User guide

Time Domain (Zero Span)

In Time Domain, the amplitude of a single frequency is measured, rather than

sweeping a range of frequencies. The SignalHawk measures and displays the ampli-

tude of the frequency for a specified period (sweep time) and refreshes during the

next sweep. The Time Domain trace resembles the horizontal line display on an

oscilloscope.

Note: The center frequency will be measured.

1. Activate the measurement by doing one of the following:

 Select Time Domain from the Spectrum Analyzer section of the Start

Menu.

 Select Time Domain, in the Measurement Menu, then, in the Time

Domain submenu, press the Time Domain button (soft key 1) to turn

on the measurement.

 Set the Frequency Span to 0 Hz. See “Freq & Span Menu” on page 58.

2. Press the Sweep Time soft key and enter how long a single sweep should be

using one of these methods:

Note: Time range can be set from 1 ms to 100 s.

 Up/Down Arrows: Step increments of one second.

 Right/Left Arrows: Step increments of one millisecond.

 Thumbwheel: Step increments of one second per click.

 Keypad: Enter the time in seconds.

Note: There are a limited number of pixels, so longer sweep times

mean less detail in the display.

Note: This enables the Video Trigger in the BW & Sweep menu. To use the

Video Trigger, see “Video BW” on page 63.

Figure 75 Example, Time Domain

STEP 1

Measurement

Settings

STEP 2