geo-FENNEL FET 220 Electronic Theodolite User Manual

geo-FENNEL FET 220 Electronic Theodolite

Product Information

The FET 220 is a precision instrument manufactured by geo-FENNEL. The product comes with a telescope for angle measurement, vials for leveling, and a laser plummet for accurate positioning. It is powered by a NiMH battery with an operating time of 18 hours or 4 x 1.5V AA Alkaline batteries.

Technical Data

Telescope|
---|---
Magnification| 30 / 2 mm
Clear objective aperture| 8 / 2 mm
Shortest focusing distance| 2 mm / 1.5 m
Angle Measurement|
Accuracy| Kleinster Messwert
Shortest focusing distance| 2 mm / 1.5 m
Measuring units| m gon
Display illumination| Yes
Vials|
Circular level| Yes
Plate level| Yes
Laser Plumb|
Wavelength| 650 nm
Output| 1 mw max.
Laser class| 2
Spot size| 2 mm / 1.5 m
Dimensions|
Length/width / height| N/A
Weight| N/A
Temperature range| N/A
Tribach Dust/water protection| N/A

Product Usage Instructions

Power Supply
To power off the instrument, remove the battery case and press down the hook to 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.

Operation
Before using the instrument, ensure it is properly leveled and calibrated. Follow these steps:

1. Prepare the instrument for measurement by turning it on and waiting for it to calibrate.
2. Align the instrument with the target by using the vertical and horizontal adjustments.
3. Use the laser plummet to accurately position the instrument.
4. Hold the horizontal angle reading by pressing the HOLD button on the control panel.
5. Repeat the angle measurement to ensure accuracy.

Safety Notes
The FET 220 is designed for use in triangulations, polygonizations, and engineering surveys in construction and cadastral surveys. Handle and maintain the instrument with care to ensure its longevity. For more information on laser classification, please refer to the manual.

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.

SUPPLIED WITH

• Electronic Theodolite FET 220
• Tribrach
• NiMH rechargeable battery
• Charger
• Battery compartment for alkaline batteries
• Container
• User manual

Technical data

Telescope:|
---|---
Magnification| 30 x
Clear objective aperture| 45 mm
Shortest focussing distance| 1,5 m
 |
Angle measurement:| Absolute encoder
Accuracy| 6 mgon (20“)
Shortest focussing distance| 3 mgon (10“)
Measuring units| 400 gon / 360°
Display illumination| 1 x LCD / yes
 |
Vials:|
Circular level| 30“ / 2 mm
Plate level| 8“ / 2 mm
Power supply| NiMH battery
Operating time| 18 h
alternatively| 4 x 1,5V AA Alkaline batteries
 |
Laser plummet:|
Wave length| 650 nm
Output| 1 mw max.
Laser class| 2
Spot size| 2 mm / 1,5 m
 |
Dimensions:|
Length/width / height| 190 / 165 / 345 mm
Weight| 4,8 kg
Temperature range| -20°C up to +50°C
Tribrach| detachable
Dust/water protection| IP 54

POWER SUPPLY

• Power off 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.

BATTERY STATUS INDICATION

| Full power
---|---
| Effective
| Low power but still effective
| Very low power, replace the alkaline battery / recharge the NiMH battery pack
| The instrument will shortly power off automatically.
Replace the alkaline battery / recharge NiMH battery pack immediately

KEYPAD AND FUNCTIONS

1. Carrying handle
2. Handle locking screw
3. Optical sight
4. Vertical tangent screw and clamp
5. Keypad
6. Objective lens
7. Plate level
8. Display
9. Eyepiece
10. Tribrach
11. Footscrew
12. Focusing drive
13. Battery compartment
14. Horizontal tangent screw and clamp
15. Tribrach clamp

DISPLAY INDICATION

KEYPAD FUNCTIONS

illumination on/off
| Horizontal angle right/left|
V/%| Vertical angle percentage grade/DMS|
 | Power on/off|

OPERATION

PREPARATION FOR MEASUREMENT
Level and centre the instrument precisely to ensure an optimum performance.

Setting up the instrument and the tripod
Extend the tripod legs to a suitable height and tighten the locking screw. Attach the instrument onto the tripod carefully. With the tripod centring screw slightly loose move the instrument across the tripod head until the laser plummet is in coincidence with the ground point. Level the instrument with the circular bubble. Use the footscrews 1 and 2 to move the bubble of the circular vial until it is centred. Use footscrew 3 to move the bubble to the centre of the vial.

