EXFO FVA-3150 Variable Attenuator - Manual (Page 32)

Setting Up Your Variable Attenuator
26 FVA-3150
Selecting and Using an Attenuation Display Mode
To set Absolute attenuation mode:
Press the Abs button at any time to enable Absolute mode.
In Offset mode, the offset value is always displayed in the lower portion of
the display while the upper portion (large digits) displays the sum of two
values.
Before enabling the Offset mode, it is necessary to define the appropriate
offset value for the operating wavelength. A different offset value can be
associated with each wavelength in the shortlist.
dB
Abs
nm
Absolute attenuation
Wavelength