8163A/B, 8164A/B & 8166A/B Mainframes Programming Guide 145
Measurement Operations & Settings 4
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
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.
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 146) 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 148).
In this respect, this command does not conform to the SCPI standard. The SCPI standard requires 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 applies only to the attenuation
mode (see [:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]:AUTO on page 146).
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 modules
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
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