Command Groups
Table 2-37: RF Commands (cont.)
Item Description
RF:DETECTionmethod:
RF_AVErage
This command specifies 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 specifies 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 specifies 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 use when creating
an RF Normal trace in the frequency domain. The Normal trace displays the most 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 RF 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 side 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 confi gures the measurement bandwidth to use for the Main channel, as w ell
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 measurements using a frequency domain trace. (The RF
measurement type must be set to ACPR using the command RF:MEASUre:TYPe.) 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 measurements. 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 m easures 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
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