Tektronix MSO46 — автоматические маркеры пиков в спектре для анализа сигналов [178/628]

Spectrum peak markers

Automatic peak markers assist with quickly identifying the frequency and amplitude of peaks in the spectrum trace. Access the

marker settings by double-tapping in a spectrum trace slice window (Stacked mode) or trace (Overlay mode) to open the

Spectrum View menu.

NOTE. Spectrum View is standard in 5/6 Series MSO instruments. Spectrum View is an option in 4 Series MSO instruments.

Figure 20: The spectrum peak markers

1. The highest peak shown is considered the Reference peak, and is labeled with a red Reference marker triangle. The

Reference marker readout (also in red) always shows the absolute amplitude and frequency of that peak, regardless of the

Readout type setting (Absolute or Delta).

2. The Automatic peak markers are hollow white triangles that mark the next highest peaks in the trace, depending on the

marker parameters.

3. Absolute readouts on markers show the actual frequency and amplitude values of the marked peaks of the selected trace.

4. Delta readouts on Automatic markers show the delta frequency and delta amplitude of the marked peaks, of the selected

trace, relative to the Reference marker readout.

Marker parameters

To set marker parameters, double-tap in the Spectrum View window and tap the Markers panel (see Spectrum View window

configuration menu on page 422). Marker parameters include:

■

Turning marker display On or Off.

■

The number of markers to display (1 to 11). Selecting 1 shows just the Reference marker.

■

The peak Threshold value, which is the minimum absolute peak level that peaks must equal or exceed to display a mark on

that peak.

■

The peak Excursion value, which is the minimum magnitude (excursion range) that peaks must equal or exceed to display

a mark on a peak.

■

The type of readout values to display (Absolute or Delta).

Using Spectrum View

148 4/5/6 Series MSO Help