Definition of Terms
Specifications
Agilent 81630B/4B/6B/7B Power Sensor Modules and Agilent 81635A Dual Power Sensor Module, Second Edition
19
if expressed in dB
Conditions:
reference level 10
µ
W, displayed power levels within the
specified range, zero less than specified time prior to measurement.
Note 1:
ideally
N
= 0 %, respectively 0 dB.
Note 2
: the power-dependent nonlinearity,
N
(
P
x
), can alternatively be
expressed by the following formula:
where
r
(
P
) is the power-dependent responsivity (for a power meter,
the responsivity is defined as the ratio of displayed power to actual
input power).
Linewidth
FWHM spectral bandwidth. The 3 dB width of the optical spectrum,
expressed in Hertz. Symbol:
∆
f
.
Noise
The peak-to-peak change of displayed power level with zero input
power level (dark).
Conditions:
Zero prior to measurement, averaging time and
observation time as specified, lowest power range selected and
wavelength range as specified.
Measurement
: the measurement result is obtained by:
Noise
=
P
max
−
P
min
expressed as peak-to-peak within the
given time span. Any offset is automatically excluded this way.
Power range
The power range is defined from the highest specified
input power
level to the smallest input power level that causes a noticable change
of displayed power level.
Conditions:
wavelength, averaging time as specified.
N
dB
10
D
x
D
0
⁄
P
x
P
0
⁄
-----------------
log
=
N P
x
( )
r P
x
( )
r P
0
( )
–
r P
0
( )
---------------------------------
=
Summary of Contents for 81630B
Page 90: ......
