Johnson 40-6028 User manual
©2009 Johnson Level & Tool 1
28” and 48” Digital Level
Model Nos.40-6028 & 40-6048
Instruction Manual
Congratulations on your choice of this Digital Level. We suggest you
read this instruction manual thoroughly before using the instrument.
Save this instruction manual for future use.
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2©2009 Johnson Level & Tool
Table of Contents
1. Kit Contents
2. Features and Functions
3. Location of Parts/Components
4. Operating Instructions
5. Using the Product
6. Self-Check and Calibration
7. Technical Specifications
8. Care and Handling
9. Product Warranty
1. Kit Contents
Description Model No. 40-6028 & 40-6048 Qty.
Digital Level 1
“AAA” Alkaline Batteries 3
Instruction Manual 1
Carrying Case 1
2. Features and Functions
•LCD can rotate 180º
• 5 construction languages - units of measure (degrees, percent,
mm/m, in/ft in decimal, in/ft in fractional)
•Self-calibrated
•0º to 10º and 80º to 90º-position of inclination is confirmed
by a signal tone
•Numbers invert for working overhead
•Reference function making any slope “0.0”
•Hold function locks measurement on the LCD
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©2009 Johnson Level & Tool 3
3. Location of Part/Components
Handwheel
Display
Window
Operation Buttons
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4©2009 Johnson Level & Tool
4. Operating Instructions
Battery Installation
1. Turn the electronic module off while taking out the old batteries
from the battery case.
2. Open the battery cap, remove the old batteries and put in new
ones.
3. Turn on the unit to see if all functions are correct.
Note:
1. Be careful to followthe polarity symbol when replacing the
batteries.
2. Take out the batteries if the electronic module is not going to
be used for a long time.
IMPORTANT: It is the responsibility of the user to verify the
calibration of the instrument before each use.
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©2009 Johnson Level & Tool 5
5. Using the Product
Key Guide
Power Key
Turn on/off the electronic module. The electronic module will beep
twice when turned on and beep once when turned off.
Hold Key
Pressing this key will lock the current angle reading displayed on
the LCD. At this time the measurement that you are measuring stays
on your LCD. The arrows on each side of the digital readout blink in
this function to remind you that you are in the HOLD function.
Sound and LCD Illumination Key
Press this key once to turn on/off the sound function. The electronic
module will beep once. When sound function is on you will see the
horn symbol on the LCD. The level will not beep if the instrument is
at 10º or more. The level will beep faster as you move closer to 0.0º.
Asolid tone will sound when level is at 0.0º or 90%. Press and hold
this key for 3 seconds to turn on/off the LCD back light.
Zero Calibration/
Reference
Mode Sound/
Illumination
Hold Power
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6©2009 Johnson Level & Tool
Mode Key
Push the MODE button to switch from one dimension to another. This
controls which dimension your electronic module will measure in. Your
level has the capability to measure in Degrees, Percentage of slope,
Millimeters per Meter, Inches per Foot (Slope, Pitch) in decimal form
and Inches per Foot in fractions of an inch. A symbol on the upper
right of the screen will explain which MODE you are currently in.
Zero Calibration Key
Please refer to Section 6 “Self-check and calibration”.
Auto Shut-off
The electronic module will automatically shut-off in 15-20 minutes if
no key is pressed.
Low BatteryIndicator
When the batteryvoltage is low, the battery symbol will flash in the
LCD, the battery will need to be replaced.
Battery Symbol
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©2009 Johnson Level & Tool 7
Inclination Indication
The triangle arrows displayed on the two ends of the LCD indicate
the inclination direction of the digital level.
When the digital level is at the position of 0 degree, the two arrows
will showas follows:
Rotating Display
The LCD of the instrument can rotate 180 degrees.
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8©2009 Johnson Level & Tool
6. Self-Check and Calibration
Checking the Horizontal Calibration
Select a flat and horizontal platform as a reference
surface, like a table-surface.
1. Place the digital level on this reference surface,
as shown in figure 1, and then record the
measured angle reading. Record this as A1.
2. Turn the digital level 180 degrees, as shown in
figure 2, and then record the measured angle
reading. Record this as A2.
3. If A1-A2 is greater than .2º, it is necessary to
calibrate the horizontal accuracy.
Checking the Vertical Calibration
Select a flatand vertical platform as a reference
surface.
1. Place the digital level on this reference
surface, as shown in figure 3, and then
record the measured angle reading. Record
this as A1.
2. Turn the digital level 180 degrees, as shown
in figure 4, and then record the measured
angle reading. Record this as A2.
3. If A1-A2 is greater than .2º, it is necessary to
calibrate the vertical accuracy.
IMPORTANT: It is the responsibility of the user to verify the
calibration of the instrument before each use.
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©2009 Johnson Level & Tool 9
Horizontal Calibration
1. Press and hold the CAL/REF key for 3-plus seconds, unit will beep
once. When the LCD shows -0-, the digital level has entered the
calibration mode.
2. Place the digital level on the horizontal reference surface, as shown in
figure 5, after 10 seconds, press the CAL/REF again, and the LCD
shows -1-.
3. Turn the digital level 180 degrees, as shown in figure 6, and after 10
seconds, press the CAL/REF key again, and the LCD shows -2-. Wait
for 2 seconds, and the digital level will show the angle reading. The
horizontal calibration is now completed.
Vertical Calibration
1. Press and hold the CAL/REF key for 3-plus seconds,
unit will beep once. When the LCD shows -0-, the
digital level has entered the calibration mode.
2. Place the digital level on the vertical reference sur-
face, as shown in figure 7, after 10 seconds, press
the CAL/REF again, and the LCD shows -1-.
3. Turn the digital level 180 degrees, as shown in
figure 8, and after 10 seconds, press the CAL/REF
key again, and the LCD shows -2-. Wait for 2
seconds, and the digital level will show the angle reading. The
vertical calibration is now completed.
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10 ©2009 Johnson Level & Tool
7. Technical Specifications
Range of Angle Measurement 360º, Display ± 90º
Definition Rate 0.1º
Accuracy ± 0.1º for 0º and 90º
± 0.2º for other angles
Power Supply 3 “AAA” alkaline batteries
Battery Life Approx. battery life 60 hours
continuous use
Working Temperature 14°F to 113°F (-10°C to +45°C)
8. Care and Handling
•This unit is a precision tool that must be handled with care.
•Avoid exposing unit to shock vibrations and extreme temperatures.
•Before moving or transporting the unit, make sure thatthe unit
is turned off.
•Remove the batteries when storing the unit for an extended time
(more than three months) to avoid damage to the unit should
the batteries deteriorate.
•Always store the unit in its case when not in use.
•Avoid getting the unit wet.
•Keep the unit dry and clean. Remove any moisture or dirt with a
soft, dry cloth.
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