3
The Model 840-C has been designed with the most
frequently used keys placed within natural reach. A
backlit
4-digit liquid crystal display (LCD) permits easy reading in
darkened areas. An audio indicator allows the user to
maximize a signal without having to look at the display.
The analog output allows other instrumentation to
monitor the Model 840-C power readings by providing a
voltage output proportional to detector current. The
Model 840-C’s ultra low noise, thermally stable, trans-
impedance input amplifier optimizes the detector sensi-
tivity and linearity.
1.3.1 General Warnings and Cautions
The following general warnings and cautions are appli-
cable to this instrument:
WARNING
This instrument is intended for use by qualified
personnel who recognize shock hazards or laser
hazards and are familiar with safety precautions
required to avoid possible injury. Read the instruc-
tion manual thoroughly before using, to become
familiar with the instrument’s operations and capa-
bilities.
WARNING
The American National Safety Institute (ANSI) states
that a shock hazard exists when probes or sensors
are exposed to voltage levels greater then 42VDC or
42V peak AC. Do not exceed 42V RMS between any
portion of the Model 840-C (and its detector) and
ground or a shock hazard will result.
WARNING
Use only the AC Adaptor provided with the Power
Meter by Newport.
WARNING
Do not exceed 30V RMS between the detector input
connector and earth ground and do not connect any
conducting detector housing to anything that may
have a voltage higher than 30V.
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