Keysight Technologies N77 Series User Manual page 64

3 Specifications and Regulations
Compliance
N O T E
64
Measurement: As for "Drift (dark)". From the measured Pi and the
fitted curve F the noise curve N
i
The noise N is
N = max {N } - min {N
i i i i
Note: The noise pp specification (rather than noise 2 sigma) is given for legacy
reasons.
Noise 2 sigma (dark)
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.
Measurement: As for "Drift (dark)" (see,
From the measurement result Pi and the fitted curve Fi the noise N is
calculated by
N = 2*StDev {P - F }, where StDev
i i i
over indices i.
Operating humidity
Humidity range where the instrument is designed to be operated.
The instrument must not be operated outside this range. If previously
stored beyond this range, wait for acclimation before turning on the
instrument.
Operating temperature
Temperature range for which the specifications apply if not differently
stated.
The instrument must not be operated outside this range. If previously
stored beyond this range, wait for acclimation before turning on the
instrument.
= P - F is calculated.
i i i
}
"Drift (dark)" on page
{} denotes the standard deviation
i
61).
Keysight N77xx Series