Agilent Technologies Signal Analyzer N9030a - Manual (Page 753)

6 RLC Swept SA Measurement Front-Panel & SCPI Reference
Marker Function
Name Detector
Normal Normal
Peak Peak
Sample Sample
Neg Peak Negative Peak
RMS Average detector with Power Average (RMS)
Log Avg Average detector with Log-Pwr Average
VoltageAvg Average detector with Voltage Average
Quasi Peak Quasi Peak
EMI Avg EMI Average
RMS Avg RMS Average
The marker frequency is shown in the “Freq” field. The measured value is shown for all detectors
except those that are “Off.” For these, --- is displayed. The current Y-Axis unit is used, and the
precision that is used for the detector value displays is exactly the same as for the Marker. The
precision used for the Frequency display is six significant digits.
The sequence of steps in the measurement is as follows:
•
Any sweep in progress is aborted.
•
If in Zero Span, the Center Frequency is used as the frequency at which to take the reading,
since in Zero Span, all markers are by definition at the Center Frequency
•
If not in Zero Span:
−
If the selected marker is Off, it is first turned on in the center of the screen and a peak search
performed.
−
If the selected marker is on, but offscreen, it is first moved to the center of the screen and a
peak search performed. .
−
A frequency “zoom” function is performed to determine the frequency of the selected marker
to the required precision. If you are operating with too large a value of (span/sweep points)
then the Measure at Marker window will not display, but instead an advisory message, “Span
per point too large, narrow span or increase RBW or number of points”.This means you have
chosen a combination of RBW, span and sweep points that makes each trace point much
wider than the RBW, so that the trace point in which the signal appears is an inadequately
precise measure of its frequency—for example, with a 30 MHz to 1000 MHz span, 601 trace
points and 120 kHz RBW, each trace point is 13 times as wide as the RBW. In this case, a
SCPI query of the results will yield –999 dBm for each detector.
−
If the zoom is successful, the analyzer goes to zero span at this frequency.
Remote Language Compatibility Measurement Application Reference 753