Keysight N7744A User Manual page 65

4
Specifications and Regulations Compliance
64
uses 3rd-order for the N7744A and N7745A and 1st-order for the
N7747A and N7748A. The Drift D is calculated by
D = max {F } or mini{F
i i
Figure 43 Drift (dark)
Conditions: All ports dark. Observation time as specified. Other
conditions as specified.
Dynamic range (logging mode)
For a fixed power meter range, dynamic range D specifies the difference
between the maximum displayable value P
corresponding power meter range and the minimum measurable power
P in dBm.
min
Conditions: As specified.
Measurement: P
is 3 dB above the nominal power meter range value
max
(that is, in the +0 dBm power meter range P
the +10 dBm range with P
root-sum-square (RSS) of the specified "Noise 2 sigma (dark)" (see,
"Noise 2 sigma (dark)" on page 66
(dark)" on page 63. RSS is calculated in linear units (Watts).
Frequency Response
Specifies the frequency f
function is above a defined cutoff level.
The transfer function is the measured optical amplitude on a modulated
sinusoidal optical input divided by the actual amplitude over
modulation frequency, expressed in dB.
Conditions: Cutoff level as specified. Other conditions as specified.
}, whichever is worse.
i
max
max
= +10 dBm. P ,dBm is calculated as the
max min
and "Drift (dark)" (see,
up to which the power meter's transfer
resp
in dBm in the
is +3 dBm), except for
"Drift
Keysight N774x Series