HP 8163A Programming Manual page 101

command: [:SOURce[n]][:CHANnel[n]]:POWer:ATTenuation
syntax: [:SOURce[n]][:CHANnel[n]]:POWer:ATTenuation<wsp><value>[DB]
description: Sets the level of attenuation of an in-built optical attenuator, if this is
installed.
parameters: Any value in the specified range (see the specifications in the appropriate
User's Guide).
Also allowed are:
NOT E
NOT E
response: none
example:
sour2:pow:att 22.32db
affects: All Tunable Laser modules with an in-built optical attenuator and all fixed-
wavelength Laser Source modules.
Introduction to Programming
Signal Generation – The SOURce Subsystem
MIN: minimum programmable value
MAX: maximum programmable value
DEF: This is not the preset (*RST) default value but
Tunable Laser modules with in-built optical attenuators need to be
in Manual Attenuation Mode (see
[:SOURce[n]][:CHANnel[n]]:POWer:ATTenuation:AUTO on
page 102) 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[n]]:POWer[:LEVel][:IMMediate]
[:AMPlitude] on page 105).
In this respect, this command does not confirm 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.
101
is half the sum of, the minimum programmable
value and the maximum programmable value