Keysight N7744A, User Manual

Page: 64 / 105

4
Specifications and Regulations
Compliance
Definition of Terms
(Applicable) fiber type
Connection type for which the specifications and characteristics apply
(if not differently stated).
Averaging time
Specifies the period during which the power meter or monitor power
meter takes readings from the photodetector. The displayed power
result is the (arithmetical) average of these readings.
Constant operating conditions
This generally includes constant values of temperature, humidity,
wavelength, input power level, polarization state and mode
distribution, if the quantity is not explicitly subject to variation.
Data logging capability
Maximum number of power readings per port that can be captured
during a logging operation.
Drift (dark)
Specifies the maximum deviation from zero of the measured power with
no optical input (dark) over time, excluding “Noise pp (dark)” on page
65 , power expressed in Watts.
Measurement:
From the dark measurement result P
i
, a polynomial fit
F
i
is calculated. The fit incorporates the least square-sum difference and
Keysight N774x Series
User's Guide
63