Survey Meters

Ludlum Model 3

  • 4 Ranges  
  • Utilizes G-M, or Scintillation Detectors 
  • Typical Counting Range from 0 - 200 mR/hr, or 0 - 500,000 cpm 
  • Greater Than 2000 Hour Battery Life 
Survey-Ludlum-3Indicated Use: General purpose survey
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 ±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 ± 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: Two each "D" cell batteries (housed in sealed compartment that is externally accessible)
Battery Life: Typically greater than 2000 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°F(-20°C) to 122°F(50°C)
May be certified for operation from -40°F(-40°C) to 150°F(65°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

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Common Meter Dials

Survey-Ludlum3meter1   survey-ludlum3meter2