MDO3000 Programmer Manual.pdf - 第580页
Commands Listed in A lphabetical Order Arguments PLUSpeak —D e t e ction method that selects the la r gest value in each interval. MINUSpeak — Detection method that selects the s mallest value in each interval. SAMple — …
Commands Listed in Alphabetical Order
RF:DETECTionm
ethod:RF_MINHold?
Related Commands
RF:DETECTionmethod:MODe, RF:DETECTionmethod:RF_AVErage,
RF:DETECTionmethod:RF_MAXHold, RF:DETECTionmethod:RF_NORMal
Arguments
PLUSpeak — Detection 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_MINHold SAM changes the detection method to
sample.
RF:DETECTionmethod:RF_MINHold? might return AVERAGE, indicating the
detection method has been set to select the mean value within a waveform interval.
RF:DETECTionmethod:RF_NORMal
This command specifies the detection method the oscilloscope should use when
acquiring an RF Normal frequency domain trace. The Normal trace displays the
most recently acquired sample at each trace point. .
In order to change the detection method, you must first change the detection
method mode to
MANUAL using the command RF:DETECTionmethod:MODe.
The detection method is the internal calculation that decimates (reduces)a
long frequency domain waveform down to display resolution, by dividing the
waveform into intervals and choosing a single value to represent each interval
on screen.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:DETECTionmethod:RF_NORMal
{PLUSpeak|MINUSpeak|SAMple|AVErage}
RF:DETECTionmethod:RF_NORMal?
Related Commands
RF:DETECTionmethod:MODe, RF:DETECTionmethod:RF_AVErage,
RF:DETECTionmethod:RF_MAXHold, RF:DETECTionmethod:RF_MINHold
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-549
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