Oerlikon Leybold Vacuum Sogevac SV630 B Operating Instructions Manual page 38

Maintenance
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38 GA02319_002_03 - 07/2007 - © Oerlikon Leybold Vacuum
How to use this v-belt tension meter :
Set the first o-ring at 10 mm on the millimeter scale, as shown figure 8.1,
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picture 4, and the other o-ring on position 0 on the Newton scale.
Install the tension meter as shown on picture 3 – figure 8, in the midle,
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half-way between the v-belt contacts point of the v-belts and the two pulleys.
Push the Newton scale's black rubber down in order to reach a 10 mm
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bending of the v-belt (pictures 2 and 4).
Check the result of your measurement. Tighten the belt tightener to reach
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the value given in table below.
The stretching of the V-belts can also be checked with a frequency
meter:
Position the tool on the longest V-belt in its centre and mark this belt.
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Place the frequency meter between the motor and generator pulleys,
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10 mm above the belts.
Strike the belt and read the frequency (Hz). Refer to the table below for the
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rated value.
≈ 10 mm
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fig. 9