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Testo 871 [32/52] Setting emissivity and reflected temperature
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7 Performing the measurement
32
7.5 Setting emissivity and reflected
temperature
This function is only available if the Image type is set to infrared image.
You can choose between user-defined emissivity and 8 materials with
permanently set emissivity. The reflected temperature (RTC) can be set
individually.
Other materials can be imported into the instrument from an existing
list using the PC software.
Emissivity information:
The emissivity describes the capability of a body to emit electromagnetic
radiation. This is material-specific and must be adapted for correct
measurement results.
Non-metals (paper, ceramic, gypsum, wood, paints and coatings), plastics and
food have high emissivity, which means that the surface temperature can be
easily measured using infrared.
Because of their low or non-uniform emissivity, bright metals and metal oxides
only have limited suitability for infrared measurement. Highly inaccurate
measurements should be expected. A remedy for this is coatings that increase
emissivity, e.g. paint or emission adhesive (accessory: 0554 0051), which must
be applied to the object to be measured.
The following table gives typical emissivities of important materials. These
values can be used as a guide for user-defined settings.
Material (material temperature) Emissivity
Aluminium, bright rolled (170 °C) 0.04
Cotton (20 °C) 0.77
Concrete (25 °C) 0.93
Ice, smooth (0 °C) 0.97
Iron, emery-ground (20 °C) 0.24
Iron with casting skin (100 °C) 0.80
Iron with rolling skin (20 °C) 0.77
Gypsum (20 °C) 0.90
Glass (90 °C) 0.94
Rubber, hard (23 °C) 0.94
Rubber, soft grey (23 °C) 0.89
Содержание
- Instruction manual 1
- Testo 871 thermal imager 1
- Contents 3
- Safety 5
- Safety and waste disposal 5
- Zu diesem dokument 5
- Safety and waste disposal 6
- Safety and waste disposal 7
- Waste disposal 7
- Bluetooth module 8
- General technical data 8
- Technical data 8
- Technical data 9
- Technical data 10
- Technical data 11
- Description of the instrument 12
- Instrument operating elements overview 12
- Description of the instrument 13
- Displays overview 13
- Description of the instrument 14
- Power supply 14
- Initial operation 15
- Operation 15
- Switching instrument on and off 15
- Getting to know the menu 16
- Operation 16
- Operation 17
- Quick select button 17
- Operation 18
- Activating disabling the connection 19
- Wlan connection using the app 19
- Establishing a connection 20
- Select display 20
- Using the app 20
- Wlan connection using the app 21
- Bluetoot 22
- Bluetooth connection 22
- Connection 22
- Bluetooth connection 23
- Performing the measurement 24
- Performing the measurement 25
- Saving an image 25
- Performing the measurement 26
- Setting measuring functions 26
- Image gallery 27
- Performing the measurement 27
- Performing the measurement 28
- Performing the measurement 29
- Performing the measurement 30
- Setting the scale 30
- Performing the measurement 31
- Performing the measurement 32
- Setting emissivity and reflected temperature 32
- Performing the measurement 33
- Selecting the emissivity 33
- Customizing the emissivity 34
- Performing the measurement 34
- Setting the rtc 34
- Setting ε assist 34
- Activating humidity solar or electrical mode 35
- Image type 35
- Performing the measurement 35
- Selecting the colour palette 35
- Activating the differential temperature 36
- Performing the measurement 36
- Configuration 37
- Performing the measurement 37
- Settings 37
- Performing the measurement 38
- Save jpeg function 38
- Superresolution 38
- Ambient conditions 39
- Connectivity 39
- Performing the measurement 39
- Fullscreen mode 40
- Performing the measurement 40
- Reset options 40
- Performing the measurement 41
- Changing the rechargeable battery 42
- Charging the rechargeable battery 42
- Maintenance 42
- Maintenance 43
- Cleaning the instrument 44
- Maintenance 44
- Questions and answers 45
- Tips and assistance 45
- Accessories and spare parts 46
- Tips and assistance 46
- Authorizations and certification 47
- Authorizations and certification 48
- Authorizations and certification 49
- Authorizations and certification 50
- Authorizations and certification 51
- 8710 en 01 52
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