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Ludlum Model 2221 Scaler/Ratemeter SCA
 The Ludlum Model 2221 is a Scaler/Ratememter for field survey.
Features:
- 6 Decade LCD Scaler with backlight
- Logarithmic and Linear Ratemeter with a Total Counting Range from 0 - 500,000 cpm
- Headset Compatible
- Audio Divide
- Single Channel Analyzer
- Indicated Use: Field analysis
- Compatible Detectors: G-M, proportional, scintillation
- Connector: Series "C" (others available)
- Audio: Built in unimorph speaker with volume control (greater than 60 dB at 2 feet, full volume)
- Audio Divide: Thumb switch for 1, 10, or 100 events-per-click
- Audio Jack: For optional headset
- Meter Dial: 0 - 500 cpm; 50 - 500k cpm logarithmic scale (others available)
- Multipliers: X1, X10, X100, X1k, and LOG for logarithmic scale
- Linearity: Reading within plus or minus 10% of true value with detector connected
- Digital Display: 6 digit LCD display with 0.5" (1.3cm) digits
- LCD Backlight: Activated by LAMP switch
- Digital Ratemeter: Provides a digital display of count rate when selector switch is in Dig. Rate
position
- Scaler: Used in conjunction with timer to allow for gross counting with range from 0 - 999999 counts when selector switch is in Scaler position (controlled by COUNT and HOLD buttons)
- Note: Scaler and digital ratemeter are active when not selected, allowing for concurrent use
- Timer: Switch selectable divisions of 0.1, 0.5, 1, 2, 5, 10 minutes or CONT (continuous ) for manual timing
- Calibration Controls: Accessible from front of instrument (protective cover provided)
- High Voltage: Adjustable from 200 - 2400 volts (can be checked on display)
- Threshold: Adjustable from 100 - 1000 (can be checked on display)
- Window: Adjustable from 0 - 1000 above threshold setting (can be turned on or off)
- Gain: Adjustable from 1.5 - 100 mV at threshold setting of 100
- Overload: Senses detector saturation. Indicated by "------" on LCD display and meter going to full scale (adjustable depending on detector selected)
- 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: 4 each "D" cell batteries (housed in sealed compartment that is externally accessible)
- Battery Life: Typically 250 hours with alkaline batteries (battery condition can be checked on digital display)
- Meter: 2.5"(6.4cm) arc, 1 mA analog type
- Construction: Milled 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: 9"(22.9cm)H X 4.3"(10.9cm)W X 10"(25cm)L including handle
- Weight: 5.5 lbs (2.5kg) including batteries
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