MDO3000 Programmer Manual.pdf - 第83页

Command Groups T able 2-37: RF Commands (cont.) Item Description RF:DETECTionmethod: RF_A VErage This command speci ﬁ es the detection method the oscilloscope should use when creating an RF Average trace in the frequency…

Command Groups

Table 2-37: RF C

ommands

Item Description

MARKER:M<x>:AMPLitude:

ABSolute?

This query ret

urns the actual amplitude (vertical) value of the either of the two manual markers

that are available for frequency domain traces, in dBm.

MARKER:M<x>

:AMPLitude:

DELTa?

This query returns the delta amplitude (vertica l) value of either of the two manual markers that

are available for frequency domain traces, in relation to the Reference Marker.

MARKER:M<x>:FREQuency:

ABSolute

This command speciﬁes the actual frequency (horizontal) value of either of the two manual

markers tha

t a re available for frequency domain traces.

MARKER:M<

x>:FREQuency:

DELTa?

This query

returns the delta frequency (horizontal) value of either of the two manual markers

that are available for frequency domain traces, in relation to the Reference Marker.

MARKER:M<x>:NOISEDensity?, This c ommand returns the noise density of the RF_NORMal trace at the speciﬁed marker

position in <RF Units>/Hz units, where <RF Units> are the units speciﬁed by the command

RF:UNIts

MARKER:

M<x>:PHASENoise?

This com

mand returns the phase noise of the RF_NORMal trace at the speciﬁed marker

position in dBc/Hz units.

MARKER:

MANual

This command switches on or off the manual markers a and b that are available for frequency

domain traces.

MARKER:PEAK:EXCURsion This command speciﬁes the excursion value, in user-selected units, for the frequency domain

trace a

utomatic peak markers. You can select the units with the command RF:UNIts.

MARKER:PEAK:MAXimum

This c

ommand speciﬁes the maximum number of frequency domain trace peaks that should

have automatic markers associated with them. This can be a number between 1 and 11.

MARKER:PEAK:STATE This command switches on or off the automatic peak markers that are available for frequency

domain traces. The default is 1 (on). There are up to 11 automatic markers.

MARKER:PEAK:THReshold

This command speciﬁes the threshold value, in the same vertical units as the source waveform,

of t

he automatic peak markers available f or frequency domain traces. (Use the RF:UNIts

to specify the units.)

MAR

KER:REFERence

This command changes the Center Frequency to the frequency indicated by the Reference

Marker, in effect moving the Reference Marker to the center of the screen.

MARKER:REFERence:

AMPlitude?

This query returns the amplitude (vertical) value of the Reference Marker in dBm when markers

e turned on (using the command MARKER:PEAK :STATE or MARKER:MANual).

MARKER:REFERence:

REQuency?

his query returns the frequency of the Reference Marker when the frequency domain

trace markers have been turned on (using either the command MARKER:P EAK:STATE or

MARKER:MANual).

MARKER:TYPe

This command speciﬁes the marker type (either DELTa or ABS olute) to use when the automatic

markers for the frequency domain traces are turned on. To turn on the automatic markers,

use the command MARKER:PE AK:STATE.

RF:CLIPPing? Returns a boolean indicating whether the RF input is “clipping” due to input over/under-range

detection.

RF:DETECTionmethod:MODe This command speciﬁes whether the R F detection within the oscilloscope occurs automatically

or manually. T he default is AUTO. If you set the detection method mode to MANual, you

are then able to use the related

RF:DETECTionmethod commands to specify detection

method options for the frequency dom ain traces (the options are

MINUSpeak, SAMple,

PLUSpeak and AVErage).

2-52 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual

Command Groups

Table 2-37: RF Commands (cont.)

Item Description

RF:DETECTionmethod:

RF_AVErage

This command speci ﬁes the detection method the oscilloscope should use when creating an

RF Average trace in the frequency domain. The Average trace displays the average of values

from multiple acquisitions at each trace point.

RF:DETECTionmethod:

RF_MAXHold

This command speci ﬁes the detection method the oscilloscope should use when creating an

RF Max Hold trace in the frequency domain. The Max Hold trace displays the largest value

in all acquisition history at each trace point.

RF:DETECTionmethod:

RF_MINHold

This command speci ﬁes the detection method the oscilloscope should use when creating an

RF Min Hold trace in the frequency domain. The Min Hold trace displays the smallest value

throughout the acquisition history at each trace point.

RF:DETECTionmethod:

RF_NORMal

This command speciﬁes the detection method the oscilloscope should u se when creating

an RF Normal trace in the frequency domain. The N ormal trace displays the m ost recently

acquired sample at each trace point.

RF:FREQuency This command speciﬁes the center frequency of the RF acquisition system. The center

frequency range varies with the model:

RF:LABel

This command speciﬁes a general label for the RF frequency domain traces.

RF:MEASUre:ACPR:

ADJACENTPAIRs

When the R F measurement type has been set to ACPR, the frequency domain displays a Main

channel in the center (Ch:Main), and a side channel group on either side of the Main Channel.

There can be either 1, 2 or 3 channels w ithin each s ide group; this command speciﬁes that

number. (Lower Area 1, 2 and 3 would be on the left side of the Main channel; Upper Area 1, 2

and 3 would be on the right side).

