MDO3000 Programmer Manual.pdf - 第392页

Commands Listed in A lphabetical Order MARKER:M<x>: NOISEDensity? (Query Only) This command returns the noise density of the R F_NORMal trace at the specifi ed marker position in <RF Units>/Hz units , where &l…

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Commands Listed in Alphabetical Order
Related Commands
MARKER:MANual
, MARKER:M<x>:AMPLitude:ABSolute?,
MARKER:M<x>:AMPLitude:DELTa?, MARKER:M<x>:FREQuency:DELTa?
Arguments
<NR3> isafloa
ting point value that indicates the actual frequency of either of the
two manual markers.
Examples
MARKER:M1:FREQuency:ABSolute 1.50E+9 sets the absolute frequency
value of manual marker a to 1.5 GHz.
MARKER:M2:FREQuency:ABSolute? might return 1.50E+9, indicating that the
absolute frequency value of manual marker b has been set to 1.5 GHz.
MARKER:M<x>:FREQuency:DELTa? (Query Only)
This query returns the delta frequency (horizontal) value of either of the two
manual markers that are available for frequency domain traces, in relationtothe
Reference Marker. M<x> can be either M1, which specifies manual marker a,or
M2, which specifies manual marker b.
The manual marker readouts use the units specified with the command RF:UNIts.
NOTE. Querying the delta of M1 will always return 0, because M1 is always the
Reference Marker when manual markers are turned on.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
MARKER:M<x>:FREQuency:DELTa?
Related Commands
MARKER:MANual, MARKER:M<x>:AMPLitude:ABSolute?,
MARKER:M<x>:AMPLitude:DELTa?, MARKER:M<x>:FREQuency:ABSolute
Examples
MARKER:M2:FREQuency:DELTa? might return 1.00E+08, indicating that marker
b is 100 MHz to the right of the Reference Marker.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-361
Commands Listed in Alphabetical Order
MARKER:M<x>:
NOISEDensity? (Query Only)
This command 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 comman
d RF:UNIts.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
MARKER:M<x>:NOISEDensity?
Related Commands
MARKER:MANual, MARKER:M<x>:PHASENoise?
Returns
floating point number
Examples
MARKER:M2:NOISEDensity? might return –133.2350, indicating noise density
of –133.2350 dBm/Hz at the marker position.
MARKER:M<x>:PHASENoise? (Query Only)
This command returns the phase noise of the RF_NORMal trace at the specified
marker position in dBc/Hz units.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
MARKER:M<x>:PHASENoise?
Related Commands
MARKER:MANual, MARKER:M<x>:NOISEDensity?
Returns
floating point number
Examples
MARKER:M2:PHASENoise? might return –60.1289, indicating phase noise of
–60.1289 dBc/Hz at the marker position.
2-362 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
MARKER:PEAK:
EXCURsion
This command specifies the peak excursion value, in dB, for the frequency
domain trace automatic peak markers.
Peak excursion refers to how far an RF signal needs to fall in amplitude between
marked peaks, in order to be considered another valid peak. If the peak excursion
value is low
, more peaks will tend to qualify as valid peaks and have associated
markers. If the peak excursion value is high, fewer peaks will tend to qualify as
valid peaks and have associated markers.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
MARKER:PEAK:EXCURsion <NR3>
MARKER:PEAK:EXCURsion?
Related Commands
MARKER:PEAK:THReshold, MARKER:TYPe, MARKER:PEAK:STATE
MARKER:PEAK:MAXimum
Arguments
<NR3> is a floating point number that specifies the automatic marker excursion
value.
Examples
MARKER:PEAK:EXCURsion 30 sets the peak excursion value to 30 dB.
MARKER:PEAK:EXCURsion? might return 30.0000, indicating a peak excursion
value of 30 dB.
MARKER:PEAK:MAXimum
This command specifies the maximum number of frequency domain trace peaks
that could have automatic markers placed on them. This can be a number
between 1 and 11. The default is 5. To turn on the automatic peak markers, use
the command MARKER:PEAK:STATE. To list all of the peak markers, use the
command SEARCH:SPECTral:LIST?
The actual number of automatic markers may be less than the maximum,
depending on the threshold and excursion values and the spectral content ofthe
RF signal.
If more peaks than the maximum are detected that meet the threshold and
excursion criteria, only the highest amplitude peaks will have automatic markers
placed on them.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-363