The pre-trigger indicator is displayed by an upward pointing arrow on
the bottom graticule line; the post-trigger indicator is displayed in
decimal fractions of a second, preceded by a leftward-pointing arrow,
in the left-hand corner of the Trigger Delay field (III).
ZERO (35) - Resets the trigger delay from previously set positions
the leftmost graticule line (i.e. 0.0% Pre-trigger position).
5.1.4 Displaying Traces
Up to four different waveforms (out of a total of eight) may
simultaneously displayed. Whenever a trace is displayed by pressing one
of the TRACE ON/OFF buttons ((46)-(49)), the corresponding waveform
will appear on the screen together with a short description in the
Displayed Trace field (V). When several signals are being displayed
simultaneously, buttons (46)-(49) can be used as convenient trace
identifiers by repeatedly pressing one of these buttons and simply
seeing which of the displayed traces is turned ON and OFF by this
operation.
EXPAND A, B buttons (46) - Turn the displayed expansion of a waveform
ON or OFF. The expanded portion of the waveform is displayed on the
source trace as an intensified region. The default settings are;
EXPAND A operates on CHANNEL 1 and EXPAND B operates on CHANNEL 2. They
may be changed to allow expansion on any other source trace, by using
the REDEFINE button (48).
MEMORY C, D buttons (47) - Turn the display of a waveform in reference
Memories C or D ON or OFF. Acquired data may be stored into these
memories via the STORE button (I), as described in Section 5.2.1.
FUNCTION E, F buttons (48) - If your 9400A is equipped with a waveform
processing firmware option, pressing these buttons will turn the
display of a computed waveform ON or OFF. The type of computation may
be defined by pressing the REDEFINE button (45). See WPOI Waveform
Processing Option, Section I0.
CHANNEL I, 2 buttons (49) - Turn the display of signals applied
either of the input connectors (21) ON or OFF. Recording of data into
CHAN 1 and CHAN 2 acquisition memories always occurs simultaneously and
irrespective of whether the trace display is ON or OFF.
5.1.5 Display Control
Displayed traces may be modified within certain limits following
waveform acquisition.
The
CHAN 1 and CtlAN 2 traces are controlled by the VERTICAL and Time
Base controls ((27), (28), (32) and (36), (37), respectively).
Manual Operation
5-12
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