MDO3000 Programmer Manual.pdf - 第88页

Command Groups T able 2-37: RF Commands (cont.) Item Description SEARCH:SPECTral:LIST? This query will return a list o f all automatically placed peak markers displayed in the frequency domain graticule. (T o return info…

Command Groups

Table 2-37: RF Commands (cont.)

Item Description

RF:SPECTRogram:NUMSLICEs? This query returns the number of spectrogram slices that are currently being rendered. A

spectrogram slice is a section of the spectrogram representing oneinterval,orslice,oftime

in the spectrogram record.

RF:SPECTRogram:SLICESELect This command speciﬁes the s pectrogram slice number that is to be displayed. Allowable

slice numbers range from 0 to –327 in full-screen mode, and 0 to –147 in split-screen mode.

(The range is negative because the numbering starts with the latest slice (0) and proceeds

backwards in time.) The slice can only be sel ected or changed when acquisitions have been

stopped. As soon as acquisitions start again, the slice number is reset to 0 (the latest slice).

Attempts to select a slice number outside of range, or when acquisitions are running, are

ignored. The query form returns the currently selected spectrogram slice.

To use this command, ﬁrst turn on the spectrogram (RF:SPECTRogram:STATE). Then

query the number of slices (RF:SPECTRogram:NUMSLICEs?). Stop the acquisition

when you’ve reached the number of desired slices . Then select the slice to display

(RF:SPECTRogram:SLICESELect).

Each slice of the spectrogram corresponds to a single RF acquisition. The FFT samples the

entire spectrum for the incoming signal (at the rate with which new spectrums are acquired).

The newest spectrum is on the bottom edge of the spectrogram, and the oldest is on the top

edge. When the oscilloscope is stopped, you can scroll “back in time” through the spectrogram

using the spectrum slice control. When you select a spectrogram slice, it is displayed in the

bottom window as the RF Normal trace.

RF:SPECTRogram:SLICETIMe? Returns the time stamp of the selected spectrogram slice, as speciﬁed by the command

:RF:SPECTRogram:SLICESELect.

RF:SPECTRogram:STATE This command switches the frequency domain spectrogram display on or off.

RF:SPECTRogram:TIMe? Queries the number of seconds in the spectrogram since continuous acquisition started. The

value returned is always <= 0.

RF:SPECTRUMMode When only the frequency domain waveforms are displayed, this command speciﬁes the RF

spectrum mode: either

TRIGgered or FREErun. The default i s FREErun.

RF:SPECTRUMTrace

Resets the spectrum traces,

RF_MINHold, RF_MAXH old and RF_AVErage.

RF:SQUELCH:STAT E This command turns the squelch control on or off for the RF Frequency vs. Time and RF Phase

vs. Time traces. When squelch is on, only the portions of these traces where the amplitude

exceeds the squelch threshold are displayed. This prevents the display of Phase and/or

Frequency for signals that are at or near noise levels. The RF amplitude can be observed in

the RF Amplitude vs. Time trace.

RF:SQUELCH:THReshold This command speci ﬁes the s quelch threshold level, in volts, for the RF Frequency vs. Time

and RF Phase vs. Time traces.

RF:STARt This command speciﬁes to exclude frequencies below a certain level from use.

RF:STOP This command speciﬁes to exclude frequencies above a certain level from use.

RF:UNIts

This command speciﬁes the vertical units to be used in all RF-related absolute logarithmic

amplitudes.

RF:WINdow

This command speci ﬁes which window will be used for the windowing function, which is only

used for the three time domain RF traces (Amplitude vs. Time, Frequency vs. Time and

Phase vs. Time). The default window is Kaiser.

MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-57

Command Groups

Table 2-37: RF Commands (cont.)

Item Description

SEARCH:SPECTral:LIST? This query will return a list o f all automatically placed peak markers displayed in the frequency

domain graticule. (To return information about manual markers, use the MARKER:M<x>

commands.)

SELect:RF_AMPlitude This command switches the RF Amplitude vs. Timetracedisplayonoroffinthetimedomain

graticule.

SELect:RF_AVErage This command switches the R F Average trace display on or off in the frequency domain

graticule.

SELect:RF_FREQuency This command switches the RF Frequency vs. Time trace display on or off in the time domain

graticule.

SELect:RF_MAXHold This command switches the frequency domain Max Hold trace display on or off in the

frequency domain graticule.

SELect:RF_MINHold This command switches the frequency domain Min Hold trace display on or off in the frequency

domain graticule.

