EXFO IQS-1500 Power Meters for IQS-500/600 - Manual (Page 19)

Getting Started with Your Power Meters
Power Meters 11
Inserting and Removing Test Modules
The module is correctly inserted when its front panel is flush with the front
panel of the controller or expansion unit.
When you turn on the controller unit, the startup sequence will
automatically detect your module.
Note: You can insert IQ modules into your controller or expansion unit; the
IQS Manager software will recognize them. However, the
IQS-1100/IQS-1500 locking mechanism (retaining screw) will not work for
IQ modules.
To remove a module from your controller or expansion unit:
1. While pulling gently on the knob, turn it counterclockwise until it stops.
The module will slowly be released from the slot.
Retaining screw knob