testo 875 · Thermal imager

Instruction manual2

1 Contents

1

Contents

1

Contents ...................................................................................................32

Safety and the environment....................................................................4

3

4

5

6

2.1.

About this document ........................................................................4

2.2.

Ensure safety...................................................................................5

2.3.

Protecting the environment..............................................................6

Specifications ..........................................................................................7
3.1.

Use ..................................................................................................7

3.2.

Technical data .................................................................................8

Product description...............................................................................11
4.1.

Overview........................................................................................11

4.2.

Basic properties.............................................................................12First steps ..............................................................................................13
5.1.

Commissioning ..............................................................................13

5.2.

Getting to know the product...........................................................15

Using the product ..................................................................................20
6.1.

Menu functions ..............................................................................20
6.1.1.
6.1.2.
6.1.3.
6.1.4.
6.1.5.
6.1.6.
6.1.7.

6.2.

Measuring functions.......................................................................................20
Image gallery .................................................................................................22
Scale..............................................................................................................24
Display...........................................................................................................25
Emissivity.......................................................................................................25
Palette ...........................................................................................................28
Configuration .................................................................................................28

Measuring......................................................................................32

7

Maintaining the product ........................................................................34

8

Tips and assistance...............................................................................36
8.1.

Questions and answers .................................................................36

8.2.

Accessories and spare parts .........................................................373

2 Safety and the environment

2

Safety and the environment

2.1.

About this document
Use> Please read this documentation through carefully andfamiliarize yourself with the product before putting it to use. Pay
particular attention to the safety instructions and warning advice
in order to prevent injuries and damage to the products.
> Keep this document to hand so that you can refer to it whennecessary.
> Hand this documentation on to any subsequent users of the
product.
Warnings
Always pay attention to information that is marked by the following
warnings with warning pictograms. Implement the specified
precautionary measures.
Representation
NOTICE

Explanation
indicates circumstances that may lead todamage to the products

Symbols and writing standards
Representation

Explanation
Note: Basic or further information.

1. ...

Action: more steps, the sequence must be followed.

2. ...

4> ...

Action: a step or an optional step.

-

Result of an action.

...

Menu

Elements of the instrument, the instrument displays
or the program interface.

[OK]

Control keys of the instrument or buttons of the
program interface.

... | ...

Functions/paths within a menu.

“...”

Example entries

2 Safety and the environment

2.2.

Ensure safety> Only operate the product properly, for its intended purpose andwithin the parameters specified in the technical data. Do not
use any force.
> Do not operate the instrument if there are signs of damage at
the housing, mains unit or feed lines.
The thermal imager must not be directed at the sun or othersources of intense radiation (e.g. objects with temperatures greaterthan 500 °C) during operation. This may lead to serious damage tothe detector. The manufacturer accepts no warranty for this type ofdamage to the detector.
> The objects to be measured or the measurement environment
may also pose risks: Note the safety regulations valid in yourarea when performing the measurements.
> Do not store the product together with solvents. Do not use any
desiccants.
> Carry out only the maintenance and repair work on this
instrument that is described in the documentation. Follow theprescribed steps exactly. Use only original spare parts from
Testo.
> Improper use of rechargeable batteries can lead to destruction
or injuries by means of current surges, fire or escaping
chemicals. The following instructions must be observed to avoid
such hazards:•

Only use in accordance with the directions in the instruction
manual.

•Do not short, take apart or modify.

•

Do not expose to heavy impacts, water, fire or temperatures
above 60 °C.

•

Do not store in the proximity of metal objects.

•

Do not use leaky or damaged rechargeable batteries. In theevent of contact with battery acid: Thoroughly wash affectedarea with water and consult a doctor, if necessary.

•

Only charge in the instrument or the recommended charging
station.

•

Immediately stop the charging process if this is notcompleted in the given time.

52 Safety and the environment

2.3.

•

In the event of improper function or signs of overheating,
immediately remove the rechargeable battery from themeasuring instrument/charging station. Caution:
Rechargeable battery may be hot!

•During longer breaks, remove the battery from the
instrument to avoid exhaustive discharge.

Protecting the environment> Dispose of faulty rechargeable batteries/spent batteries inaccordance with the valid legal specifications.
> At the end of its useful life, send the product to the separate
collection for electric and electronic devices (observe local
regulations) or return the product to Testo for disposal.

6

3 Specifications

3

Specifications

3.1.

