6 Using the product
34
6.2. Measuring
Important framework conditions
Please observe the following framework conditions in order to
obtain significant measurement results.
Humidity measurement (testo 880-2/-3 only):
• Gently wave the radio humidity probe (testo 880-3 only) or
separate air humidity measuring instrument about to shorten
the equalization period. Avoid sources of interference (e.g.
breathed air).
Building thermography, investigating the building shell:
• Considerable temperature difference between inside and
outside required (ideal: > 15 °C/> 27 °F).
• Consistent weather conditions, no intensive sunlight, no
precipitation, no strong wind.
In order to guarantee highest accuracy, testo 880 requires an
acclimatization time of 5 minutes after being switched on.
Important settings
Before recording an image, check whether the protection glass
option is set correctly to prevent corruption of the measurement
results, Optics... page 31.
Before saving an image, ensure that it is focused correctly (in
focus), see Focus image using autofocus (testo 880-3 only)
page 19 or Manually focusing the image page 20. Images that
are not in focus cannot be corrected retroactively!
To obtain precise readings, the emissivity and reflected
temperature must be set correctly, see Set emissivity/reflected
temperature page 29. A subsequent adjustment is possible via
the PC software as required.
With an activated auto scaling, the colour scale is continuously
adapted to the min./max. values of the current measurement
image. The colour that is to be assigned to a specific
temperature thereby changes constantly. To be able to
compare multiple images by means of the colouring, the scaling
must be manually set to fixed values, see Scale... page 26, or
must be subsequently adjusted to uniform values using the PC
software.
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