226 Chapter 2
One-Button Measurement Functions
Meas Setup (Spurious Emissions)
One-Button Measurement Functions
Remote Command:
See “Detector 2” on page 224.
2.24.3.13.3 Peak PSA Only: For each interval (bucket) in the trace, Peak detection
displays the highest amplitude within the interval. Peak detection is used for CW
measurements and some pulsed-RF measurements. For swept analysis, peak detection
basically obtains the maximum video signal between the end of the last bucket and the
start of the next one. Gain is increased to compensate for the effects of faster sweep rates,
to keep the displayed value accurate. For FFT analysis, the highest spectral amplitude is
displayed, even if that peak amplitude falls between samples of the spectrum computed in
the FFT process.
When Peak is selected, Peak appears on the left side of the display.
Key Path: Meas Setup, Range Table, Detector 1 or Detector 2
State Saved: Saved in instrument state.
History: Added with PSA firmware revision A.06.00
Remote Command:
See “Detector 2” on page 224.
2.24.3.13.4 Sample PSA Only: The sample detector displays the instantaneous level of
the signal at the center of the interval (bucket) represented by each trace point.
Sample detection is primarily used to display noise or noise-like signals.
Sample detection is not best for 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, 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 to do so would cause errors in the response to noise.
When Sample is selected, Samp appears on the left side of the display.
Key Path: Meas Setup, Range Table, Detector 1 or Detector 2
State Saved: Saved in instrument state.
History: Added with PSA firmware revision A.06.00
Remote Command:
See “Detector 2” on page 224.