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No. 99MBC095A
3.2.4.2 Ultra-fine wire measurement
• In the special ultra-fine wire measuring region, a clear shade can not be obtained because a
workpiece, with a finer diameter than that of the laser beam at the focal position, must be
measured. Therefore, this wire diameter must be calculated according to a special algo-
rithm. This requires the following restrictions to be taken into account in the basic setup
where an ultra-fine wire measurement is designated.
a) Measuring interval (measurement time)
Note that the measurement time for the first measurement becomes 0.02 seconds longer
than the first interval since the wire diameter must be identified at the start of ultra-fine
wire measurement.
• Single-run measurement: (Measurement interval + 0.02 seconds)
• Continuous-run measurement: (Measurement interval + 0.02 seconds) for the first
measurement, and at regular measurement intervals
for the second and subsequent measurements.
b) Number of averaging times
Select a number between 16 and 2048.
c) Designation of the objective portion of workpiece to be measured
Only a segment specification is allowed, but an edge specification is not. If an edge
specification has been made before the setup for the ultra-fine wire measurement is
established, it is automatically changed to segment specification.
In other cases where multiple segments are set for the LSM-500S, the minimum
allowable measuring range begins at 0.1 mm. In addition, if a workpiece measures less
than 0.1 mm, only one segment can be specified.
d) Others
In extra-fine wire measurements, simultaneous measurement, dual measurement
(measurement using two measuring units), workpiece automatic detection, and group
judgment can not be set up. Setups for these functions are automatically canceled.
• The measuring position is a critical factor for ultra-fine wire measurement. Always
perform the measurement at the focal position of laser beam while referring to Section
5.2.2 “Displaying the measuring position”. In other cases where a fine gap is to be
measured, the amount of laser light may be insufficient, resulting in unstable measure-
ments. Refer to Section 4.4, “Recording the Amount of Light”, and store the amount of
light without the workpiece and fixtures in the optical path.
• The following table shows the measuring ranges if “Not performing ultra-fine wire
measurement” is designated on the LSM-500S.
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• The ultra-fine wire measurement function is only available on the LSM-500S.
