Keysight Technologies 8163A/B - Page 163

8163A/B, 8164A/B & 8166A/B Mainframes Programming Guide 163
Measurement Operations & Settings 4
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 wavelength 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
)
Use [l] to set the frequency of the upper or lower wavelength laser 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.
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
ο
df()c+()
------------------------------
λ
ο
=
command: [:SOURce[n]][:CHANnel[m]]:WAVelength:FREQuency[l]?
syntax: [:SOURce[n]][:CHANnel[m]]:WAVelength:FREQuency[l]?
description: Returns the frequency difference used to calculate a relative wavelength.
Use [l] to query the frequency of the upper or lower wavelength laser 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.
parameters: none
response: Returns the frequency difference as a float value in Hz.
example: wav:freq?
-> -1.00000000E+013<END>
affects: All tunable laser sources