EXFO IQS-1500 Power Meters for IQS-500/600 - Manual (Page 31)

Setting Up Your Power Meters
Power Meters 23
Selecting the Measurement Unit
Selecting the Measurement Unit
Power measurements can be displayed in dB, dBm, W, or W/W (the latter
indicating the ratio between the power received and the reference for the
current wavelength and channel). When W or W/W is selected, the
software automatically selects W units (pW, nW, μW, mW), depending on
the measured power and sensitivity of the detector.
When a relative unit is selected (dB or W/W), the most recent reference
value used will become the current reference value.
To select the measurement unit (either from the Instrument or
Settings function tab):
1. Use the arrow buttons next to the Unit list to change the value.
2. click Apply to confirm your new setting.
Unit list