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No. 99MBC032A
3. Change the SHL
Change the standard SHL (50%) of the photo-electric signal generated.
The SHL can be changed in a range between 50% and 90%. First place a reference
workpiece in the measuring region and connect the oscilloscope probe to the SCAN
SIG connector located on the rear panel of the Main Unit. Observe the signals. Set
the SHL to the center of the waveform that corresponds to the shadow from the
smaller edge.
• This modification should be performed by sending the appropriate command to the
RS-232C, as follows.
“SHL75” ... Set the SHL to 75%.
“SHL50” ... Set the SHL to 50%, which is standard.
• For more information, refer to Sections 4.5, “Setting up the functions” and 6.1.9,
“Details of command descriptions”.
• If the SHL has been modified, perform calibration again.
• With the width measurement of transparent film tape for example, measurements
results may have a certain degree of dispersion. Therefore, it is recommended that a
comparison measurement be performed using a reference tape.
Workpiece
Laser scan direction
Standard SHL (50%)
v1: Peak voltage of photo-electric signal
v2: Larger voltage of the two at edges
(as generated at the edge with
better transmittance)
New SHL: Set to 50 (1+v2/v1)%
v 1
v 2
Photo-electric signal
3.2.5 Latch (holding) of the displayed value
• In a single-run measurement, etc., GO/NG judgment will be continued while the measured
data is latched (held) on the display for the specified period of time. After the set period
elapses, system operation returns to the ready state.
• Set up the display latch timer in the basic setup.
• While the display is being latched, input from the RS-232C is still valid.
