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1
Introduction
The Model 481 Ion Chamber Survey Meters are hand-held, battery operated units
designed to measure beta above 100 keV and gamma and x-ray radiation above 7 keV,
using the latest CMOS and LCD technology. The 481 case is constructed of high strength
ABS plastic. A gasket and desiccant pack seal moisture out of the unit and provides a
cushion for the internal components. The readout consists of a 2 1/2-digit liquid crystal
display and a 100 segment analog bar graph. The bar graph contains a zero segment and
twenty groups of five segments each. A permanent scale is located on the display screen.
The major divisions of the scale indicate the units corresponding to the range that the
meter is measuring. Units of measurement are displayed next to the 2 ½-digit display.
LOW BAT and FREEZE will appear on the display when the instrument is operating in
these modes. External controls consist of an ON/OFF button and a MODE button. The
unit is auto-ranging and auto-zeroing. The auto-on circuit for the backlight is enabled
when twilight conditions occur. The 481 has an audio alarm that can be set by the user.
Two nine-volt batteries, located in the back of the instrument, provide over 200 hours of
continuous operation. A 440 mg/cm2 phenolic shield is provided as a beta shield. The
shield also serves as an equilibrium thickness for photon measurements & protects the
Mylar window.
How to Contact Fluke
To contact Fluke, call one of the following telephone numbers:
• Technical Support USA: 1-800-44-FLUKE (1-800-443-5853)
• Calibration/Repair USA: 1-888-99-FLUKE (1-888-993-5853)
• Canada: 1-800-36-FLUKE (1-800-363-5853)
• Europe: +31 402-675-200
• Japan: +81-3-3434-0181
• Singapore: +65-738-5655
• Anywhere in the world: +1-425-446-5500
Or, visit Fluke's website at www.fluke.com
.
To register your product, visit http://register.fluke.com
.
To view, print, or download the latest manual supplement, visit
http://us.fluke.com/usen/support/manuals
.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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