geo-FENNEL FET 405K User manual

USER MANUAL
www.geo-fennel.com
EN
FET 405K / FET 420K
FET 402K-L

2
EN
Contents
1. Supplied with A
2. Power supply B
3. Keypad and functions C
4. Operation D
5. Safety notes E
Dear customer,
Thank you for your condence 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.
SUPPLIED WITH
A
· Elektronic Theodolite FET 405K / FET 420K / FET 402K-L
· Battery and charger
· Container
· User manual
FEATURES
· 2 large easy to read LCDs
· Simultaneous reading of horizontal and vertical circle
· Illumination of display and eld view
· Clockwise / anti-clockwise horizontal angle reading
· „0“ set or hold of horizontal circle at any position
· „V“ circle reading in gon / degrees or in % slope
Additional feature of FET 402K-L:
· Coaxial, focusable laser beam integrated to the telescope

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Technical data
Magnication 30 x
Clear objective aperture 45 mm
Shortest focusing distance 1,4 m
Angle measurement inkremental
Accurady
· FET 402K-L 0,6 mgon (2“)
· FET 405K 2 mgon (10“)
· FET 420K 4 mgon (10“)
Minimum reading
· FET 402K-L 0,2 mgon (1“)
· FET 405K 1 mgon (5“)
· FET 420K 2 mgon (10“)
Compensator Two-axis compensator
Measuring units 400 gon / 360° / mil
Optical plummet 3 x
Focusing range 0,5 -
∞
Plate level 30“ / 2 mm
Circular level 8‘ / 2 mm
Operating time / power supply 35 h NiMH / 40 h Alkaline
Temperature range -20°C up to + 50°C
Dust / water protection IP 54
Tribrach detachable
Weight 4,0 kg
Variant technical data of FET 402K-L
Target focusable
Laser class 3R
Beam diameter 500 / 100 m
Maximum visibility 180 m
Devation 5“
Operating time / power supply:
Theodolite and laser 24 h NimH / 30 h Alkaline
Temperature range -20°C up to + 45°C
Weight 4,5 kg

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POWER SUPPY
B
BATTERY REPLACEMENT
Power o󰀨 the instrument and remove the battery case.
Press down the hook of the battery box and remove the cover.
Charge the battery outside of the instrument and insert it again when fully charged.
Alternatively: Insert new alkaline batteries.
Close the cover and insert the battery box again.
RECHARGE THE BATTERY
Remove the battery box from the instrument and insert the plug of the charger into the charging socket
of the battery box.
RED LIGHT at the charger indicates that the batteries are being charged.
GREEN LIGHT at charger indicates that the batteries have been fully charged.
Before rst use of the instrument fully charge the rechargeable batteries.
BATTERY STATUS INDICATION
The battery symbol on the display shows the current battery status.
Full power
E󰀨ective
Still e󰀨ective
Low power but e󰀨ective; replace the alkaline battery / recharge NiMH battery pack.
The instrument will power o󰀨 automatically shortly. Replace the alkaline battery /
recharge the NiMH battery pack immediately.

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C
KEYPAD AND FUNCTIONS
NOMENCLATURE (2)
1. Fixing screw for handle
2. Laser
3. Focusing knob
4. Telescope eyepiece
5. Horizontal tangent screw
6. Horizontal clamp knob
7. Display
8. Instrument center mark
9. Optical plummet
10. Plummet eyepiece
11. Circle vial
12.Foot screw
NOMENCLATURE (1)
1. Handle
2. Objective lens
3. Optical sight
4. Laser button
5. Plate vial
6. Battery box
7. Vertical tangent screw
8. Vertical clamp knob
9. Operating keys
10. Base locking button
11. Tripod base plate

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Button
FUNC
REP
HOLD
V/%
R/L
0SET
Δ
Δ
Δ
Function
Optional function keys
Display and crosshair illumination
Repeated angle measurement
HOLD the horizontal angle
Vertical angle display
Vertical angle / percent display
Left/right horizontal angle measurement
OSET of the horizontal angle
ON/OFF switch
Move the cursor leftward
Move the cursor rightward
Change the ashing digit
DISPLAY INDICATION
1. Ht Total value of repeated measure-
ments
2. V Vertical angle
3. Number of repeated measure-
ments
4. AVG Average of repeated measure-
ments
5. HR Right horizontal angle
6. HL Left horizontal angle
7. TILT TILT compensator function
8. F Optional function keys
9. G Angle unit GON
10. % Vertical grade %
11. REP Status of repeated measurement
12.BAT Battery status indication
If the display shows “b” after activating the TILT compensation function, which means exceeded com-
pensation range, the instrument should be set on a more even surface.

