© 2008 Jackson-Labs
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FireFox Synthesizer User Manual
: DWELl <numeric value>
: POINTs <numeric value>
:TIME <numeric value>
:STEP?
:GENeration <ANALog | STEPped>
: SPACing <LINear | LOGarithmic>
: DIRection <UP | DOWN| UPDOWN>
:COUNt <numeric value>
This command controls the Frequency sweep functionality of the FireFox. The RF output power is
leveled during frequency sweeping, and the output level is set by the power command described in
Section
2.5.3.1
. Leveling the RF output power allows the frequency sweeping mode to be used to
measure frequency responses of filters, amplifiers, cables, etc. with a very high level of accuracy.
FireFox sweeps can also be used with Spectrum Analyzers and Directional Couplers to provide full
Network Analyzer functionality.
2.5.2.2 [SOURce]:SWEep:MODE <HW | SW>
This command selects between the Software-Controlled sweeping mode and the
Hardware-Controlled sweeping mode.
Sweeps will affect the LVDS, CMOS, and RF outputs of the FireFox simultaneously.
In the Software-Controlled sweeping mode the microcontroller controls the frequency of the DDS
and changes it incrementally at high speed thereby sweeping the output frequency between the Start
and Stop frequencies. This mode has the advantage that the RF level of the output is calibrated
throughout the sweep. Sweeping in software mode is available throughout the entire FireFox
frequency range [0Hz to 1640MHz]
The Hardware-Controlled mode uses the DDS circuitry directly by automatically incrementing
hardware counters inside the DDS chips. This mode allows extremely fast sweeps with frequency
update rates of up to 125Mupdates/s with a limited frequency range of [2Mhz to 390Mhz]. The
output RF power is not calibrated in HW sweep mode.
Upon *RST, the Sweep MODE is set to SW
2.5.2.3 [SOURce]:SWEep:DWELl <numeric value>
This command controls the amount of time in seconds spent at each point during a sweep.
In Software-Controlled sweeping mode, this value must be in the range [0.001, 1000 ] with a
resolution of 0.001 s.
Summary of Contents for FireFox
Page 1: ...FireFox Synthesizer User Manual Document 0012008 Version 004 Date 10 April 2008...
Page 2: ...FireFox Synthesizer User Manual Copyright 2008 Jackson Labs...
Page 34: ...FireFox Synthesizer User Manual 28 2006 Jackson Labs...
Page 46: ...FireFox Synthesizer User Manual 40 2008 Jackson Labs SOURce POWer...
