Operating Instructions MAVO-SPOT 2 Digital Luminance Meter with 1° Measuring Angle 15365 1/12-07
Table of Contents 1 Applications 2 2.1 2.2 Display Panel and Keys The Display Panel and its Elements The Keypad 5 6 3 3.1 Working with the MAVO-SPOT 2 Preparation Replacing the Batteries Self-Test Battery Indicator The Protective Filter Changing Default Settings (DIP) Unit of Measure, cd/m² or fL Modes: Standard and Compact Memory Display: Individual or Groups 6 6 7 7 7 8 8 8 9 3.2 4 4.1 4.1.1 4.2 4.2.1 4.3 4.3.1 4.3.2 4.3.3 4.
1 Applications The MAVO-SPOT 2 is a high-precision measuring instrument with a measuring angle of 1°. Luminance measurements at distances of 1 meter to infinity can be performed with the instrument. The MAVO-SPOT 2 features mirror reflex optics with a 15° field of view, a sharply marked 1° measuring circle at the center and a focusing mechanism. The close-up lenses available as accessories make it possible to shorten measuring distance to 34 cm.
Lens with protective filter or close-up lens and baffle Focus ring USB connector Eyepiece with cup Control panel Battery compartment Tripod socket Photo of MAVO-SPOT 2 4 Gossen Foto- und Lichtmesstechnik GmbH
2 The Display Panel 2.
2.2 The Keypad Measuring key Function key (Lumi – Corr – Mem) Measuring key Function / shift key (A/B – %A – A-B) Multifunction key (MFK) 3 Working with the MAVO-SPOT 2 3.1 Preparation 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 -).
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.
3.2 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.
Linear - Page DIP switch – selection of 1000 individual memory locations or subdivision into groups (see also section 3.5.2 on page 19) 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. 4 Operation 4.
4.2 Measurements key to select the Lumi function. Press the 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. . 4.2.
4.3 Reference Quantity Measurement You can compare two measured values with your MAVO-SPOT 2. key in order to select the Lumi function to this end. Press the • Acquire measured value A as described in section 4.2; measured value A is used as a reference value for the following functions. key in order to select the A/B, %A or A-B function. • Press the • Now align the measuring circle to the second point. key; the calculated value for the respective function appears at the upper part of the display.
4.3.1 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.
4.3.2 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.
4.3.3 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.
• 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 reflection standard (optional accessory). Estimations made with reflection or gloss panels are thus eliminated. key in order to ascertain The reference value is measured against the reflection standard by pressing the reflectivity.
4.4 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 reflection standard, optional accessory). key to select the Corr function. Press the • Select the desired correction factor with the MFK (visible at the top of the display).
• • • With the Corr2 function (factor of 3.142) and the GOSSEN reflection standard (optional accessory), you can indirectly measure illuminance (lux or footcandles) with your MAVO-SPOT 2. The unit of measure is switched to illuminance (lx or fc) at the display while measurement is being performed. The factor 3.
• Save Corr changes permanently Clear Memory first !! !!!! • Take readings with applied corr factors • Reset correction values to factory defaults by simultaneously pressing the 18 and Gossen Foto- und Lichtmesstechnik GmbH keys.
4.5 Memory Function In addition to its display memory, the MAVO-SPOT 2 is also equipped with a measured value memory with 1000 memory locations. This function allows you to perform measurements on-site, and to read them out at a later point in time. Stored values are retained when the instrument is switched off, as well as when the batteries are replaced. 4.5.1 Saving Measured Values (basic function) key to select the Mem function. Press the • Perform measurement as described in section 4.2. key.
4.5.2 Editing Measured Values (Mem-Edit) Stored measured values can be overwritten with the Mem function. • Select the memory location to be edited with the MFK. key in order to freeze the memory location. • Press the “Edit” and the selected memory location is shown in the display indicating that you are up to overwrite the current mem-cell • Acquire the new measured value as described in section 4.2. key.
4.5.3 Saving Measured Values with Correction Factor If a correction factor has been programmed into the MAVO-SPOT 2 (see also page 17), a corresponding display appears automatically. You can now switch back and key. Corr2 (a factor of 3.142) is forth between Corr1 and Corr2 by pressing the permanently programmed into the instrument – you can switch to illumination measurement with the GOSSEN reflection standard (optional accessory) at any time key. by pressing the 4.5.
