Operation
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.
Frequency
Limit for
Auto
Level
or
Parametric Measurements
The minimum frequency of operation for parametric measurements is selectable.
The minimum limits are 50 Hz and 10 Hz. Selecting 10 Hz causes all measurements
to be significantly slower. These can be selected by the following steps:
1.
Press the MEASURE button.
2.
If the
CTT is
present, select MORE from the menu. Otherwise, go to Step 3.
3. Select CONFIG from the menu.
4.
Select MINFREQ from the menu.
5. Push the appropriate mode button to select the desired minimum frequency
limit. This selection will be reset to 50 Hz whenever power is turned off.
DMM
The available Digital Multimeter
(DMM)
adds a powerful set of floating-input
measurements. Seethe last few pages of the "Controls, Connectors, and Indicators'"
section for operating information.
2465B/2455B/2445B Operators
2-35
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