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Chapter 6 – Calibration
6.3
CALIBRATION PREPARATION
Before beginning the calibration procedure, the following items must be checked.
•
Be sure all equipment is set for the correct power-line input voltage as specified on the
original order.
•
Ensure correct earth grounds on equipment.
•
For instructions and operational details on how to set an open loop current, refer to your
power supply manual.
•
Turn on the controller or readout and power supply and allow 20 minutes for warm-up,
longer if the equipment is below room temperature.
6.4
CALIBRATION PROCEDURE
The calibration procedure is as follows:
Note:
1. Place the calibration beam onto the dynamometer shaft, inserting the shaft through the center
hole of the beam. Secure by tightening the clamping screws. See Figure 6–2.
Note:
CB Series
Calibration Beam
WT Series
Calibration Weight
2. Apply full current to the dynamometer brake.
3. With the beam perfectly horizontal, use a flathead screwdriver to adjust the ZERO trim pot
(located on the rear panel) so that the torque reading is zero ± 1 least significant dynamometer
torque digit.
Do not hang the weight until instructed to do so in step 4.
If the shaft has a flat, make sure that the flat is facing down and
tighten the clamping screw(s) against the flat only.
Figure 6–2 Calibration Setup
56
Magtrol Hysteresis Dynamometers
Level
Pins
Dynamometer shaft
Clamping screws
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