- Install the Calibration Beam on the dynamometer shaft
as shown, only leave the weight off.
- Fashion a loop of light, strong line on the weight. Do
not use a wire hook. Hooks will generally apply the force
slightly off the centerline of the pin.
- Apply full current to the dynamometer brake by turning
the Torque or Current control fully clockwise.
- With the beam exactly horizontal, adjust the ZERO trim
pot so that the torque reading is zero +/- 1 least significant
digit.
- Hang a calibrated weight of sufficient size from the clockwise
pin on the calibration beam (Clockwise position - looking
at the front of the dynamometer). The weight times the distance
calculation should be equal to, or near, the full scale
of the dynamometer.
- Adjust the CW cal trim pot so that the torque reading
equals the weight times the distance.
- Transfer the weight to the CCW pin and level the calibration
beam.
- Adjust the CCW cal trim pot so that the torque reading
equals the weight times the distance.
- Remove the weight from the calibration beam.
- Turn the Torque or Current control counter -clockwise
while pumping the calibration beam CW/CCW. This will ensure
that there are no residual bumps left on the rotor.
- Remove the calibration beam.
Your dynamometer is calibrated, ready for motor testing. |