Tektronix, Inc. P6240, User Manual

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Glossary
Glossary–2
TLS 216 User Manual
gated region. Expressed in volt-seconds. Area above ground is positive; area
below ground is negative.
Automatic trigger mode
A trigger mode that causes the logic scope to automatically acquire if
triggerable events are not detected within a specified time period.
Autoset
A function of the logic scope that automatically produces a stable waveform
of usable size. Autoset sets up front-panel controls based on the characteris-
tics of the active waveform. A successful autoset will set the volts/div,
time/div, and trigger level to produce a coherent and stable waveform
display.
Average acquisition mode
In this mode, the logic scope acquires and displays a waveform that is the
averaged result of several acquisitions. That reduces the apparent noise. The
logic scope acquires data as in the sample mode and then averages it
according to a specified number of averages.
Bandwidth
The highest frequency signal the logic scope can acquire with no more than
3 dB (
×
.707) attenuation of the original (reference) signal.
Burst width
A timing measurement of the duration of a burst.
BusForm Mode
A logic scope display mode that displays each waveform in the group as one
or more of three digital logic levels defined as HIGH, LOW, or indefinite
(between HIGH and LOW). The levels displayed depend on comparisons
against two display threshold levels that you define. Use BusForm mode to
measure the idealized response of waveforms with respect to defined
thresholds. (See Analog Mode, Timing Diagram Mode, and OFF Mode.)
Channel
Input used for signal acquisition. The logic scope has 16 channels that it can
display in up to eight groups. To be displayed, channels must be part of a
waveform group. (See Group.)
Group Reference Indicator
In Analog display mode, the indicator on the left side of the display that
points to the position around which the waveform contracts or expands when
vertical scale is changed. This position is ground when offset if set to 0 V;
otherwise, it is ground plus offset.
In BusForm display mode, the indicator points to the midpoint between the
HIGH and LOW logic levels for all waveforms in the group.