HT instruments HT3320 - Manual (Page 20)

HT3320
EN - 19
7.3. IR VIDEO MODE
This mode allows carrying out IR temperature measurement with the in-built photo
camera, saving the images in standard JPG format, recording IR videos of IR temperature
measurements saving them in 3GP format, measuring the air temperature/humidity with
the in-built sensor and measuring temperature with type K probe (if enabled – see § 6.10)
1. Switch on the instrument and enter the “VIDEO IR” mode
2. Set the desired values of the measurement parameters (see § 6)
3. Hold the meter and point it towards the object whose temperature is to be measured.
The object will appear on the display because of the in-built photo camera
4. Press and hold the
S key to perform a zoom operation of the imagine at display and
press and hold the
T key to restore the normal sizes of the imagine at display
5. Press and hold the T key to start measuring, observing on the display the symbol
and the temperature value in the middle of the display, which varies in real time (see
Fig. 26)
Fig. 26: IR temperature measurement with in-built photo camera
6. Release the T key to stop the measurement and freeze the last read value. The display
shows the following symbol “ ”. The temperature values associated with fields AT,
RH%, DP and WB, if selected (see § 6.8, 6.9) are shown on the display.
7. Fig. 27 shows the ratio between distance of the instrument from the object being
measured and the spot size. As the distance (D) from the object increases, the spot
size (S) becomes larger. The focal point of the instrument is 914mm (36”). The
displayed spot sizes indicate the areas which include 90% of the detected energy.
Fig. 27: Diameter of surface S with reference to the distance D from the object (in mm)