8.8.2 Checking the tension of the driving belt with the frequency test
Check the belt tension with measuring device for belt tension [cos14863]:
N Switch off the running machine at the main switch.
N Visually inspect the drive belt for abrasion and
correct fitting.
N Switch on the tuning device.
N Ensure that the tuning device is in „BASS“ mode,
change with button GUITAR/BASS.
N Hold the tuning device with the microphone (MIC)
close to the bottom run of the drive belt and pick the
run (see picture).
N The tension of the drive belt at the bottom run (see
picture) should be between 98 Hz and 102 Hz
(frequency during oscillation).
N Check the tone in the display: target = 1G – adjust
the tension of the drive belt if necessary.
N Check the amplitude of the needle: target 440 ... 460 – adjust the tension of the drive belt if necessary.
N When the tuning device indicates the tone 1G and an amplitude of the needle of 440 ... 460, the tension of the
drive belt is OK.
Chart with tones to the corresponding frequency:
The frequency target value is between 98 Hz and 102 Hz. This is equivalent to the tone 1G. If the result of the test
is outside of this area, the tension of the drive belt must be adjusted.
frequency < value 98: belt tension needs correction to higher tension.
frequency > value 102: belt tension needs correction to lower tension.
The driving belt must be rechecked after changing the tension of the driving belt.
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