Manual Bosch GLM 250 VF Professional (page 24 of 319) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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24 | English

1 609 92A 0KT | (23.4.14) Bosch Power Tools

Sighting with the Optical Sight (GLM 250 VF)

(see figure N)

The sighting line through the optical sight and the laser beam

run parallel to each other. This allows for precise sighting over

long distances, when the laser dot is no longer visible with the

naked eye.

For sighting, view through the viewfinder of the optical sight

10. Take care that the optical sight window 25 is not obstruct-

ed and clean.

Note: For close vicinities, the actual and the displayed target

point are not identical.

Sighting with the Alingment Aid (see figure O)

The alignment aid 24 supports sighting over larger distances.

For this, view alongside the alignment aid on the side of the

measuring tool. The laser beam runs parallel to this sighting

line.

Working with the Tripod (Accessory)

The use of a tripod is particularly necessary for larger distanc-

es. Position the measuring tool with the 1/4" thread 21 onto

the quick-change plate of the tripod 30 or a commercially

available camera tripod. Tighten the measuring tool with the

locking screw of the quick-change plate.

Set the corresponding reference level for measurement with

a tripod by pushing button 8 (the reference level is the

thread).

Troubleshooting – Causes and Corrective

Measures

The measuring tool monitors the correct

function for each measurement. When a de-

fect is determined, only the symbol shown

aside flashes in the display. In this case, or

when the above mentioned corrective

measures cannot correct an error, have the measuring tool

checked by an after-sales service agent for Bosch power

tools.

Accuracy Check of the Measuring Tool

The accuracy of the measuring tool can be checked as follows:

– Select a permanently unchangeable measuring section

with a length of approx. 1 to 10 metres; its length must be

precisely known (e.g. the width of a room or a door open-

ing). The measuring distance must be indoors; the target

surface for the measurement must be smooth and reflect

well.

–Measure the distance 10 times after another.

The deviation of the individual measurements from the mean

value must not exceed ±1.5 mm (max.). Log the measure-

ments, so that you can compare their accuracy at a later point

of time.

Maintenance and Service

Maintenance and Cleaning

Store and transport the measuring tool only in the supplied

protective pouch.

Keep the measuring tool clean at all times.

Do not immerse the measuring tool in water or other fluids.

Cause Corrective Measure

Temperature warning indicator (i) flashing; measure-

ment not possible

The measuring tool is outside the

operating temperature range from

– 10 ° C to + 50 °C (in the function

continuous measurement up to

+40°C).

Wait until the measuring

tool has reached the

operating temperature

Battery low indicator (f) appears

Battery voltage decreasing

(measurement still possible)

Replace batteries/

rechargeable batteries

Battery low indicator (f) flashing; measurement not

possible

Battery voltage too low Replace batteries/

rechargeable batteries

The indications “ERROR” and “–––––” are indicated in

the display

The angle between the laser beam

and the target is too acute.

Enlarge the angle

between the laser beam

and the target

The target surface reflects too in-

tensely (e.g. a mirror) or insuffi-

ciently (e.g. black fabric), or the

ambient light is too bright.

Work with the laser tar-

get plate 32 (accessory)

The laser beam outlet 27 or the

reception lens 26 are misted up

(e.g. due to a rapid temperature

change).

Wipe the laser beam out-

let 27 and/or the recep-

tion lens 26 dry using a

soft cloth

Calculated value is greater than

999999 m/m

Divide calculation into

intermediate steps

The indication “ERROR” flashes at the top in the display

Addition/Subtraction of measured

values with different units of mea-

sure

Only add/subtract

measured values with

the same units of mea-

sure

Measuring result not plausible

The target surface does not reflect

correctly (e.g. water, glass).

Cover off the target

surface

The laser beam outlet 27 or the re-

ception lens 26 are covered.

Make sure that the laser

beam outlet 27 or the re-

ception lens 26 are un-

obstructed

Obstruction in path of laser beam Laser point must be

completely on target

surface.

Wrong reference level set Select reference level

that corresponds to

measurement

Cause Corrective Measure

OBJ_BUCH-947-005.book Page 24 Wednesday, April 23, 2014 9:23 AM

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Bosch GLM 250 VF Professional Manual

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