Operation
If a word
is
defined
in
one radix then displayed
in
another, some but not
all
bits
of a
hexadecimal or octal digit may
be
X (irrelevant), rendering the digit ambiguous.
Ambiguous digits are
displayed as question marks.
AT011XX XXXO
ATO
1?X077
BIN
OCT
ATO
??3F
HEX
When the
WR
defines the starting event or the counting event for Delay-by-
Events, the display shows both the
WR
status and the delay count. Any character
in
either field can
be
defined with MENU-SELECT.
The Word Out Signal
The available Word Recognizer (WR) generates a WORD OUT signal at a BNC
connector on the rear
panel. The output
is
TTL-high when the selected word is
recognized. The most recent word definition
controls the signal, whether or not the
function that invoked the
WR
is
active. The timing of the word occurrence, relative to
other
signals,
can
be
observed by connecting the WORD OUT signal
to
one vertical
channel
and using the remaining vertical channels for the other signals.
Propagation delay
of
word recognition prevents the oscilloscope from displaying
the signal transition that generates the trigger, when triggered by the
WR
or the
WORD OUT signal.
DMM
The available Digital Multimeter (OMM) adds a powerful set of floating-input
measurements.
See
the last few pages
of
the Ā·Controls, Connectors, and Indicators"
section for operating information.
2465A/2455A/2445A Operators
2-31