EXFO IQS-3150 Variable Attenuator for IQS-500/600 - Manual (Page 36)

Setting Up Your Variable Attenuator
30 IQS-3150
Control Center Settings and Controls
Selecting a Display Mode
The active display mode determines the significance of the value
appearing on the data display. For a description of each display mode, refer
to Display Modes on page 6.
Reference
Before clicking the Reference button, select the reference attenuation
or output power (Output Power control mode) value using either the
slider, the left/right arrows, or the numeric box. Upon clicking the
Reference button, the instrument uses the selected attenuation as
reference.
X+B
Before clicking the X+B button, make sure that the B value is correctly
set (refer to Setting the B Value on page 23).
I
MPORTANT
For the IQS-3150 Variable Attenuator, the absolute (or total)
attenuation is the actual optical insertion loss between the input
and output ports, including connector losses.
Numeric box
Slider
Arrows