Gossen MetraWatt MAVO-SPOT 2 USB User manual

Operating Instructions
MAVO-SPOT 2 USB 15365
Digital Luminance Meter with 1° Measuring Angle 3/04.19

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Thank you for buying the precise MAVO-SPOT 2 USB from GOSSEN. Your new luminance meter guarantees the reliable
measurement of daylight and artificial sources of light including LED.
The high precision luminance meter for distance measurement with an acceptance angle of 1° is assigned to class B in
accordance with DIN 5032-7, appendix B of DIN EN 13032-1 and CIE 69. It measures the perceived brightness of back-
lighted surfaces in candelas per square meter (cd/m²) or foot-lambert (fL) in consideration of ambient light.
The meter is equipped with an excellent adaptation to the spectral brightness sensitivity of the human eye V(λ) and is
highly precise with a minimal deviation of just f1‘ < 3 %, which is significantly better than specified in the standard. By
means of the mirror reflex optics, the measuring subject may be targeted precisely in a 15° field of view and a sharply
marked 1° measuring circle in the center of the viewfinder. Focus can be set for distances ranging from 1 meter to infinity.
Shorter distances as of 34 cm are made possible by means of optional close-up lenses. Alternatively, contact measure-
ment can also be performed with an optional, top quality probe. The velvety coating on the adapter disc prevents
scratching of self-luminous and back-lighted surfaces.
The comparative and ratio measurements are especially advantageous, by means of which deviation of measured value
B from reference value A is evaluated and displayed. The relationship A/B is used for contrast measurement at work-
stations. Percentage deviation %A allows for an assessment of the consistency of monitor screens and projection screen
lighting, and difference A-B is used to detect deviation during the production process.
The meter’s continuous operating mode is assured thanks to power supply via the USB port. Meter control, as well as
acquisition, display and storage of measured values, is managed with the free GLUX 2 software which can be
downloaded from the GOSSEN website.
Do not perform measurements with the instrument pointed towards sun.
Eye damage may result, and the light sensor could be damaged as well.

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Table of Contents Page
1 Initial Startup 8
1.1 Inserting the Batteries 8
Self-Test 8
Battery Indicator 8
1.2 Lens Accessories 9
1.3 Changing the Default Settings 9
Modes: Standard and Compact 9
Unit of Measure, cd/m² or fL 10
Memory Display: Individual or Groups 10
2 The Meter and its Controls 11
2.1 Device Overview 11
2.2 Display 12
2.3 Controls 13
3 Operation 13
3.1 Switching the Instrument on 13
3.1.1 Display On-Time 13
3.2 Measurements 14
3.2.1 Overflow / Underflow Display 14
3.3 Reference Quantity Measurement 15
3.3.1 Ratio A/B 16
3.3.2 Percentage Deviation %A 17
3.3.3 Difference A-B 18
3.4 Setting Correction Factors 20
Table of Contents Page
3.5 Memory Function 23
3.5.1 Saving Measured Values 23
3.5.2 Editing Measured Values 24
3.5.3 Saving Values with Corr. Factor 25
3.5.4 Reading Out Measured Values 25
3.5.5 Clearing Memory 25
3.5.6 Saving Measured Values (in groups) 26
4 Additional Applications 27
4.1 Contact Measurement 27
4.2 Near Range Measurement 27
4.3 Stationary Use 27
4.4 Illuminance Measurement 28
5 USB Port - Software 28
GLUX 2 Software 28
Interface Description 28
6 Factory Calibration 29
7 Practical Tips 29
8 Service Notes 30
9 Technical Data 31
Declaration of Conformity 34

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Safety Precautions
Please read these safety precautions carefully before using your meter. This will help you to avoid damaging the product and prevent personal injury.
This symbol identifies important warnings which should be read
in any case before initial startup of your GOSSEN product.
Warnings
In the event of malfunctioning, switch the meter off immediately.
In the event that smoke develops or unusual odors become apparent, which are caused by the meter, remove the batteries from the
device in order to prevent possible fire. Continuing to operate the meter after such malfunctions have occurred may result in severe
injury. Please contact your local dealer or GOSSEN Service in order to eliminate malfunctioning. If you bring or send the meter in for
repairs, make sure that the rechargeable battery has first been removed.
Do not use the meter in proximity to flammable gases.
Electronic devices should never be used in proximity to flammable gases. Danger of explosion and fire is otherwise immanent.
Never hang the device from children with the carrying strap.
Danger of strangulation exists if the carrying strap is hung around the neck of a child.
Store the meter at a location which cannot be accessed by children.
The meter and its accessories include parts which can be swallowed. Make sure that these parts (e.g. housing covers, batteries etc.)
do not fall into the hands of children who might swallow them. Otherwise, danger of suffocation prevails.
Use suitable cables only.
Use included, original GOSSEN cables only for connection to external devices. GOSSEN assumes no liability if other cables are used.

