Performing The Dark Reference; Positioning The Target - MICRO-EPSILON confocalDT 2421 Quick Manual

Initial Operation

Performing the Dark Reference

This step is required each time a sensor is changed;
controller warm-up time approx. 30 min.
Cover the sensor with a piece of dark paper. Go to
the Settings > Sensor > Dark reference
menu and click on the Start button.
As a check, set the measuring rate to 100 Hz, Set-
tings > Data recording > Measuring rate
menu.
Use Video to select the video signal display.
Make sure that an exposure time of 10,000 μs is dis-
played. If the signal is not satisfactory, we recommend
cleaning the connections on the controller and on the
fiber optics. For this, use the One-Click Cleaner from the
optional accessories, article 0135032.
Typical signal curve for a dark signal
confocalDT 2421 / 2422
During the dark reference, there must be no objects
within the measuring range nor ambient light reaching the
sensor under any circumstances. Duration approx. 20 s.

Positioning the Target

Position the target as centrally as possible within the
measuring range.
100 %
Sensor
SMR
The Range LED on the front of the controller indicates the
position of the target relative to the sensor.
Flashing red
Red
Yellow
Green
50
0
SMR MMR EMR
Target
Measuring range (MR)
Dark signal acquisition in
progress
No target present or target
outside of measuring range
Target close to mid of
measuring range
Target within the measuring
range
Dis-
place-
ment
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