Features

	+5 to -75dBm dynamic range (+25 to -55dBm for the CATV model)
	Four digit display for 0.01dB resolution
	Large area InGaAs detector for ultimate performance at 1550 nm
	Universal 2.5 mm ferule adaptor (1.25 mm ferule adaptor optional)
	200 hr battery life
	Storage of 3 reference values for dB relative measurements
	Auto-off mode for max. battery life
	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

	Optical power measurement range: +5dBm to -75dBm (3.16 mW to 31.6 pW); +25dBm to -55dBm (316 mW to 3.16 nW)
	Detector type: Indium Gallium Arsenide (1 mm dia.)
	Display: 4 digit LCD, 0.5 in high, -0.1dB resolution
	Fibre optic connector interface: Universal 2.5 mm receptacle accepts FC, ST, SC, DIN and E2000 connectors. Optional 1.25 mm receptacle
	Calibrated wavelengths: 850, 1310 and 1550 nm
	Measurement uncertainty: +/-0.20dB from 0 to -65dBm, +/-0.27dB from 0 to +3dBm and from -65dBm to -77dBm
	Controls: On/Off, STOre REFerence, dBm and wavelength select
	Power: Four type N alkaline cells power the unit for approx. 200 hrs
	Operating temperature range: -15 to 50 C
	Storage temperature range: -25 to 60 C
	Size: 130 (L) x 64 (H) x 25 (D) mm
	Weight: 185 gm