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Measurement Operations & Settings Signal Generation – The SOURce Subsystem
134 Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition
command:
[:SOURce[n]][:CHANnel[m]]:WAVelength:CORRection:ZERO:TEMPerature:LASTzero?
syntax: [:SOURce[n]][:CHANnel[m]]:WAVelength:CORRection:ZERO:TEMPerature:LASTzero?
description: Reports the temperature at which the last auto lamda zero took place.
parameters: none
response: float value; temperature in °C
example: sour0:wav:corr:zero:temp:last?
affects: All tunable laser modules except Agilent 81649A, Agilent 81689A/B and 819xxA/B
command:
[:SOURce[n]][:CHANnel[m]]:WAVelength:CORRection:ZERO:AUTO
syntax: [:SOURce[n]][:CHANnel[m]]:WAVelength:CORRection:ZERO:AUTO
description: Forces an auto lamda zero. This is quicker but a little less accurate than the equilavent manual
process because some checks are omitted:
parameters: none
response: none
example: sour0:wav:corr:zero:auto
affects: All tunable laser modules except Agilent 81649A, Agilent 81689A/B and 819xxA/B
command:
[:SOURce[n]][:CHANnel[m]]:WAVelength:FREQuency[l]
syntax: [:SOURce[n]][:CHANnel[m]]:WAVelength:FREQuency[l]<wsp><value>
[THZ|GHZ|MHZ|KHZ|HZ]
description: Sets the frequency difference used to calculate a relative wavelength. The output wave-
length is made up of the reference wavelength and this frequency difference.
The default units for frequency are Hertz.
The output wavelength (λ) is set from the base wavelength (λ
0
) and the frequency offset
(df). The formula for calculating the output wavelength is:
where c is the speed of light in a vacuum (2.990 x 10
8
ms
-1
)
NOTE
Use [l] to set the frequency of the upper or lower wavelength laser source of a dual-wave-
length 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.
parameters: The frequency difference is a float value in Hz.
response: none
example: sour0:wav:freq -10THZ
affects: All tunable laser sources
λ
c()
λ
o
df()c+()
---------------------------------
λ
o
=