2500A Chapter 3: Remote Operation
86 2500A Series Operation Manual, 34172 Revision C, March 2008
The following describes each bit in the Questionable Status Register:
0-9 Not Used.
10 ALC Unleveled. This bit is set whenever the output power is operated in an unleveled condi-
tion.
11 Synthesizer Unlocked. This bit is set whenever the synthesizer has lost phase lock.
12 No External Reference. This bit can be monitored whenever an external reference is applied to
the synthesizer for phase locking multiple synthesizers. This bit is set whenever the external ref-
erence signal is lost.
13-15 Not Used.
3.5.4 List Mode Operation
2500A list mode operation is not available from the front panel. In order to use list mode, remote pro-
gramming must be used.
Automation Xpress and the Automation Xpress Interface (AXI) is the preferred method of using the
2500A in remote operation. For information on using Automation Xpress and the AXI, refer to the Auto-
mation Xpress online help system.
Command-based remote interface commands can also be used to program list mode operation. The
remainder of this section includes some examples that explain how to program a 2500A for list mode
operation using commands.
3.5.4.1 Example: List Mode
The following example shows the SCPI commands that are used to program the 2500A to step its output
power level from 8 to 5 to 0 dBm while keeping its frequency constant at 5 GHz. The dwell time, that is,
the time spent on each step, is 200 ms. In this example, software triggering is used, and the sweep mode
is set to single-sweep. The last command in the sequence triggers the list.
7 6 5 4 3 2 1 0
Not Used Not Used Not Used Not Used Not Used Not Used Not Used Not Used.
15 14 13 12 11 10 9 8
Not Used Not Used Not Used No
External
Reference
Synth
unlocked
ALC
unleveled
Not Used Not Used.
Sequence Command Description
1 LIST:SEQ:AUTO ON Activate list mode.
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