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OPERATION D
PREPARATION FOR THE MEASUREMENT
· Tripod
Place the tripod legs to a suitable length and tighten the locking clamps. Make sure that the tripod
has been set up safely.
· Mount the instrument
Monut the instrument onto the tripod carefully, and x it with the 5/8“ retaing bolt of the tripod.
· Adjust the vials
First adjust the ciruclar vial, then adjust the plate vial. The plate vial has been adjusted correctly and
the instrument is leveled perfectly if the plate vial stays centered no matter in which direction the
instrument is rotated.
· Ground point centering
The ground point can be targeted with the built-in optical plummet. Focus the target with the eypiece
of the optical plummet and focus the ground point with the focussing ring.
POWER ON THE INSTRUMENT
· Press the POWER button for 1 sec.
· The manufacturer code will be displayed (short). The buzzer
will sound. Now the instrument is ready for use.
· The vertical angle indication will show the current value.
· Rotate the telescope 360° to activate the vertical measuring
mode and to activate the keypad.
TILT CORRECTION FUNCTION
This theodolite is equipped with a TILT compensator. The TILT angle of the instrument will be compen-
sated automatically by the device. If the instrument is tilted too much “b” will be shown on the display
which means the instrument exceeds the compensator range. Level the instrument more precisely (for
activation / de-activation see (SETTING METHODS).

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VERTICAL ANGLE SET
Press the button „FUNC“
Press the button „V%“
Display indication „F1“
Press the button „O-SET“
Display indication „Step 1“ rst rotation (A)
Conrm the adjustment via collimator with „O-SET“
Rotate
Display indication „Step 2“ second rotation (B)
Conrm the adjustment via collimator with „O-SET“
MODE CONVERSION OF THE HORIZONTAL RIGHTWARD (HR) AND
LEFTWARD (HL) TURNING INCREMENT
Aim at target “A” using the crosshair of the telescope. Press the R/L key,
transform the horizontal angle mode HR into the mode HL. Measuring with
mode HL.
The R/L key is of no e󰀨ect to the vertical angle.
Press the R/L key again, transform the mode HL into the mode HR.
HORIZONTAL ANGLE OSET (OSET)
Aim at target A using the crosshair of the telescope. Press the 0SET key
once to set the reading of the horizontal angle 0°00’ 00”:
The 0SET key is only e󰀨ective for the horizontal angle.
The horizontal angle can be set 0 at any time except in the HOLD mode
(HOLD key).

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HORIZONTAL ANGLE LOCKED - UNLOCKED
· Turn the tangent knob and place the required horizontal angle.
· Press the HOLD button to hold the current value of the horizontal angle. The value will ash while
this function is active.
· Press the HOLD button again to release the value.
SLOPE PERCENT MODE (%)
· In the angle mode the vertical angle can be transformed into percent of grade.
· Press the button „V%“ to switch from the vertical angular measurement shown in degrees into per-
cent.
· The maximum % value will be 99.999 %; exceeding this display will show „- - - - -“.
ANGULAR REPEATED MEASUREMENT
1. Press the FUNC key.
2. Press the REP key to enter into the repeated mode.
3. Aim at target A and press the 0SET key once to set the rst target
reading 0°00’ 00”.
4. Turn the horizontal tangent knob to aim at the second target B.
5. Press the HOLD key to hold the horizontal angle and store in the
instrument.
6. Turn the horizontal tangent knob to aim at target A again. Press
the R/L key to release the angle and keep the status.
7. Turn the horizontal tangent knob to aim at the target B again.
8. Press the HOLD key to hold the horizontal angle and store in the
instrument. Double and average angle-value will be shown in
the display.
9. Repeat the steps 7 and 8 according to the measurement require-
ments.
10. To return to the standard angular measurement press the FUNC key,
then press HOLD key.
· The reading of the horizontal angle could reach max. ±2000°00’ 00”
when measuring in the „Plate left” or “Plate right” mode. The ve-seconds
reading could reach at least ±1999°59’ 59”.
· The repeated measurement should be limited to15 times.
· In case the deviation of two measurements exceeds or equals ±30
Error E04 will be shown in the display. Then press button OSET and
start a new measurement.

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SOUND FUNCTION (AT 90° / 100GON)
If required select the sound function to conrm passing 0 / 100 / 200 / 300 / 400gon (0°, 90°, 180°,
270°) when the collimating section rotates (see chapter SETTING METHODS).
AUTOMATIC SHUT-OFF
The automatic shut o󰀨 can be selected when the instrument is not in permanent use.
Available intervals: 10 to 30 minutes (see chapter SETTING METHODS).
ILLUMINATION OF DISPLAY AND CROSSHAIR
In dark surroundings and at unfavourable light conditions the display and crosshair can be illuminated:
Power on the illumination:
Press the button „FUNC“ - „F“ will be displayed -
press the button „FUNC“ again - the illumination is now powered on.
Power o󰀨 the illumination:
Press the button „FUNC“ - „F“ will be displayed -
press the button „FUNC“ again - the illumination is now powered o󰀨.
DISTANCE MEASUREMENT USING THE STADIA METHOD
A distance measurement can be carried out by using the crosshair.
· Read the levelling rod.
· Aim the instrument‘s telescope at the levelling
rod.
· Mulitply the value of the distance „d“ between
the two stadia hairs with 100.
· The result „D“ = the distance from the in-
strument centre to the levellig rod (D = d x 100).