Use
The testo 875 is a handy and robust thermal imager. It opens thedoor to contactless determination and illustration of the temperature
distribution on surfaces for you.
Typical areas of application are:•

Building inspection (heating, ventilation and air conditioning
trade, company technicians, engineering offices, experts):
Energy evaluation of buildings•

Preventative maintenance (servicing): Mechanical and electricalinspection of systems and machines•

Production monitoring (quality assurance): Monitoringproduction processes

The testo 875 is available in several versions, which are tailored tovarious usage requirements:•

testo 875-1: High-quality wide-angle lens 32° x 23, detector
160 x 120, manual focus, 2 GB SD card for approx. 1000
images, minimum focus distance 10 cm•

testo 875-2: High-quality wide-angle lens 32° x 23, detector
160 x 120, manual focus, 2 GB SD card for approx. 1000
images, minimum focus distance 10 cm, integrated digital
camera, exchangeable lens, display of surface moisture
distribution

Export control
Thermal imagers may be subject to the export restrictions of theEuropean Union.
Please observe the national regulations for export control whenexporting.

7

3 Specifications

3.2.

Technical data
Infrared image output
Characteristic

ValuesField of vision/min.
focusing distanceStandard lens: 32° x 23°/0.1 m (0.33 ft)

Thermal sensitivity(NETD)< 80 mK at 30 °C (86 °F)

testo 875-2 only (optional):
Telephoto lens: 9° x 7°/0.5 m (1.64 ft)

Geometric resolution Standard lens: 3.3 mrad
Telephoto lens: 1 mrad
Refresh rate

9 Hz

Focus

manualDetector type

FPA 160 x 120 pixels, a.Si

Spectral range

8 - 14 μm

Visual image output (testo 875-2 only)
Characteristic

ValuesField of vision/min.
focusing distance

33° x 25°/0.4 m (1.31 ft)

Image size

640 x 480 pixels

Refresh rate

8 to 15 Hz

Image presentation
Characteristic

ValuesImage display

3.5" LCD with 320 x 240 pixels

Display options

testo 875-1: Infrared image
testo 880-2: Infrared image/real
image/infrared and real image

8

Video output

USB 2.0

Video stream

9 Hz

Colour palettes

4 options

3 Specifications
MeasuringCharacteristic

ValuesTemperature range(can be changed)-20 - 100 °C/0 - 280°C (-4 - 212 °F/32 536°F)

Accuracy±2 °C (±3.6 °F) or ±2 % of reading(whichever is the greater)

Reproducibility±1 °C (±1.8 °F) or ±1 % (whichever is thegreater)

Measuring point
minimum diameterStandard lens: 10 mm at 1 m

On-time (time toimage)

30 s

Measuring functions

Standard measurement (1-point), Cold-/
Hotspot, Solar (manual entry of the radiation
intensity)

Telephoto lens: 3 mm at 1 m

testo 875-2: Display of the surface moisture
distribution via manual entry of the ambient
humidity/temperature
Compensation for
manualreflected temperature
Setting emissivity

0.01 - 1.00

Image storage
Characteristic

ValuesFile format.bmt
Export options in .bmp, .jpg, .csv

Removable memory

SD cardMemory capacity

Scope of delivery: 2 GB (approx. 1000
images)

Lens
Characteristic

ValuesStandard lens

32° x 23°

Telephoto lens (testo 9° x 7°
872-2 optional)
Aperture

1.0

9

3 Specifications
Power supply
Characteristic

ValuesBattery typeFast-charging, Li-ion battery can bechanged on-site

Operating time

approx. 4 h at 20 - 30 °C (68 - 86 °F)

Charging option

In instrument/in charging station (optional)

Mains operation

Yes, with mains unit 0554 8808

Mains unit output
voltage

5 V/4 A

Ambient conditions
Characteristic

ValuesOperatingtemperature-15 - 40 °C (5 - 113 °F)

Storagetemperature-30 - 60 °C (-22 - 140 °F)

Air humidity

20 - 80 %RH, not condensing

Physical features
Characteristic

Values

Weight

900 g (including battery)Dimensions

152 x 108 x 262 mm (5.98 x 4.17 x 10.31")

Tripod mounting

Yes, with adapter (included in delivery)

Housing

ABS

Enclosure rating of
the housing

IP54 (Interface terminals closed, battery
connected, lens mounted, Softcase
mounted)Vibration

max. 2 GStandards, tests, warranty
Characteristic

10

ValuesEU Directive

2004/108/EC

Vibration

IEC 60068-2-6

Warranty

2 years, warranty conditions: see website
www.testo.com/warranty

4 Product description

4

Product description

4.1.

Overview
Product components

1

Display.

2

Control keys:

Key

Functions[Switch the imager on/off.

][OK] and Joystick•Press [OK]:Open menu, confirm selection/setting.

•Move [OK] up/down/right/left = Joystick
function:
Select functions, navigate[Esc]

Cancel action.

