MDO3000 Programmer Manual.pdf - 第394页
Commands Listed in A lphabetical Order Group RF Syntax MARKER:PEAK:M AXimum <NR1> MARKER:PEAK:M AXimum? Related Commands MARKER:PEAK:ST A TE , MARKER:PEAK:EXCURsion , MARKER:PEAK: THRes hold , MARKER:TYPe , Argumen…
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
Commands Listed in Alphabetical Order
Group
RF
Syntax
MARKER:PEAK:MAXimum <NR1>
MARKER:PEAK:MAXimum?
Related Commands
MARKER:PEAK:STATE, MARKER:PEAK:EXCURsion, MARKER:PEAK:
THReshold, MARKER:TYPe,
Arguments
<NR1> is an integer that represents the maximum number of peaks that could
have automatic markers.
Examples
MARKER:PEAK:MAXimum 3 sets the maximum number of peaks that could have
automatic markers to 3.
MARKER:PEAK:MAXimum? might return 11, indicating that the maximum number
of peaks that should have automatic markers has been set to 11.
MARKER:PEAK:STATE
This command switches on or off the automatic peak markers that are available for
frequency domain traces. There are up to 11 automatic markers. The maximum
number of markers can be set using the command MARKER:PEAK:MAXimum.
The automatic peak markers find amplitude peaks based upon user threshold
and excursion settings (set with the MARKER:PEAK:EXCURsion and
MARKER:PEAK:THReshold commands.)
Each automatic marker has a readout associated with it. These can be absolute or
delta readouts (set with the MARKER:TYPe command.) To list all of the peak
markers, use the command SEARCH:SPECTral:LIST?
Group
RF
Syntax
MARKER:PEAK:STATE {OFF|ON|0|1}
MARKER:PEAK:STATE?
Related Commands
MARKER:PEAK:MAXimum, MARKER:PEAK:EXCURsion,
MARKER:PEAK:THReshold, MARKER:TYPe
Arguments
OFF or 0 turns the automatic peak markers off.
ON or 1 t
urns the automatic peak markers on.
2-364 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
Examples
MARKER:PEAK:S
TATE 1
turns the automatic peak markers on.
MARKER:PEAK:STATE? might return 0, indicating that automatic peak markers
are turned off.
MARKER:PEAK:THReshold
This command specifies the threshold value of the automatic peak markers
available for frequency domain traces. (Use the RF:UNIts command to
specify
the units.) Only peaks with an amplitude greater than the threshold value will
qualify for automatic peak marker placement.
To set the excursion value for the automatic markers, use the command
MARKER:PEAK:EXCURsion. To switch the automatic marker readout between
absolute and delta, use the command MARKER:TYPe. Toturnonandsetthe
number of automatic markers, use the commands MARKER:PEAK:STATE and
MARKER:PEAK:MAXimum. To list all of the peak markers, use the command
SEARCH:SPECTral:LIST?
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
MARKER:PEAK:THReshold <NR3>
MARKER:PEAK:THReshold?
Related Commands
MARKER:PEAK:EXCURsion, MARKER:TYPe, MARKER:PEAK:STATE,
MARKER:PEAK:MAXimum
Arguments
<NR3> is a floating point number that indicates the automatic marker threshold
value.
Examples
MARKER:PEAK:THReshold –50 sets the automatic marker threshold to
–50 dBm.
MARKER:PEAK:THReshold? might return –50.000, i
ndicating that only peaks
with an amplitude greater than –50 dBm will qualify for automatic peak marker
placement.
MARKER:REFERence (No Query Form)
This command changes the Center Frequency to the frequency indicated by
the Reference Marker, in effect moving the Reference Marker to the center
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-365