Testo Testo 845HM Manual

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Melrose, MA 02176

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Toll Free 1-800-517-8431

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Instruction manual

Infrared measuring instrument

testo 845

Contents

General information ....................................................26

1. Safety instructions ............................................27

2. Intended purpose ..............................................28

3. Product description ..........................................29

3.1 Display and operating elements ....................................29

3.2 Interfaces ....................................................................30

3.3 Voltage supply ..............................................................30

4. Commissioning ................................................31

5. Operation ..........................................................31

5.1 Connecting probes ......................................................31

5.2 Switching on / off ........................................................32

6. Setting instrument ............................................32

6.1 Instrument configuration ..............................................32

6.2 Measurement configuration ..........................................34

6.3 Degree of emission ......................................................37

6.4 Storing measurement protocols ..................................37

6.5 Printing measurement protocols ..................................38

6.6 Printing current readings ..............................................38

6.7 Reading memory full ....................................................38

7. Programming ....................................................39

7.1 Installing software ............................................................39

7.2 Connecting testo 845 to a PC ............................................39

7.3 Setting up connection ........................................................39

7.4 Opening connection ..........................................................40

7.5 Programming testo 845 ....................................................40

7.6 Disconnecting ....................................................................41

8. Measuring ........................................................42

9. Care and maintenance ......................................45

10. Questions and answers ....................................46

11. Technical data ..................................................47

12. Accessories / spare parts ..................................48

26

General information

General information

This chapter provides important information on the use of this documentation.

This documentation contains information which must be observed in order to
ensure safe and efficient application of the product.

Read this document carefully and familiarize yourself with the operation of the
product before putting it to use. Keep this document close to hand in order to
be able to refer to it when necessary.

Symbols

Symbol Meaning Comments

Warning! Read the warning carefully and take the safety measures described!

Serious injury can occur if the safety measures are not taken.

Attention! Read the warning carefully and take the safety measures described!

Information Provides useful tips and information.

±, 1, 2 Handling objective Describes the objective reached by the following handling steps.

 Prerequisite Prerequisite must be fulfilled in order for a step to be carried out as

i, 1, 2, ... (Handling) step Carry out handling steps. Observe the order for numbered handling

Text Display text Text appears in instrument display.

Taste

- Result Describes the result of a (handling) step previously carried out.

º Cross reference Reference to further or more detailed information.

Operating key Press key.
Function key Press key.

Light injury or object damage can occur if the safety measures are
not taken.

Observe the order for numbered handling objectives

described

steps!

1. Safety instructions

27

1. Safety instructions

This chapter describes general rules which must be observed in order to
ensure safe use of the product.

Avoiding damage and injury

i Do not use the measuring instrument on or close to live components.
i Never store the instrument together with solvents, do not use dessicants.
i Infrared measurement: When measuring live components, observe the

necessary safety distance.

Product safety / Preserving warranty claim

i Use the measuring instrument only within the parameters given in the

Technical Data.

i Use the instrument only for the purpose for which it is intended. Do not use

force.

i Do not subject to electromagnetic radiation (microwaves, induction heating),

static electricity, heat or extreme temperature fluctuations.

i Do not subject handles and wires to temperatures over 70 °C if these are not

expressly approved for higher temperatures. Temperature information on
probes/sensors refers only to the measuring range of the sensors.

i Open the measuring instrument for maintenance or repair purposes only if

this is expressly described in the documentation.
Carry out only maintenance and repair work which is described in the docu­mentation. When doing so, observe the steps prescribed. For safety
reasons, use only original Testo replacement parts.

i Laser radiation! Do not look into the laser beam. Laser class 2.

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Correct disposal

i Hand in defective rechargeable batteries / empty batteries to the correct

collecting points.

i Send the product back to Testo if it is no longer to be used. We will dispose

of it ecologically.

2. Intended purpose28

2. Intended purpose

This chapter describes the areas of application for which the instrument is
intended.

