Testo 875-1 Operating Manual
testo 875 · 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...............................................................................12
4.1. Overview........................................................................................12
4.2. Basic properties.............................................................................13
5 First steps ..............................................................................................14
5.1. Commissioning ..............................................................................14
5.2. Getting to know the product...........................................................16
6 Using the product..................................................................................21
6.1. Menu functions ..............................................................................21
6.1.1. Measuring functions.......................................................................................21
6.1.2. Image gallery .................................................................................................22
6.1.3. Scale..............................................................................................................24
6.1.4. Display........................................................................................................... 24
6.1.5. Emissivity.......................................................................................................25
6.1.6. Palette ...........................................................................................................28
6.1.7. Configuration .................................................................................................28
6.2. Measuring......................................................................................30
7 Maintaining the product........................................................................32
8 Tips and assistance...............................................................................34
8.1. Questions and answers .................................................................34
8.2. Accessories and spare parts .........................................................35
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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
Always pay attention to information that is marked by the following
warnings with warning pictograms. Implement the specified
precautionary measures.
Representation Explanation
CAUTION
indicates circumstances that may lead to
damage to the products
Symbols and writing standards
Represen-
Explanation
tation
Note: Basic or further information.
1. ...
Action: more steps, the sequence must be followed.
2. ...
> ... 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
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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, power supply 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) during operation. This may lead to serious damage to
the detector. The manufacturer accepts no warranty for this type of
damage to the 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 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.
• Immediately stop the charging process if this is not
completed in the given time.
2 Safety and the environment
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2 Safety and the environment
• In the event of improper function or signs of overheating,
immediately remove the rechargeable battery from the
measuring instrument/charging station. Caution:
2.3. Protecting the environment
Rechargeable battery may be hot!
> 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.
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3 Specifications
3.1. Use
The testo 875 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 875 is available in several versions, which are tailored to
various 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
3 Specifications
Export control
Thermal imagers may be subject to the export restrictions of the
European Union.
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
Standard lens: 32° x 23°/0.1 m (0.33 ft)
testo 875-2 only (optional):
Telephoto lens: 9° x 7°/0.5 m (1.64 ft)
Thermal sensitivity
(NETD)
< 100 mK typically, < 110 mK at 30 °C
(86 °F)
Geometric resolution Standard lens: 3.3 mrad
Telephoto lens: 1 mrad
Refresh rate 9 Hz
Focus manual
Detector type FPA 160 x 120 pixels, a.Si
Spectral range 8 - 14 μm
Visual image output (testo 875-2 only)
Characteristic Values
Field of vision/min.
33° x 25°/0.4 m (1.31 ft)
focusing distance
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 testo 875-1: Infrared image
testo 880-2: Infrared image/real
image/infrared and real image
Video output USB 2.0
Video stream 9 Hz
Color palettes 4 options
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3 Specifications
Measuring
Characteristic Values
Temperature range
(can be changed)
Accuracy
-20 - 100 °C/0 - 280°C (-4 - 212 °F/32 536°F)
±2 °C (±3.6 °F) or ±2 % of reading
(whichever is the greater)
Reproducibility
±1 °C (±1.8 °F) or ±1 % (whichever is the
greater)
Measuring point
minimum diameter
On-time (time to
Standard lens: 10 mm at 1 m
Telephoto lens: 3 mm at 1 m
30 s
image)
Measuring functions
Standard measurement (1-point), Cold-/
Hotspot
testo 875-2: Display of the surface moisture
distribution via manual entry of the dewpoint
Compensation for
manual
reflected temperature
Setting emissivity 0.01 - 1.00
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)
Lens
Characteristic Values
Standard lens 32° x 23°
Telephoto lens (testo
9° x 7°
872-2 optional)
Aperture 1.0
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3 Specifications
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)
Power supply
Yes, with power supply 0554 8808
operation
Power supply output
5 V/4 A
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
Enclosure rating of
the housing
Physical features
IP54 (Interface terminals closed, battery
connected, lens mounted)
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
Protection class IP 54
Vibration max. 2 G
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3 Specifications
PC software
Characteristic Values
System
requirements
Operating system Windows XP Service
Pack 2 or Windows Vista
USB 2.0 interface
Standards, tests, warranty
Characteristic Values
EU Directive 2004/108/EC
Vibration
Warranty
IEC 60068-2-6
2 years, warranty conditions: see website
www.testo.com/warranty
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