99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
testo 875i · Thermal imager
Instruction manual
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1 Contents
1 Contents
1 Contents ................................................................................................... 3
2 Safety and the environment .................................................................... 4
2.1. About this document ........................................................................ 4
2.2. Ensure safety ................................................................................... 5
2.3. Protecting the environment .............................................................. 6
3 Specifications .......................................................................................... 7
3.1. Use .................................................................................................. 7
3.2. Technical data ................................................................................. 8
4 Product description ............................................................................... 14
4.1. Overview........................................................................................ 14
4.2. Basic properties ............................................................................. 15
5 First steps .............................................................................................. 17
5.1. Commissioning .............................................................................. 17
5.2. Getting to know the product ........................................................... 19
6 Using the product .................................................................................. 25
6.1. Menu functions .............................................................................. 25
6.1.1. Measuring functions ....................................................................................... 25
Image gallery ................................................................................................. 28
6.1.2.
Scale... ........................................................................................................... 29
6.1.3.
Display... ........................................................................................................ 30
6.1.4.
6.1.5.
Emissivity... .................................................................................................... 31
Palette ........................................................................................................... 33
6.1.6.
Configuration ................................................................................................. 33
6.1.7.
6.2. Measuring ...................................................................................... 38
7 Maintaining the product ........................................................................ 41
8 Tips and assistance ............................................................................... 43
8.1. Questions and answers ................................................................. 43
8.2. Accessories and spare parts ......................................................... 44
3
2 Safety and the environment
2 Safety 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
Al
ays pay attention to information that is marked by the following
w
warnings with warning pictograms. Implement the specified
precautionary measures.
Representation Explanation
WARNING
NOTICE
Symbols and writing standards
Represen-
tation
1. ...
2. ...
> ... Action: a step or an optional step.
- ... Result of an action.
Menu Elements of the instrument, the instrument displays
4
Indicates potential serious injuries
indicates circumstances that may lead to
damage to the products
nation
Expla
Note: Basic or further informat
Action: more steps, the sequence must be followed.
or the program interface.
ion.
2 Safety and the environment
Represen-
Explanation
tation
[OK] Control keys of the instrument or buttons of the
program interface.
... | ... Functions/paths within a menu.
2.2. Ensure safety
“...” Example entries
> 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.
> The objects to be measured or the measurement environment
may also pose risks: 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 dir ections 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 obj ects.
• 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.
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2 Safety and the environment
• Only charge in the instrument or the recommended charging
station.
• Immediately stop the charging process if this is not
comple
ted 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
instrume
nt to avoid e
xhaustive 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.
Test Equipment Depot - 800.517.8431
99 Washington Street, Melrose, MA 02176
6
TestEquipmentDepot.com
3 Specifications
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)
3 Specifications
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.
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3 Specifications
3.2. Technical data
Infrared image output
Characteristic Values
Field of vision/min.
focusing distance
Thermal sensitivity
(NETD)
Geometric resolution
Refresh rate
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
Image size 640 x 480 pixels
Refresh rate 8 to 15 Hz
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)
<50 mK at 30 °C (86 °F)
Standard lens: 3.3 mrad
Telephoto lens: 1 mrad
33 Hz within EU and countries approved for
export, else 9 Hz
33° x 25°/0.4 m (1.31 ft)
Image presentation
Characteristic Values
Image display 3.5" LCD with 320 x 240 pixels
Display options
Video stream 25 Hz
Colour palettes 10 options
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Infrared image/real image/infrared and real
image
Measuring
Characteristic Values
Measuring range
(can be
changed)
Accuracy
Extended
display range
Reproducibility
Measuring point
minimum
diameter
Measuring range 1, instruments up to serial
number 02602262 (see type plate):
-20 - 100 °C (-4 - 212 °F)
Measuring range 1, instruments from serial
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)
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
Values with no guarantee of accuracy, prefixed
with a tilde (~) on the display. Only for
instruments from serial number 02602263 (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)
±1 °C (±1.8 °F) or ±1 % (whichever is the
greater)
Standard lens: 10 mm at 1 m
Telephoto lens: 3 mm at 1 m
3 Specifications
9
3 Specifications
Characteristic Values
On-time (time to
image)
Humidity and
ambient
temperature
measurement
with radio probe
(optional, only
testo 875-2i)
Accuracy of
radio probe
(optional, only
testo 875-2i)
Measuring
functions
Compensation
for reflected
temperature
Setting
emissivity
30 s
0…100%rF,
-20…70°C (-4…158°F)
±2%rF,
±0,5°C (0,9°F)
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)
manual
0.01…1.00
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Image storage
Characteristic Values
File format .bmt
Export options in .bmp, .jpg, .csv
Removable memory SD card
Memory capacity
Scope of delivery: 2 GB (approx. 1000
images)
3 Specifications
Lens
Characteristic Values
Standard lens 32° x 23°
Telephoto lens
(optional,
testo 875-2i only)
Aperture 0.84
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Laser measuring spot marking
Not available in USA, Japan, China.
Characteristic Values
Classification of the
635 nm, Class 2
laser
Audio functions (testo 875i-2 only)
Characteristic Values
Sound
recording/playback
Recording period max. 30 s per image
9° x 7°
via headset (included in delivery)
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3 Specifications
Power supply
Characteristic Values
Battery type
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
Ambient conditions
Characteristic Values
Operating
-15 - 40 °C (5 - 113 °F)
temperature
Storage
-30 - 60 °C (-22 - 140 °F)
temperature
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
Vibration max. 2 G
Fast-charging, Li-ion battery can be
changed on-site
5 V/4 A
IP54 (Interface terminals closed, battery
connected, lens mounted, softcase
mounted)
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Standards, tests, warranty
Characteristic Values
EU Directive 2004/108/EC
Vibration IEC 60068-2-6
Warranty
2 years
3 Specifications
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4 Product description
4 Product description
4.1. Overview
Product components
1 Display.
2 Control keys:
Key Functions
[]
[OK] and Joystick
Switch the imager on/off.
• Press [OK]:
Open menu, confirm selection/setting.
• Move [OK] up/down/right/left = Joystick
function:
Select functions, navigate
[Esc]
Left/right ["xy"]
quick select button
Cancel action.
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.
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