Several detection methods tailor the performance of the instrument to meet specific measurement requirements. In general, several measurement points are calculated for each display point. The various detection methods are different ways of dealing with how measurement point data is shown at each display point.
Peak: This method causes the largest measurement point to be shown for each display point, and assures that a narrow peak is not missed.
RMS/Avg: This method performs a root‑mean‑square calculation of all the measurement points in each display point. This is particularly useful in displaying the average value of noise or noise‑like signals.
Negative: This method causes the smallest measurement point to be shown for each display point. Typically this mode is used to help detect small discrete signals in the presence of nearly equal values of noise. The display points that contain only noise will tend to show lower amplitudes than those that contain discrete signals.
Sample: This is the fastest detection method because for each display point, only one frequency point is measured. Use this method when speed is of paramount importance and the possibility of missing a narrow peak is not important.
Quasi‑peak: When this selection is made resolution bandwidths and video bandwidths of 200 Hz, 9 kHz and 120 kHz are available. This detection method is designed to meet CISPR requirements.
The key sequence to set a detection method is: Amplitude > Detection.