THT45W-THT46
EN - 28
The representation of the ratio D (distance from the object) / S (surface of the object) for
an instrument THT45W provided with 9mm lens is described below.
Fig. 34: Representation of the THT45W instrument’s D/S ratio
In the representation, it is possible to see how the IFOV (Instant Field Of View =
geometrical resolution of the instrument = size of the single pxl of the IR sensor) is equal
to 3.78mm at a distance of 1m of the instrument from the object being measured. This
means that the instrument is capable of carrying out correct temperature measurements at
a distance of 1m on objects with a size not lower than 3.78mm.
5. The typical application of thermal cameras is the one in which it is necessary to detect
a temperature difference between two adjacent objects, as this kind of analysis is often
sufficient to identify anomalies in electrical and mechanical appliances, etc. In such
situations, in which an accurate temperature measurement is not strictly necessary,
emissivity value may be set to “1” (see § 5.2.3), it is not necessary to consider the
objects surface, its distance and the field of view). However, if accurate measures are
required (e.g. the temperature of an electric motor), it is necessary to correctly set the
parameters previously described in this manual.
6. Correctly set the temperature range of the image (see § 5.2.1), defining the adequate
values according to the MIN and MAX temperatures detected within the measured
area.
7. Frame the objects to be measured by using the laser pointer, if necessary (see §
4.2.4). The instrument displays the temperature values associated with the measuring
cursors.
8. Use the
T
(Trigger) key to freeze the image on the display and save it on the external
micro SD card. The instrument saves the images in sequence with file name
“YYYYMMDD_xxxx.jpg”
CAUTION
In the IR and Visible image visualization modes (see § 5.2.4). during the
image saving operation
waiting at least 1s
after the pressing of “Save” key
before move the camera from the object in front of it in order to avoid the
possible mismatch of IR and visible images inside the gallery section
9. Press the key
to see the saved images again (see § 5.5).
