Specifications

10 LTL-XL Retroreflectometer DELTA
To print the last measurement data, press the PRINT button .
User select (user initials)
If a user icon is displayed in the upper icon row on the measuring display, press the UP
button ▲and if necessary ◄ or ► to mark the user icon. Press the OK button to enter the
user select menu. For further information see Selecting a user id, pg19
Series ID select (name)
If a user icon is displayed in the upper icon row on the measuring display press the UP
button ▲to mark the road icon. Press the OK button to enter the series ID select menu. Se-
lect a name from the list using UP or DOWN and accept with OK or ENTER / EDIT a new
name.
Calibration
The instrument is supplied with a reference calibration unit. The reference calibration unit
is factory calibrated and traceable to PTB and NIST.
Calibration procedure
Before a calibration is carried out make sure that the calibration unit is clean.
To carry out a calibration go through the following steps:
 Before mounting the calibration unit check the RL and Qd values stamped on the cal-
ibration unit.
 Mount the calibration unit underneath the instrument. Make sure that the pins on the
interface plate fit into the holes on the calibration unit. Be very careful when you
place the instrument on the calibration plate not to damage the calibration unit and /
or the light diodes
 Press the CALIBRATION button once. Select RL or Qd calibration to calibrate one
at a time.
 Check the value displayed, if necessary adjust the calibration value shown in the dis-
play so it matches the value stamped on the calibration unit. See the Calibration
section for details.
 Press the OK button to finish the calibration or repeat if erroneous.
 Repeat the calibration process for the other measure (R
L
, Qd)
The calibration procedure is now complete. Remove the calibration unit and store it properly.
Press OK to return to the measurement display. For further details see pg. 41.
Errors and warnings
An error or warning icon will appear in the upper row of the display if the LTL-XL detects
a problem. Press the UP button ▲ to get a description of the most serious error or warning.
Now press the OK button to display a total list of all errors or warnings related to the meas-
urement and the instrument in general.