MDO3000 Programmer Manual.pdf - 第145页

Commands Listed in Alphabetical Order Examples ACQUIRE:MODE E NVELOPE sets the acquisition mode to display a waveform that is an envelope of many indivi dual waveform acquisitions. ACQUIRE:MODE ? might return :ACQui re: …

Commands Listed in Alphabetical Order

ACQuire:MODe

Speciﬁes the acquisition mode of the oscilloscope for all analog channel

waveforms. The acquisition mode determines how the ﬁnal value of the

acquisition

interval is generated from the many data samples.

Waveforms are the displayed data point values taken from acquisition intervals.

Each acquis

ition interval represents a time duration set by the horizontal scale

(time per division). The oscilloscope sampling system always samples at the

maximum rate, so the acquisition interval may include more than one sample.

Group

Acquisition

Syntax

ACQuire:MODe {SAMple|P EAKdetect|HIRes|AVErage|ENVelope}

ACQuire:MODe?

Related Commands

ACQuire:NUMAVg, ACQuire:NUMEnv

CURVe

Arguments

SAMple speciﬁes that the displayed data point value is the ﬁrst sampled value

that is taken during the acquisition interval. In sample mode, all waveformdata

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 speciﬁes 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 speciﬁes 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 speciﬁes averaging mode, in which the resulting waveform shows an

average of SAMple data points from several separate waveform acquisitions. The

oscilloscope 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 speciﬁes envelope mode, where the resulting waveform shows the

PEAKdetect range of data points from every waveform acquisition.

2-114 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual

Commands Listed in Alphabetical Order

Examples

ACQUIRE:MODE E

NVELOPE

sets the acquisition mode to display a waveform that

is an envelope of many individual waveform acquisitions.

ACQUIRE:MODE

might return:ACQui re:MODe AVERAGE indicating that

the displayed waveform is the average of the speciﬁed number of waveform

acquisitions.

ACQuire:NU

MACq? (Query Only)

Returns the number of waveform acquisitions that have occurred since starting

acquisition with the ACQuire:STATE RUN command. This value is reset to zero

when any a

cquisition, horizontal, or vertical arguments that affect the waveform

are changed. The maximum number of acquisitions that can be counted is 2

Group

Acquisition

Syntax

ACQuire:NUMACq?

Related Commands

ACQuire:STATE

Returns

ACQuire:NUMACq? might return :ACQUIRE:N UMACQ 350 indicating that 350

acquisitions have occurred since executing an ACQuire:STATE RUN command.

ACQuire:NUMAVg

Speciﬁes the number of waveform acquisitions that should make up an averaged

waveform. Use the ACQuire:MODe command to enable the Average mode.

Sending this command is equivalent to turning a multipurpose knob to enter the

number of waveform acquisitions to average.

Group

Acquisition

Syntax

ACQuire:NUMAVg <NR1>

ACQuire:NUMAVg?

Related Commands

ACQuire:MODe, ACQuire:STATE

Arguments

<NR1> is the number of waveform acquisitions to average. The range of values is

from2to512inpowersoftwo.

MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-115

Commands Listed in Alphabetical Order

Examples

ACQUIRE:NUMAV

G16

speciﬁes that 16 waveform averages will be performed

before exponential averaging starts.

ACQUIRE:NUMA

VG?

might return :ACQUIRE:NUMAVG 64 indicating that there

are 64 acquisitions speciﬁed for averaging.

ACQuire:NUMEnv

This command controls the number of envelopes (when acquisition mode has

been set to ENVelope using ACQuire:MODe). The number of envelopes can

be set from 1 to 2000 in increments of 1, or to INFInite. Setting the value to a

number gr

eater than 2000 sets the number of envelopes to INFInite.

Group

Acquisition

Syntax

ACQuire:NUMEnv {<NR1>|INFInite}

ACQuire:NUMEnv?

Related Commands

ACQuire:MODe, ACQuire:STATE

Arguments

<NR1> is an integer that speciﬁes the number of envelopes to use when the

acquisition mode has been set to ENVelope.

INFInite speciﬁes to use an inﬁnite number of envelopes.

Examples

ACQuire:NUMEnv 22 sets the number of envelopes to 22.

ACQuire:NUMEnv? returns the number of envelopes that has been speciﬁed,

either an integer or INFINITE.

ACQuire:STATE

Starts or stops acquisitions. When state is set to ON or RUN, a new acquisition

will be started. If the last acquisition was a single acquisition sequence,anew

single sequence acquisition will be started. If the last acquisition was continuous,

a new continuous acquisition will be started.

If RUN is issued in the process of completing a single sequence acquisition (for

example, averaging or enveloping), the acquisition sequence is restarted, and

any accumulated data is discarded. Also, the oscilloscope resets the number of

acquisitions. If the RUN argument

is issued while in continuous mode, acquisition

continues.

2-116 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual