Product/Service

Ludum Model 3 Survey Meter

Source: Suntrac Services, Inc

Ludum Model 3 Survey Meter
Reading within plus or minus 10% of true value with detector connected
Compatible Detectors: G-M, scintillation
Meter Dial: 0 - 2 mR/hr, or 0 - 5k cpm, BAT TEST (others available )
Multipliers: X0.1, X1, X10, X100
Linearity: Reading within plus or minus 10% of true value with detector connected
Connector: Series "C" (others available )
Audio: Built in unimorph speaker with ON/OFF switch (greater than 60 dB at 2 feet )
Calibration Controls: Accessible from front of instrument (protective cover provided )
High Voltage: Adjustable from 200 - 1500 volts
Threshold: 30 mV plus or minus 10 mV
Response: Toggle switch for FAST (4 seconds) or SLOW (22 seconds) from 10% to 90% of
final reading
Reset: Push-button to zero meter
Power: 2 each "D" cell batteries (housed in sealed compartment that is externally accessible )
Battery Life: Typically 600 hours with alkaline batteries (battery condition can be checked
on meter )
Meter: 2.5" (6.4 cm) arc, 1 mA analog type
Construction: Cast and drawn aluminum with beige polyurethane enamel paint
Temperature Range: -4 degrees F(-20 degrees C) to 122 degrees F(50 degrees C)
May be certified for operation from -40 degrees F(-40 degrees C) to 150 degrees F(65 degrees C)
Size: 6.5" (16.5 cm)H X 3.5" (8.9 cm)W X 8.5" (21.6 cm)L
Weight: 3.5 lbs (1.6 kg) including batteries

Suntrac Services, Inc, 1818 East Main Street, League City, TX 77573. Tel: 281-338-2133; Fax: 281-338-2136.