User Manual

Page 15

4.1.5 Frequency Presets

enables up to six frequency ranges to be quickly stored and recalled. Only the

centre and span (or equivalent start and stop frequencies) are stored. This differs

from a Trace State or Set-up file for which more parameters are stored (see sections

5.7.1 or 5.7.3 respectively). Frequency presets are retained when the instrument is off.

Creates a set of bottom-row function keys as follows:

sets the sweep to the full range of the instrument (1MHz to 2.7GHz or 1.3GHz).

brings up a menu of six preset numbers (1 to 6) into which the current value of the

sweep frequency range can be stored. Existing values are over-written.

brings up a menu of six preset numbers (1 to 6) which recall previously stored

frequency ranges. Empty positions are ignored.

switches between the current sweep frequency range and the last range to be

recalled from a preset (or from Full Span).

4.2 Sweep Time

The sweep time and update rate is automatically set from the Span and the RBW and is

displayed within the lower annotation area. There is no independent adjustment of sweep time.

Narrower RBW settings create longer sweep times. For each RBW, the sweep time in broadly

proportional to the frequency span. The approximate formula for calculating sweep update

times is given within the specifications – see section 12.1.4.

4.3 Zero Span Mode

Zero span is a special case of frequency range setting. It is set from the Span sub-menu - see

section 4.1.2. Pressing changes the trace display to be a horizontal line at the

centre frequency amplitude level, and brings up an alternative set of function keys as follows:

exits zero span mode and returns to a normal swept trace and the normal Span sub-

menu key functions.

brings up a menu which enables the demodulation mode to be set to AM or FM (or

Off) and the Audio Filter to be set to On or Off.

adjusts the demodulated audio volume (0 to15).

The demodulated audio is routed to a built-in loudspeaker. Alternatively, the audio can be

outputted via a 3.5mm jack socket - see section 3.1.3.

Freq

Presets

Full

Span

Recall

Preset

Toggle

Last

Exit

Z-Span

Demod

Volume

Down

Volume

Store

Preset