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Fault Diagnosis
Fault
Excessive noise measured by customer using smart-
phone app
Measured noise level exceeded values declared
on the energy label
2020-08-03_58300000002379_ara_en_p
Possible cause
There is no fault inside the appliance - measuring tool
and conditions are not adequate
Copyright by BSH Hausgeräte GmbH
Troubleshooting
Argumentation when the customer Is measuring noise level with a
smartphone app.
For the determination of noise the declaration value manufacturers have
to follow exactly described rules. Rules are defined in the international
standard IEC 60704. The procedures and boundary conditions described
in this standard cannot be fulfilled in a regular household environment
and by technical equipment of a smartphone. Out of that errors and devi-
ations must be expected when doing a noise measurement with a smart-
phone in a living environment. Main arguments are:
1. Advise customer:
The manufacturer's declared noise level is a sound power level.
Smartphone apps only measure sound pressure level. Both may not
be mixed up.
2. Advise customer:
The used equipment – a smartphone – does not have the required
precision.
3. Advise customer:
The application does not apply all needed post processing proced-
ures as required in the standard IEC 60704. Especially the required
time average for a clearly specified time frame is not done.
4. Advise customer:
It must be expected that the applied algorithms in the app are faulty.
Usually such apps are not certified or created by hobby program-
mers who do not know about all required specification. Thus errors
must be expected.
5. Advise customer:
Kitchens, living rooms or apartments in general do not fulfill the re-
quirements for standardized test room as described in IEC 60704.
By not fulfilling these requirements measurements at home cannot
give the right and comparable measurement result.
Page 38 of 73
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