TESTO 875-2i pro User manual

testo 875i · Thermal imager
Instruction manual

2

1 Contents
3
1Contents
1Contents ...................................................................................................3
2Safety and the environment....................................................................4
2.1. About this document........................................................................4
2.2. Ensure safety...................................................................................5
2.3. Protecting the environment..............................................................6
3Specifications ..........................................................................................7
3.1. Use ..................................................................................................7
3.2. Technical data .................................................................................8
4Product description...............................................................................13
4.1. Overview........................................................................................13
4.2. Basic properties.............................................................................14
5First steps ..............................................................................................15
5.1. Commissioning ..............................................................................15
5.2. Getting to know the product...........................................................17
6Using the product..................................................................................23
6.1. Menu functions ..............................................................................23
6.1.1. Measuring functions....................................................................................... 23
6.1.2. Image gallery .................................................................................................26
6.1.3. Scale..............................................................................................................28
6.1.4. Display........................................................................................................... 28
6.1.5. Emissivity.......................................................................................................29
6.1.6. Palette ...........................................................................................................31
6.1.7.Configuration .................................................................................................31
6.2. Measuring......................................................................................36
7Maintaining the product ........................................................................39
8Tips and assistance...............................................................................40
8.1. Questions and answers .................................................................40
8.2. Accessories and spare parts .........................................................41

2 Safety and the environment
4
2Safety and the environment
2.1. About this document
Use
> Please read this documentation through carefully and
familiarize 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 when
necessary.
> 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
Explanation
WARNING
Indicates potential serious injuries
NOTICE indicates circumstances that may lead to
damage to the products
Symbols and writing standards
Represen-
tation
Explanation
Note: Basic or further information.
1. ...
2. ...
Action: more steps, the sequence must be followed.
> ... Action: a step or an optional step.
- ... Result of an action.
Menu Elements of the instrument, the instrument displays
or the program interface.

2 Safety and the environment
5
[OK] Control keys of the instrument or buttons of the
program interface.
... | ... Functions/paths within a menu.
“...” Example entries
2.2. Ensure safety
> Only operate the product properly, for its intended purpose and
within 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 other
sources of intense radiation (e.g. objects with temperatures greater
than 500 °C, 800 °C while using the high-temperature filter) during
operation. This may lead to serious damage to the detector. The
manufacturer accepts no warranty for this type of damage to the
microbolometer detector.
> Dangers may also arise from the systems being measured or
the measuring environment: Note the safety regulations valid in
your area 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 the
prescribed 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 the
event of contact with battery acid: Thoroughly wash affected
area with water and consult a doctor, if necessary.
• Only charge in the instrument or the recommended charging
station.

2 Safety and the environment
6
• Immediately stop the charging process if this is not
completed in the given time.
• In the event of improper function or signs of overheating,
immediately remove the rechargeable battery from the
measuring instrument/charging station. Caution:
Rechargeable battery may be hot!
• During longer breaks, remove the battery from the
instrument to avoid exhaustive discharge.
2.3. Protecting the environment
> Dispose of faulty rechargeable batteries/spent batteries in
accordance 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.

3 Specifications
7
3Specifications
3.1. Use
The testo 875i is a handy and robust thermal imager. It opens the
door 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 electrical
inspection of systems and machines
• Production monitoring (quality assurance): Monitoring
production processes
The testo 875i is available in several versions, which are tailored to
various usage requirements:
• testo 875-1i: High-quality wide-angle lens 32° x 23, detector
160 x 120, NETD < 50 mK, 2 GB SD card for approx. 1000
images, minimum focus distance 10 cm, integrated digital
camera
• testo 875-2i: High-quality wide-angle lens 32° x 23°, detector
160 x 120, NETD < 50 mK, 2 GB SD card for approx. 1000
images, minimum focus distance 10 cm, integrated digital
camera with power LEDs for illumination, isotherm, min./max.
on area, audio comments, display of surface moisture
distribution (real-time display with optional radio humidity
probe), high-temperature filter (optional)
Export control
Thermal imagers may be subject to the export restrictions of the
European Union.
The testo 875i with 33 Hz in particular can only be exported to
countries outside of the European Union with an export permit from
the authorities.
Please observe the national regulations for export control when
exporting.