Accurately level the instrument with the plate level
Release the horizontal clamp and rotate the instrument until the plate level is parallel with the footscrew 1 and 2. Centre the plate level using the same two footscrews. Turn the instrument by 90° and centre the bubble using footscrew 3. Repeat this procedure until the plate level is centred in all positions.

Take care of the relation between the direction of rotation of the footscrews and the moving direction of the bubble.

POWER ON / OFF

• Press the power button for 1 sec. An audio signal sounds followed by a test period of about 2 seconds. All segments are displayed on the LCD to confirm that the instrument is ready for use.
• Press and hold the power button for 2 seconds to power off the instrument.

HORIZONTAL ANGEL O-SET

• Aim at target “A” using the crosshair of the telescope.
• Press the “0SET“ key twice to set the reading of the horizontal angle 0°00’ 00”.
• The “0SET“ key is only effective for the horizontal angle.
• The horizontal angle can be set to “0“ at any time except in the HOLD mode (HOLD key).

VERTICAL ANGLE SET

• Press the power button and “R/L“ simultaneously. “F1” will be displayed.
• Press the „O-SET“ button. Indication: „F1“ – first rotation (A).
• Confirm the adjustment via collimator with „O-SET“.
• Rotate.
• „F2“ will be displayed – second rotation (B).
• Confirm the adjustment via collimator with „O-SET“.

HORIZONTAL ANGLE CLOCKWISE / ANTI-CLOCKWISE HAR / HAL)
Aim at target “A” using the crosshair of the telescope. Press the “R/L“ key; change the horizontal angle mode HAR into the mode HAL. Measuring with mode HAL. The “R/L“ key is of no effect to the vertical angle. Press the “R/L“ key once again to change the mode HAL into the mode HAR

HORIZONTAL ANGLE HOLD
Turn the tangent screw and set the required horizontal angle. Press the “HOLD“ key once, and the value of the horizontal angle flashes. Press the “HOLD“ key once again to hold the horizontal angle. Aim at the target. Press the “HOLD“ key again to release at the required horizontal angle. The “HOLD“ key has no effect to the vertical angle.

SLOPE PERCENT MODE (%)
Press the button “V%“ to switch from the vertical angular measurement shown in degrees into percent indication. Press the button “V%“ again to turn back to normal angle measurement mode.

ANGULAR REPEATED MEASUREMENT

DISTANCE MEASUREMENT USING THE STADIA METHOD
A distance measurement can be carried out yb using the crosshair.

• Read the levelling rod.
• Aim the instrument‘s telescope at the levelling rod.
• Multiply the value of the distance „d“ between the two stadia hairs with 100.
• The result „D“ = the distance from the instrument centre to the levelling rod (D = d x 100).

ATTENTION

FET 220
SPECIAL VERSION FOR THE ALIGNMENT OF MASTS AND ANTENNAS with special crosshairs.

• one interval (small) centre to 1 equates to: 10 mm over a distance of 25 m
• one interval (large) 1 to 2 equates to: 20 mm over a distance of 25 m (The values rise linearly.)

AUTOMATIC POWER OFF
The instrument will power off after 20 minutes automatically if no key is used.

DISPLAY ILLUMINATION
In dark surroundings or at unfavourable light conditions the display can be illuminated.

Power on the illumination:
Press the “SFT“ key for 2 sec.

Power off the illumination:
Press the “SFT“ key once again for 2 sec.

FUNCTION SETTING

OFF Off
3| Minimum angle display| Switch between 10“ and 20“| Setting ON 10“| Setting OFF 20“
4| Angle unit| Switch between DEG and GON| Setting ON GON| Setting OFF
DMS (Grad)

FUNCTION SETTING METHOD

• Power on and press 0SET“ simultaneously to enter the function setting mode.
• Press “0SET“ or “HOLD“ to select the items (1 – 4).
• Press “R/L“ or “V%“ to change the setting of the selected item.
• Set the desired function.
• Press “SFT“ to finish the function setting and return to the normal angle measuring mode.

