18  Working with measurement tools

18.1  General

To measure a temperature, you can use one or more measurement tools, e.g., a spotmeter or a box.
Graphic

18.2  Adding/removing measurement tools

Follow this procedure:

1

Push the navigation pad to display the menu system.

2

Select icon (Measurement) and push the navigation pad. This displays a submenu.

3

Use the navigation pad to select one of the following:

  • Select icon (No measurements) to remove all tools.
  • Select icon (Center spot) to add a center spot.
  • Select icon (Hot spot) to add a hot spot detection within a box area.
  • Select icon (Cold spot) to add a cold spot detection within a box area.
  • Select icon (User preset 1) to add user preset 1. (Not available in all camera models.)
  • Select icon (User preset 2) to add user preset 2. (Not available in all camera models.)
4

Push the navigation pad to confirm and exit the menu mode.

18.3  Editing user presets

A user preset is a measurement tool, or a group of measurement tools, with predefined characteristics.

Follow this procedure:

1

Push the navigation pad to display the menu system.

2

Select icon (Measurement) and push the navigation pad. This displays a submenu.

3

Use the navigation pad to select icon (User preset 1) or icon (User preset 2).

4

Push and hold the center of the navigation pad. This displays the Edit user preset menu.

5

Select icon (Add measurement) and push the navigation pad. This displays a submenu.

6

Use the navigation pad to select one of the following:

  • Select icon (Add spot) to add a spot.
  • Select icon (Add box) to add a box.
  • Select icon (Add circle) to add a circle.
  • Select icon (Add delta) to set up a differential calculation.
7

Push the navigation pad. This displays the measurement tool on the screen.

8

Push the navigation pad. This displays a context menu, where you can select one or more of the following actions (depending on the type of tool):

  • Remove the tool.
  • Resize, move, center, and rotate the tool.
  • Set alarms.
  • Display maximum, minimum, average, and area values.
  • Set local parameters.
  • When completed, select icon (Done) and push the navigation pad.
9

When all measurement tools have been added, select icon (Save as user preset).

10

Push the navigation pad to confirm and exit the menu mode.

18.4  Moving and resizing a measurement tool

18.4.1  General

You can move and resize a measurement tool.

18.4.2  Moving a spot

Follow this procedure:

1

To select the spot, touch the tool on the screen. The tool is now displayed with a frame.

2

Push the navigation pad—or touch and hold the tool. This displays a context menu.

3

To move the spot, do the following:

  1. Selecticon (Move spot) and push the navigation pad.
  2. Push the navigation pad up/down and left/right to move the spot.
4

To center the spot, select icon Center spot and push the navigation pad.

5

When completed, push the navigation pad and select icon (Done).

6

Push the navigation pad to confirm and exit the menu mode.

18.4.3  Moving and resizing a box or circle tool

Follow this procedure:

1

To select the measurement tool, touch the tool on the screen. The tool is now displayed with one or more handles.

2

Push the navigation pad—or touch and hold the tool. This displays a context menu.

3

Select icon (Move/resize) and push the navigation pad. This displays a submenu.

4

Use the navigation pad to select one of the following:

  • Select icon (Resize) to change the size of the tool.
  • Select icon (Move) to move the tool.
  • Select icon (Center box/circle) to center the tool.
5

Push the navigation pad up/down and left/right to resize or move the tool.

6

When completed, push the navigation pad and select icon (Done).

7

Push the navigation pad to confirm and exit the menu mode.

18.5  Changing the measurement parameters

18.5.1  General

For accurate measurements, it is important to set the measurement parameters.

18.5.2  Types of parameters

The camera can use these measurement parameters:
  • External IR window compensation, i.e., the temperature of any protective windows, external lenses (e.g., the close-up lens), etc., that are set up between the camera and the object of interest. If no protective window, protective shield, or external lens is used, this value is irrelevant and should be left inactive.
  • Object distance, i.e., the distance between the camera and the object of interest.
  • Atmospheric temperature, i.e., the temperature of the air between the camera and the object of interest.
  • Relative humidity, i.e., the relative humidity of the air between the camera and the object of interest.
  • Reflected temperature, which is used when compensating for the radiation from the surroundings reflected by the object into the camera. This property of the object is called “reflectivity.”
  • Emissivity, i.e., how much radiation an object emits, compared with the radiation of a theoretical reference object at the same temperature (called a “blackbody”). The opposite of emissivity is reflectivity. The emissivity determines how much of the radiation originates from the object as opposed to being reflected by it.
Emissivity is the most important measurement parameter to set correctly. If the Emissivity is set to a low value, the Reflected temperature also becomes important. The parameters Object distance, Atmospheric temperature, and Relative humidity are relevant for longer distances. The External IR window compensation must be activated if a protective window or external lens is used.

18.5.3  Recommended values

If you are unsure about the values, the following are recommended:
Object distance
1.0 m (3.3 ft.)
Atmospheric temperature
20°C (69°F)
Relative humidity
50%
Reflected temperature
20°C (69°F)
Emissivity
0.95

18.5.4  Procedure

You can set the measurement parameters globally. You can also change the Emissivity, Reflected temperature, and Object distance parameters locally for a measurement tool.
Local parameters are normally only effective for a fixed setup, where each measurement tool is set for a specific object of interest. For a general handheld application, the global parameters are usually sufficient.

18.5.4.1  Setting global parameters

Follow this procedure:

1

Push the navigation pad to display the menu system.

2

Select icon (Measurement parameters) and push the navigation pad. This displays a submenu.

3

Use the navigation pad to select one or more of the global measurement parameters:

  • icon (External IR window compensation).
  • icon (Object distance).
  • icon (Atmospheric temperature).
  • icon (Relative humidity).
  • icon (Reflected temperature).
  • icon (Emissivity).
4

Push the navigation pad to display a dialog box.