3 Specifications
8
3.2. Technical data
Infrared image output
Characteristic
Values
Field of vision/min.
focusing distance
Standard lens: 32° x 23°/0.1 m (0.33 ft)
Telephoto lens (testo 875-2i only, optional):
9° x 7° / 0.5 m (1.64 ft)
Thermal sensitivity
(NETD)
<50 mK at 30 °C (86 °F)
Geometric resolution Standard lens: 3.3 mrad
Telephoto lens: 1 mrad
Refresh rate 33 Hz within EU and countries approved for
export, else 9 Hz
Focus Manual
Detector type FPA 160 x 120 pixels, a.Si
Spectral range 8 - 14 μm
Visual image output
Characteristic
Values
Field 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 Values
Image display 3.5" LCD with 320 x 240 pixels
Display options Infrared image/real image/infrared and real
image
Video stream 25 Hz
Colour palettes 10 options

3 Specifications
9
Measuring
Characteristic
Values
Measuring range
(can be
changed)
Measuring range 1, instruments up to serial
number 02602262 (see type plate):
-20 - 100 °C (-4 - 212 °F)
Measuring range 1, instruments up to number
02602263 (see type plate):
-30 - 100 °C (-22 - 212 °F)
Measuring range 2:
0 - 350 °C (32 - 662 °F)
Measuring range 3 (optional, testo 875-2i only):
350 - 550 °C (662 - 1022 °F)
Accuracy Measuring range 1@ -20 - 100°C (-4 - 212°F):
±2 °C (±3.6 °F)
Measuring range 1 @ -30 - -21°C (-22 - -5°F),
instruments from serial number 02602263 (see
type plate):
±3°C (±5.4°F)
Measuring range 2: ±2 °C (±3.6 °F) or ±2 % of
reading (higher value applies)
Measuring range 3 (optional, testo 875-2i only):
±3 % of reading
Information valid for values within the specified
measuring range + tolerance
Extended
display range
Values with no guarantee of accuracy, prefixed
with a tilde (~) on the display. Only for
instruments from production date ??? (see type
plate):
Measuring range 1:
-50…-33°C (-58…-27,4°F)
Measuring range 2:
-10…-2°C (14…28,4°F)
Measuring range 3:
0…340°C (32…644°F)
Reproducibility ±1 °C (±1.8 °F) or ±1 % (whichever is the
greater)
Measuring point
minimum
diameter
Standard lens: 10 mm at 1 m
Telephoto lens: 3 mm at 1 m

3 Specifications
10
Characteristic Values
On-time (time to
image)
30 s
Humidity and
ambient
temperature
measurement
with radio probe
(optional, only
testo 875-2i)
0…100%rF,
-20…70°C (-4…158°F)
Accuracy of
radio probe
(optional, only
testo 875-2i)
±2%rF,
±0,5°C (0,9°F)
Measuring
functions
Standard measurement (1-point), 2-point
measurement, Cold-/Hotspot, solar (manual
entry of the radiation intensity)
Also with testo 875-2i: isotherm, min./max. on
area, Display of humidity image via manual entry
of the ambient humidity / temperature (real-time
display with optional radio humidity probe)
Compensation
for reflected
temperature
manual
Setting
emissivity
0.01…1.00
Image storage
Characteristic Values
File format .bmt, .jpg
Export options in .bmp, .csv
Removable memory SD card
Memory capacity Scope of delivery: 2 GB (approx. 1000
images)

3 Specifications
11
Lens
Characteristic Values
Standard lens 32° x 23°
Telephoto lens
(optional,
testo 875-2i only)
9° x 7°
Aperture 0.84
w
Laser measuring spot marking
Not available in USA, Japan, China.
Characteristic Values
Classification of the
laser
635 nm, Class 2
Audio functions (testo 875i-2 only)
Characteristic
Values
Sound
recording/playback
via headset (included in delivery)
Recording period max. 30 s per image
Power supply
Characteristic Values
Battery type Fast-charging, Li-ion battery can be
changed 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

3 Specifications
12
Ambient conditions
Characteristic Values
Operating
temperature
-15 - 40 °C (5 - 113 °F)
Storage
temperature
-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 G
Standards, tests, warranty
Characteristic Values
EU Directive
2014/30/EC
Vibration IEC 60068-2-6

4 Product description
13
4Product 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 to
the quick select button at any one time is
shown in the display.
3 Instrument rechargeable battery lock release button.

4 Product description
14
4 Metric thread: For fastening the included tripod adapter.
Do not use desktop tripods, danger of tilting!
5 Right interface terminal: Radio module compartment.
6 2 LEDs: For illumination for the visual image (testo 875-2i only).
7 Digital camera lens: For recording visual images
8 Laser (not available in all countries): For aiming at the
measuring field.
Laser radiation. Do not look into the beam.
CLASS 2 LASER
9 Infrared camera lens: For recording thermography images.
Exchangeable lens (testo 875-2i only).
10 Rotating ring Manual focusing: For manual focusing.
11 Lens lock ring
12 [Trigger]: For recording (freezing/saving) images.
13 Left interface terminal: Memory card slot. Headset slot. USB
interface. Mains socket, for connecting the included mains unit.
Buffer battery slot.
14 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) to
maintain the system data during an interruption in the power
supply (e.g. when the battery is changed).