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Do not dismantle the meter.
Never touch any parts inside the housing. Injury may result. Do not repair the meter yourself. Repairs may only be conducted by
appropriately trained personnel. If the meter’s housing is damaged due to dropping or other external influences, remove the batteries
and contact your local dealer or GOSSEN Service for repair.
Avoid any and all contact with the liquid crystals.
If the display is damaged (e.g. broken), danger of injury due to contact with glass shards or discharge of liquid crystals exists. Make
sure that skin, eyes and mouth do not come into contact with the liquid crystals.
Be careful when handling batteries.
Batteries may leak or explode if handled incorrectly. Please adhere to the following safety precautions:
• Make sure that the meter is switched off before removing or inserting batteries.
• Only use batteries which are recommended for this meter.
• Make sure that the batteries are correctly inserted.
• Never short-circuit batteries, and never attempt to open batteries.
• Do not expose batteries to excessive heat or open fire.
• Do not expose batteries to moisture and never immerse batteries in water.
• After removing the batteries from the meter, close the battery compartment with the lid
(e.g. if the meter will not be used for a lengthy period of time).
•Never store batteries together with metallic objects which might cause short-circuiting.
• Danger of leakage exists, especially in the case of empty batteries. In order to prevent damage to the meter,
batteries should be removed when fully depleted or in the case of lengthy periods of non-use.
• When not in use, batteries should be stored in a cool place.
• Batteries heat up during use and may become hot. Be careful not to burn yourself when removing batteries.
Switch the meter off or wait until it has shut itself down, and then wait a bit longer until the batteries havecooled down.
• Do not use batteries which show any signs of damage such as discoloration or deformation of the housing.

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Other Notes
•Reproduction of product documentation or duplication of any excerpts therefrom necessitates the express consent of GOSSEN Foto- und
Lichtmesstechnik GmbH. This applies as well to duplication in any electronic format and translation into other languages.
•GOSSEN Foto- und Lichtmesstechnik GmbH reserves the right to make changes of any type without providing advanced notice.
•GOSSEN assumes no liability for damages resulting from incorrect use of the product.
•Documentation for your GOSSEN meter was prepared with the greatest of care. If you should nevertheless discover errors, or if you would
like to suggest any improvements, GOSSEN would be very pleased to hear from you.
Symbol for separate collection of recyclable materials / hazardous waste in European countries
This symbol indicates that this product must be disposed of separately.
The following must be observed by users in European countries:
• This product may only be disposed of separately at a designated collection point. It may not be disposed of with household trash.
• For further information contact your local dealer or waste disposal authorities.

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1Initial Startup
1.1 Inserting the Batteries
The battery compartment is located at the front of the grip. Push the battery compartment
cover in the grip down. Remove the battery holder with the help of the tab. Replace the
batteries assuring correct polarity (+ and -). Insert the battery holder into the instrument
and close the battery compartment with its cover. Approximately 5000 measurements
can be performed with a new set of batteries.
Attention: Use new batteries only in accordance with IEC LR6 (2 ea. 1.5 V, AA).
Self-Test
After inserting the batteries, the microcomputer executes a self-test. All of the elements
included in the display panel appear at the display during this test. The display test can be
aborted by pressing any key.
Battery Indicator
The MAVO-SPOT 2 requires two 1.5 V AA batteries (alkaline manganese). The capacity
display indicates the current battery power level. Measured values are retained in
memory when the batteries are changed.
•= The batteries are fully charged.
•= The batteries are partially discharged –be prepared to replace them.
•= The batteries are depleted and must be replaced as soon as possible.

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1.2 Lens Accessories
When using optional lens accessories, means close-up lenses or probe for contact measurement,
only a maximum of one accessory may be mounted in front of the lens. The optional accessories
for the meter are adapted to its specified accuracy. The use of accessories from other
manufacturers may lead to significant measurement deviations in the range of several percent.
1.3 Changing the Default Settings
You can change the default settings for your MAVO-SPOT 2. The settings are selected with the help
of the DIP switches inside the battery compartment underneath the battery holder. The default settings
can be changed as desired in any combination.
Stand. - Comp. DIP switch –selection of standard or compact operating mode
The operating mode can be changed from standard to compact with the Stand. - Comp. DIP switch.
You can perform measurements and save measured values in the compact mode –the calculation
and correction values functions (Corr) are disabled; programmed correction values are nevertheless
taken into account.

