Ludlum Model 3, Alpha, Beta, and Gamma Surveys

Ludlum Model 3, Alpha, Beta, and Gamma Surveys
Specifications
PRODUCT DESCRIPTION
  • APPLICATION: alpha, beta, and gamma surveying
  • DETECTION RANGE:typically 0-200 mR/hr, or 0-500,000 cpm
  • COMPATIBLE DETECTORS: GM, scintillation
  • LINEARITY: reading within 10% of true value with detector connected
  • HIGH VOLTAGE: adjustable from 400-1500 Vdc
  • THRESHOLD: fixed at 40 mV ± 10 mV
  • METER DIAL: 0-2 mR/hr, or 0-500 kcpm, BAT TEST
  • METER: 6.4 cm (2.5 in.) arc, 1 mA analog type
  • CONTROLS:
    1. Rotary Selector: switches between instrument off, battery check, ranges: x 0.1, x1, x10, x100
    2. Response Switch: toggles between FAST (4 seconds) or SLOW (22 seconds) from 10% to 90% of final reading
    3. Reset Pushbutton: to zero meter
    4. Audio Switch: for audio on/off, built-in unimorph speaker, greater than 60 dB at 0.6 meters (2 ft)
    5. Calibration Controls: accessible from front of instrument (protective cover provided)
  • CONSTRUCTION: cast and drawn aluminum with beige powder coat
  • CONNECTOR: series “C”
  • 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)
  • SIZE: 16.5 x 8.9 x 21.6 cm (6.5 x 3.5 x 8.5 in.) (H x W x L), including handle
  • WEIGHT: 1.6 kg (3.5 lb), including batteries

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