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3
Definition of Terms
Averaging time
Constant operating conditions
Data logging capability
Drift (dark)
62
Specifies the period during which the power meter or monitor power meter
takes readings from the photo-detector. The displayed power result is the
(arithmetical) average of these readings.
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.
Maximum number of power readings per port that can be captured during
a logging operation.
Specifies the maximum deviation from zero of the measured power with no
optical input (dark) over time, excluding
expressed in Watts.
Measurement: From the dark measurement result P
calculated. The fit incorporates the least square-sum difference and uses
3rd-order for the N7744C and N7745C. The Drift D is calculated by
D = max
{F
} or min
{F
}, whichever is worse.
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Figure 24
Drift (dark)
Conditions: All ports dark. Observation time as specified. Other conditions
as specified.
Noise pp (dark)
on page 64, power
, a polynomial fit F
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Keysight N774-C & 8162-C Series User's Guide
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