Before Mounting; Compensation Value; Compensation Value Setting - Sony LASERSCALE BS65-Serie Bedienungsanleitung

4-3. Before Mounting

4-3-1. Compensation Value

The hologram grating pitch P
0.55 µm/22 µinch, while the detector signal pitch Ps is
theoretically 1/4 of it, that is 0.14 µm/5.5 µinch. This value
differs slightly from scale to scale. Therefore, it is necessary
to additionally make the pitch compensation for each scale,
in order to detect precise displacements.
The lowest four digits of the detector signal pitch for each
MMMM
scale Ps = 0.1379
compensation value.
Be sure to set the display unit or interpolator to the
compensation value of the scale before operation.
When you operate the unit in an environment
where the temperature is not 20
To operate the unit in an operating temperature which is
not 20 °C, 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 °C
Example:
The compensation value shown on the compensation
1234
value label is
1234
0.1379 x {1 x (23 _ 20) x (8 x 10
1565
= 0.1379
Temperature difference from 20 °C
Coefficient of thermal expansion of the scale
(see page 28)
The compensation value after temperature adjustment
1565
will be . Set the display unit or interpolator to this
value.
20
of the scale is approximately
G
µm at 20 °C show the
°
C
.
_6
)}

4-3-2. Compensation Value Setting

See the section "Compensation Value Setting" of the display
unit (BR series) or interpolator (BD series) operating
manuals.
Note
The compensation values of the display unit (BR series) and
interpolator (BD series) are 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 display unit or interpolator
to the correct compensation value of the scale before
operation.