Agilent Technologies ESA Series User's/Programmer's Reference page 220

Status Registers
Use Status Registers to Determine the State of Analyzer Events and Conditions
Bit Decimal Description
Value
0 0 Source Synth Unlocked: A 1 in this bit position indicates
that the synthesizer in the source (tracking generator) is
unlocked.
1 2 Freq Ref Unlocked: A 1 in this bit position indicates that
the analyzer frequency reference is unlocked.
2 4 Reserved: This bit is not used by the analyzer, but are for
future use with other Agilent products.
3 8 Reserved: This bit is not used by the analyzer, but is for
future use with other Agilent products.
4 16 Synth Unlocked: A 1 in this bit position indicates that the
analyzer synthesizer is unlocked.
5 32 Invalid Span or BW: A 1 in this bit position indicates
an invalid span or bandwidth during frequency count.
6 64 Reserved: This bit is not used by the analyzer, but are for
future use with other Agilent products.
7 128 Reserved: This bit is not used by the analyzer, but are for
future use with other Agilent products.
8 256 Reserved: This bit is not used by the analyzer, but are for
future use with other Agilent products.
9 512 Demodulation: A 1 in this bit position indicates an invalid
span during FM Demodulation and Listen measurements.
10 1024 Unused: This bit is always set to 0.
11 2048 Unused: This bit is always set to 0.
12 4096 Unused: This bit is always set to 0.
13 8192 Unused: This bit is always set to 0.
14 16384 Unused: This bit is always set to 0.
15 32768 Always Zero (0): This bit is always set to 0.
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