VXI 3002 - Manual (Page 59)

STATUS BYTE
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Operating hours
These commands enable you to find out either the total operating hours or the elapsed operating
hours since the last reset, as well as to reset the elapsed time to zero.
ELAPSED
:RESET Reset elapsed operating hours to zero
Data type : None
Allowed suffices : None
Default suffix : None
Example: ELAPSED:RESET
ELAPSED? Prepares message containing information on elapsed operating hours
since last reset in the following format:
<nr2>
Example: 454.50
OPER? Prepares message containing information on total operating hours in the
following format:
<nr2>
Example: 1453.00
Frequency standard selection
These commands enable you to select a 10 MHz output to provide a standard for use with
associated equipment, as well as enabling you to select a standard (either external or internal) for
use by the instrument. When an external standard is selected, the internal TCXO is locked to the
external standard using a phase locked loop. In this case, you can select between direct and
indirect. When direct is selected the internal standard for the RF tray is provided directly from the
external standard. When indirect is selected this standard is provided from the TCXO locked to
the external standard. You should select direct if your provided standard is better than that fitted in
the instrument.
FSTD Select internal or external frequency standard
Data type : Character program data (any one of INT, EXT10DIR, EXT1IND,
EXT10IND or INT10OUT)
Allowed suffices : None
Default suffix : None
Examples: FSTD INT
FSTD EXT10IND
FSTD? Prepares message containing information on frequency standard
selection in the format:
:FSTD <char>
Example: :FSTD EXT10IND
Reading error messages
This command enables the error messages to be read off the error queue in the order that they
occurred.
ERROR? Prepares message relating to the next error in the error queue in the
following format:
<nr1>, <string>
Where <string> is a descriptive error message. The numeric value
returned is either that of the next error number or 0 if the queue is empty
or 399 if the queue is full
Example: 100,"Carrier Limit"