Model 3 Survey Meter

General Purpose

Model 3 Survey Meter Model 3 Controls

The Model 3 is Ludlum's best selling, general purpose, handheld, analog ratemeter known for accuracy and long-lasting dependability. It comes in a variety of measurement ranges and units to support the external radiation detector selected.

The cast aluminum instrument housing with a separate battery compartment and metal handle offer an industrial robustness and quality that promote long-lasting protection and instrument life. The front-panel controls include a rotary switch for selecting the four-decade range, instrument shut-off, and battery test, an audio on/off switch, a fast/slow response switch, and a count reset button.

A one meter (39 in.) straight type detector cable with "C" style connector is included in the price of the instrument.

Application Alpha, Beta, and Gamma surveying
Compatible Detectors GM, Scintillation
Detection Range Dependent on detector
Linearity Reading within 10% of true value with detector connected
Meter Dial 0 - 2 mR/hr, or 0 - 500 kcpm, BAT TEST
(Meter Faces tab lists other available meter faces)
Meter 6.4 cm (2.5 in.) arc, 1 mA analog type
Controls
Rotary Selector Switch: Switches between: Instrument off; Battery check; Ranges: x0.1, x1, x10, x100
Response Switch: Toggles between FAST (4 s) or SLOW (22 s) from 10% to 90% of final reading
Reset Pushbutton: Zeroes meter
Audio Switch: Audio on/off, built-in unimorph speaker, greater than 60 dB at 0.6 meters (2 ft.)
Calibration Controls: Accessible from front of instrument (protective cover provided)
High Voltage Adjustable from 400 to 1500 Vdc
Threshold Fixed at -30 mV ± 10 mV
Temperature Range -20 to 50 °C (-4 to 122 °F)
May be certified for operation from -40 to 65 °C (-40 to 150 °F)
Power Two each "D" cell batteries housed in externally accessible sealed compartment
Battery Life Typically greater than 2000 hours with alkaline batteries (battery condition can be checked on meter)
Construction Cast and drawn aluminum with beige powder coat
Connector Series "C" (others available)
Size (H x W x L) 16.5 x 8.9 x 21.6 cm (6.5 x 3.5 x 8.5 in.), including handle
Weight 1.6 kg (3.5 lb), including batteries

Model 3 manual

Manual