Left/right ["xy"]quick select button

Call up a function. The function assigned tothe quick select button at any one time isshown in the display.

3

Instrument rechargeable battery lock release button.
11

4 Product description
4

Metric thread: For fastening the included tripod adapter.
Do not use desktop tripods, danger of tilting!

5

Right interface terminal: Not assigned

6

Digital camera lens: For recording visual images (testo 875-2
only)

7

Infrared camera lens: For recording thermography images.
Exchangeable lens (testo 875-2 only).

8

Rotating ring Manual focusing: For focusing manually.

9

Lens lock ring

10 [Trigger]: For recording (freezing/saving) images.
11 Left interface terminal: Memory card slot. USB interface. Mains
socket, for connecting the included mains unit. Buffer battery
slot.
12 Status LED: off (no mains unit connected), flashes (mains unit
connected and rechargeable battery charging), lights up (mains
unit connected and battery charging process completed).

4.2.

Basic properties
Voltage supply
The power is supplied to the instrument via an exchangeable
rechargeable battery or via the included mains unit.
With an attached mains unit, the power is supplied automatically
via the mains unit and the instrument's rechargeable battery is
charged (only at ambient temperatures from 0 to 45 °C).
Charging the battery is also possible using a desktop charging
station (accessory).
The instrument is equipped with a buffer battery (type CR 1632) tomaintain the system data during an interruption in the power
supply (e.g. when the battery is changed).
File formats and file names
The images are saved according to the following pattern:
XX_YYYYY.ZZZ
XX: IR for infrared image without attached real image, IV for
infrared image with attached real image, VI for real image.
YYYYY: 5-digit consecutive number
ZZZ (file extension): BMT for infrared image without/with attachedreal image, BMP for real image.

12

5 First steps

5First steps

5.1.

Commissioning
Connect rechargeable battery
The imager is delivered with a rechargeable battery that is inserted
in the rechargeable battery slot but not connected.
> Push the battery all the way into the rechargeable battery slot
until this is flush with the bottom of the handle.
The-

The thermal imager starts automatically.

Perform basic settings> Remove the protective film from the display.
-

The start screen appears on the display.

-

The Landeseinstellungen (Country settings) dialogue isopened.

Instrument language (Language) and temperature unit (Unit) canbe set.
1. Move Joystick up/down to select the desired option.
-

The selected option has an orange border.

2. Confirm the selection with [OK].
-The selected setting is highlighted orange ( ). The arrows ( )show that the setting can be changed.

3. Move Joystick up/down to change the setting.
4. Confirm the entry with [OK].
5. Confirm the settings with Übernehmen (Apply).
6. Press [] to switch off the thermal imager.

13

5 First steps

Initial charging of rechargeable battery
The thermal imager is delivered with a partially charged battery.
Completely charge the battery before use.
> Connect the country-specific adapter required for the existing
mains to the mains unit.
1. Open the cover on the left side of the thermal imager (1).
2. Connect the mains unit to the mains socket ( ) (2).

3. Connect the mains plug to a mains socket.
-

The thermal imager starts automatically.
When charging the rechargeable battery, the imager canremain switched on or be switched off. This has no effecton the length of the charging process.

-

The charging of the rechargeable battery begins.

-

The charge status is indicated on the status LED:•

LED flashes: Charging in process.

•

LED lights up: Battery charged, charging process finished.

4. Charge the rechargeable battery completely, then disconnect
the instrument from the mains unit.
-

After the initial charging of the battery, the thermal imager isready for operation.

Charging the battery is also possible using a desktop charging
station (accessory).

14

5 First steps

Rechargeable battery care:

5.2.

•

Do not fully exhaust rechargeable batteries.

•

Store rechargeable batteries only in charged condition
and at low temperatures, but not below 0°C (beststorage conditions with a charge level of 50-80%, at an
ambient temperature of 10-20°C, recharge completely
before use).

•

During longer breaks, you should discharge andrecharge the batteries every 3-4 months. Trickle
charging should not exceed 2 days

Getting to know the productInsert the memory card
1. Open the cover on the left side of the thermal imager.
2. Insert memory card (SD card) into the card slot (SD) (1).