Use the product only for the areas for which it was designed. In case of doubt
please consult Testo.

The testo 845 is a compact infrared thermometer for the non-contact
measurement of surface temperatures. Using connected probes, additional
measurements can be made with the testo 845.

The product may

· In areas where there is a danger of explosion.

· For diagnostic measurements in medicine.

For reasons of Patent Law, the testo 845 may not be used in Great Britain in
combination with the humidity module.

not

be used in the following areas:

3. Product description

29

3. Product description

This chapter provides an overview of the components of the product and their
functions.

3.1 Display and operating elements

Overview



Button functions

Button Functions

 Infrared sensor



 Humidity module

(standard with 0563 8451; retrofittable for 0563 8450)

 Measurement trigger
 Battery compartment
 IR diode for printer



 Display
 Slide switch



 Operating buttons



 Probe socket
 USB interface

Change configuration settings

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









Printout of values on Testo IR printer
Instrument configuration: activate adjustment

Store a measurement protocol
Measurement and instrument configuration menu: apply values and
jump to next setting menu

Switch between possible display images

Measurement and instrument configuration menu: change setting values

3. Product description30

Display

Display Functions

+ °C/°F Temperature reading IR

+ °C/°F Temperature reading contact probe

+ % Ambient humidity value in % relative humidity

+ °C/°F Ambient temperature reading

+ °Ctd Ambient dewpoint

+ °C ∆td Dewpoint distance

3.2 Interfaces

USB interface

The mains unit (accessory) for the voltage supply of the instrument can be
connected via the USB interface on the underside of the instrument.

Measurement / instrument data can be exchanged with a PC via the
USB interface. The measuring instrument is a HighPower instrument, an addi­tional USB-hub may be necessary!

Probe socket(s)

Plug-in thermocouple probes type K can be connected via the probe socket on
the underside of the instrument.

3.3 Voltage supply

The voltage supply is provided by two mignon batteries (included in delivery) or
rechargeable batteries or via a USB mains unit (accessories). Rechargeable
batteries cannot be charged in the instrument.

4. Commissioning

31

4. Commissioning

This chapter describes the handling steps necessary for commissioning the
instrument.

Batteries/rechargeable bbatteries

²

1 Open the battery compartment cover in the handle.
2 Fit batteries / rechargeable batteries (2 x Mignon) into the battery

compartment. Observe polarity!

3 Close the battery compartment cover.

5. Operation

This chapter describes the handling steps which are carried out often when
using the instrument

5.1 Connecting probes

Plug-in probes

Plug-in probes must be connected before switching on the measuring
instrument in order for them to be recognized by the instrument.

i Insert the connection plug of the probe into the probe socket of the

instrument.

Connecting humidity module 0636 9784

Placeholder sensoranbau

i Open the cover carefully using a suitable tool.
i Remove the cover from the connection plug.
i Connect the humidity module to the plug and

push into the housing.

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5. Operation32

5.2 Switching on / off

Switching iinstrument oon:

²

i Press measurement trigger and hold down

- The measurement display is opened: The current measurement value
and the min. / max. values are displayed

Switching iinstrument ooff:

²

i The instrument switches off automatically after 10 s if no button is

pressed.

6. Setting instrument

This chapter describes the handling steps required to adapt the measuring
instrument for special measurement tasks.

6.1 Instrument configuration

The basic settings for the measuring instrument are carried out in the configu­ration menu.

The configuration mode can be exited at any time. To do this, press .
Instrument switches to measurement display. Changes already applied
with in the configuration mode are saved.

Opening cconfiguration mmode:

1

 The instrument is switched on and is in measurement display.
i Hold down measurement trigger and briefly press : °C is displayed.

- The instrument is now in configuration mode.

Setting ttemperature:

2

 The configuration mode is open, °C is displayed.

i Set °C/°F with / °C/°F and confirm with .

The setting is applied with and the instrument jumps to the next func­tion.

º Continue with handling objective SETTING DISPLAY ILLUMINATION.