Extech Instruments 850 OWL Dokumentacja Pobierz pdf (Strona 7)

Measurements can be taken for six different wavelengths in the FiberMeter. These wavelengths are 850, 980, 1300, 1310, 1480, and

1550nm. All but 1480nm are traceable to the National Institute of Standards and Technology (NIST). The user may toggle through

these wavelengths by pressing .

This function allows the user to set references for each wavelength for fiber attenuation

testing.

After connecting a light source to the FiberMeter:

1. Toggle the wavelength until it matches the wavelength of the source.

2. Press to zero the meter. The user will be prompted to verify the set reference.

3. Press either to set the reference, or to abort.

NOTE: When using laser sources, allow the laser to warm up according

to the manufacturer specifications to ensure accurate references.

NOTE: You may also zero the meter by pressing .

Operation, cont.

Power Units

Wavelengths

“Zeroing” the FiberMeter in Simple Meter mode

The FiberMeter is capable of displaying power readings in three different units. The user may toggle through these units by pressing

dBm (ABS) - This is an absolute (ABS) power measurement. It shows how much optical power is being received by the photodetector

in decibels referenced to a milliwatt (dBm).

dB (REL) - This is a relative (REL) power measurement. It shows the amount of optical power being received by the photodetector

relative to a user-defined reference power (i.e. “zeroing” the meter). If a reference value has been set, toggling to REL mode will show

the user how much optical power is being lost in the link.

µW (ABS) - This is an absolute (ABS) power measurement. It shows the amount of optical power being received by the photodetector

in microwatts, or millionths of a watt.

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SIMPLE METER

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Extech Instruments 850 OWL Dokumentacja Strona 7