> To remove the memory card: Press on the memory card torelease the lock.
Mount/remove infrared protection glass
Installation:
1. Attach the protection glass fastened to the red mounting ring to
the lens and turn the mounting ring clockwise to the stop.
2. Remove the red mounting ring from the protection glass.
Removal:
1. Attach the red mounting ring to the protection glass.
2. Turn the mounting ring anticlockwise and remove the protection
glass.
After mounting/removing the protection glass, activate or deactivate
the Protection glass option, Optics..., page 29. If this option is set
incorrectly, the stated measuring accuracy is not guaranteed.
15

5 First steps

Mount tripod adapter
Using the included tripod adapter, the imager can be fastened tothe testo tripod (accessory) or to a commercially available standard
tripod. With the tripod adapter mounted, the battery cannot bechanged!
1. Place the tripod adapter on the lower end of the handle andscrew on using the included Allen key (ISO 2936, size 4).
2. Slide thermal imager into the fastening plate of the testo tripodand lock or fasten it to the commercially available standard
tripod (screw-type fastening).
Mounting Softcase
The Softcase combines the functions of instrument protection andcarrying function (strap).
1. Set the Softcase on the imager from above (1) and pull bothsides of the Softcase down around the display (2).
2. Guide Velcro strip through the two plates (3) and close (4).

Changing lens (testo 875-2 only)
Only lenses that were adjusted to the respective thermal imager
can be used. The serial number on the lens must match the serial
number of the instrument, see Optics..., page 29.
> Switch instrument off before changing the lens.
> To keep the lens from falling out: Hold the instrument with thelens pointing up.
1. Turn lens lock ring anticlockwise to the stop (approx. 2 cm).
2. Remove lens.

16

5 First steps
3. Insert new lens, taking care to align the white markings on thelens and the instrument with one another.
4. Turn the lens lock ring clockwise to the stop.
Always store lenses not in use in the container designed for this in
the case.
> Turn the lens ring clockwise to the stop, place the lens in thecontainer and close it.
Switch the imager on/off
1. Remove protection cap from the lens.
].

2.

Press [-The start screen appears on the display. The type designationof the imager and the firmware version are shown.

-

The measurement view is opened after the warm-up period.

-

The imager performs an automatic zeroing approx. every 60
sec. This can be recognized by means of a "click". The image isfrozen briefly when this occurs.

> To switch off: Press [-].

The display goes out and the imager is switched off.

Manually focusing the image> Turn Rotating ring of the lens until the image is in focus.
Record (freeze/save) image
1. Press [Trigger].
-

The image is frozen (fixed image).

If the image is to be saved, the desired storage location can be set
using the left [Folder] quick select button, see Select the storage
location (folder): page 33.
testo 875-1:•

Infrared image is shown: Infrared image is saved.

testo 875-2:•

Infrared image or infrared/real image is shown: Infrared image
is saved, real image is saved in the same file as an attachment
to the infrared image.

•Real image is shown: Real image is saved.

17

5 First steps
2. Save image: Press [Trigger] again, or: Press [OK].
orDiscard image: Press [ESC].
Getting to know the quick select buttons
The quick select buttons can be assigned functions that are
required often so that you can call them up directly.
Factory settings:•

Left quick select button: [Scale].

•

Right quick select button: [Palette] (testo 875-1) or [Imagetype] (testo 875-2).

Changing assignment of the quick select buttons
1. Move Joystick left or right to open the Configure key function
list for the left or right quick select button.
2. Move Joystick up/down to select the desired function.
Function

Description

Image type
(testo 875-2 only)

Change display mode: Infrared image, real
image or infrared/real image. 1

PaletteChange colour palette for the infrared
image.

Emissivity...

Set emissivity and reflected temperature.

Scale...

Set scale limits.

Adjustment

Perform manual zero point calibration.

3. Press [OK] to activate the selected function.
Navigating in the menu
1. Press [OK] button.
-

The Menu is opened.

2. Select navigation/function:

1•

Move Joystick up or down to select the menu item.

•

Press [OK] to confirm the selection. Or for menu items thatare marked with an arrow (►): Move Joystick to the right.

Real image and infrared lens have a different angle of view due to the spacial
separation. The image areas therefore do not correspond completely (parallax
error).

18

5 First steps-•

Move Joystick to the left to return to the previous menu
level.

•

Press [OK] to select the function.

•

Press [ESC] to cancel the process and change to
Measuring Mode.

Depending on the selected menu item, press [OK] to perform asetting or open a submenu/dialogue, see Menu functions, page20.

19

6 Using the product

6

Using the product6.1.

Menu functions

6.1.1.

Measuring functions
1-point measurement
The 1-point measurement is the standard measuring function. If
this is activated (), all available options can be selected via thequick select buttons.
> [OK] | Measurement | [OK] | 1-point measurement | [OK].
testo 875-2 only:
If the 1-point measurement is activated, the crosshairs can be
moved using the Joystick on frozen and saved images to read off
the individual temperatures.
With saved images, the 1-point measurement must be activated
via the menu for the respective opened image.
Cold-/Hotspot
Cold-/Hotspot shows the minimum and maximum temperature), the quick
point on the display. If Cold-/Hotspot is activated (select buttons with the Coldspot and Hotspot functions can bepermanently assigned and can no longer be changed.
With frozen images, the crosshairs can be moved and themin./max. point is visible. The min./max. point is not saved.
With saved images, Cold-/Hotspot must be activated for therespective opened image.
> [OK] | Measurement | Cold-/Hotspot | [OK].
> Select left or right Coldspot or Hotspot quick select button toactivate/deactivate the respective function.

