Agilent Technologies Signal Analyzer N9030a - Manual (Page 1354)

6 RLC Swept SA Measurement Front-Panel & SCPI Reference
Trace/Detector
Peak detection is used for CW measurements and some pulsed-RF measurements. For FFT
analysis, the highest amplitude across the frequency width of a bucket is displayed, even if that
peak amplitude falls between samples of the spectrum computed in the FFT process.
Key Path Trace/Detector, Detector
Example DET:TRAC2 POS Sets the detector to peak for trace 2.
Couplings Selecting a specific detector type turns “Auto” to false for this trace (manual).
Selecting a detector for a trace (pressing the key or sending a [:SENS]:DET:TRAC command) puts
Update On and DisplayOn for that trace, even if that detector was already selected. Note that
the legacy command [:SENS]:DET[:FUNC] does NOT exhibit this behavior.
Selecting a detector, whether by pressing the softkey or sending the equivalent SCPI command,
will turn trace math to Off for the selected/specified trace.
Initial S/W Revision Prior to A.02.00
Sample
The sample detector displays the instantaneous level of the signal at the center of the bucket
(interval) represented by each trace point.
Sample detection is good for displaying noise or noise-like signals.
Sample detection is not the best for making amplitude measurements of CW-like signals for two
reasons. First, the peak response to a signal can occur between samples. So unless the Span to
RBW ratio is lower than usual, then the highest sample can be well below the peak signal
amplitude. Second, for the high sweep rates normally used, the peak response of the RBW filters
is up to –0.5 dB. This sweeping error is compensated when using the peak and normal detectors
by changing the overall gain. But the gain is not changed when in the sample detector, because
doing so would cause errors in the response to noise. Instead, the auto-couple rules for sweep
time are modified to give slower sweeps.
Key Path Trace/Detector, Detector
Example DET:TRAC SAMP Selects the Sample detector for trace 1.
Couplings Selecting a specific detector type turns “Auto” to false for this trace (manual).
Selecting a detector for a trace (pressing the key or sending a [:SENS]:DET:TRAC command) puts
Update On and DisplayOn for that trace, even if that detector was already selected. Note that
the legacy command [:SENS]:DET[:FUNC] does NOT exhibit this behavior.
Selecting a detector, whether by pressing the softkey or sending the equivalent SCPI command,
will turn trace math to Off for the selected/specified trace.
Initial S/W Revision Prior to A.02.00
1354 Remote Language Compatibility Measurement Application Reference