Tektronix MSO46 — обзор элементов управления спектром и типов трасс [177/628]

Spectrum trace handle and trace types

The spectrum trace handle provides details on the trace reference level, the source channel for the trace, and which trace types

are displayed and selected.

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

Figure 19: The Spectrum View trace handle elements

1. The trace's source channel (at top of the handle) and trace reference level (top edge of the handle, with dashed line

extending across the screen). Spectrum View shows the spectrum traces relative to a Reference Level reference point. The

color of the handle is the same as the source channel.

If the Reference level is outside of the displayed trace (above or below the graticule), the handle is drawn with the channel

source text pointing toward the Reference level.

2. A capital M indicates that the maximum trace is enabled. If the maximum trace is not enabled, this letter is not shown.

3. A capital A indicates that the average trace is enabled. If the average trace is not enabled, this letter is not shown.

4. A capital N indicates that the normal trace is enabled. If the normal trace is not enabled, this letter is not shown.

5. A small m indicates that the minimum trace is enabled. If the maximum trace is not enabled, this letter is not shown.

The above image shows all traces enabled and the A (Average) trace selected. Highlighting around a letter indicates that that

trace type is selected.

Trace handle and trace type guidelines

There are important distinctions between enabled (displayed) and selected traces:

■

An enabled trace is a trace type that is enabled in the Spectrum View panel of the source channel badge and is shown in

the spectrum view window. If the trace type is not enabled, its corresponding letter is not shown in the trace handle and

there is no corresponding trace shown on the screen.

■

A selected trace (highlighted around the letter) is the trace that is used for marker and cursor readouts. Only one trace type

can be selected at a time. Double-tap the trace handle to change the selected trace type.

■

You can enable and display any combination of trace types for each spectrum trace.

■

Disabling all trace types causes the spectrum view for that channel to close.

■

If there is only one spectrum trace shown in the Spectrum View, and you disable all trace types or turn off the spectrum

function for that channel, the Spectrum View window closes.

Using Spectrum View

4/5/6 Series MSO Help 147