ALPA EA012 User manual

Lingua originale: inglese REV. 1 - 09/22
metrology

ALPA_UNIVERSAL PROTRACTOR
1. MODE button
2. PRESET button
3. Locking screw
4. ON/OFF button
5. Hold ± button
6. Locking bar
7. Main Ruler
8. Base Ruler Accessory
9. Blade
DESCRIPTION
6
1
8
9
5
2
4
7
3

EN
TECH DATA
Measuring range 0-360°, 2*180°, 4*90°
Resolution 1’ / 0.01°
Accuracy ± 4’ / 0.07°
Working electricity <= 150UA
Battery DC3V (Cell CR2032) battery
Working temperature from 0°C to 40°C
Storing Temperature from -5°C to 50°C
Anti interference level EMC-2 level

ALPA_UNIVERSAL PROTRACTOR
NOTE
1. Avoid from heavy shock.
2. Do not disassemble or ret the Digital Universal Protractor.
3. Wipe with a soft cloth soaked with a few cleaning oil before using. Ensure the
measuring faces are clean.
4. Power off or take out battery when no use.
5. Absolute and Relative Measurement conversion, no need calibration again after power
off or battery changed.
6. Auto power off time: 5 mins no use it auto power off.

EN
PREPARATION Rulers are with 150mm, 200mm and 300mm sizes for option.
1. Counter - clockwise rotate Locking Screw.
2. Counter - clockwise rotate Locking Bar.
3. Insert Ruler.
4. Clockwise rotate Locking Bar.
1
24
3

ALPA_UNIVERSAL PROTRACTOR
ZERO SET and ABSOLUTE 90° SET
1. Put the Digital Universal Protractor on a
at surface [1].
2. Short press ON/OFF [2].
3. The screen shows degree 0° then nish
Zero Set for measuring.
A. Zero SET Steps:
32
1

EN
ZERO SET and ABSOLUTE 90° SET
1. If need 90° to be the starting value,
close the main ruler and base ruler
accessory to reference object on
vertical surfaces.
2. Long time press, it shows 90°, then it’s
nished.
B. Absolute 90° steps:
1
90°
3
2

ALPA_UNIVERSAL PROTRACTOR
BUTTON
1. PRESET BUTTON:
Short time press PRESET, the value on screen can be read on the other direction.
Keep èressing PRESET for 3 seconds to convert to Absolute 90° mode.
2. MODE BUTTON:
Short time press MOLD to accomplish conversion among 0 - 90°, 0 - 180° and 0 - 360°
Keep pressing MOLD for 3 seconds to switch the current value between “degree” and
“divided” display unit.
3. HOLD BUTTON:
a) Short time press HOLD to lock the current measuring degree as “HOLD” shows on
the top right of the screen.
b) At HOLD mode, keep pressing HOLD for 3 seconds again, the locking measuring
degree goes to be negative number.

EN
BUTTON
Degree complement or supplement switch among 0-90°, 0-180° and 0-360° based on MODE
function. e.g. The current degree is 45°, it shows -45° under 0-90° mode; -135° under 0-180°
mode; -315° under 0-360° mode.
c) Long time press HOLD at the beginning, it shows the current measuring degree
complement of supplement.
4. ZERO/ON BUTTON:
a) Short time press ZERO/ON button for Zero setting and Power on at any position.
b) Keep pressing ZERO/ON button for 3 seconds for power off.

ALPA_UNIVERSAL PROTRACTOR
MAINTAINECE
TOUBLES REASONS SOLUTIONS
No display,
chaos or vague digits
No battery, battery in reverse
or low voltage Re-install or replace the battery
Flashing digit Low voltage
Poor contact Replace the battery
Fixed digits at times Software running error Take out the battery and
put it back after one minute