Agilent Technologies Signal Analyzer N9030a - Manual (Page 741)

6 RLC Swept SA Measurement Front-Panel & SCPI Reference
Marker Function
CALC:MARK:Y? returns the y-axis value of the Marker Noise function for marker 1 (if Marker
Noise is ON for marker 1). Note that the delta value when the Y axis unit is Watt is the square of
the delta value when the Y axis unit is Volt. For example, when the percent ratio with Y axis unit
in Volt is 0.2, the percent ratio with Y axis unit in Watt will be 0.22 = 0.04. When you read the
value out remotely you have to know whether your Y Axis Unit is log (dB), linear (V or A), or
power (W).
Notes See the description under the “ "Marker Function" on page 729 ” key.
Dependencies Fixed markers: It is not possible to change the Band Function for a Fixed marker; so all of the
Band Function keys are grayed out for a Fixed marker.
Couplings Average detector and Power Averaging auto selected when Marker Noise on
If the selected (specified) marker is off, selecting Marker Noise via front panel or SCPI will turn
the marker on.
Initial S/W Revision Prior to A.02.00
More Information
To guarantee accurate data for noise-like signals, a correction for equivalent noise bandwidth is
made by the analyzer. The Marker Noise function accuracy is best when the detector is set to
Average or Sample, because neither of these detectors will peak-bias the noise. The tradeoff
between sweep time and variance of the result is best when Average Type is set to Power
Averaging. Therefore, Auto coupling chooses the Average detector and Power Averaging when
Marker Noise is on. Though the Marker Noise function works with all settings of detector and
Average Type, using the positive or negative peak detector gives less accurate measurement
results.
Off-trace Markers
If a Normal or Delta noise marker is so near to the left or right edge of the trace that some of the
band is off the trace, then it uses only that subset of the Band Width that is on-trace. If the
marker itself is off-trace, its value becomes undefined.
Neither band/interval power nor band/interval density markers are defined if any part of the
band is off-trace (unless they are Fixed with a stored function value in them), except that when
the edges of the bandwidth are trivially off-screen, due to mathematical limitations in the analyzer
or in the controlling computer, the result will still be considered valid.
Band/Interval Power
Turns on the Band/Interval Power function for the selected marker. If the selected marker is off it
is turned on in Normal marker and located at the center of the screen.
Remote Language Compatibility Measurement Application Reference 741