4.5.6 Saving Measured Values (in groups) Measured values can also be saved to 10 groups of 100 measuring locations each. This function is accessed by setting the “Linear - Page” DIP switch in the battery compartment to “Page” (see page 9, Linear - Page DIP switch). key to select the Mem function. The last used group appears at the display. Press the and keys. • Group selection can be accessed by simultaneously pressing the • The last used memory group and the designations SEL und PAGE appear at the display.
5 Additional Applications 5.1 Contact Measurement with attachment (optional accessory) The MAVO-SPOT 2 can be placed directly onto a monitor screen or display surface with the attachment for contact measurements. For measurements on flat screens we recommend using the contact measurement adapter as well. Pressure applied to sensitive surfaces is significantly reduced thanks to the large surface area provided by the disc. The danger of damage during measurement is thus considerable reduced. 5.
7 7.1 • • • • • • Accessories Included with the Instrument Aluminum case Batteries Operating Instructions Protective Filter CD ROM Protective lens cap, protective eyepiece cap 7.2 Optional Accessories • Close-up lenses: Test points at distances ranging from 1 meter to infinity can be measured with the MAVOSPOT 2 and the included protective filter. Two different close-up lenses are available for shorter distances. • Close-up lens 1 (order no. M496G): reduces measuring distance to a range of approx.
7.3 Factory Certificate Factory certificate upon request (order no. H997B). The traceability of measurement results to the national standard maintained by the PTB (German Federal Institute of Physics and Metrology) is assured by means of the Wi 41G standard lamp. Depending upon how the instrument is used, we recommend a calibration interval of either 12 or 24 months. Please contact our calibration service for further details (phone: +49-911-8602-172).
9 Technical Data Type Luminance meter with SLR optic and viewfinder display for measuring light-source and surface brightness Measuring angle 1° Classification Class B per DIN 5032, part 7, and DIN EN 13032, appendix B, CIE 69 Optical system 77 mm / f/1.
Measured value memory Up to 1000 individual values or 10 groups with 100 individual values each (switchable) Display Viewfinder with back-lit LCD, measured value display with 4-digit precision Controls Easy use with 4 keys and 1 slide switch, configuration with DIP switches in the battery compartment Power supply Two 1.5 V batteries (IEC LR6, AA type) service life: app.
Table 1: MAVO-SPOT 2 Characteristics and specifications Characteristics (CIE 69, DIN 5032, EN 13032)* Admissible deviation DIN 5032 class B MAVO-SPOT 2 USB V(λ) match - f1´ 6 % ≤ 3,0 % Effect from the surrounding field - f2 (u) 2% ≤1,5 % Linearity error - f3 2% ≤ 1,5 % 1 %/K ≤ 0,5 %/K 2% ≤ 0,8 % Temperature coefficient - α0, α25 Polarization - f8 * 28 CIE 69 Methods of characterizing illuminance meters and luminance meters: Performance, characteristics and specifications DIN 5032-7
EG - KONFORMITÄTSERKLÄRUNG - DECLARATION OF CONFORMITY Dokument-Nr./ Document.No.: Hersteller/ Manufacturer: Anschrift / Address: 107/2007 GOSSEN Foto- und Lichtmesstechnik GmbH Lina-Ammon-Str.
Gossen Foto- und Lichtmesstechnik GmbH
GOSSEN Foto- und Lichtmesstechnik GmbH is also a leading manufacturer of other interesting light measuring instruments: - MAVOLUX 5032 C USB: precision digital instrument for illuminance measurement, class C in accordance with DIN 5032, part 7, and CIE no. 69. Luxmeter for use in industry and the commercial trades, as well as by government authorities, for preliminary measurements.
Printed in Germany • Subject to change without notice GOSSEN Foto- und Lichtmesstechnik GmbH Lina-Ammon-Str.22 D-90471 Nuremberg, Germany Phone: 0911-8602-181 Fax: 0911-8602-142 e-mail: info@gossen-photo.