SELect:RF_NORMal This command switches the frequency domain Normal trace display on or off in the frequency

domain graticule.

SELect:RF_PHASe This command switches the RF P hase vs. Time trace display on or off in the time domain

graticule.

Save and Recall Command Group

UsethecommandsintheSaveandRecallCommand Group to store and retrieve

wav

eforms and settings. When you save a setup, you save all the settings of the

oscilloscope. When you recall a setup, the oscilloscope restores itself tothestate

it was in when you originally saved the setting.

NOTE. External ﬁlestructureisasfollows:

E: is the USB memory device plugged into the ﬁrst USB port o n the front of the

oscilloscope.

F: is the USB memory device plugged into the second USB port on the front of the

oscilloscope. (Not available for MDO3000 models).

G: and H: are the USB memory device plugged into the USB ports on the rear o f

the oscilloscope. (Not available for MDO3000 models.)

I: — Z are for network storage.

2-58 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual

Command Groups

NOTE. Analog, d

igital, and RF waveforms and traces and those waveforms and

traces derived from them ( such as math and reference) can be saved to an ISF

ﬁle. When saving all channels in ISF format, a group of ﬁles will be saved.

Each will have the same value for XXXX, but the YYY values will be set to the

different channels that were turned on when the Save All Waveforms operation

was performed.

The oscilloscope can save, but not recall, RF acquisitions as .TIQ ﬁles. You can

import .TIQ ﬁles into Tektronix SignalVu-PC software (PC based), SignalVu

software (

oscilloscope based), RSAVu software (PC based) or into a Tektronix

real-time spectrum analyzer for pulse analysis and demodulation analysis.

Table 2-3

8: Save and Recall Commands

Command

Descript

ion

FACtory Resets the oscilloscope to factory default s ettings

*RCL

Recalls

saved oscilloscope settings

RECAll:SETUp

Recall

s saved oscilloscope settings

RECAll:SETUp:DEMO<x> This command recalls one of the 6 speciﬁed built-in demonstration setups of RF functionality.

<x> can be 1 through 6. The demonstrations include 1. Multiple Peaks, 2. spectrogram, 3.

VCO/P

LL Turn On, 4. ASK Modulation, 5. Frequency Hop and 6. Capture BW.

RECA

ll:WAVEform

This

command (no query form) recalls a stored waveform to a reference memory location,

and, for instruments with the arbitrary waveform feature, to arbitrary waveform edit memory

(EMEM). Only the ﬁrst waveform in the .CSV ﬁle is recalled for multiple waveform .CSV ﬁ les.

Reca

ll of digital waveforms (D0 through D15) is not supported.

*SA

Sto

res the state of the oscilloscope to a s peciﬁed memory location

Ve:ASSIgn:TYPe

is command speciﬁes the assignment of the save button

Ve:EVENTtable:{BUS<x>|B<x>}

ves event table data from bus<x> to a speciﬁed ﬁle

AVe:IMAGe

aves a capture of the screen image to the speciﬁed ﬁle

AVe:IMAGe:FILEFormat

his command speciﬁ es the ﬁle format to use for saving screen images. The ﬁle format is

not automatically determined by the ﬁle name extension. You need to choose a ﬁle name

with an extension w hich is consistent with the selected ﬁle format

SAVe:IMAGe:INKSaver This command speciﬁes the current inksaver setting for the SAVe:IMAGe command

SAVe:IMAGe:LAYout This command speciﬁes the layout to use for saved screen images

SAVe:SETUp Saves the state of the oscilloscope to a speciﬁed memory location or ﬁle

SAVe:WAVEform This command saves the speciﬁed w aveform to the speciﬁed destination reference memory

slot, or saves the speciﬁed waveform(s) to the speciﬁed destination ﬁle. The same function

can be accomplished from the front panel Menu->save waveform m enu. The type of ﬁle

saved is dependent upon the SAVe:WAVEform:FILEFormat command.

SAVe:WAVEform:FILEFormat This command speciﬁes the format for saving waveforms.

This command speciﬁes the ﬁle format to be used when saving waveforms — either an

internal format, .ISF, or an external comma-delimited spreadsheet format, .CSV, that

includes waveform header and timing information.

SAVe:WAVEform:FILEFormat:

RF_BB_IQ

This command speciﬁes the ﬁle format for saving the RF baseband I & Q data. The default

format is TIQ.

MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-59