7. 2
Calibration Interval
We suggest a calibration interval of one year. If the instrument is used very often or
if it is used under rough conditions we recommend shorter intervals. If the instru-
ment is only occasionally used the calibration interval can be extended to 3 years.
The instruments are calibrated according to PTB standard using a standard illumi-
nant lamp at 2856 K color temperature.
7. 3
Replacement of Battery
If the symbol "" is displayed, the battery must be replaced.
Prior any replacemet of battery always respect safety measures as described
in section 3.0.
• Switch of instrument
• Loosen the three screws on the instrument rear
• Lift the battery case cover
• Remove the discharged battery
• Insert the new battery
Please refer to the description on the bottom of the battery case for correct
layout of batteries.
• Close battery case, righten the screws. The instrument is now operational.
Please consider your environment when you dispose of your one-way batte-
ries or accumulators. They belong in a rubbish dump for hazardous waste.
In most cases, the batteries can be returned to their point of sale.
Please, comply with the respective valid regulation regarding the return, re-
cycling and disposal of used batteries and accumulators.
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