MDO3000 Programmer Manual.pdf - 第140页

Command Groups Zoom Command G roup Use the commands in the Zoom Comman d Group to expand and position the waveform display horizontally , wit hout c hanging the time base settings. Ta b l e 2 - 4 9 : Zoom Commands Comman…

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Command Groups
Table 2-48: Waveform Transfer Commands (cont.)
Command
Description
WFMOutpre:PT_ORder?
This query returns the point ordering, which is always linear.
WFMOutpre:REFLEvel? This query returns the Reference Level of the outgoing waveform. It applies only to the four
frequency domain waveforms (RF N ormal, RF Average, RF Max Hold, and RF Min Hold).
WFMOutpre:SPAN? This query returns the frequency span of the outgoing waveform. For non-MDO models, this
query always returns 0.0.
The span is the range of frequencies you can observe around the center frequency.
WFMOutpre:WFId? This query returns a string that describes several aspects of the acquisition parameters for
the source waveform, including Source, Coupling, Vertical Scale, Horizontal Scale, Record
Length and Acquisition Mode. If the waveform specified by DATa:SO Urce command is
not turned on, an error will be generated.
WFMOutpre:WFMTYPe? This query returns the type of the outgoing waveform. RF_FD indicates an RF frequency
domain waveform; RF_TD indicates an RF time domain waveform; ANALOG indicates
Channel 1–4 or the Math waveform. The default is analog. For non-MDO models, this
query always returns ANALOG.
The type of waveform that is being transferred in turn determines which window will display
it on the instrument screen: (the time domain window or frequency domain window).
WFMOutpre:XINcr? This query returns the horizontal point spacing in units of time (seconds), or frequency
(hertz) between data points in the waveform record transferred using the
CURVe? query.
This value corresponds to the sampling interval.
WFMOutpre:XUNit? This query indicates the horizontal units of the x-axis of the waveform record transferr ed
using the
CURVe? query. Typically, this value is "s" when the waveform source is displayed
in the time domain, and "Hz" when the waveform source is displayed in the frequency
domain. When the waveform source is Math or a reference waveform, the value can be
"s" or "Hz".
WFMOutpre:XZEro? This query returns the time coordinate, in seconds, or frequency, in hertz, of the first data
point in the outgoing waveform record transferred using the
CURVe? query. This time or
frequency is r elative to the time of the trigger, which is always 0. Thus, the XZEro time or
frequency can be negative.
WFMOutpre:YMUlt? This query returns the vertical scale multiplying factor used to convert the waveform data
point values in the outgoing waveform record from digitizing levels to the YUNit units. You
can determine the units by using the
WFMOutpre:YUNit query.
See the description of the WFMInpre:YMUlt command to see how this scale factor is used to
convert waveform sample values to volts.
WFMOutpre:YOFf? This query returns the vertical position of the source waveform in digitizing levels. There are
25 digitizing levels per vertical division for 1-byte data, and 6400 digitizing levels per vertical
division for 2-byte data. See the description of WFMInpre:YOFf to see how this position is
used to convert waveform sample values to volts.
WFMOutpre:YUNit? This query returns the units of data points in the outgoing waveform record transferred
using the
CURVe? query. This can be any of several string values, depending upon the
vertical units of the source waveform (specified by the DATa:SOUrce command). Typically,
this is “V” for volts.
WFMOutpre:YZEro? This query returns the vertical offset of the s ource waveform. You can determine the units
using the WFMOutpre:YUNit? query. See the description of WFMInpre:YZE ro to see how
this offset is used to convert waveform sample values to volts.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-109
Command Groups
Zoom Command G
roup
Use the commands in the Zoom Command Group to expand and position the
waveform display horizontally, without changing the time base settings.
Table 2-49:
Zoom Commands
Command
Descriptio
n
ZOOm? Returns the horizontal positioning and scaling of the zoom display
ZOOm{:MODe|:STATE} This command speci fies the zoom mode
ZOOm:ZOOM<x>? Returns the current horizontal positioning and scaling of the zoom display
ZOOm:ZOOM<x >:FACtor? Returns the zoom factor of the zoom window. <x> can only be 1
ZOOm:ZOOM<x >:P OSition This command specifies the horizontal position of the zoom window in terms of 0 to 100% of
the overview window. <x> can only be 1
ZOOm:ZOOM<x >:SCAle This command specifies the horizontal zoom scale of the zoom window. <x> can only be 1
ZOOm:ZOO M<x >:S TATE Specifies or returns a trace as zoomed, on or off. <x> can only be 1
ZOOm:ZOOM<x>:TRIGPOS? This query returns the time relative to trigger of the center of the zoom box, for the currently
selec
ted waveform.
2-110 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
ACQuire? (Query Only)
Returns the f
ollowing current acquisition parameters:
Stop after
Acquisition state
Mode
Number of averages
Sampling mode
Group
Acquisition
Syntax
ACQuire?
Related Commands
ACQuire:MODe,
ACQuire:NUMACq?,
ACQuire:NUMAVg,
ACQuire:STOPAfter
ACQuire:FASTAcq
Sets or queries the FastAcq feature. This feature provides a high-speed waveform
capture rate to help capture signal anomalies.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
Acquisition
Syntax
ACQuire:FASTAcq
Examples
:ACQUIRE:FASTACQ? might return: :ACQUIRE:FASTACQ:STATE 0;PALETTE
TEMPERATURE
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-111