Appendix B: Waveform Data in MSO/DPO2000B and MSO/DPO2000 Series Instruments
Composition of Waveform
Data
The MSO/DPO200
0/B series introduces the concept of composite waveform data
for analog channels. Sample data is always available for acquired analog channel
waveforms. Composite waveforms are available in
SAMPLE acquisition mode
but are not available in
AVERAGE acquisition mode. Peak data may be available
depending on the instrument bandwidth, acquisition mode, n ominal record length,
and the horizontal scale settings.
Sample waveform data which may be a component of a composite waveform
is referred to as
COMPOSITE_YT (vertical units versus time) data.
Peak detect waveform data which may be a component of a composite
waveform is referred to as
COMPOSITE_ENV (envelope or peak detect
min/max p
airs versus time) data.
Analog channel waveforms acquired in AVERAGE acquisition mode and MATH
wavefor
ms are not composite waveforms and are termed
SINGULAR_YT which
indicates that the waveform is a single waveform composed of data points
representing vertical units versus time. The composition of digital waveform
data (:DATa:SOUrce D0 through D15, DIGital) is
SINGULAR_YT only.
The following table lists the various waveform data compositions:
Compo
sition
Descr
iption
COMP
OSITE_YT
(analog channels)
This
is sample waveform data in v ertical units versus time. Its native
width is 8-bits and is written as 8-bit data in saved ISF waveform
files and reference waveforms. The data can be queried as 1- or
2-by
te data in CURVe? queries by setting the data width to 1 or 2.
COM
POSITE_ENV
(analog channels)
Thi
s is min/max pair waveform data with the minimum value
preceding the maximum value. Its native width is 8-bits and is
written as 8-bit data in saved ISF waveform files and reference
wav
eforms. The data can be queried as 1- or 2-byte data in
CURVe? queries by setting the data width to 1 or 2.
SINGULAR_YT
(analog and math
ch
annels)
This is 16-bit waveform data w hich originates as averaged acquired
waveform data or math data. It is written to saved ISF waveform
fil
es and reference waveforms as 16- bit data. The data can be
queried as 1-or 2- byte data in CURVe? queries by setting the data
width to 1 or 2.
SINGULAR_YT
(
digital channels)
This is sample waveform data in binary vertical units (0 or 1) versus
t
ime. Its native width is 8-bits for individual digital channels (D0
through D15) and 32 bits for the digital collection (D0 through D15,
digital representation of CH1 through CH4). The only resolution
available for digital waveform data is FULL.
The available waveform compositions, which can be obtained using the CURVe?or
WAVF r m ? queries, can be determined using the DATa:COMPosition:AVAILable?
query. This query returns the available waveform compositions for the last
acquired waveform for the source specified by the DATa:SOUrce comma nd.
The data returned by the DATa:COMPosition:AVAILable? query may be one
of the following:
B-2 MSO2000B, DPO2000B, MSO2000 and DPO2000 Series Oscilloscopes Programmer Manual
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