Bristol 428 - Page 43

Model 428 User’s Manual REMOTE COMMUNICATIONS
Bristol Instruments, Inc. 43
:SENSe:AVERage {OFF | 2 | 4 | 8 | 16 | 32 | 64 |
128}
Sets the wavelength and power averaging state to
either a numerical value (power of 2) or OFF.
:SENSe:MEDium?
Queries the type of medium for the wavelength
calculation.
:SENSe:MEDium {AIR | VACuum}
Selects the type of medium for the wavelength
calculation. Does not affect wavelength reported in
THz units.
:SENSe:POWeroffset?
Queries the power offset for the power
measurements. The units are in dB.
:SENSe:POWeroffset {OFF | 1 | ... | 20}
Selects the offset for the power measurements in
units of dB. Used to offset the effect of an external
power attenuator.
:SENSe:NULL
Resets the null value used for the power calculation.
This is to be used only when the fiber connector
protective cap is on to ensure that light does not
enter the system.
STATus Subsystem
These commands are used to retrieve SCPI or
instrument status.
:STATus:QUEStionable:CONDition?
This command queries the SCPI Questionable Status
register, which contains bits that indicate that one or
more measurement types are of questionable accuracy.
:STATus:QUEStionable:ENABle?
This command queries the Questionable Enable
register.
:STATus:QUEStionable:ENABle <integer>
Used to set and clear bits in the SCPI Questionable
Enable register.
SYSTem Subsystem
:SYSTem:ERRor?
Reads error strings from the Error Queue. If the Error
Queue has any entries, the Error Queue bit is set in the
Status Byte.
:SYSTem:HELP:HEADers?
This query returns a list of all commands/queries
supported by the instrument.
UNIT Subsystem
This command affects the power units used by the SCPI
interface.
:UNIT:POWer?
Queries power units (dBm or milliwatts).
:UNIT:POWer {DBM | MW}
Selects power units to be dBm or milliwatts. This
command does not affect the front panel display in any
way.