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Glossary
Glossary
Positive width
A timing measurement of the distance (time) between two amplitude
points — rising-edge
MidRef
(default 50%) and falling-edge
MidRef
(default 50%) — on a positive pulse.
Posttrigger
The specified portion of the waveform record that contains data
acquired after the trigger event.
Pretrigger
The specified portion of the waveform record that contains data
acquired before the trigger event.
Probe
An oscilloscope input device.
Quantizing
The process of converting an analog input that has been sampled,
such as a voltage, to a digital value.
Probe compensation
Adjustment that improves low-frequency response of a probe.
Pulse trigger
A trigger mode in which triggering occurs if the oscilloscope finds a
pulse, of the specified polarity, with a width between, or optionally
outside, the user-specified lower and upper time limits.
Real-time sampling
A sampling mode where the digitizing oscilloscope samples fast
enough to completely fill a waveform record from a single trigger
event. Use real-time sampling to capture single-shot or transient
events.
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 oscil-
loscope 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 ampli-
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 threshold
before recrossing the first. The crossings detected can be positive,
negative, or either.