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3
Definition of Terms
Maximum safe (input) power
Minimum averaging time
Noise pp (dark)
Noise 2 sigma (dark)
64
The maximum input power that can be applied to any port of the power
meter or attenuator without permanent change to its characteristics.
Attention: Applying more than the specified power might damage the
power meter or attenuator.
For input powers > 20 dBm, clean connectors in good condition are vital
NOTE
to avoid thermally induced fiber damage.
The minimum selectable averaging time.
Specifies the peak-to-peak (pp) change of displayed power over time with
zero input power (dark), excluding "Drift (dark)" (see,
page 62) for the N7744C and the N7745C only. Powers expressed in
Watts.
Conditions: All ports dark. Averaging time as specified. Other conditions
as specified.
Measurement: As for "Drift (dark)". From the measured P
curve F
The noise N is
N = max
The noise pp specification (rather than noise 2 sigma) is given for legacy
NOTE
reasons.
Specifies twice the standard deviation of the measured dark power (with
zero input power), excluding "Drift (dark)". Power are expressed in Watts.
Conditions: All ports dark. Averaging time as specified. Other conditions
as specified.
the noise curve N
= P
i
i
{N
} - min
{N
}
i
i
i
i
- F
is calculated.
i
i
Keysight N774-C & 8162-C Series User's Guide
Drift (dark)
on
and the fitted
i
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