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Appendix B: Waveform Data in MSO/DPO2000B and

MSO/DPO2000 Series Instruments

An analog channel of an MSO/DPO2000B and MSO/DPO2000 series

instrument has a sample waveform and a peak detect waveform being acquired

simultaneously. This combination waveform is referred to as a “composite”

waveform. In some cases, for example when averaging is turned on, or for math

waveforms

, a composite waveform is not available. In these cases, the waveform

is termed “singular”, and is available only in sample mode.

Full Versus Reduced

Resoluti

on Waveforms

The MSO/DPO2000/B series introduces the concept of reduced resolution

waveform

s available for curve queries. The MSO/DPO2000/B oscilloscopes

acquire channel data into “full” resolution records that are nominally 1 million

(1M) or 100,000 (100K) points in size (the acquisition record length); these are

termed “full resolution”, or LRL (long record length) waveforms. These LRL

records are “shrunk” (decimated) down to “ thumbnail”, “short”, or “reduced

resolution” waveforms; these are what appear on the oscilloscope’s display

scree

n. During decimation, a low-pass ﬁlter operation may be applied to the LRL

sample data that results in a ﬁltered thumbnail wavefor m. In general, both full

and reduced resolution waveforms can be queried from the oscilloscope. The size

of the reduced resolution waveform varies from 800 to 6250 points, depending

on instrument settings.

Math FFT waveform data is available only in FULL resolution.

For applications which need to query waveform data rapidly for the purpose of

displaying it, reduced resolution waveform data will provide a faster display

update than a full resolution waveform data.

Nominal Versus Actual

Record Length

The MSO/DPO2000/B series also introduces the concept of nominal versus actual

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 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 t he acquisition. The v alid values

for setting acquisition record length a re 1,000,000 (1M) and 100,000 (100K)

points. Depending on the h orizontal scale in effect at the time of the acquisition, a

nominal 1M point record may b e comprised of 1.0M or 1.25M (1,250,000) points

and a nominal 100K point record may be comprised of 100K or 125K (125,000)

points. The actual number of points in the waveform record for the source

waveform (speciﬁed by the DATa:SOUrce command) may be obtained using the

WFMOutpre:RECOrdlength? query.

MSO2000B, DPO2000B, MSO2000 and DPO2000 Series Oscilloscopes Programmer Manual B-1

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