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 Features
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+5 to -75dBm dynamic range (+25 to -55dBm for the CATV
model) |
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Four digit display for 0.01dB resolution |
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Large area InGaAs detector for ultimate performance at 1550
nm |
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Universal 2.5 mm ferule adaptor (1.25 mm ferule adaptor
optional) |
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200 hr battery life |
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Storage of 3 reference values for dB relative
measurements |
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Auto-off mode for max. battery life |
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Virtually indestructible hard carrying/storage case
included |
The FPM-250 is the result of years of refinement of
light measurement technology. This small and rugged unit is comparable with
fibre optic power meters many times its size and price.
The FPM-250 incorporates a large-area Indium Gallium
Arsenide detector which provides much improved temperature stability at 1550 nm
than the Germanium detectors used in conventional instruments. This detector
has much higher resistance than Germanium, which enables the unit to deliver 15
to 20dB greater sensitivity at the lower end and, as a result, better linearity
at intermediate power levels.
The FPM-250 is equipped with a simple universal 2.5 mm
ferrule adaptor that accepts FC, ST, SC, DIN and similar connectors without the
need for a multitude of costly and easy-to-lose screw on adaptor caps.
For higher power optical measurements such as those
frequently required in the CATV industry, the FPM-250 with HP (high power)
option permits measurements of up to 25dBm.
Each unit has three calibration wavelengths of 850, 1310
and 1550 nm. A reference level for each wavelength can be stored in
non-volatile memory for the purpose of making loss measurements.
A battery saving Auto-shutdown mode may be invoked
whereby the unit will power itself down after 20 minutes without a key
activation. Even without this feature, the 200 hour battery life far exceeds
that of most competitive units.
The rugged carrying case provided with each unit
protects the unit from virtually any abuse for years of use.
Specifications
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Optical power measurement range: +5dBm to -75dBm (3.16 mW to
31.6 pW); +25dBm to -55dBm (316 mW to 3.16 nW) |
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Detector type: Indium Gallium Arsenide (1 mm dia.) |
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Display: 4 digit LCD, 0.5 in high, -0.1dB
resolution |
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Fibre optic connector interface: Universal 2.5 mm receptacle
accepts FC, ST, SC, DIN and E2000 connectors. Optional 1.25 mm
receptacle |
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Calibrated wavelengths: 850, 1310 and 1550 nm |
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Measurement uncertainty: +/-0.20dB from 0 to -65dBm,
+/-0.27dB from 0 to +3dBm and from -65dBm to -77dBm |
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Controls: On/Off, STOre REFerence, dBm and wavelength
select |
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Power: Four type N alkaline cells power the unit for approx.
200 hrs |
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Operating temperature range: -15 to 50 C |
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Storage temperature range: -25 to 60 C |
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Size: 130 (L) x 64 (H) x 25 (D) mm |
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Weight: 185 gm |
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