INTRODUCTION
The Model 78-1 Stretch Scope telescoping gamma survey meter keeps the user at a safe distance from high rad areas, and reaches areas otherwise difficult to normally access. The wide 1 μSv/h to 10,000 mSv/h detection range is accomplished using dual energy-compensated GM detectors. The backlit digital LCD delivers precise 4-digit measurement values, which can be programmed to display units of Sv or Counts, and is accompanied by icons and messages for operational status of the instrument. Rate changes are conveniently viewed on the accompanying analog meter. The front-panel controls include separate switches for On/Off, Audio, μSv/h & mSv/h range selection, Fast/Slow response, and LCD backlight.
FEATURES
- INDICATED USE: high-activity gamma survey with telescoping detector, 3.6 m (12 ft.) fully extended
- WORKING ENVIRONMENT: splashproof shields for outdoor use
- DETECTORS: 2 energy-compensated GM tubes
- ENERGY RESPONSE: within 25% of true value from 60 keV-3 MeV
- DISPLAY: 4-digit LCD display with 1.3 cm (0.5 in.) digits, and 6.4 cm (2.5 in.) analog meter
- DISPLAY RANGE: 000.0-999.9 with indicators of Sv (R display also available)
- BACKLIGHT/RESET: temporary action 2-position toggle switch to turn backlight on for preset time, or zero meter and display
- METER DIAL: 0-10k 4-decade logarithmic
- RANGE SELECTION: 2-position toggle switch to select between µSv/h and mSv/h
- LINEARITY: reading within 10% of true value
- AUDIO: built-in click-per-event audio with ON/OFF switch
- RESPONSE: dependent on number of counts present: typical times FAST 4–25 seconds, or SLOW 4–60 seconds, from 10% to 90% of final reading
- POWER: 2 "D" cell batteries (housed in sealed handle)
- BATTERY LIFE: typically 250 hours with alkaline batteries (low battery indicated on display)
- METER: 6.4 cm (2.5 in.) arc, 1 mA analog type
- CONSTRUCTION: aluminum housing with beige powder coat paint, and polished stainless steel telescope assembly
- TEMPERATURE RANGE: -20 to 50 °C (-4 to 122 °F)
- SIZE: 18 x 10.1 x 114 cm retracted; 396.2 cm fully extended (7 x 4 x 45 in. retracted; 156 in. fully extended) (H x W x L, fully extended L)
- WEIGHT: 2.9 kg (6.4 lb) including batteries
