Johnson Level & Tool Mfg. 40-6690 - Manual (Page 13)

©2012 Johnson Level & Tool - Rev. 1 13
Accuracy Calibration
• Set the grade at +0.01 - +0.02%.
• Turn off the unit.
• Press and hold “left arrow” and “right arrow” keys.
• Press and release “power on/off” key when holding the “left arrow” and “right
arrow” keys.
• Hold the “left arrow” and “right arrow” keys until “mem clear” shows on the screen.
• Recalibrate the laser until |(A2-A1) - (B2-B1)| is equal or less than 3mm.
• When |(A2-A1)-(B2-B1)| is greater than 6mm, you need to contact a Johnson ®
authorized repair center.
9. Technical Specifications
Laser Wavelength 635nm±10
Laser Classification Class IIIa
Maximum Power Output ≤ 5mW
Grade Range -20% to +40%
Grade Display 00.001%
Accuracy ±1/16” at 100’ (±5mm at 100m; ±10 arc sec)
Self-Leveling Range ± 5°
Left and Right Scan ± 4°
Power Supply 4 “D” alkaline batteries, rechargeable
Ni-MH battery pack, 12V adapter, car adapter
Battery Life Ni-MH: Approximately 64 hours continuous use
Alkaline: Approximately 40 hours continuous use
Dimensions 5.19” x 14.96”
(132 x 380mm)
Weight 13.2 lbs. (6 Kg)
Working Temperature -4°F to 122°F (-20°C to +50°C)
IP Protection Class 68 nitrogen purged