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W
S
MX
-B O
AVE
URFER
S
SCILLOSCOPE
Single-shot Sampling Mode
Basic Capture Technique
A single-shot acquisition is a series of digitized voltage values sampled on
the input signal at a uniform rate. It is also a series of measured data
values associated with a single trigger event. The acquisition is typically
stopped a defined number of samples after this event occurs: a number
determined by the selected trigger delay and measured by the timebase.
The waveform's horizontal position (and waveform display in general) is
determined using the trigger event as the definition of time zero.
You can choose either a pre- or post-trigger delay. Pre-trigger delay is the
time from the left-hand edge of the display grid forward to the trigger
event, while post-trigger delay is the time back to the event. You can
sample the waveform in a range starting well before the trigger event up
to the moment the event occurs. This is 100% pre-trigger, and it allows you
to see the waveform leading up to the point at which the trigger condition
was met and the trigger occurred. (The instrument offers up to the
maximum record length of points of pre-trigger information.) Post-trigger
delay, on the other hand, allows you to sample the waveform starting at
the equivalent of 10,000 divisions after the event occurred.
On fast timebase settings, the maximum single-shot sampling rate is used.
But for slower timebases, the sampling rate is decreased and the number
of data samples maintained.
The relationship between sample rate, memory, and time can be simply
defined as:
Capture Interval = 1/Sample Rate X Memory
and
Capture Interval/10 = Time Per Division
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WSMXs-B-GSM-E Rev A
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