2500A Chapter 3: Remote Operation
72 2500A Series Operation Manual, 34172 Revision C, March 2008
Queries. Most SCPI commands have an accompanying query form that can be sent in order to cause the
instrument to return the current state of the parameter setting. For example, the query form of the TRIG-
ger:SOURce BUS|EXTernal command is TRIGger:SOURce?
Some SCPI commands are events that cause something to happen at a particular time but do not create a
setting or value to be checked afterwards. Consequently, they have no query form.
3.2.2 SCPI Command Subsystems
SCPI commands are divided into subsystems. The following subsystems are used in the 2500A:
3.2.2.1 Output Subsystem
Table 3-4: Output Subsystem SCPI Commands
3.2.2.2 Source Subsystem - CW Mode
All commands in the Source subsystem begin with [SOURce], however, [SOURce] is the default com-
mand, therefore it is optional.
Command Syntax Description
OUTPut[:STATe] ON|OFF|1|0 Turns the signal at the RF OUT connector on and off
OUTPut[:STATe]? Queries the RF OUTPUT state. The return value is as follows:
1 The signal at the RF OUT connector is currently on.
0 The signal at the RF OUT connector is currently off.
Table 3-5: Source Subsystem - CW Mode SCPI Commands
Command Syntax Description
[SOURce]:FREQuency[:CW|:FIXed] <freq>
[HZ
| KHZ | MHZ | GHZ]
Sets CW frequency to the value specified by <freq>. The units
are assumed to be in Hertz if no units designator is supplied.
[SOURce]:FREQuency[:CW|:FIXed]? Queries the current CW frequency. The value returned is in Hz.
[SOURce]:MODE CW|FIXed|LIST|FSWEep
|PSWEep
Sets the operational mode of the synthesizer. CW or FIXed is
used to set the source to output a non-swept signal. LIST is used
to set the source to use LIST mode. FSWEep is used to set the
source to frequency sweep. PSWEep is used to set the source to
power sweep.
[SOURce]:MODE? Queries the current operating mode of the instrument.
[SOURce:]PHASe:[ADJust:] n
(RADians|DEGrees)
Sets the relative phase of the output signal. The default units are
in radians where the range is -2 pi >
n < +2 pi. The command also
accepts phase offsets in degrees where the range is -360° >
n <
+360°. Radians are the default units if no units are specified.
Changing frequency automatically resets the phase offset to zero.
[SOURce]:POWer:ALC:SOURce INTernal
|DIODe|PMETer|DPOSitive
Selects the source of the feedback signal for the ALC. The DIODe
parameter assumes a negative crystal detector is used. DPOSitive
allows for the use of a positive crystal detector.
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