MDO3000 Programmer Manual.pdf - 第396页
Commands Listed in A lphabetical Order of the screen. T his applies when markers are turned on (using the command MARKER:PEAK:ST A TE or MARKER:MANual ). This is equivalent to the 'R' to Center side menu button…
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
Commands Listed in Alphabetical Order
number that app
ears on the display next to the red R inside a triangle when markers
areon. If all markers are 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:FREQuency?
Examples
MARKER:REFERence:FREQuency? might return 1.6830E+9.
MARKER:TYPe
This command specifies the marker type (either DELTa or ABSolute). An absolute
marker shows the frequency and amplitude at the location of the marker. A delta
marker shows the frequency and amplitude of the marker relative to the Reference
Marker. The Reference Marker shows the absolute frequency and amplitude,
regardless of this command. The marker amplitude measurements are in dBm for
absolute, or in dBc (dB below carrier amplitude) for delta.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
MARKER:TYPe {DELTa|ABSo lute}
MARKER:TYPe?
Related Commands
MARKER:PEAK:STATE, MARKER:PEAK:MAXimum, RF:UNIts
Arguments
DELTa specifies to display the frequency and amplitude of the markers relative
to the Reference Marker. The relative amplitude is in dBc (dB below carrier
amplitude); the relative frequency is in Hz.
ABSolute specifies to display the actual frequency and amplitude of each marker.
The absolute amplitude is in user-set units; the absolute frequency is in Hz.
Examples
MARKER:TYPe DELta changes the marker type to delta.
MARKER:TYPe? might return ABSOLUTE.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-367