Appendix B: Wa veform Data in MSO/DPO2000B and MSO/DPO2000 Series Instruments
Querying Acquisition
Peak Detect Data from the
Instrument
1. Use the DATa:CO
MPosition:AVAILable? query to determine if peak detect
data
(COMPOSITE_ENV) is available. This query returns a list of waveform
data types that are available from the instrument under the current instrument
settings:
COMPOSITE_YT for sample data
COMPOSITE_ENV for envelope or peak detect data
SINGULAR_YT for sample data
2. If
COMPOSITE_ENV is available, set the data composition to COMPOSITE_ENV
(:DATa:COMPosition COMPOSITE_ENV). Otherwise, the peak detect data
is not available and cannot be queried from the instrument.
3. CURVe? will now return peak detect data.
Querying Acquisition YT
Sample Data from the
Instrument
The sequence used to query sample data is nearly identical to the one used for
peak detect data. Set the data composition to
COMPOSITE_YT or SINGULAR_YT
(based on results of the DATa:COMPosition:AVAILable? query); CURVe? will
now return sample data.
Selecting Acquisition
Record Length
Like other oscilloscopes, the acquisition record length can be set using the
HORizontal:RECOrdlength command. However, the actual number of points
in the acquired waveform record may differ from the nominal record length
established by the HORizontal:RECOrdlength setting, depending on the
HORizontal:SCAle in effect at the time of the acquisition. The allowed values for
setting the acquisition record length are 1,000,000 (1 million) and 100,000 (100
thousand) points. Depending on the horizontal scale in effect at the time of the
acquisition, a nominal 1 million point record may be composed of 1.0 million or
1.25 million p oints and a nominal 100 thousand point record may b e composed of
100 thousand or 125 thousand points. The actual number of points acquired for
the source waveform (specified by the DATa:SOUrce command) may be obtained
using the WFMOutpre:RECOrdlength? query.
For reduced resolution waveforms, the actual record length depends on the
FilterVu frequency in effect in addition to the horizontal settings. The reduced
resolution record lengths vary with the FilterVu frequency.
High Resolution and Envelope acquisition modes are not supported in
MSO/DPO2000/B series instruments.
For the digital waveforms (D0 through D15), the actual record length may differ
from the nominal record length established by the HORizontal:RECOrdlength
setting, depending on the HORizontal:SCAle in effect at the time of the
acquisition and whether digital waveforms are selected from one or both of the
digital p ods (whether digital channels are turned on for D0 through D7, and for D8
through D15). For faster horizontal scales, the actual record length may be half
of the nominal record length when digital waveforms from b oth digital pods are
MSO2000B, DPO2000B, MSO2000 and DPO2000 Series Oscilloscopes Programmer Manual B-5
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