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37215 Instruction Manual (Rev. 4)
when the pointer indicates 12. With the pointer in the same position, by adding two discs
on the slide, the force will be 360 g.
The 37216 special model for mouse is complete with special half-weight discs.
2.2.2
Force Increasing Rate
Since the screw pitch is 16 mm and the geared motor turns at 60 RPM, the slide moves
at the speed of 16 mm per second. The instrument is geometrically designed to increase
the force on the paw at a rate of 16 grams per second (16x2 with one disc added, 16x3
with two).
The rate at which the force increases has been found to be a satisfactory compromise for
normal operation.
Excessively high speed reduces the duration of the test but entails larger error caused by
variations in the operator’s reaction time when he/she releases the pedal.
Figure 2, "Back View"
On the other hand, if the speed is too low, the animal is restrained for a longer period,
which is inconvenient for the operator and may cause the animal to make spurious
movements before it actually feels pain.
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