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8163A/B, 8164A/B & 8166A/B Mainframes Programming Guide
4
Measurement Operations & Settings
The table of wavelength-dependent offsets
When enabled, the attenuator uses its
λ
offset table to compensate for
wavelength dependent losses in the test set-up. This table contains, for
each wavelength specified, the additional power offset to be applied.
•
If the attenuator module is set to a wavelength corresponding to an
entry in its
λ
offset table, the stored offset is added to the global power
offset.
•
If the attenuator module is set to a wavelength between entries in its
λ
offset table, linear interpolation is used to calculate the appropriate
offset to add to the global power offset.
•
If the attenuator module is set to a wavelength beyond the range of the
entries in its
λ
offset table, the offset stored for the nearest wavelength
is added to the global power offset.
•
Whether an exact, interpolated, or extrapolated offset value is applied,
the algorithm applied can be queried using
Figure 6
Extrapolation and interpolation of attenuator module
λ
offset table
