HP 8163A Series Programming Manual page 92

Measurement Operations & Settings
command:
syntax:
description:
parameters:
N O T E
N O T E
N O T E
response:
example:
affects:
command:
syntax:
description:
N O T E
parameters:
response:
example:
affects:
92
[:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]
[:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]<wsp><value>[DB|MDB]
Sets the level of attenuation.
Any value in the specified range (see the specifications in the appropriate User's Guide).
Also allowed MIN: minimum programmable value
(for tunable la-
MAX: maximum programmable value
ser modules
DEF: This is not the preset (*RST) default value but is half the sum of,
only) are:
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:AUTO" on page 93)
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]" on
page 94).
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.
none
sour2:pow:att 22.32db
All tunable laser modules with an in-built optical attenuator, all laser source modules, and
return loss modules with an internal source
[:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]?
[:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]?[MIN|DEF|MAX]
Returns the attenuation level.
When using a tunable laser module with an in-built optical attenuator, the value returned
applies only to the attenuation mode (see
"[:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation:AUTO" on page 93).
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 wave-
length source is denoted by 2.
Also allowed (for MIN: minimum amplitude level
tunable laser mod-
MAX: maximum amplitude level
ules only) are:
DEF: This is not the preset (*RST) default value but is half the sum
of, the minimum amplitude level and the maximum amplitude level
attenuation level relevant to the current value or specified parameter (if MIN, MAX, or
DEF are chosen as a parameter).
sour2:pow:att? def → +3.10000000+E001<END>
All tunable laser modules with an in-built optical attenuator, all laser source modules, and
return loss modules with an internal source
HP 8163A Lightwave Multimeter, HP 8164A Lightwave Measurement System,
& HP 8166A Lightwave Multichannel System User's Guide, E1299
Signal Generation – The SOURce Subsystem