Tektronix MSO54, Programmer'S Manual

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Commands listed in alphabetical order
Group Acquisition
Syntax
ACQuire:MODe {SAMple|PEAKdetect|HIRes|AVErage|ENVelope}
ACQuire:MODe?
Related Commands ACQuire:NUMAVg , CURVe
Arguments
SAMple
speci fi es that the displayed data point value is the fi rst sampled value
that is taken during the acquisition interval. In sample mode, all waveform data
has 8 bits of precision. You can request 16 bit data with a
CURVe query but the
lower-order 8 bits of data will be zero.
SAMple
is the default mode.
PEAKdetect
speci fi es the display of high-low range of the samples taken from a
single waveform acquisition. The high-low range is displayed as a vertical column
that extends from the highest to the lowest value sampled during the acquisition
interval.
PEAKdetect
mode can reveal the presence of aliasing or narrow spikes.
HIRes
speci fi es Hi Res mode where the displayed data point value is the
average of all the samples taken during the acquisition interval. This is a form
of averaging, where the average comes from a single waveform acquisition. The
number of samples taken during the acquisition interval determines the number of
data values that compose the average.
AVErage
speci fi es averaging mode, in which the resulting waveform shows an
average of
SAMple
data points from several separate waveform acquisitions. The
instrument processes the number of waveforms you specify into the acquired
waveform, creating a running exponential average of the input signal. The number
of waveform acquisitions that go into making up the average waveform is set or
queried using the
ACQuire:NUMAVg command.
ENVelope
speci fi es envelope mode, where the resulting waveform shows the
PEAKdetect
range of data points from several separate waveform acquisitions.
The number of waveform acquisitions that go into making up the envelope
waveform is set or queried using the
ACQuire:NUMAVg command.
The instrument acquires data after each trigger event using Sample mode; it then
determines the pix map location of each sample point and accumulates it with
stored data from previous acquisitions.
A Pix map is a two dimensional array. The value at each point in the array is
a counter that re
fl ects the hit intensity. In fi nite and nonin fi nite persist display
modes affect how pix maps are accumulated. Zoom, Math, FastAcq, FastFrame,
XY, Roll, and Interpolated Time (IT) Sampling Mode are con
fl icting features to
WFMDB acqMode. Turning on one of them generally turns the other one off.
Selection of some standard masks (for example, eye masks, which require option
MTM) changes the acquisition mode to WFMDB.
MSO54, MSO56, MSO58, MSO58LP Programmer 2-95