5

Use the navigation pad to change the parameter.

6

Push the navigation pad to confirm and exit the menu mode.

18.5.4.2  Changing local parameters

You can change the local parameters for a measurement tool.
A P next to the measurement tool on the screen indicates that local parameters have been activated for the tool.

Follow this procedure:

1

To select the measurement tool, touch the tool on the screen. The tool is now displayed with one or more handles.

2

Push the navigation pad—or touch and hold the tool. This displays a context menu.

3

Select icon (Use local parameters) and push the navigation pad.

4

Push the navigation pad to activate the use of local parameters. This displays a submenu.

5

Use the navigation pad to select one or more of the local measurement parameters.

6

Push the navigation pad to display a dialog box.

7

Use the navigation pad to change the parameter.

8

Push the navigation pad. This closes the dialog box.

9

When completed, push the navigation pad and select icon (Done).

10

Push the navigation pad to confirm and exit the menu mode.

18.6  Displaying values in the result table

For the box and circle tools, you can set the camera to display the maximum, minimum, average, and area values in the result table.

Follow this procedure:

1

To select the measurement tool, touch the tool on the screen. The tool is now displayed with one or more handles.

2

Push the navigation pad—or touch and hold the tool. This displays a context menu.

3

Use the navigation pad to select icon (Max/Min/Avg).

4

Push the navigation pad. This displays a submenu.

5

Use the navigation pad to select one or more of the following:

  • Select icon (Max) to display the maximum value.
  • Select icon (Min) to display the minimum value.
  • Select icon (Avg) to display the average value.
  • Select (depending on the tool) icon or icon (Area) to display the area of an object within the measurement tool. Area measurements require that the laser is enabled (Settings > Device settings > Lamp & laser > Enable lamp & laser). For more information, see section 21.9 Measuring areas .
  • Select icon (Max & min markers) to display the maximum and minimum markers (the hot/cold spots).
6

Push the navigation pad to toggle the function between inactive and active.

7

When completed, push the navigation pad down to close the submenu.

8

Select icon (Done) and push the navigation pad.

18.7  Creating and setting up a difference calculation

A difference calculation gives the difference between the values of two known measurement results.

Follow this procedure:

1

To set up a difference calculation, do the following:

  • If you are defining user presets, select icon (Add measurement) and then select icon (Add delta).
  • If you are editing an image in the archive, select icon (Measurement) and then select icon (Add delta).
2

Push the navigation pad. This displays a dialog box where you can select the measurement tools that you want to use in the difference calculation. You can also select a fixed-temperature reference.

3

Push the navigation pad. The result of the difference calculation is now displayed on the screen.

18.8  Setting a measurement alarm

18.8.1  General

You can make the camera trigger an alarm when certain measurement conditions are met.

18.8.2  Types of alarm

You can choose between the following alarm types:
  • Above: Triggers an alarm when the temperature is above the preset alarm temperature.
  • Below: Triggers an alarm when the temperature is below the preset alarm temperature.

18.8.3  Alarm signals

When an alarm is set, the symbol icon is displayed in the result table.
When an alarm is triggered, the value in the result table is displayed in red (above alarm) or blue (below alarm) and the symbol icon (above alarm) or icon (below alarm) is blinking.
You can also set an audible alarm (there will be a “beep” when the alarm is triggered).

18.8.4  Procedure

There are different procedures for setting up an alarm for a spot, for a box or circle, and for a difference calculation.

18.8.4.1  Setting up an alarm for a spot

Follow this procedure:

1

To select the spot, touch the tool on the screen. The tool is now displayed with a frame.

2

Push the navigation pad—or touch and hold the tool. This displays a context menu.

3

Select icon (Set alarm on spot) and push the navigation pad. This displays a dialog box.

4

In the dialog box, you can define the settings for the alarm.

  • Alarm condition: The condition that triggers the alarm. Applicable values are Above, Below, or Off.
  • Alarm limit: The temperature value that will be the critical condition when an alarm is triggered or not.
  • Alarm sound: Applicable values are Beep or No sound.
5

Push the navigation pad. This closes the dialog box.

18.8.4.2  Setting up an alarm for a box or circle

Follow this procedure:

1

To select the measurement tool, touch the tool on the screen. The tool is now displayed with one or more handles.

2

Push the navigation pad—or touch and hold the tool. This displays a context menu.

3

Select icon (Set alarm) and push the navigation pad. This displays a dialog box.

4

In the dialog box, you can define the settings for the alarm.

  • Alarm condition: The condition that triggers the alarm. Applicable values are Above, Below, or Off.
  • Select measurement: Applicable settings are the values you have previously defined (Max, Min, and/or Avg).
  • Alarm limit: The temperature value that will be the critical condition when an alarm is triggered or not.
  • Alarm sound: Applicable values are Beep or No sound.
5

Push the navigation pad. This closes the dialog box.

18.8.4.3  Setting up an alarm for a difference calculation

To set up an alarm for a difference calculation, do the following:

1

If you are editing an image in the archive, select icon (Measurement).

2

Select icon (Select) and push the navigation pad. This displays a dialog box.

3

Select Delta and push the navigation pad. This displays a context menu.

4

Select icon (Set alarm on delta) and push the navigation pad. This displays a dialog box.

5

In the dialog box, you can define the settings for the alarm.

  • Alarm condition: The condition that triggers the alarm. Applicable values are Above, Below, or Off.
  • Alarm limit: The temperature value that will be the critical condition when an alarm is triggered or not.
  • Alarm sound: Applicable values are Beep or No sound.
6

Push the navigation pad. This closes the dialog box.