Keysight Technologies 8163A/B, Programming Manual

Page: 163 / 306

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?
->
-1.00013<END>
affects: All tunable laser sources