Operating Instructions MAVO-MONITOR / MAVO-SPOT Instrument Set for Contact or Distant Measurements of Luminances 15043 1/1.
Contents 10 8 1 2 3 Description of MAVO-MONITOR ............. 3 Applications .............................................. 3 Operating the MAVO-MONITOR .............. 4 1 3.1 3.2 3.3 3.4 Inserting the Battery ........................................4 Preparing the Measurement ............................4 Contact Measurements ...................................5 Overflow ..........................................................5 4 5 6 7 Functioning and Circuitry ........................
1 Description of MAVO-MONITOR The MAVO-MONITOR is an illumination level meter designed for easy and precise measurements in cd/m² on backlighted or luminous surfaces. The instrument is colour-corrected, i.e. the spectral response of the photo diode is adapted to that of the human eye V (λ). The correction filters are incorporated in the sensor. They can thus measure all salient kinds of light without having to take correction factors into account.
3 Operating the MAVO-MONITOR 3.1 Inserting the Battery The battery compartment is to be found at the back of the unit. To open the compartment turn the screw through 90° using a coin so that the lid pops open. Insert the included battery into the battery compartment. Make sure you insert the batteries with the right polarity. Close the battery compartment. Attention Only use new batteries or rechargeable accus according to IEC 6 LF 22! 4 3.
3.3 Contact Measurements Move the slider switch to “cd/m²”. Place the sensor flat on the surface to be measured. Select the desired measuring range using the selector slider switch. Notes – Strong ambient light can influence the measurement. This is particularly important when a glass pane is sandwiched between the actual screen surface and the sensor. – Artificial light sources do not achieve full luminance until they have warmed up. It is therefore advisable to switch on 15 min. earlier.
4 Functioning and Circuitry 5 The instrument essentially comprises the sensor containing the silicon photocell and the correction filters and the instrument itself. In an integrated (IC) operational amplifier the short-circuit current of the photocell, which is located directly at the input to the op amp, is measured. This kind of short-circuit current measurement has the advantage of low dependency on temperature and producing a linear result.
6 Technical Data Meas. Ranges / Resolution 0.01...19.99 cd/m² ( 10 mcd/m²) 0.1...199.9 cd/m² (100 mcd/m²) 1...1999 cd/m² ( 1 cd/m²) 0.01...19.99 kcd/m²( 10 cd/m²) Accuracy Recorder Output Meas. Sensor – Aperture – Meas. Area Display Digit Height for incandescent bulb light (normal light A) ± (2.5% of rdg. + 4 digits) Additional error for other light sources (acc. to CIE TC - 2.2): max. ± 3% of rdg. 0 ... 1.00 V for each range. Necessary input impedance of recorder at least ≥ 500 kΩ.
7 Maintenance 7.1 Calibration Service The instruments are calibrated at the light of a scientific standard lamp having a colour temperature of 2856 K, fully in accordance with the PTB standard. Depending on how the instrument is being used we recommend a recalibration interval between 12 and 18 months. For this purpose please contact our Calibration Service Department (telephone +49 911 8602 172). 7.2 Cleaning and Maintenance Keep the instrument dry and clean, away from dust.
8 3 4 1 Description of MAVO-SPOT The MAVO-SPOT is a very precise measuring instrument attached to the basic instrument MAVO-MONITOR with a measuring angle of 1°. This combined equipment set permits measuring the luminance at distances from 1 m to ∞ while including the existing ambient light. That distance can be further reduced down to 34 cm when using the close-up lenses which are available as optional accessories. The MAVO-SPOT is colour-corrected, i.e.
9 Operating the MAVO-SPOT 9.1 Inserting the Battery The battery compartment is located at the front of the grip of the unit. Slide the cover of the compartment downwards, insert the battery and attach the connector clips to the new battery. Take care to get the polarity right. Close the battery compartment.
9.2 Battery Control When the instrument is switched on the green LED on the right of the ON/OFF switch lights up. When the battery is exhausted the red LED to the left of the ON/OFF switch will light up. You should then immediately replace the battery. A new alkaline-manganese battery will last for approx. 60 hours of continuous measuring. 9.3 Preparing the Measurement Screw the protective filter supplied with the instrument or one of the close-up lenses on the ocular of the MAVO-SPOT.
10 Technical Data Light Sensor silicon photodiode with V(λ) adaptation approx. 4% acc. to DIN 5032/T7 class B Meas. Angle 1° Meas. Range 0.01 cd/m² to 20.000 cd/m² in 4 ranges Meas. Accuracy same as MAVO-MONITOR Power Supply 9 V IEC 6 F 22 battery (e.g. Mallory MN 1604/Alkali or Varta Super 438) Accu IEC 6 LF (e.g. Varta 4002) Operating Duration approx.
Close-up Lenses The MAVO-SPOT with the included protective filter attached to the lens permits measuring from a distance of 1 m to ∞. For shorter distances two different close-up lenses are available as optional accessories. The closeup lens 1 reduces the measuring distance to approx. 51 cm to 1 m. Lens no. 2 permits reducing the measuring distance to approx. 34 to 51 cm. Please note that one of the close-up lenses or the protective filter must be mounted to the lens.
GOSSEN Foto- und Lichtmeßtechnik
GOSSEN Foto- und Lichtmeßtechnik 15
Printed in Germany • Subject to change without notice GOSSEN Foto- und Lichtmeßtechnik GmbH Lina-Ammon-Str. 22 90471 Nürnberg, Germany Telephone:+49 911 / 8602-181 Telefax: +49 911 / 8602-142 http://www.gossen-photo.
