MDO3000 Programmer Manual.pdf - 第581页
Commands Listed in Alphabetical Order Examples RF:FREQuency 3 .0E+06 sets the center frequency to 3 MHz. RF:FREQuency? might return 3.0E+06, indicating that the center frequency has been set to 3M H z . RF:LABel This com…
Commands Listed in Alphabetical Order
Arguments
PLUSpeak —Dete
ction method that selects the largest value in each interval.
MINUSpeak — Detection method that selects the smallest value in each interval.
SAMple — Detection method that selects the first point in each interval.
AVErage — Detection method that selects the mean value within an interval.
Examples
RF:DETECTionmethod:RF_NORMal SAM sets the detection method to sample.
RF:DETECTionmethod:RF_NORMal? might return AVER AGE, indicating the
detection method has been set to select the mean value within a waveform interval.
RF:FREQuency
This command specifies the center frequency of the RF acquisition system.
NOTE. For the parameters RF:STARt, RF:STOP, RF:FREQuency and RF:SPAN,
whe*TRGn any one of the parameters is changed, the following relationship
is enforced:
START = FREQ — SPAN/2
STOP = FREQ + SPAN/2
FREQ = (START + STOP)/2
SPAN = STOP — START
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:FREQuency <NR3>
RF:FREQuency?
Related Commands
RF:POSition, RF:REFLevel
Arguments
<NR3> is a floating point value.
Returns
Query response is returned in high precision NR3 format (up to 12 digits with
more than 4 trailing 0 digits after the decimal point omitted).
2-550 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
Examples
RF:FREQuency 3
.0E+06
sets the center frequency to 3 MHz.
RF:FREQuency? might return 3.0E+06, indicating that the center frequency
has been set to
3MHz.
RF:LABel
This command specifies (or queries) a label for the RF frequency domain
waveform.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:LABel <QString>
RF:LABel?
Related Commands
RF:RF_AMPlitude:LABel, RF:RF_FREQuency:LABel, RF:RF_PHASe:LABel
Arguments
<QString>isaquotedstringofupto32characters.
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 within
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
.
The Adjacent Channel Power Ratio (ACPR) is the ratio of channel power between
two user-selected channels (a side channel and a main channel).
NOTE. The oscilloscope will maintain the span to fit a ll the channels on-screen,
plus a margin of 10% (5% on either side.)
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-551
Commands Listed in Alphabetical Order
Group
RF
Syntax
RF:MEASUre:ACPR:ADJACENTPAIRs[1|2|3]
RF:MEASUre:ACPR:ADJACENTPAIRs?
Related Commands
RF:MEASUre:TYPe, RF:MEASUre:ACPR:CHANBW,RF:MEASUre:ACPR:
CHANSPACing, RF:MEASUre:ACPR:POWer?, RF:MEASUre:ACPR:LA1DB?,
RF:MEASUre:ACPR:LA2DB?, RF:MEASUre:ACPR:LA3DB?,
RF:MEASUre:ACPR:UA1DB?, RF:MEASUre:ACPR:UA2DB?,
RF:MEASUre:ACPR:UA3DB?
Examples
RF:MEASUre:ACPR:ADJACENTPAIRs 2 sets the number of adjacent pairs to
use to 2.
RF:MEASUre:ACPR:ADJACENTPAIRs? might return 3, indicating the number of
adjacent pairs has been set to 3.
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.
Note that adjusting the channel bandwidth automatically adjusts the channel
spacing. If the bandwidth is adjusted to be wider than the channel spacing, the
oscilloscope will automatically increase the channel spacing and the span.
NOTE. The oscilloscope will maintain the span to fit all the channels on-screen,
plus a margin of 10% (5% on either side.)
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:MEASUre:ACPR:CHANBW <NR3>
RF:MEASUre:ACPR:CHANBW?
Related Commands
RF:MEASUre:TYPe, RF:MEASUre:ACPR:ADJACENTPAIRs,RF:
MEASUre:ACPR:CHANSPACing, RF:MEASUre:ACPR:POWer?,
RF:MEASUre:ACPR:LA1DB?, RF:MEASUre:ACPR:LA2DB?,
2-552 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual