Gossen MetraWatt MAVO-MONITOR Bedienungsanleitung

MAVO-MONITOR / MAVO-SPOT

Instrument Set for Contact or Distant Measurements of Luminances 15043

1/1.00

Operating Instructions

2GOSSEN Foto- und Lichtmeßtechnik

1 Display

2Slider switch cd/m² – segment test

3 ON/OFF switch

4 Rechargeable battery socket

5 Socket for recorder output

6 Hold key

7 Selector slider switch

8 Socket for connection to meas. sensor

9 Measuring sensor

10 Sensor aperture

Contents Page

1 Description of MAVO-MONITOR .............3

2 Applications ..............................................3

3 Operating the MAVO-MONITOR ..............4

3.1 Inserting the Battery ........................................4

3.2 Preparing the Measurement ............................4

3.3 Contact Measurements ...................................5

3.4 Overflow ..........................................................5

4 Functioning and Circuitry ........................6

5 What is Luminance? ................................6

6 Technical Data ..........................................7

7 Maintenance ..............................................8

7.1 Calibration Service ..........................................8

7.2 Cleaning and Maintenance ..............................8

8 Description of MAVO-SPOT .....................9

9 Operating the MAVO-SPOT ...................10

9.1 Inserting the Battery ......................................10

9.2 Battery Control ...............................................11

9.3 Preparing the Measurement ..........................11

9.4 Measuring ......................................................11

10 Technical Data ........................................12

11 Maintenance ............................................13

11.1 Calibration Service ........................................13

11.2 Cleaning and Maintenance ............................13

GOSSEN Foto- und Lichtmeßtechnik 3

1 Description of MAVO-MONITOR

The MAVO-MONITOR is an illumination level

meter designed for easy and precise measure-

ments in cd/m² on backlighted or luminous sur-

faces. 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 sen-

sor. They can thus measure all salient kinds of

light without having to take correction factors into

account.

The recorder output of the MAVO-MONITOR

makes it particularly suitable for monitoring appli-

cations, checking technical acceptance conditions

and wherever hardcopy results are required.

2 Applications

Contact Measurements

with the MAVO-MONITOR

placed directly on the surface to be measured.

Suitable for

• monitors

• television screens

• light boxes

• light displays

Measuring at a Distance

Using the MAVO-MONITOR plus

MAVO-SPOT attachment.

Suitable for measuring

• monitors taking the existing ambient light

into consideration

• lighting of streets and airfield areas

• lighting of sports areas

• light contrasts at work stations

• lighting in museums

• uniform illumination of projection screens

4GOSSEN Foto- und Lichtmeßtechnik

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 com-

partment.

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!

3.2 Preparing the Measurement

Connect the measuring sensor to the

MAVO-MONITOR. Switch the instrument on using

the ON/OFF switch and carry out a segment test.

Segment test

Move the slider switch to the position

“Segm.-Test”. The display is working properly

when the readout 1888 appears for 1.5 seconds

(followed by an undefined readout).

If not, the instrument must be returned to our

Service Department.

GOSSEN Foto- und Lichtmeßtechnik 5

3.3 Contact Measurements

Move the slider switch to “cd/m²”.

Place the sensor flat on the surface to be meas-

ured. Select the desired measuring range using

the selector slider switch.

Notes

– Strong ambient light can influence the measure-

ment. 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 lumi-

nance until they have warmed up. It is therefore

advisable to switch on 15 min. earlier.

– The luminance of light sources depends on the

power supply i.e. check the voltage with a volt-

meter where necessary.

3.4 Overflow

If the measuring range is exceeded

the display merely shows a 1 on

the left, the other digits will be

blank. Move to the next higher

range.

Display Hold

Pressing the display hold button will “freeze” the

readout at that time. Pressing this button again will

release the hold and normal measurements can

be resumed.

6GOSSEN Foto- und Lichtmeßtechnik

4 Functioning and Circuitry

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 advan-

tage of low dependency on temperature and pro-

ducing a linear result. Range selection is done by

means of the selector slider switch. Sensors can

be interchanged by means of the “sensor match-

ing” circuit in conjunction with the potentiometer

control in the sensor. This circuit also generates

the voltage level for the recorder output.

5 What is Luminance?

This is the amount of light as registered by the

eye. Luminance thus expresses the brightness of

a surface. The luminance in a certain direction is

the density of the illumination emitted from the

light-source surface, i.e. the quotient of the illumi-

nance J in the direction concerned and the illumi-

nating surface area A • cos ε.

The unit of measurement of luminance is the can-

dela per square centimeter = cd/cm²

or for very low luminance levels cd/m² (the former

unit was: “Apostilb” (1 asb = 0.31831 cd/m²)).

Also used:

1 fL (footlambert) = 3.426 cd/m²

1 cd/ft² (candela per square foot) = 10.76 cd/m²

A • cos ε

Probe

(7)

cd/m² Segment test

Probe

Adaptor

Power Supply

Battery Monitoring

Segment test

Analogue

Digital

Converter

Batt.

Recorder Output Store

GOSSEN Foto- und Lichtmeßtechnik 7

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 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.

Recorder

Output 0 ... 1.00 V for each range.

Necessary input impedance

of recorder at least ≥500 kΩ.

The recorder output socket

complies with safety class III

requirements.

Meas. Sensor

– Aperture

– Meas. Area 18.5 mm ∅

10 x 10 mm

Display LCD 3½digits

Digit Height 12.7 mm

Power Supply 9 V IEC 6 F 22 battery

(e.g. Mallory MN 1604/Alkali

or Varta Super 438)

Accu IEC 6 LF 22

(e.g. Varta 4002)

Case Plastic

Cable Length 1.5 m

Dimensions

– Meas.

Instrument 86 x 153 x 25 mm

– Meas. Sensor 32 x 105 x 95 mm

– Ever-Ready

Case approx. 140 x 200 x 40 mm

Weight approx. 350 g without batteries

Included

Accessories Ever-ready case

Optional Accessories

MAVO-SPOT attachment

for measuring at a distance

8GOSSEN Foto- und Lichtmeßtechnik

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. Avoid exposing the sensor to unnecessary

light.

Please use a slightly damp cloth only for cleaning

the plastic surfaces; avoid the use of cleaning

agents or other strong chemicals. The lenses

should be cleaned with a special cloth or brushes

as used for optics.

GOSSEN Foto- und Lichtmeßtechnik 9

1 ON/OFF switch

2 Battery control

3 Lens with protective filter or close-up lenses

4 Ocular with eye-cup

5 Battery compartment

6 Connection cable

8 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. the

spectral response of the photo diode is adapted to

that of the human eye V (λ) according to

DIN 5032/T7 class B.

Measuring at a Distance

Using the MAVO-MONITOR plus

MAVO-SPOT attachment.

Suitable for measuring

• monitors taking the existing ambient light

into consideration

• lighting of streets and airfield areas

• lighting of sports areas

• light contrasts at work stations

• lighting in museums

• uniform illumination of projection screens

10 GOSSEN Foto- und Lichtmeßtechnik

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.

Attention

Only use new batteries or rechargeable accus

according to IEC 6 LF 22!

Andere Handbücher für MAVO-MONITOR

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