Anritsu MS9740B - Page 188

Chapter 5 Measurement Functions
5-38
When Level Detection Type is set to Point, the optical signal level
(L
S
,
Lin
) is calculated by the following formula:
When the Signal Level is set at [Signal],
)(
, sigLinS
PL l =
(W)
When the Signal Level is set at [Signal–Noise],
)()(
, sigsigLin
S
NPL ll −=
(W)
P(λsig): level at detected optical signal wavelength
N(λsig): noise level at optical signal wavelength
When Level Detection Type is set to ΣPower, the optical signal level is
calculated by the following formula:
When the Signal Level is set at [Signal],
)(
*
1
*)}({
1
,
iesActRSampl
Span
iPL
n
i
LinS
a
−
=
∑
=
(W)
When the Signal Level is set at [Signal–Noise],
)(
*
1
*)}()({
1
,
iesActRSampl
Span
NiPL
n
i
sigLinS
a
l
−
−=
∑
=
(W)
n: Data count in the range of Signal Span
Span: Span (nm)
Sampl: Sampling point
P(i): ith data level (W)
ActRes(i): ith data Actual Resolution
α: Equipment dependent power correction coefficient
Note:
When the wavelength range set at Signal Span cannot be
accommodated within the screen, only the data for the on-screen
wavelength range is totaled.