User Manual

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The Spectrum Application (RF Measurements)

R&S

FPL1000

437User Manual 1178.3370.02 ─ 09

File contents Description

XAxisUnit;FREQ_HZ Unit of x values

XAxisScaleMode;ABSOLUTE Scaling of x-axis (absolute or relative)

YAxisUnit;LEVEL_DB Unit of y values

YAxisScaleMode;ABSOLUTE Scaling of y-axis (absolute or relative)

NoOfPoints;5 Number of points the line is defined by

Data section for individual data points

-4500000000;-50 x- and y-values of each data point defining the line

-2000000000;-30

-1000000000;0

0;-30

2500000000;-50

7.12 Zoomed Displays

You can zoom into the diagram to visualize the measurement results in greater detail.

Using the touchscreen or a mouse pointer you can easily define the area to be

enlarged.

Graphical Zoom Versus Measurement Zoom

Graphical zooming is merely a visual tool, it does not change any measurement set-

tings, such as the number of sweep points, the frequency range, or the reference level.

Graphical zooming only changes the resolution of the displayed trace points tempora-

rily. You must explicitly activate the graphical zoom function (see Chapter 7.12.2,

"Zoom Functions", on page 439).

Graphical zoom and the number of sweep points

Note that (graphical) zooming is merely a visual tool, it does not change any measure-

ment settings, such as the number of sweep points!

You should increase the number of sweep points before zooming, as otherwise the res-

olution of the trace in the zoomed region is poor (see Chapter 7.6.1.8, "How Much Data

is Measured: Sweep Points and Sweep Count", on page 321).

When you change the display using touch gestures, however, the corresponding mea-

surement settings are adapted (see also Chapter 5.4.4, "Touchscreen Gestures",

on page 74). For example, dragging horizontally in a spectrum display changes the

center frequency. Dragging vertically in a spectrum display changes the reference level

(for absolute scaling). These changes are permanent for the measurement. This

behavior is also referred to as measurement zoom, and is active by default in the new

R&S FPL1000.However, you can also activate it manually for a display that has

Zoomed Displays