Laser Rangefinder
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Bosch DLE50
Notes from unboxing
Impressively small, offers multiple points of reference for measurement (front of unit, position of tripod screw attachment, rear of unit, flick-knife plastic spike ~40mm long that appears centred on optical axis of measurement).
Note 90% humidity maximum below - suspect cave fog will truly screw it up!
Will bring into the lab one day & hook it up to a silicon detector + 'scope to see what sort of measurement pulses it is sending out. Offers a 0.5s - 4s measurement time, so I suspect it is taking many and looking for wide variations / having elections to decide on the true value. I suspect a chopper will suitably confuse it :) Jarv - torturing electronics as ever...
Bosch DLE50
Ł97 inc. deliver & VAT from Carlisle glass (6-4-08)
Cavers Surveying Review: p6/7 http://www.chaos.org.uk/survex/cp/CP38/CP38.pdf
DLE 50 Specifications
Measuring range (A) 0.05 - 50 m Measuring accuracy
- typical ą1.5 mm
- maximum 3 mm (B)
Measuring duration
- typical <0.5 s
- Maximum 4 s
Lowest indication unit 1 mm (precision) Operating temperature -10 °C - +50 °C Storage temperature -20 °C - +70 °C Relative air humidity, max. 90% Laser class 2 Laser type 635 nm, <1 mW Laser beam diameter (at 25 °C), approx.
- at 10 m distance 6 mm
- at 50 m distance 30 mm
Batteries 4 x 1.5 VLR03 (AAA) Rechargeable batteries 4 x 1.2 VKR03 (AAA) Battery service life, approx. 30000 individual measurements Automatic switch-off after approx.
- Laser 20 s
- Measuring tool (without measurement) 5 min
Protection class (excluding battery compartment) IP 54 (dust and splash water protected)