POS. (12)
POS. (12)
POS. (12)
POS. (12)
POS. (12) knob must be used for horizontal positioning.
DC voltage measurement:
If no signal is applied at the
INPUT CHII (28)
, the vertical
trace position represents 0 Volt. This is the case if
INPUT
CHII (28)
or in addition
(ADD)
mode, both
INPUT CHI (25)
and
INPUT CHII
(28)
, are set to
GND
(ground) (26) (29) and
automatic triggering
(AT (9))
is present to make the trace
visible.
The trace can then be set to the vertical position best
suited for the following
DC
voltage measurement. After
switching
GND
(ground) off and selecting
DC
input
coupling, a
DC
signal applied at the input changes the
trace position in vertical direction. The DC
DC
DC
DC
DC voltage then
can be determined by taking the deflection coefficient,
the probe factor and the trace position change with respect
to the previous 0 Volt position into account.
”0 Volt” Symbol:
The READOUT indicates the “0 Volt” trace position of
channel II by a
”
⊥
⊥⊥
⊥⊥
” symbol to the right of the screen‘s
vertical center line in
CHII
and
DUAL
mode. When Y position
is used, this symbol changes to an “arrow” symbol
pointing outside the graticule just before the trace goes
outside the graticule limits
If addition mode (“add”) is present just one ”
⊥
”
symbol is
visible.
In XY mode the “0 Volt” trace position for channel I (X) and
channel II (Y) is symbolised by “triangle” symbols at the
right graticule border (Y) and above the Y deflection
coefficient display. The “triangle” symbol(s) point(s)
outside the graticule when the “0 Volt” trace position is
outside the graticule.
CURS.II:
If the CUR (7) LED is lit, the CURSOR line(s) marked with
the symbol “II” can be shifted by the
Y-POS/CURS. II
(8)
control knob.
STORAGE MODE ONLY
The Y-POS/CURS.II (8) knob can also be used for shifting a
signal position although it is stored by HOLD (“hld“).
(9) NM AT
Pushbutton with a double function and associated
NM LED.
NM AT selection:
Press and hold the pushbutton to switch over from
automatic (peak value) to normal triggering (NM LED
above the pushbutton lit) and vice versa. If the LED is
dark, automatic or automatic peak value triggering is
selected.
AT:
Automatic triggering can be carried out with or without
peak capture. In both cases the LEVEL control (11) is
effective and the trace is visible even if no signal is applied
or trigger settings are unsuitable. Signal frequencies
below the automatic trigger frequency can not be
triggered as the automatic trigger cycle starts to early for
such signals.
In the automatic peak value triggering condition the LEVEL
control (11) range is limited to the trigger signal positive
and negative peak values. Automatic triggering without
peak value detection enables the trigger point to be set
outside the signal amplitude range. In the latter case,
although untriggered, there is still a signal display.
Whether the peak value detection is active or not depends
on the operating mode and the selected trigger coupling.
The actual state is recognised by the behaviour of the
trigger point symbol when changing the LEVEL setting.
NM:
Normal triggering disables both the automatic trigger and
the peak value detection so even low frequency signals
can be displayed in a stable manner. Without suitable input
signal height, trigger coupling and LEVEL settings, no trace
will be displayed
.
Analog only:
The last LEVEL setting of the time base is stored, then the
control again becomes active when selecting triggering
after delay (DEL.MODE (“dTr”)) time base mode (quasi
2nd time base). In combination with In “dTr” mode the
LEVEL control is operative for the “2
nd
time base”.
/ \ (Slope selection):
Each time this pushbutton is briefly pressed, the slope direction
switches from falling edge to rising edge and vice versa. The
current setting is displayed in the readout by a slope symbol.
The last setting in undelayed time base mode is stored and
still active if triggered delay
(“dTr”)
time base mode is selected
(analog only). This allows for a different slope setting for the
triggered
DELAY (dtr)
time base mode.
(10
)
TR
Trigger indicator LED.
The
TR
LED is lit in
Yt
mode if the triggering conditions
are met for the first trigger unit used in undelayed time
base mode. Whether the LED flashes or is lit constantly
depends on the frequency of the trigger signal.
In XY mode the TR LED is switched off.
(11) LEVEL
Control knob.
Turning the
LEVEL
knob causes a different trigger point
setting (voltage). The trigger unit starts the time base when
the edge of a trigger signal crosses the trigger point. In
most Yt modes the trigger point is displayed in the readout
by the symbol on the left vertical graticule line. If the trigger
point symbol would overwrite other readout information