20

6 Using the product
Humidity (testo 875-2 only from firmware 1.22)
The ambient temperature and humidity values entered manuallyare used to calculate the relative surface moisture for each pixel.
The values are shown as a humidity image. The special colour
palette indicates which areas are at risk of mould:
Colour

Surface moisturegreen

0…64%RH

Assessment
non-criticalyellow/ora 65…80%RH
nge

potentially criticalredcritical>80%RH

If this function is enabled (), the shortcut buttons arepermanently assigned the functions Humidity and Emission
level….
The values for relative humidity and ambient temperature areshown at the top of the display.
1. [OK] | Measurement | [OK] | Humidity | [OK].
-The Humidity dialogue box is opened. The values for theambient temperature and humidity can be entered.

2. Move Joystick up/down to select the desired option.
-

The selected option has an orange border.

3. Confirm the selection with [OK].
-The selected number is highlighted orange.

4. Move Joystick up/down to set the desired value. Move
Joystick right/left to change between the numbers.
5. Confirm the entry with [OK].
6. Confirm the settings with Apply.

21

6 Using the productSolar (from firmware 1.22)
To detect and document failures in photovoltaic systems, the solar
function can be selected. The sun's radiation intensity measured(with an external instrument) can be entered for documentation
purposes. This value is saved with the IR- image.
If this function is enabled (), the shortcut buttons arepermanently assigned the functions Intensity and Hotspot.
The radiation intensity value is shown at the top of the display.
1. [OK] | Measurement functions | [OK] | Solar | [OK].
-The Solar dialogue box is opened. The radiation intensity value
can be entered.

2. Confirm selection with [OK].
-The selected number is highlighted orange.

3. Move Joystick up/down to set the required value. Move
Joystick right/left to switch between the numbers.
4. Confirm entry with [OK].
5. Confirm settings with [Apply].
Measuring range
The measuring range can be set to adapt to the respective area of
application.
1. [OK] | Measurement | [OK] | Measurement range.
2. Select the desired temperature range and confirm with [OK].
Depending on the scene temperature, the measuring range
may be undershot or exceeded. In this case, --- or +++ isshown instead of the readings.
> If this occurs, change the measuring range.

6.1.2.

Image gallery
Show images…
1. [OK] | Image gallery | [OK] | Show images… | [OK].

22-

The Folder dialogue is opened.

-

The folder name of the opened folder is displayed in the header.
ROOT designates the base folder (top level).

-

The saved data is shown as preview images (image overview).
The image saved last is shown directly behind the folders.

6 Using the productOptional:> Press the right [Page scroll] quick select button to change topage scroll.
In page scroll, you can navigate in groups of 3 x 3images/folders (page by page). To select/open an image/folder,
you must change back into Single Image.
2. Navigate:•

In page scroll: Move Joystick up/down to change between
the pages.

•

In single image: Move Joystick up/down/left/right to select apreview image/a folder (orange border).

•Open selected folder with [OK].

3. In single image: Press [OK] to open selected preview image.
Press Gallery to return to the image overview.
Delete image
1. In single image: Select image (orange border) or select andopen image.
2. Press Delete to delete the selected or open image.
-

A confirmation request appears as to whether the image should
really be deleted.

3. Confirm with [OK] or cancel process with [Esc].
Create new folder
1. In the Folder dialogue: Select New Folder with the joystick andconfirm with[OK].
-The Folder name dialogue is opened.

2. Name folders: Use the Joystick to select the desired lettersand confirm with[OK].
The folder name can consist of up to 8 characters.
Incorrect entries can be deleted using the right [◄C] quick selectbutton.
3. Press left [Create Folder] quick select button to create thefolder.

23

6 Using the product
Erase all
1. [OK] | Image gallery | [OK] | Erase all… | [OK].
-A confirmation request appears as to whether all files on thememory card should be deleted. Folders are not deleted.

2. Confirm erase with [OK] or cancel process with [Esc].

6.1.3.

