Delta LTL2000S Specifications download pdf (Page 36)

DELTA LTL2000 Retrometer 30

Light trap

Zero signal is simulated by a light trap made of two glossy and black plastic sheets mounted in an acute

angle. If clean this will provide very efficient light absorbing device.

The light trap is the tilted black plastic sheet and the area below. The light trap is a part of the base

frame. The base frame is also used for transport protection.

It is necessary to disassemble the light trap to clean it efficiently. This is easily done as shown in Figure

9. Cleaning can be done by using a fine brush, clean pressurised air or a soft paper tissue/cloth and some

window cleaning liquid.

Calibration

The LTL2000 is factory calibrated and very stable; but a calibration should always be carried out before

starting a new series of measurements.

The instrument is supplied with two calibration units. A reference calibration unit (aluminium base) and

a work calibration unit (red plastic base). The reference calibration unit is factory calibrated and

traceable to PTB. The work calibration unit must be calibrated against the reference calibration unit by

the user at suitable intervals. The reference calibration unit is stored in a protective box. The work

calibration unit is placed in a compartment below the printer. This facilitates easy access during field

operation.

When calibrating, first mount the LTL2000 in its base frame and then perform a <ZERO> reading Then

open the hatch in the instrument and place the calibration unit on the black plastic sheets right over the

middle marking and with the ceramics surface pointing in the shown direction towards the tower, close

the hatch and perform a <CALIB.> reading. Now edit the suggested RL value with the edit keys so that

it matches the value printed on the calibration unit and Rl and then press <ENTER>.

The instrument automatically compensates for zero signal, leakage and other known errors, and

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Delta LTL2000S Specifications Page 36