MDO3000 Programmer Manual.pdf - 第84页
Command Groups T able 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 fre…
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
Command Groups
Table 2-37: RF Commands (cont.)
Item Description
RF:POSition This command specifies the vertical position for the frequency domain traces. The vertical
position is the location of the Reference Level with respect to the top of the graticule, in
divisions. T he lower limit is –10 divisions. The upper limit is +10 divisions.
RF:PRObe:AUTOZero This command executes the attached probe’s AutoZero function, for probes that support
this feature.
RF:PRObe:CALibrate This command executes a c alibration or initialization for a probe attached to the RF input, if
the probe is calibratable.
RF:PRObe:CALibrate:
CALIBRATABLe?
This query returns a boolean value that indicates whether the attached probe is calibratable.
RF:PRObe:CALibrate:STATE? This command returns the calibration state of the probe connected to the RF input.
RF:PRObe:COMMAND This command sets the state of the probe control speci fied with the first argument to the
state specified with the second argument.
RF:PRObe:DEG AUss This command starts a degauss/AutoZero cycle on a TekVPI current probe attached to the
RF input.
RF:PRObe:DEGAUss:STATE? This command returns the state of the probe degauss for the RF input.
RF:PRObe:FORCEDRange This command specifies the range of a TekVPI probe attached to the RF input.
RF:PRObe:GAIN This command specifies the scale factor for the probe attached to the RF input.
RF:PRObe:ID:SERnumber? This query returns the serial number of the probe attached to the RF input.
RF:PRObe:ID:TYPe? This query returns the type of probe attached to the RF input.
RF:PRObe:PREAmp:MO De Sets o r returns the user selected mode for an RF pre-amp connected to the RF input. BYPass
or AUTO
RF:PRObe:PREAmp:STATus? Returns the actual state of the RF pre-amp connected to the RF input. NONe, ON,orBYPass
RF:PRObe:RESistance? This query returns the input resistance of the probe attached to the RF input, if the probe
supports it (otherwise, it returns 0.0). The RF input is 50 Ω impedance.
RF:PRObe:SIGnal This command specifies the input bypass setting of a TekVPI probe attached to the RF input.
The probe must support input bypass.
RF:PRObe:UN Its? This query returns a quoted string that describes the units of measure for the probe attached
to the RF input.
RF:RBW
This command specifies the resolution bandwidth (RBW) setting when the RBW mode has
been set to MANUAL (using the command RF:R BW:MODe). The resolution bandwidth is the
width of the narrowest measurable band of frequencies in a frequency domain trace. T he RBW
is adjustable down to 20Hz. By default, the RBW tracks the span value in a 1000:1 ratio.
RF:RBW:MODe This command specifies the resolution bandwidth (RBW) m ode, either automatic or manual.
RF:REFLevel
This command sets the Reference Level of the RF input. The Reference Level can e ither be
specified as a numeric floating point value, or set automatically.
RF:RF_AMPlitude:LABel
This command specifies the label for the RF Amplitude vs. Time trace.
RF:RF_AMPlitude:VERTical:
POSition
This command specifies the vertical position of the RF Amplitude vs. Time trace. The position
value determines the vertical graticule location at which the trace is displayed. Increasing the
position value of a waveform causes the waveform to move up. Decreasing the position value
causes the waveform to move down. The m in imum is -50 divisions and the maximum is
50 divisions with a resolution of 0.02 divisions.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-55