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Glossary
Glossary
GlossaryĆ8
RealĆtime sampling
A sampling mode where the digitizing oscilloscope samples fast
enough to completely fill a waveform record from a single trigger
event. Use realĆtime sampling to capture singleĆshot or transient
events. (All TDS 600A series oscilloscopes use real time sampling at
all acquisition rates.)
Record length
The specified number of samples in a waveform.
Reference memory
Memory in a oscilloscope used to store waveforms or settings. You
can use that waveform data later for processing. The digitizing
oscilloscope saves the data even when the oscilloscope is turned off
or unplugged.
Rise time
The time it takes for a leading edge of a pulse to rise from a LowRef
value (typically 10%) to a HighRef value (typically 90%) of its ampliĆ
tude.
RMS
Amplitude (voltage) measurement of the true Root Mean Square
voltage.
Runt trigger
A mode in which the oscilloscope triggers on a runt. A runt is a
pulse that crosses one threshold but fails to cross a second threshĆ
old before recrossing the first. The crossings detected can be posiĆ
tive, negative, or either.
Sample acquisition mode
The oscilloscope creates a record point by saving the first sample
during each acquisition interval. That is the default mode of the
acquisition.
Sample interval
The time interval between successive samples in a time base. For
realĆtime digitizers, the sample interval is the reciprocal of the samĆ
ple rate. For equivalentĆtime digitizers, the time interval between
successive samples represents equivalent time, not real time.
Sampling
The process of capturing an analog input, such as a voltage, at a
discrete point in time and holding it constant so that it can be quanĆ
tized. Two general methods of sampling are: realĆtime sampling and
equivalentĆtime sampling.
Select button
A button that changes which of the two cursors is active.
Selected waveform
The waveform on which all measurements are performed, and which
is affected by vertical position and scale adjustments. The light over
one of the channel selector buttons indicates the current selected
waveform.