INTRODUCTION
The Model 78 Stretch Scope telescoping gamma survey meter keeps the user at a safe distance from high rad areas, and reaches areas that are difficult to access with other probes. The wide 0.1 mR/hr to 1000 R/hr 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 R 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, mR/hr & R/hr 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 mR/hr and R/hr (Sv 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: 0-1k 4-decade logarithmic
- RANGE SELECTION: 2-position toggle switch to select between mR/hr and R/hr
- 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
