Keysight Technologies N774 C Series, Руководство пользователя

Страница: 45 / 84

Keysight N774xC Series Multiport Power Meter User’s Guide 45
Definition of Terms
3
Measurement: As for "Drift (dark)" (see, Drift (dark) on page 42).
From the measurement result P
i
and the fitted curve F
i
the noise N is
calculated by
N = 2*StDev
i
{P
i
- F
i
} , where StDev
i
{} denotes the standard deviation 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.
Operating temperature and humidity
The ambient temperature range and humidity range of the tunable laser
source for which the specifications apply.
Polarization dependent responsivity (PDR)
Specifies the dependence of the measured power on the input state of
polarization (SOP) as ± half the difference between the highest and the
lowest measured power over all SOPs, expressed in dB.
Powers expressed in dBm.
Conditions: As specified.
NOTE
If the tunable laser source module is rack- mounted the temperature and
humidity within the rack apply.