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Signal Generation – The SOURce Subsystem Measurement Operations & Settings
Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition 125
command:
[:SOURce[n]][:CHANnel[m]]:POWer[:LEVel][:IMMediate][:AMPLitude[l]]?
syntax: [:SOURce[n]][:CHANnel[m]]:POWer[:LEVel][:IMMediate][:AMPLitude[l]]?<wsp>
[MIN|DEF|MAX]
description: Returns the amplitude level of the output power.
The value returned is the actual amplitude that is output, which may be different from the val-
ue set for the output. If these two figures are not the same, it is indicated in the :STATus:OP-
ERation register.
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.
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
NOTE
Use [l] to query the amplitude level of the output power of the upper or lower wavelength la-
ser source of a dual-wavelength laser source or 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.
response: Amplitude level relevant to the current value or specified parameter (if MIN, MAX, or DEF are
chosen as a parameter).
example: sour2:pow? → +8.00000000E-004<END>
affects: All laser sources, DFB sources, and tunable laser modules and return loss modules with an
internal source