Scale...
Set scale limits
You can choose between auto-scaling (continuous, automatic
adjustment to the current min./max. values) and manual scaling.
The scale limits can be set within the activated measuring range(see Measuring range, page 22). All temperatures that undershootor exceed the limit value are shown in the colour of the limit value(depending on the selected colour palette, see Palette, page 28).
Temperature ranges that are not relevant can thus be hidden.
1. [OK] | Scale… | [OK].
-The Set scale dialogue is opened.

2. Move Joystick left/right to select the desired option: Autoscaling ( ), min. value ( ), temperature range ( ) or max.
value ( )-The selected option has an orange border ( ).

3. With the selection of min. value, temperature range or max.
value: Move Joystick up/down to change the value(s).
-Changes are applied immediately so that the effects on thedisplay of the infrared image can be checked directly.

4. Close dialogue with [OK] or [Esc].
-24

The changes are saved.

6 Using the product6.1.4.

Display...
Select display options
The presentation can be adapted by means of showing/hiding thefollowing elements: Crosshairs, temperature scale and quick selectbuttons.
Hidden function keys can be shown again by pressing a quick
select button: The first press of the button shows the function keys
again. To trigger a function, the button must be pressed again.
1. [OK] | Display… | [OK].
-The Display options dialogue is opened.

2. Move Joystick up/down to select the desired option.
-

The selected option has an orange border ( ).

3. Activate () or deactivate () option with [OK].

4. Confirm settings with the [Apply] quick select button.
or
Discard settings with [Esc].

6.1.5.

Emissivity...
Emissivity
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 thesurface temperature can be easily measured using infrared.
Because of their low or non-uniform emissivity, bright metals andmetal oxides are only somewhat suited for infrared measurement.
You must anticipate highly inaccurate measurements. A remedy forthis is coatings that increase the emissivity, e.g. paint or emission
adhesive (art. no. 0554 0051) which must be applied to the object
being measured.

25

6 Using the product
The following table gives typical emissivities of important materials.
These values can be used as orientation with the user-definedsettings.
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

Wood (70 °C)

0.94

Cork (20 )0.70

Radiator, black anodised (50 °C)

0.98

Copper, slightly tarnished (20 °C)

0.04

Copper, oxidized (130°C)

0.76

Plastics: PE, PP, PVC (20 °C)

0.94

Brass, oxidized (200°C)

0.61

Paper (20 °C)

0.97

Porcelain (20 °C)

0.92Black paint, matt (80 °C)

0.97

Steel, heat-treated surface (200 °C)

0.52

Steel, oxidized (200 )0.79

Clay, burnt (70 °C)

0.91

Transformer paint (70 °C)

0.94

Brick, mortar, plaster (20 °C)

0.93

Reflected temperature
Using this offset factor, the reflection is calculated out due to thelow emissivity and the accuracy of the temperature measurement26

6 Using the productwith infrared instruments is improved. In most cases, the reflected
temperature is identical to the ambient air temperature. Only when
objects with strong emissions with much higher temperatures (suchas ovens or machines) are in the proximity of the object being
measured should the radiation temperature of theses heat sources
be determined and used (e.g. using a globe thermometer). The
reflected temperature has only little effect on objects with highemissivity.
Set emissivity/reflected temperature
You can choose between a user-defined emissivity and 8 materials
with recorded emissivities.
The reflected temperature can be set individually.
The designation of the materials in the selection list is
configured during commissioning of the thermal imager inthe language selected by the user. A translation does notoccur in the event of subsequent changeover of thelanguage in the instrument.
Using the PC software, other materials can be imported into
the instrument from an existing list. The language for thematerials here depends on the operating system languageof the PC.
1. [OK] | Emissivity… | [OK].
-The Emissivity dialogue is opened.

2. Move Joystick up/down to select the desired material.
-

The selected material is highlighted orange ( ). The
corresponding emissivity is shown to the right next to thematerial.

3. Move Joystick to the right to switch to the setting of theemissivity (only available when selecting User defined) or to
Reflected temp..
-

The selected option has an orange border ( ).

4. Confirm the selection with [OK].
-The selected number is highlighted orange ( ).

5. Move Joystick up/down to set the desired value. Move
Joystick right/left to change between the numbers.
6. Confirm the entry with [OK].

27

6 Using the product7. Confirm the settings with Apply.

6.1.6.

-

The changes are saved.

-

The selected emissivity ( ) is shown at the bottom right in thedisplay in measurement view.

PaletteChange colour palette for the infrared image
You can choose between 4 existing palettes. The currently
activated option is marked with a tick ( ).
1. [OK] | Palette| [OK].
2. Move Joystick up/down to select the desired option.
3. Confirm the selection with [OK].

6.1.7.

Configuration
Time/date...
Time and date can be set. Time and date format are automaticallyset based on the selected instrument language.
1. [OK] | Configuration… | [OK] | Time/date… | [OK].
-The Set time/date dialogue is opened.

