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FIGURE 3.53
Hand-held optical
power meter.

FIGURE 3.54 Photodyne 2285XQ fi ber-optic power meter. (Courtesy 3M
Corporation)

measurement, but particularly for fiber-optic applications, in both
manual and computer-controlled test setups. A unique and powerful
feature of the 2285XSQ is its ratio function. This allows the user to
make ratio (A/B) measurements by stacking several instruments
together via the interface without the need for a controller.
Another very powerful feature is the built-in data logger. With this
function, data may be taken at intervals from 1 to 9999 s. This feature
is useful in testing optical devices for short- and long-term operation.
At the heart of the instrument is a built-in large-area high-
sensitivity indium gallium arsenide (InGaAs) sensor. All industry
connectors may be interfaced to the sensor using any of the Photo-
dyne series 2000 connector adapters. The sensor is calibrated for the
all the fiber-optic windows: 820, 850, 1300, and 1550 nm.