5 First steps
15
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 attached
real image, BMP for real image, .jpg.
Save JPEG function
Infrared images are saved in BMT (image with all temperature data)
format. The image is saved in parallel in JPEG format (without
temperature data). The image content corresponds to the infrared
image shown on the display, including scale display and image marks
for the selected measuring functions. The JPEG file is saved under
the same file name as the associated BMT file and can be opened on
the PC, even without using the IRSoft PC software.
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.

5 First steps
16
Perform basic settings
> Remove the protective film from the display.
- The start screen appears on the display.
- The Landeseinstellungen (Country settings) dialogue is
opened.
Instrument language (Language) and temperature unit (Unit) can
be 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.
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 can
remain switched on or be switched off. This has no effect
on the length of the charging process.
- The charging of the rechargeable battery begins.

5 First steps
17
- 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 is
ready for operation.
Charging the battery is also possible using a desktop charging
station (accessory).
Rechargeable battery care:
• Do not fully exhaust rechargeable batteries.
• Store rechargeable batteries only in charged condition
and at low temperatures, but not below 0°C (best
storage 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 and
recharge the batteries every 3-4 months. Trickle
charging should not exceed 2 days
5.2. Getting to know the product
Insert 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 to
release the lock.
Inserting a radio module (accessory, testo 875-2i only)
Using a radio module (accessory) the instrument can be connected
with a radio humidity probe. The radio module must be connected
before switching on the instrument in order for the instrument to be
identified.

5 First steps
18
Radio probes may only be used in countries in which
they are permitted (see separate instructions for use of
radio probe).
> Switch off instrument before inserting the radio module.
1. Open the cover on the right side of the thermal imager.
2. Release the lock (1) and open the retaining clip (2).
3. Insert radio module into the module slot (3).
> To remove the radio module: push radio module down slightly
and remove.
Attaching headset (testo 875-2i only)
1. Open the cover on the left side of the thermal imager.
2. Insert stereo jack of the headset into the headset slot (1).
Mount/remove infrared protection glass
Installation:
1. Attach the protection glass (with black fitting) 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.

5 First steps
19
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, see Optics..., page 32. If this option is
set incorrectly, the specified measuring accuracy is not ensured.
Mounting/removing high-temperature filter (testo 875-2i only)
Installation:
1. Attach the high-temperature filter (with red fitting) 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 high-temperature filter.
Removal:
1. Attach the red mounting ring to the high-temperature filter.
2. Turn the mounting ring anticlockwise and remove the high-
temperature filter.
Activate/deactivate the high-temperature measuring range (350.0 -
550.0 °C or 662.0 - 1022 °F), see Measuring range, page 26, after
mounting or removing the high-temperature filter, otherwise the
specified measuring accuracy is not ensured
Mount tripod adapter
Using the included tripod adapter, the imager can be fastened to
the testo tripod (accessory) or to a commercially available standard
tripod. With the tripod adapter mounted, the battery cannot be
changed!
1. Place the tripod adapter on the lower end of the handle and
screw on using the included Allen key (ISO 2936, size 4).
2. Slide thermal imager into the fastening plate of the testo tripod
and lock or fasten it to the commercially available standard
tripod (screw-type fastening).
Mounting Softcase
The Softcase combines the functions of instrument protection, Sun
Shield and carrying function (strap).
1. Set the Softcase on the imager from above (1) and pull both
sides of the Softcase down around the display (2).
2. Guide Velcro strip through the two plates (3) and close (4).

5 First steps
20
Changing lens
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 32.
> Switch instrument off before changing the lens.
> To keep the lens from falling out: Hold the instrument with the
lens pointing up.
1. Turn lens lock ring anticlockwise to the stop (approx. 2 cm).
2. Remove lens.
3. Insert new lens, taking care to align the white markings on the
lens 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 the
container and close it.
The following steps are only relevant for USA:
5. Note or remember the serial number (Serial no.) which is
displayed on the lens.
6. Press [].
If you have changed from a wide-angle to a telephoto lens or vice
versa:
- The information No lens/wrong lens appears.
> Press [OK] to confirm the information.
If you have changed between two wide-angle or two telephoto
lenses:
> [OK] | Configuration… | [OK] | Optics… | [OK].
- The dialog Optics opens.
7. Move joystick up/down to select the lens used.
- The lens selected is outlined in orange.