Table of Contents
Advertisement
Available languages
Available languages
2-3. Before Mounting
2-3-1. Compensation Value
of the scale is approximately 0.55 µm/22 µinch, while the detector signal
The hologram grating pitch P
G
is theoretically 1/4 of this, that is 0.14 µm/5.5 µinch. This value differs slightly from scale to scale.
pitch R
S
Therefore, it is necessary to additionally make the pitch compensation for each scale, in order to detect
precise displacements.
= 0.1379[|] [|] [|] [|] µm at 20 dC/68
The lowest four digits of the detector signal pitch for each scale P
S
dF show the compensation value.
Be sure to set the detector to the compensation value of the scale before operation.
When you operate the unit in an environment where the temperature is not 20 d d d d d C/68 d d d d d F
To operate the unit in an environment where the temperature is not 20 dC/68 dF, adjust the compensation
value as shown below to make a temperature adjustment. The following example shows the adjustment
method for an operating temperature of 23 dC/73 dF.
Example : The compensation value shown on the compensation value label is [1] [2] [3] [4].
0.1379 [1] [2] [3] [4] x {1 + (23_20) x (_0.7 x 10
)} = 0.1379 [1] [2] [0] [5]
_6
Temperature difference from 20 dC/68 dF
Coefficient of thermal expansion of the scale (See page 13.)
The compensation value after temperature adjustment will be [1] [2] [0] [5]. Set the detector to this value.
2-3-2. Compensation Value Setting
See the section "Compensation Value Setting" of the detector (BD series) instruction manual.
n
The compensation value of the detector (BD series) is set to all zeros at the time of shipment. In this state, the alarm
sounds and you cannot operate the unit. Be sure to set the detector to the correct compensation value of the scale before
operation.
In addition, the resolution must be calculated for detectors that do not perform compensation, so refer to the detector
instruction manual.
BS77
3
(E)
Advertisement
Chapters
Table of Contents
