QEO FR 77-MM User manual

USER MANUAL
www.geo-fennel.com
FR 77-MM & FR 77-MMTracking

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Dear customer,
Thank you for your confidence in us having purchased a geo-FENNEL instrument.
This manual will help you to operate the instrument appropriately.
Please read the manual carefully - particularly the safety instructions. A proper use only guarantees a
longtime and reliable operation.
geo-FENNEL
Precision by tradition.
1. Supplied with A
2. Features B
3. Power supply C
4. Operation D
5. Safety notes E
SUPPLIED WITH
A
· Laser receiver FR 77-MM
· 4 x AA alkaline batteries
· Clamp for levelling rod
· Special mount
· User manual

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3 accuracy settings ± 2 mm / ± 5 mm / ± 9 mm
mm-indication accuracy ± 1 mm
Working range with class 2 laser 150 m
Working range with class 3R laser 350 m
Length of the receiving window 125 mm
Length of the receiving area for mm-indication 100 mm
Offset range (0SET) / from reference point ± 20 mm
Measuring units mm, cm, in, in-fraction
Signal tones 3
LCD display front, rear
LED height indicators front, side, rear
Power supply / Operating times Alkaline / 110 h
Temperature range -10°C to +50°C
Display illumination yes
Magnets top, side
Bubble vials top, side
Dust / water protection IP 67
Dimensions 170 x 77 x 32 mm
Weight 0,5 kg
FEATURES
· For use with red beam rotating lasers
· Extra long receiving window
· mm-indication of height difference between the laser plane and the reference point
· The segments of the display increase / decrease proportianally
· The „0“ position can be changed (Offset)
· Display illumination (front and rear)
· Robust clamp
· Special mount for diverse connections, e. g. scaffolding

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BFEATURES
Loudspeaker
Clamp alignment
guide
Clamp thread
0-position
(reference point)
Rear LCD Display
Magnetic strip
Side LED indicators
Rear LED indicatiors
Battery compartment
cover
Magnetic
strip
LED indicators
Sound / illumination
ON/OFF button
Accuracy button
Bubble
vial
Bubble vial
Receiving window
0SET button (Offset)
Front LCD Display
Units
Power ON/OFF

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Sign +/-
0-position
(reference point)
Battery status indicator
Units of measure
Numerical indication
0SET symbol
Accuracy symbol
Illumination symbol
Sound symbol
ON/OFF button Power ON/OFF the receiver
Accuracy button Select accuracy setting
UNITS button Select units of measure
Sound/illumination button Sound and/or illumination ON/OFF
0SET button Set a relative ZERO position

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POWER SUPPLY
C
INSERT / REPLACE BATTERIES
Open the battery compartment cover on the rear of the receiver and insert 4 x AA alkaline batteries
Refer to the battery compartment diagram to ensure correct polarity. Close the battery compartment
cover.
Always remove the batteries if the receiver will not be used for a long period of time to avoid leakage.
BATTERY STATUS INDICATOR
The FR 77-MM front LCD display has four power status symbols.
The receiver will automatically power off when the batteries are empty.
AUTOMATIC POWER-OFF
If the receiver does not receive a laser beam or is not operated for 10 minutes it will automatically
power off.
100 % power 70 % power 30 % power Empty

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OPERATION D
POWER ON
Press the ON/OFF button once to power on the receiver.
The LCD display will initialise taking about 0.5 seconds when
all the display symbols are illuminated (see diagram, left).
The receiver is now ready for use (see diagram, right).
SELECT ACCURACY SETTING
Power on the unit and select the receiving accuracy fine, normal or coarse by pressing the „accuracy
button“. The default accuracy setting following Power is „Fine“.
SWITCH ON /OFF THE SOUND
Power on the receiver and press the button „Sound/illumination“ to select the sound and volume
required. The symbols in the LCD display show the status of the sound and volume.
coarse
± 9 mm
normal
± 5 mm
fine
± 1 mm
951
low
offhigh

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SWITCH ON/OFF THE DISPLAY ILLUMINATION
Power on the receiver and keep the button „Sound/illumination“ pressed until the illumination is on.
SELECT THE UNITS
Power on the receiver and press the „UNITS“ button sucessively until the required unit symbol appears
in the display.
Millimetre Centimetre Inch Inch (fraction)

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RECEIVE A LASER BEAM
Power on the receiver and make all required settings (i. e. accuracy fine, sound high).
Carefully move the receiver up and down to detect the laser beam.
PLEASE NOTE:
If the distance between the rotating laser and the receiver is less than 1 m erroneous measurements
may occur.
Indication 1
The laser beam is high
„arrow“ is illuminated.
Acoustic signal:
Slow beep.
->Move the receiver up.
Indication 2
The laser beam is low
„arrow“ is illuminated.
Acoustic signal:
Fast beep.
->Move the receiver down.
Indication 3
The LED „0-position“
bar is illuminated.
Acoustic signal:
Continuous beep.
-> On level.

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RELATIVE 0-POSITION (REFERENCE POINT)
Within the range of ± 20 mm of the standard reference point (0-position) a relative 0-position can be
set. Press the „0SET“ button when the laser beam hits the receiving window (the „0SET“ symbol will
flash on the display). This current position of the laser beam is now set as the relative 0-position on the
receiver. Press the „0SET“ button to return to the default mode.
MM INDICATION
If the reference level of the receiver is e. g. 18 mm below the laser beam this height difference will be
displayed by an exact numerical value (see the left diagram).
further examples
The laser beam is
exactly on-level.
The laser beam is
19 mm above the
reference point
(move the receiver
up).
The laser beam is
35 mm below the
reference point
(move the receiver
down).