MDO3000 Programmer Manual.pdf - 第395页
Commands Listed in Alphabetical Order Examples MARKER:PEAK:S TATE 1 turns the automatic peak markers on. MARKER:PEAK:S TATE? might return 0, indicating tha t a utomatic peak markers are turned off. MARKER:PEAK:THReshold …
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
Commands Listed in Alphabetical Order
of the screen. T
his applies when markers are turned on (using the command
MARKER:PEAK:STATE or MARKER:MANual). This is equivalent to the 'R' to
Center side menu button in the front panel Markers menu.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
MARKER:REFERence CENTER
Examples
MARKER:REFERence CENTER moves the Reference Marker location to the center
of the screen.
MARKER:REFERence:AMPlitude? (Query Only)
This query returns the actual amplitude (vertical) value of the Reference Marker
in user-set units. This value indicates the absolute amplitude of the Reference
Marker, regardless of whether the other markers are manual or automatic.
This data is equivalent to the number that appears on the display next to the red R
inside a triangle when markers are turned on. If all markers are turned off, the
value returned will be the last value displayed.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
MARKER:REFERence:AMPlitude?
Related Commands
RF:UNIts
Examples
MARKER:REFER:AMP? might return -65.6218, indicating an amplitude value
of -65.6218 dBm.
MARKER:REFERence:FREQuency? (Query Only)
This query returns the frequency of the Reference Marker, in Hz, when
the frequency domain trace markers are on (using either the command
MARKER:PEAK:STATE or MARKER:MANual). This data is equivalent to the
2-366 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual