TESTO 876, Instruction Manual

Page: 17 / 40

5 First steps
17
Removal:
1.
Attach the red mounting ring to the protection glass.
2. Turn the mounting ring anticlockwise and remove the protection
glass.
After mounting/removing the protection glass, activate or deactivate
the
Protection glass option, Optics..., page 30. If this option is set
incorrectly, the stated measuring accuracy is not guaranteed.
Changing lens
Only lenses that were adjusted to the respective thermal imager
can be used. The serial number on the lens must match the serial
number of the instrument, see Optics..., page 30.
> Switch instrument off before changing the lens.
> To keep the lens from falling out: Hold the instrument with the
lens pointing up.
1. Turn lens lock ring anticlockwise to the stop (approx. 2 cm).
2. Remove lens.
3. Insert the new lens, thereby take care to align the white
markings on lens and instrument to each other.
4. Turn the lens lock ring clockwise to the stop.
Always store lenses not in use in the container designed for this in
the case.
> Turn the lens ring clockwise to the stop, place the lens in the
container and close it.
Switch the imager on/off
1. Remove protection cap from the lens.
2. Press [ ] .
- The start screen appears on the display. The type designation
of the imager and the firmware version are shown.
- The measurement view is opened after the warm-up period.
- The imager performs an automatic zeroing approx. every 60
sec. This can be recognized by means of a "click". The image is
frozen briefly when this occurs.
> To switch off: Press [ ] .
- The display goes out and the imager is switched off.