13
2.6
System
Accuracy
As previously discussed total system accuracy depends both on electronic uncertainties
and detector calibration uncertainties. Table 3 details total system accuracy when making
absolute power measurements.
Table 3 Total System Accuracy
Model 840-C System Performance Specs.
840-UV
840-SL
840-IR
840-ST
840-F-SL
840-F-IR
Application Type
Free-space
Free-space
Free-space
Free-space
Optical
Optical
beams
beams
beams
beams
fibers
fibers
Wavelength Range
250-1100 nm
400-1100 nm
800-1800 nm
400-1100 nm
400-1100 nm
800-1800 nm
Detector Housing
Cylinder
Cylinder
Cylinder
Wand
Connectorized
Connectorized
Fiber
Fiber
Newport Detector
818-UV
818-SL
818-IR
818-ST
818-F-SL
818-F-IR
Detector Material
Silicon
Silicon
Germanium
Silicon
Silicon
Germanium
11.2
mm
dia
11.2
mm
dia
3 mm dia
10x10
mm
3 mm dia
3 mm dia
Measurement Range
100pW-0.2 mW
100pW-2mW
100pW-2mW
100pW-2mW
100pW-2mW
100pW-2mW
w/o
Attenuator
-70 to +7dBm (typ)
-70 to +3 dBm (typ)
-70 to +3 dBm (typ)
-70 to +3 dBm (typ)
-70 to +3 dBm (typ)
-70 to +3 dBm (typ)
Measurement Range
100
nW-0.2W
100 nW-2 W
100
nW-2W
100nW-2W
NotApplicable
Not Applicable
with
Attenuator
-40-23 dBm
-40-33 dBm
-40-33 dBm
-40-33 dBm
Resolution
10
p
W
(-80 dBm)
10 pW (-80 dBm)
10 pW (-80 dBm)
10 pW (-80 dBm)
10 pW (-80 dBm)
10 pW (-80 dBm)
NIST-Traceable
C
al
ib
ra
ti
o
n
250 to 1000,
±
2%
400 to 1000,
±
2%
780 to 1700,
±
3%
400 to 1000,
±
2%
400 to 1000,
±
2%
780 to 1700,
±
3%
Accuracy
(nm)
1010 to 1100,
±
3%
1010 to 1100,
±
3%
1710 to 1800,
±
5%
1010 to 1100,
±
3%
1010 to 1100,
±
3%
1710 to 1800,
±
5%
With Attenuator
±
6%
Detector
Housing
0.75" x 1.5" dia.
0.75" x 1.5" dia.
0.75" x 1.5" dia.
(clearance
around
1.5"
x
0.5"
dia.
1.5"
x
0.5"
dia.
Dimensions
(19 mm x 38 mm)
(19 mm x 38 mm)
(19 mm x 3 mm)
photodiode
area)
(38 mm x 12.5 mm)
(38 mm x 12.5 mm)
0.15"D x 0.75"W,
(4 x 19 mm), overall
length, 7" (178 mm)
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