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 actu al amplitude that is outp ut, which may be different fr om 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 install ed, the power value returned is de pendent 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 r eturned is the output power.
If you are using a ttenua tion mo de, the value re turne d is the laser ou tput po wer, and you mus t
also use the attenuation value t o calculate the output powe r (see
“[:SOURce[n]][:CHANnel[m]]:POWer:ATTenuation[l]” on page 122).
The values for the output power tha t you set in the Power Mode, and th e laser output power
that you set in the Attenuation Mode , are stored and used independen tly.
parameters: Also allowed
(for tunable laser mod-
ules only) are:
MIN: minimum amplitude level
MAX: maximum amplitude le vel
DEF: This is not the pr eset (*RST ) default va lue but is hal f the sum of,
the minimum amplitude lev el and the maximum ampl itude level
NOTE Use [l] to query the amplitude level of the ou tput power of the upper or lower wavelength la-
ser source of a dual-wavelength laser source o r a return loss module with an intern al dual-
waveleng th laser source . The de fault v alue of [l] is 1, the lower wavel ength source. The upper
wavelength source is denoted by 2.
response: Amplitude level relevant to the current value or speci fied parameter (if MIN, MAX, or DEF are
chosen as a parameter).
example: sour2:pow? → +8.00000000E-004<E ND>
affects: All laser sources, DFB sources, and tunable laser modules and return loss modules with an
internal source