2. Move Joystick up/down to select the desired option.
-

The selected option has an orange border ( ).

3. Confirm the selection with [OK].
-The selected number is highlighted orange ( ).

4. Move Joystick up/down to set the value. Move Joystickright/left to change between the numbers.
5. Confirm the entry with [OK].
6. Confirm the settings with Apply.
Country settings…
Instrument language and temperature unit can be set.
1. [OK] | Configuration… | [OK].| Country settings… | [OK].
-The Country settings dialogue is opened.

2. Move Joystick up/down to select the desired option.
28

The selected option has an orange border ( ).

6 Using the product3. Confirm the selection with [OK].
-The selected setting is highlighted orange ( ).

4. Move Joystick up/down to change the setting.
5. Confirm the entry with [OK].
6. Confirm the settings with Apply.
Optics...
The lenses adjusted to the instrument are shown. Only the lenses
that are shown may be used.
> [OK] | Configuration… | [OK] | Optics… | [OK].
Using the Protection glass option, you can set whether an infrared
protection glass is used or not. Ensure the correct setting toprevent corruption of the measurement results.
> Press [OK] to activate (glass option.
-) or deactivate () the Protection

With the option activated, the protection glass symbol (shown in the bottom right of the display.

) isSuperResolution (optional)
SuperResolution is a technology to improve image quality. Eachtime an image is recorded, a sequence of images is saved on thethermal imager and used to calculate a higher-resolution image
with the aid of the PC software (no interpolation). The pixel countincreases by a factor of 4, while the geometric resolution (IFOV) is
improved by a factor of 1.6.
To use the function, the imager must be hand-held (no tripod).

29

6 Using the productThis function is available as an additional option (article
no. 0554 7806) and must be activated before it can beused.
Activate function:

You will receive an envelope with an access code
(identification code), which you should enter on thewebsite www.testo.com/upgrade.
When all necessary data has been entered, an
activation code is generated and can be used toactivate the function via the IRSoft PC software. Pleaseobserve the installation requirements and steps on thewebsite or in the email sent to you.
Activate/deactivate function:> [OK] | Configuration… | [OK] | SuperResolution | [OK].
When you save an image, an information window with the image
file name is displayed. If SuperResolution is activated (),
SuperResolution is also displayed after the file name.
Power-save options…
Options can be set to extend the rechargeable battery running time.
1. [OK] | Configuration… | [OK] | Power-save options… | [OK].
-30

The Power-save options dialogue is opened.

6 Using the product2. Move Joystick up/down to select the desired option.
-

The selected option has an orange border ( ).

3. Confirm the selection with [OK].
-LCD backlight: The selected setting is highlighted orange andcan be changed ( ).

> Move Joystick up/down to change the setting. Confirm theentry with [OK].
-Switch off LCD or Power off imager: The selected option canbe activated or deactivated.

> Press [OK] to activate (-) or deactivate () the function.

With the option activated, the length of time until shut-down
can be set.

> Move Joystick to the right and press [OK]. Move Joystickup/down to change the setting. Confirm the entry with [OK].
4. Confirm the settings with Apply.
Format…
The memory card can be formatted. During the formatting, all
saved data on the SD card is lost.
1. [OK] | Configuration… | [OK] | Format… | [OK].
-A confirmation request appears as to whether the memory cardshould really be formatted.

2. Confirm with [OK] or cancel process with [Esc].
Factory reset
The instrument settings can be reset to the factory settings.
Time/date and country settings are not reset.
Please note: After a factory reset, the numbering of images begins
anew. When saving images, images that have already been saved
and have the same number are overwritten!
> Transfer all saved images onto a PC before performing a reset
to prevent possible overwriting.
1. [OK] | Configuration… | [OK] | Factory settings… | [OK].
-A confirmation request appears as to whether the instrument
should really be reset to the factory settings.

2. Confirm reset with [OK] or cancel process with [Esc].

31

6 Using the product6.2.

Measuring
Important framework conditions
Please observe the following framework conditions in order toobtain significant measurement results.
Humidity measurement (testo 875-2 only):•

Pivot the separate humidity measuring instrument slightly toshorten the adjustment time. Avoid sources of interference (e.g.
breathed air).

Building thermography, investigating the building shell:•

Considerable temperature difference between inside andoutside required (ideal: > 15 °C/> 27 °F).

•

Consistent weather conditions, no intensive sunlight, no
precipitation, no strong wind.