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cd/m² - fL DIP switch –selection of a of a unit of measure: cd/m² or fL
The desired unit of measure, namely candelas per square meter or foot-lamberts, can be selected with the
cd/m² - fL DIP switch.
Linear - Page DIP switch –selection of 1000 individual memory locations or subdivision into groups
You can select either consecutive storage of 1000 measured values or subdivision into 10 groups with 100 measured
values each with the Linear - Page DIP switch. The pages are identified as P-01 through P-10.
Memory content is deleted automatically when the memory location display mode is switched.

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2 The meter and its Controls
2.1 Device Overview
Lens with thread for
contact measuring
probe, close-up lens
and/or stray-light baffle
Focus ring
USB connector
Battery compartment
Eyepiece
with cup
Control panel
Tripod socket

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2.2 Display
1Memory location display
2Measured value and memory display
3Unit of measure
4Symbol for correction factors 1 and 2
5Difference symbol
6Ratio symbol
7Percentage deviation symbol
8Calculated value, memory group
9Plus or minus sign for calculated value
10 Low battery warning display
11 USB indicator
12 Measuring function
13 Correction factor function
14 Measured value memory function
15 Ratio function
16 Percentage deviation function
17 Difference function

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2.3 Controls
3 Operation
3.1 Switching the Instrument On
The MAVO-SPOT 2 can be switched on by pressing any key. The measuring instrument is activated
and the display panel is illuminated. The last measured values appear at the display (display memory).
3.1.1 Display On-Time
If none of the keys at the MAVO-SPOT 2 are activated for a period of 30 seconds, the instrument is switched off
automatically, i.e. the display goes blank but measured values and individual settings are stored to memory.
Measuring key
Funtion key
(Lumi - Corr - Mem)
Measuring key
Function / shift key
(A/B - %A - A-B)
Multifunction key (MFK)

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3.2 Measurements
Press the key to select the Lumi function.
Look through the eyepiece on the MAVO-SPOT 2, and sharply focus your
measuring field with the focusing mechanism at the lens. Now align the
measuring circle reflected into the viewfinder to the point to be measured. This
point should be uniformly illuminated, and as large as possible relative to the
measuring circle.
Press the key and read the measured value.
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3.2.1 Overflow / Underflow Display
If the measuring range is exceeded, “----” appears at the display.
If the measuring range is fallen short of, “0.00” appears at the display.

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3.3 Reference Quantity Measurement
You can compare two measured values with your MAVO-SPOT 2.
Press the key in order to select the Lumi function to this end.
•Acquire measured value A as described in section 3.2; measured value A is used as a reference value for the
following functions.
•Press the key in order to select the A/B, %A or A-B function.
•Now align the measuring circle to the second point.
•Press the key; the calculated value for the respective function appears at the upper part of the display.
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•After acquiring measured value B, calculated value A/B, %A or A-B can be displayed by pressing the key.

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3.3.1 Ratio A/B
This function is used, for example, for contrast measurements and luminance distribution at workstations.
•The larger of the two measured values is always used as a dividend; i.e. if measured value B is larger than measured
value A, the ratio of the two measured values is calculated as B ÷ A.

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3.3.2 Percentage Deviation %A
This function is used, for example, for testing monitor screen uniformity (percentage deviation of screen corners from the
reference value at the middle of the screen).
•Depending upon the respective results, the minus sign (-) must be observed.
etc.

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3.3.3 Difference A-B
You can read the difference between reference value A and the second measured value (B) directly from the display. This
function is used, for example, for detecting deviations in manufacturing.
•Depending upon the respective results, the minus sign (-) must be observed.
etc.

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•You can switch back and forth between measured values A and B with the MFK.
•The reflectivity of ceilings, walls and floors can be measured with the MAVO-SPOT 2 in combination with the
reflectance standard (optional accessory). Estimations made with reflection or gloss panels are thus eliminated.
•The reference value is measured against the reflectance standard by pressing the key in order to ascertain
reflectivity.
•Further measurements executed with the key indicate deviation as a percentage at the upper portion of the
display.
etc.

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3.4 Setting Correction Factors
As many as two different correction factors can be entered to the MAVO-SPOT 2.
•As default values, Corr1 is set to a factor of 1.000 (no correction) and Corr2 to a factor of 3.142 (illuminance
measurement with GOSSEN reflectance standard, optional accessory).
Press the key to select the Corr function.
•Select the desired correction factor with the MFK (visible at the top of the display).
•While setting the factor, any measured value shown in the display is correspondingly adjusted (visible at the bottom of
the display).
•You can switch back and forth between correction factors 1 and 2 with the key.