22
| English
1 619 929 E56 | (7.4.09)
Bosch Power Tools
Noise/Vibration Information
GBH 3-28 DRE
Professional
GBH 3-28 DFR
Professional
Measured values determined according to EN 60745.
Typically the A-weighted noise levels of the product are:
Sound pressure level
Sound power level
Uncertainty K=
Wear hearing protection!
dB(A)
dB(A)
dB
91
102
3
91
102
3
Vibration total values (triax vector sum) determined
according to EN 60745:
Hammer drilling into concrete:
Vibrational emission value a
h
Uncertainty K
Chiselling:
Vibrational emission value a
h
Uncertainty K
Drilling in metal:
Vibrational emission value a
h
Uncertainty K
Screwdriving without impact:
Vibrational emission value a
h
Uncertainty K
m/s
2
m/s
2
m/s
2
m/s
2
m/s
2
m/s
2
m/s
2
m/s
2
13
1.5
11
1.5
<2.5
1.5
<2.5
1.5
12
1.5
11
1.5
<2.5
1.5
<2.5
1.5
The vibration emission level given in this information sheet has been measured in accordance with
a standardised test given in EN 60745 and may be used to compare one tool with another. It may
be used for a preliminary assessment of exposure.
The declared vibration emission level represents the main applications of the tool. However if the
tool is used for different applications, with different accessories or poorly maintained, the vibration
emission may differ. This may significantly increase the exposure level over the total working period.
An estimation of the level of exposure to vibration should also take into account the times when
the tool is switched off or when it is running but not actually doing the job. This may significantly
reduce the exposure level over the total working period.
Identify additional safety measures to protect the operator from the effects of vibration such as:
maintain the tool and the accessories, keep the hands warm, organisation of work patterns.
OBJ_BUCH-770-003.book Page 22 Tuesday, April 7, 2009 9:51 AM
