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Trace/Detector
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.
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.
Negative Peak
For each bucket (interval) in the trace, Negative Peak detection displays the lowest sample within the
Key Path Trace/Det, 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 Display On 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 key 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
Key Path
Trace/Det, 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 Display On 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 key 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