There is no absolute unit for the left and right amounts displayed on the NB-307. It is only to indicate the amount of the specimen vibration. The unit generally used to indicate the vibration is g-mm. If you want to know how many g-mm the values of the left and right amounts shown on the display board are, please calculate according to the following steps:
1. First use the master to do the left and right plane separation. (If only one single plane of the specimen needs to be corrected, please adjust the (8) and (10) to "0").
2. Put a weight (given as M g) on the left side of the master.
3. After the master rotates, the unbalanced amount on the left side is given as x, and the radius of the master is given as r mm. When the left side of the specimen vibrates at 1 g-mm, the value shown on the L amount will be x/Mr.
4. Move the weight (M g) to the right side, and the unbalanced amount is given as y. When the right side of the specimen vibrates at 1 g-mm, the value shown on the R amount will be y/Mr.
We will find that with the same weight put on the left and right sides, their vibration results are different (that is x≠y). This is because the left and right sides of the specimen are not completely symmetrical. If you want x=y, please adjust the dials (7) and (9) to control the display of left and right amounts directly.