Keysight N774xC Series Multiport Power Meter User’s Guide
47
Definition of Terms
3
Range settling time (one range step)
When changing from one power meter range to the next (one range higher
or lower), the settling time specifies the time required for the power meter
to settle into the new range. Measurements starting after that period are
within specifications.
The time starts when the instrument receives the range change command
(manual range) or when the instrument detects the requirement for power
meter range change (autorange).
Conditions:
As specified.
Relative port to port uncertainty
Specifies ± half the maximum difference between the measured powers of
different ports when applying the same stimulus. Measured powers
expressed in dBm, the relative port to port uncertainty U expressed in ±dB.
Figure 13
Relative port to port uncertainty
Conditions:
As specified.
Return loss
The ratio between the incident power and the power reflected back from
the instrument into the input fiber, expressed in dB.
Conditions:
As specified. (For attenuators: applicable to both ports with
fiber cables with high quality connectors in perfect optical condition on
both attenuator ports and the respective second port terminated (zero
reflectance).)
Measurement:
With return loss meter and non-coherent source of
applicable wavelength.
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