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Measurement Operations & Settings Signal Generation – The SOURce Subsystem
124 Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition
command:
[:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]:DARK?
syntax: [:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]:DARK?
description: Queries whether the attenuator is set to ‘dark’ position (where all light is blocked by the la-
ser).
parameters: none
response: 0:
1:
dark position not set
dark position set
example: sour0:pow:att:dark? → 1<END>
affects: All tunable laser modules with a built-in optical attenuator.
command:
[:SOURce[n]][:CHANnel[m]]:POWer[:LEVel][:IMMediate][:AMPLitude[l]]
syntax: [:SOURce[n]][:CHANnel[m]]:POWer[:LEVel][:IMMediate][:AMPLitude[l]]<wsp><value>
[PW|NW|UW|MW|Watt|DBM]
description: Sets the power of the laser output.
NOTE
If an optical attenuator is installed, the power value returned is dependent on whether you
are using power or attenuation mode (see
“[:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]:AUTO” on page 123).
If you are using power mode, the value returned is the output power.
If you are using attenuation mode, the value returned is the laser output power, and you must
also use the attenuation value to calculate the output power (see
“[:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]” on page 122).
The values for the output power that you set in the Power Mode, and the laser output power
that you set in the Attenuation Mode, are stored and used independently.
NOTE
The instrument may not be able to output a signal with the maximum programmable power, it
will output a signal with the maximum power. Use the
“[:SOURce[n]][:CHANnel[m]]:POWer[:LEVel][:IMMediate][:AMPLitude[l]]?” on page 125 to
query the power being output.
The default units are DBM or W, depending on the unit selected using the following com-
mand: “[:SOURce[n]][:CHANnel[m]]:POWer:UNIT” on page 127.
parameters: Any value in the specified range (see the appropriate User’s Guide).
Also allowed are: MIN: minimum programmable value
MAX: maximum programmable value
DEF: This is not the preset (*RST) default value, but is the maximum
programmable level
NOTE
Use [l] to set the amplitude level of the output power of the upper or lower wavelength laser
source of a dual-wavelength laser source or a return loss module with an internal dual-wave-
length laser source. The default value of [l] is 1, the lower wavelength source. The upper
wavelength source is denoted by 2.
response: none
example: sour2:pow 23uW
affects: All tunable laser and DFB source modules