To set the measurement type to ACPR, use the command

RFMEASUre:TYPe ACPR.

RF:MEASUre:ACPR:CHANBW This command conﬁgures the measurement bandwidth to use for the Main channel, as well

as the adjacent side channels, when performing ACPR measurements using a frequency

domain trace. The RF measurement type must ﬁrst be set to ACPR using the command

RFMEASUre:TYPe ACPR.

RF:MEASUre:ACPR:

CHANSPACing

This command speciﬁes the center-to-center spacing between the Main channel and adjacent

channels when performing ACPR m easurements using a frequency domain trace. (The RF

measurement type must be set to ACPR using the command RF:MEASUre:TY Pe.) Note that

if the channel spacing is adjusted to be more narrow than the channel bandwidth, then the

oscilloscope will automatically decrease the channel bandwidth.

NOTE. The oscilloscope will maintain the span to ﬁt all the channels

on-screen, plus a margin of 10% (5% on either side.)

RF:MEASUre:ACPR:LA1DB? This query measures a ratio between the ﬁrst lower adjacent side channel and the Main channel

when performing ACPR m easurements. The power in the adjacent channel is equivalent to the

power in the main channel (dBm) added to the power ratio (dB) of the adjacent channel. (The

RF measurement type must be set to ACPR using the command RF:MEASUre:TYPe)

RF:MEASUre:ACPR:LA2DB?

This query measures a ratio between the second lower side channel and the Main channel

when performing ACPR measurements using a frequency domain trace. The power in the

adjacent channel is equivalent to the power in the main channel (dBm) added to the power

ratio (dB) of the adjacent channel. (The RF measurement type must be set to ACPR using

the command RF:MEASUre:TYPe)

MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-53

Command Groups

Table 2-37: RF Commands (cont.)

Item Description

RF:MEASUre:ACPR:LA3DB?

This query measures a ratio between the third lower s ide channel and the Main channel when

performing ACPR measurements using a frequency domain trace. T he power in the adjacent

channel is equivalent to the power in the mai n c hannel (dBm) added to the power ratio (dB) of

the adjacent channel. (The RF measurement type must be set to ACPR using the command

RF:MEASUre:TYPe.)

RF:MEASUre:ACPR:POWer? This query returns the m easure of the total RF power in the Main channel when performing

ACPR measurements using a frequency domain trace. It uses the units that have been

selected with the command RF:UNIts.

RF:MEASUre:ACPR:UA1DB? This query measures a ratio between the ﬁrst upper side channel and the Main channel when

performing ACPR measurements using a frequency domain trace. T he power in the adjacent

channel is equivalent to the power in the mai n c hannel (dBm) added to the power ratio (dB) of

the adjacent channel. (The RF measurement type must be set to ACPR using the command

RF:MEASUre:TYPe.)

RF:MEASUre:ACPR:UA2DB?

This query measures a ratio between the second upper side channel and the Main channel

when performing ACPR measurements using a frequency domain trace. The power in the

adjacent channel is equivalent to the power in the m ain channel (dBm) added to the power

ratio (dB) of the adjacent channel. (The RF measurement type must be set to ACPR using

the command RF:MEASUre:TYPe.)

RF:MEASUre:ACPR:UA3DB?

This query measures a ratio between the third upper side channel and the Main channel

when performing ACPR measurements using a frequency domain trace. The power in the

adjacent channel is equivalent to the power in the m ain channel (dBm) added to the power

ratio (dB) of the adjacent channel. (The RF measurement type must be set to ACPR using

the command RF:MEASUre:TYPe.)

RF:MEASUre:CP:CHANBW This command speciﬁes the c hannel bandwidth to use when the RF measurement type has

been set to Channel Power (CP) using the command RF:MEASUre:TYPe.

RF:MEASUre:CP:POWer?

This query returns the total channel power within the displayed channel bandwidth, when the

RF measurement type has been set to CP (using the command RF:MEASUre:TYPe).

RF:MEASUre:OBW:CHANBW This command speciﬁes the Analysis Bandwidth to use, when the measurement type has been

set to OBW (using the command RF:MEASUre:TYPe). Note that the span automatically

increases or decreases to be 10% more than the Analysis Bandwidth (providing some room

around the signal of interest).

RF:MEASUre:OBW:LOWERFreq? This query returns the lower frequency threshold (on the display, the white line to the left

bracketing OBW power). The RF measurement type must be set to OBW using the command

RF:MEASUre:TYPe.

RF:MEASUre:OBW:

PERCENTdown

This command speciﬁes the percentage of total power within the Analysis Bandwidth (the OB W

power) s uch that half of the remaining power will be below the OBW:LOWERFreq level and the

other half of the remaining power will be above the O BW:UPPERFreq level.

RF:MEASUre:OBW:POWer?

This query returns the total channel power within the occupied bandwidth, when the RF

measurement type has been set to OBW (using the command RF:MEASUre:TYP e).

RF:MEASUre:OBW:UPPERFreq? This query returns the upper frequency threshhold (on the d isplay, the white line to the right

bracketing OBW power). The RF measurement type must be set to OBW using the command

RF:MEASUre:TYPe.

RF:MEASUre:TYPe This command speciﬁes the RF measurement type: Channel Power, Adjacent Channel Power

Ratio, Occupied B andwidth, or none.

2-54 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual