Manual PCE instruments PCE-HDM 20 (page 19 of 34) (English)

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4.2 Using the thermal imager

For basic operation, follow these steps:

1. Set the function switch to any position.

2. Press the “IR” button to switch ON the thermal imager. Target the object with the thermal imager

lens.

3. The display will show the temperature measurement in the upper left hand corner for the

targeted area along with the currently selected emissivity value.

4. In thermal imaging mode, the laser pointer and display cross hairs can be used to assist in

targeting. These tools can be switched ON or OFF in the Setting menu.

5. In Thermal imaging mode, the highest temperature will be auto marked by a red cross and the

lowest temperature will be auto marked by a blue cross. This can be switched ON or OFF in the

Setting menu.

6. In Thermal imaging mode, the meter continues to operate normally as a multimeter, allowing

any of the electrical functions to be used.

7. Press the HOLD button to hold the thermal image frame, then press and hold the HOLD button.

You will capture the screen and save a bitmap with measurement data to the SD card. The

saved bitmap can be analysed later by the PC software or smartphone APPs.

8. The thermal imager’s FOV (Field of view) is 21 x 21 degrees.

9. FOV is the largest area that your imager can see at a set distance.

10. The following chart lists the horizontal lFOV, vertical FOV and IFOV for lens:

Focal length

Horizontal FOV

Vertical FOV

IFOV

7.5 mm

21 °

4.53 mrad

IFOV (Instantaneous Field of View) is the smallest detail within the FOV that can be detected or

seen at a set distance. The unit is rad. The formula is:

IFOV = ( Pixel Size )/ ( Lens focal length )

D:S

theoretical

( = 1/ IFOV

theoretical

) is the calculated spot size based on the pixel size of the thermal

imager detector array and lens focal length.

Example: If the thermal imager uses a 9 mm lens because the pixel size of the detector is 34µm,

horizontal FOV is 21°, vertical FOV is 21°, the IFOV is 34µm/7.5mm = 4.53mrad;

D:S

theoretical

( = 1/ IFOV

theoretical

) = 220:1

D:S ( = 1/ IFOV ) is the spot size needed to provide an accurate temperature measure. Typically,

D:S

measure

is 2 to 3 times smaller than D:S

theoretical

, which means the temperature measurement

area of the target need to be 2 to 3 times larger than that determined by the calculated theoretical

D:S.

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PCE instruments PCE-HDM 20 Manual

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