EXFO IQS-3150 Variable Attenuator for IQS-500/600 - Manual (Page 32)

Setting Up Your Variable Attenuator
26 IQS-3150
Basic Settings
Input Power
The Input Power setting, only available in the Attenuation control mode,
allows you to set the source power in dBm. This changes the attenuation
scale values in the Control Center to the equivalent values of the output
power in dBm. You can then use the slider to select an output power value
rather than an attenuation value. It is not as precise as the Output Power
control mode but it is still useful for certain test applications.
To select an input in dBm:
1. On the Settings function tab, click the Presets tab.
2. Under B Value, under Attenuation Mode, click the Input Power
button.
3. In the box next to Input Power, enter the source power in dBm.
4. Click Apply.