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8
Setting Attenuation and/or Power Levels
232
If your Attenuator module is not hosted by the same mainframe as your
NOTE
reference powermeter you can, at step 7, enter the appropriate Offset
manually.
During a test that utilizes the
When the Offset (
the operating wavelength
λ
the
Offset Table entries, as shown in
Offset Value
extrapolation:
same value for
all l < l
Figure 140
•
If the operating wavelength matches a wavelength stored in the
Offset Table, the exact offset value is used. The Attenuator status
display includes 'Exa'.
•
If the operating wavelength is between two wavelengths stored in the
Offset Table, the offset applied is calculated by linear interpolation. The
Attenuator status display includes 'Int'.
•
If the operating wavelength is greater than, or less than, the range of
wavelengths stored in the
wavelength is extrapolated. The Attenuator status display includes
'Ext'.
λ
) feature is on the exact offset applied depends on how
λ
you set for the Attenuator module relates to
linear interpolation
1
l
1
Extrapolation and Interpolation of Offset Values
λ
λ
Offset Table
Figure 140
on page -232.
Offset Table, the offset value for the closest
8163A/B, 8164A/B, 8166A/B User's Guide
extrapolation:
same value for
all l > l
n
l
l
n
λ
λ
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