ERROR DISPLAY

procedure.
E04| Internal memory system error.
E05| Reserved for factory adjustment.
E06| Failure in the angle measuring system.
E07| Rotation speed of the telescope was too fast (over 4 r/s).
E08| Angle measuring system error. The instrument should be powered off/on to eliminate this error.

SAFETY NOTES

INTENDED USE OF INSTRUMENT
Triangle, polygon and engineer measurements in the field of civil engineering as well as cadastral survey.

CARE AND CLEANING
Handle measuring instruments with care. Clean with soft cloth only after any use. If necessary damp the cloth with some water. If the instrument is wet clean and dry it carefully. Pack it up only if it is per-fectly dry. Transport in original container/case only.

SPECIFIC REASONS FOR ERRONEOUS MEASURING RESULTS
Measurements through glass or plastic windows; dirty laser emitting windows; after the instrument has been dropped or hit. Please check the accuracy. Large fluctuation of temperature: If the instrument will be used in cold areas after it has been stored in warm areas (or the other way round) please wait some minutes before carrying out measurements.

ELECTROMAGNETIC ACCEPTABILITY (EMC)
It cannot be completely excluded that this instrument will disturb other instruments (e.g. navigation sys-tems); will be disturbed by other instruments (e.g. intensive electromagnetic radiation nearby industrial facilities or radio transmitters).

CE-CONFORMITY
The instrument has a CE mark according to EN 55011: 2007, EN 61000-6-1-2007.

WARRANTY

This product is warranted by the manufacturer to the original purchaser to be free from defects in material and workmanship under normal use for a period of two (2) years from the date of purchase. During the warranty period, and upon proof of purchase, the product will be repaired or replaced (with the same or similar model at manufacturers option), without charge for either parts or labour. In case of a defect please contact the dealer where you originally purchased this product. The warranty will not apply to this product if it has been misused, abused or altered. Without limiting the foregoing, leakage of the battery, bending or dropping the unit are presumed to be defects resulting from misuse or abuse.

SAFETY INSTRUCTIONS

• Follow up the instructions given in the user manual.
• Do not stare into the beam. The laser beam can lead to eye injury. A direct look into the beam (even from greater distance) can cause damage to your eyes.
• Do not aim the laser beam at persons or animals.
• The laser plane should be set up above the eye level of persons.
• Use the instrument for measuring jobs only.
• Do not open the instrument housing. Repairs should be carried out by authorized workshops only. Please contact your local dealer.
• Do not remove warning labels or safety instructions.
• Keep the instrument away from children.
• Do not use the instrument in explosive environment.
• The user manual must always be kept with the instrument.

LASER CLASSIFICATION

• The instrument is a laser class 2 laser product according to DIN IEC 60825-1:2014.
• It is allowed to use the unit without further safety precautions.
• The eye protection is normally secured by the aversion responses and the blink reflex.
• The laser instrument is marked with class 2 warning labels.

EXCEPTIONS FROM RESPONSIBILITY

1. The user of this product is expected to follow the instructions given in the user manual. Although all instruments left our warehouse in perfect condition and adjustment the user is expected to carry out periodic checks of the product’s accuracy and general performance.
2. The manufacturer, or its representatives, assumes no responsibility of results of a faulty or intentio-nal usage or misuse including any direct, indirect, consequential damage, and loss of profits.
3. The manufacturer, or its representatives, assumes no responsibility for consequential damage, and loss of profits by any disaster (earthquake, storm, flood etc.), fire, accident, or an act of a third party and/or a usage in other than usual conditions.
4. The manufacturer, or its representatives, assumes no responsibility for any damage, and loss of profits due to a change of data, loss of data and interruption of business etc., caused by using the product or an unusable product.
5. The manufacturer, or its representatives, assumes no responsibility for any damage, and loss of profits caused by usage other than explained in the user manual.
6. The manufacturer, or its representatives, assumes no responsibility for damage caused by wrong movement or action due to connecting with other products.

geo-FENNEL GmbH

• Kupferstraße 6 D-34225 Baunatal
• Tel. +49 561 / 49 21 45
• Fax +49 561 / 49 72 34
• info@geo-fennel.de.
• www.geo-fennel.de.

All instruments subject to technical changes.

References

• Heim und Garten - Alles rund um Haus, Garten und Haushalt
• geo-FENNEL

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