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Measurement Operations & Settings Signal Generation – The SOURce Subsystem
122 Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition
command:
[:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]
syntax: [:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]<wsp><value>[DB|MDB]
description: Sets the level of attenuation.
parameters: Any value in the specified range (see the specifications in the appropriate User’s Guide).
Also allowed (for
tunable laser
modules only)
are:
MIN: minimum programmable value
MAX: maximum programmable value
DEF: This is not the preset (*RST) default value but is half the sum of, the
minimum programmable value and the maximum programmable value
NOTE
Use [l] to set the attenuation level of the upper or lower wavelength laser source of a dual-
wavelength laser source or of a return loss module with an internal dual-wavelength laser
source. The default value of [l] is 1, the lower wavelength source. The upper wavelength
source is denoted by 2.
NOTE
Tunable laser modules with in-built optical attenuators need to be in Manual Attenuation
Mode (see “[:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]:AUTO” on page 123) for this
value to have an affect. The output power is a combination of this value and the laser output
power (see “[:SOURce[n]][:CHANnel[m]]:POWer[:LEVel][:IMMediate][:AMPLitude[l]]” on
page 124).
NOTE
In this respect, this command does not conform to the SCPI standard. The SCPI standard re-
quires that entering an explicit value for the attenuation switches the attenuation mode OFF.
The default units are dB.
response: none
example: sour0:pow:att 22.32db
affects: All tunable laser modules with an built-in optical attenuator, and all laser source modules.
command:
[:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]?
syntax: [:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]?[MIN|DEF|MAX]
description: Queries the attenuation level.
When using a tunable laser module with a built-in optical attenuator, the value returned ap-
plies only to the attenuation mode (see
“[:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]:AUTO” on page 123).
NOTE
Use [l] to query the attenuation level of the upper or lower wavelength laser source of a dual-
wavelength laser source or of a return loss module with an internal dual-wavelength laser
source. The default value of [l] is 1, the lower wavelength source. The upper wavelength
source is denoted by 2.
parameters: Also allowed (for
tunable laser mod-
ules only) are:
MIN: minimum amplitude level
MAX: maximum amplitude level
DEF: This is not the preset (*RST) default value but is half the sum of,
the minimum amplitude level and the maximum amplitude level
response: attenuation level relevant to the current value or specified parameter (if MIN, MAX, or DEF
are chosen as a parameter).
example: sour0:pow:att? def → +3.10000000+E001<END>
affects: All tunable laser modules with an in-built optical attenuator, and all laser source modules.