Instruction manual

15
Subject to change without notice
amplitude variations ( e.g. noise) and frequency variations
(Jitter) are minimized or eliminated in the display.
The accuracy of the mean value evaluation increases as
the number of signal acquisition scans used for
evaluation is increased. One can select the number
between 2 and 512. The selected setting is displayed in
the readout. Of course, with increasing accuracy the
time required for this also increases.
To select a different value briefly press both STOR.
MODE pushbuttons simultaneously. The AV... display
in the readout flashes indicating the setting mode. Now,
the value can be changed by briefly pressing the upper
or lower STOR. MODE pushbutton. The setting mode
can be exited by again briefly pressing the two
pushbuttons simultaneously. The setting mode will also
be switched off automatically if none of the two
pushbuttons is actuated during a 10 seconds period.
The averaging begins anew after briefly pressing the
SINGLE (10) pushbutton (RESET function).
Attention!
The pre- or post trigger will be automatically switched
off (PT0%) in the time base range from 100s/div to
50ms/div.
(9) ROL - indicates ROLL mode.
In ROLL mode the ROL-LED is lit and the readout
displays ”ROL”.
In this mode, the memory contents and including the
signal display, are continuously updated. Because signal
capture is untriggered, no idle states arise while waiting
for a new trigger event to start signal capture. With each
signal sampling the new value is shown on the right-
hand edge of the screen, while the previously captured
data are shifted to the left. The leftmost value is shifted
out of the memory and lost.
The recording can be stopped at any time by selecting
the HOLD (7) function.
ROLL mode can only be used with time coefficients
from 100s/div to 50ms/div, as lower time coefficients
(faster time base speeds) are impractical.
If the time base is set to values between 20ms/div and
100ns/div and ROLL mode is selected, the time base
will be automatically set to 50ms/div. The time deflection
coefficient set previously before switching to ROLL
mode will be internally stored (e.g. 20ms/div). If ROLL
mode has been selected inadvertently and the TIME/
DIV. knob has not been changed, the time base will be
automatically set to the internally stored coefficient when
switching from ROLL to AVERAGE mode.
(10) SINGLE - Pushbutton with two functions and associated
LEDs.
SINGLE
Pressing and holding this pushbutton switches the
SINGLE event capturing mode on or off. SINGLE mode
is indicated by the associated SGL-LED.
SINGLE mode is available in digital as well as in analog
mode and remains unchanged when switching over from
analog to digital mode or vice versa. The main purpose
of SINGLE is the capture of one time events, but it can
also be used in combination with repetitive signals.
SINGLE mode automatically selects A time base mode
and normal triggering (NM-LED lit). Otherwise the
automatic trigger (AT) would occur without an input
(trigger) signal.
If the trigger circuit is activated by RESET, one time
base sweep (analog mode) or one complete data
acquisition (digital mode) is performed after a suitable
signal caused triggering. Switching over to SINGLE in
analog mode interrupts the time base sweep and blanks
the beam.
Storage mode only
Selecting SINGLE stops the current data acquisition. Until
a new data acquisition is started, the memory content
is displayed continuously.
In combination with Yt (time base) mode, SINGLE is
indicated by the readout. It displays the actual pre- or
post trigger value and ”SGL” instead of ”RFR”, ”ENV”,
”AV...” or ”ROL”. If XY mode is active the A time
deflection coefficient is replaced by the sampling rate
(e.g. 100MS/s) display in the readout and additionally
the trigger regarding information is switched off.
Attention!
If SINGLE mode is present in combination with
DUAL mode, the minimum time coefficient is 2µs/
div instead of 100ns/div. Similarly if X-MAG. x10 is
operative, then 200ns/div replaces 10ns/div.
ANALOG MODE ONLY
Selecting SINGLE mode switches the current sweep
off and blanks the screen.
SINGLE mode is indicated by the lit SGL-LED and the
readout displaying SGL next to the / (SLOPE) symbol.
RESET (RES)
Briefly pressing the SINGLE pushbutton causes a RESET
activating the trigger circuit if Yt mode is active. The
result depends on the current signal capture mode.
STORAGE MODE ONLY
a)
In combination with SINGLE, briefly pressing the
SINGLE pushbutton activates the RESET function. Then
both LEDs (SGL and RES) are lit. Whether the RES-
LED flashes once or is lit constantly, depends on:
1. the presence or absence of a trigger signal,
2. the selected time coefficient (time base) and
3. the pre- or post trigger setting.
After the RESET function is switched on, the signal
acquisition will be effective at once if the HOLD function
is not active. If the pre trigger function is active, the
prehistory must elapse before the trigger event becomes
effective. The signal capture terminates with the trigger
event only with 100% pre trigger setting.
With all other pre trigger and post trigger settings, the
signal acquisition is not complete when the trigger occurs
Controls and Readout