Questions And Answers - TESTO 830-T3 Mode D'emploi

10. Questions and Answers

Query
lights up.
Instrument cannot be
switched on
Infrared measurement mode:
- - - lights up.
Contact measurement mode:
- - - lights up.
If we have not answered your question, please contact your local
distributor or Testo´s Customer Service.
11. Information on infrared measurement
11.1 Measurement method
Infrared measurement is an optical measurement
Keep lens clean.
Do not measure with clouded lens.
Keep measurement field (area between instrument and object
being measured) free of interferences: no dust and dirt
particles, no moisture (rain, steam) or gases.
Infrared measurement is a surface measurement
If there is dirt, dust, frost etc. on the surface, only the top layer will
be measured, i.e. the dirt.
In the case of shrinkwrapped foodstuffs, do not measure in air
pockets.
If values are critical, always subsequently measure using a
contact thermometer. Particularly in the food sector, the core
temperature should be measured with a penetration/immersion
thermometer.
Adaptation time
If the ambient temperature changes (change of location, e.g.
inside/outside measurement) the instrument needs an adaptation
time of 15 minutes for infrared measurement.
11.2 Emissivity
Materials have different emissivities, i.e. they emit different levels
of electromagnetic radiation. The emissivity of testo 830 is set in
the factory to 0.95. This is the ideal value for measuring non-
metals (paper, ceramics, plaster, wood, paints and varnishes),
plastics and food.
Bright metals and metal oxides are only suited to a limited extent
to infrared measurement on account of their low or nonuniform
emissivity.
10. Questions and Answers 13
Possible causes
- Battery empty.
- Battery empty.
- Readings outside
measurement range.
- Readings outside
measurement range.
- No probe connected.
- Probe damaged.
Possible solution
Change battery.
Change battery.
-
-
Connect probe.
Change probe.