To ensure the highest level of accuracy, the imager requires anequalization period of 5 minutes after being switched on.
Important settings
Before recording an image, check whether the protection glass
option is set correctly to prevent corruption of the measurement
results, see Optics..., page 29.
Before saving an image, ensure that it is focused correctly (infocus), see Manually focusing the image, page 17. Images that are
not in focus cannot be corrected retroactively!
To obtain precise readings, the emissivity and reflected
temperature must be set correctly, see Set emissivity/reflected
temperature, page 27. A subsequent adjustment is possible via thePC software as required.
With an activated auto scaling, the colour scale is continuously
adapted to the min./max. values of the current measurement
image. The colour that is to be assigned to a specific temperature
thereby changes constantly. To be able to compare multiple
images by means of the colouring, the scaling must be manually
set to fixed values, see Scale... page 24, or must be subsequently
adjusted to uniform values using the PC software.

32

6 Using the productSelect the storage location (folder):1. While an image is frozen (fixed image): Press the left [Folder]quick select button.
-

The Folder dialogue is opened.

To create a new folder, see Create new folder, page 23.
2. Select the desired folder with the joystick and open with [OK].
-The folder name of the opened folder is displayed in the header.

3. Press left [Apply] quick select button to select the opened
folder.

33

7 Maintaining the product7

Maintaining the product
Changing the battery
To prevent losing the instrument settings: Only change therechargeable battery when a buffer battery is inserted in the
instrument or the mains unit is connected.
1. Press lock release button.
-

The rechargeable battery is released and sticks out a little fromthe rechargeable battery slot. The locking function keeps thebattery from falling out.

2. Completely remove the battery from the rechargeable batteryslot.
3. Insert a new battery into the rechargeable battery slot until thisis flush with the bottom of the handle.
-

The thermal imager starts automatically.

Clean thermal imager> If the housing of the thermal imager is dirty, clean it with a damp
cloth. Do not use any aggressive cleaning agents or solvents!
Weak household cleaning agents and soap suds may be used.
Cleaning lens protection glass> Large dust particles can be removed with a clean opticalcleaning brush (available in specialized photography shops).
> Use a lens cleaning cloth for slight contamination. Do not use
rubbing alcohol!
Change buffer battery
To prevent losing the instrument settings: Only change the buffer
battery when a charged rechargeable battery is inserted or themains unit is connected.
1. Open the cover on the left side of the thermal imager.
2. Remove battery holder, including buffer battery, from the battery
slot.

34

7 Maintaining the product3. Remove empty battery from the holder and insert new battery(type CR 1632).
NOTICE
Incorrectly inserted batteries can lead to damage of the
product!
> When inserting the batteries, observe the polarity (label on thebattery holder).
4. Insert battery holder into the battery slot.

35

8 Tips and assistance8

Tips and assistance

8.1.

Questions and answers
Question

Possible causes/solution

Message Backup battery
empty or not present isshown.

1. Confirm the message with [OK].

Error No memory card
inserted! is shown.

Memory card defective or not inserted.

2. Change buffer battery, see
Change buffer battery, page 34.
1. Confirm the message with [OK].
2. Check or insert memory card.

Error Memory card full! is Insufficient memory present.
shown.
1. Confirm the message with [OK].
2. Insert new memory card.
Error No lens/wrong lens! 1. Switch off thermal imager.
is shown.
2. Check lens
> Change lens if necessary.
Message Charging notpossible! is shown.

Ambient temperature is outside thepermissible range for charging thebattery.
1. Confirm the message with [OK].
2. Keep to the permissible ambient
temperature.

Error Permissible
instrument temperature
exceeded! is shown.

1. Switch off thermal imager.
2. Let instrument cool off and keep tothe permissible ambient
temperature.

--- or +++ is shown instead Reading is outside of the measuringof the reading.
range.
> Change measuring range.
xxx is shown instead of the Reading cannot be calculated.
reading.
> Check parameter settings forplausibility.
If we could not answer your question, please contact your dealer or
Testo Customer Service. For contact details see the rear side ofthis document or the web page www.testo.com/service-contact36

8 Tips and assistance

8.2.

Accessories and spare parts
Description

Article no.

Lens protection glass

0554 8805

Rech. batt.

0554 8802

Desktop charging station

0554 8801

Tripod0554 8804

Mains unit

0554 8808

SD card0554 8803

USB cable

0449 0047

ISO calibration certificate for thermal
imager:•Calibration points 0 °C, 25 °C, 50 °C
in measuring range -20 °C - 100 °C

0520 0489•

Calibration points at 0 °C, 100 °C, 200°C in measuring range 0 °C to 280°C

0520 0490

For further accessories and spare parts, please refer to the productcatalogues and brochures or look up our website: www.testo.com

37

0970 8750 en 03 V01.22 en-GB