Jackson Labs FireFox, Руководство пользователя

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© 2008 Jackson-Labs 31
FireFox Synthesizer User Manual
OPER?
This command is the query of the OPERation status register. Only bit3 (Sweeping) is actually
currently managed. All the other bits are set to zero.
2.5.1 Frequency Subsystem
The FireFox Signal Generator has two output operating modes: Continuous Wave (CW) and
Sweeping Mode. The Frequency sub-system gives the user the capability to program the front-panel
static output frequency when the unit is in Continuous Wave (CW) mode, and allows the selection of
sweep parameters when in sweep mode. In sweep mode, the unit may generate a frequency sweep
between any two arbitrary frequencies ranging from 0Hz to 1640MHz.
Two commands exist to control frequency sweeping:
SOURCE:FREQUENCY and
SOURCE:SWEEP
2.5.1.1 [SOURce]:FREQuency
The supported options are:
•
[:CW|:FIXed] <numeric_value> <unit>
•
:MODE <CW|FIXed|SWEep>
•
:CENTer <numeric_value> <unit>
•
:SPAN <numeric_value> <unit>
•
:STARt <numeric_value> <unit>
•
:STOP <numeric_value> <unit>
2.5.1.1.1 [SOURce]:FREQuency:CW
The Continuous Wave or FIXed node is used to select a single output frequency. This node is
optional. The units supported are “Ghz”, “Mhz”, “Khz”, “Hz”, “uHz”.
By default, when no units are specified, the value is considered to be in Hertz.
If the output state is turned on as described in section
2.5.5.1 and the frequency mode is CW, the
frequency output will be changed immediately upon reception of the command.
This command is an alias of the command FIXed.
2.5.1.1.2 [SOURce]:FREQuency:MODE
This command changes the FireFox mode. Only two modes are supported: Sweep or CW. The FIXed
mode is an alias of the CW mode.
2.5.1.1.3 [SOURce]:FREQuency:CENTer <numeric_value>
This command sets the Center frequency. The change of this value will affect Start and Stop
frequency in the following way:
•
Start = Center – Span/2
•
Stop = Span/2