Gossen MetraWatt MAVOLUX 5032C Bedienungsanleitung

MAVOLUX 5032C

Digital Luxmeter 3-349-038-15

1/5.99

Operating Instructions

2GOSSEN-METRAWATT GMBH

Sensor

Luminance Attachment

Keypad

MAVOLUX 5032C

Display

Light Detector

CALCULATOR

GOSSEN-METRAWATT GMBH 3

Table of Contents Page

1 Applications ..............................................................3

2 Operation ..................................................................4

2.1 Battery Test ................................................................4

2.2 Taking Measurements .................................................4

2.3 Special Functions ........................................................ 4

2.4 Overload Display .........................................................5

2.5 Switching the Measuring Instrument Off ....................... 5

2.6 Measuring Luminance (accessory required) .................. 5

2.7 Tips for Taking Correct Measurements .........................5

2.8 Ever-Ready Case ........................................................6

3 Accessories ..............................................................6

4 Technical Data ..........................................................7

5 Maintenance and Calibration ....................................8

6 Illumination Regulations ........................................... 9

7 For Lighting and Illumination Technicians ..............10

8 Fundamental Light Theory ......................................12

9V(λ) Matching ........................................................12

10 Product Support ..................................................... 13

11 Repair, Replacement Parts and

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

1 Applications

The MAVOLUX 5032C luxmeter and Footcandle

meter is a handy, easy to use and highly accurate

measuring instrument. It allows for the measure-

ment of illumination in either lux or footcandles as

well as luminance in cd per square meter with

optional luminance attachments which can be

screwed onto the sensor, and are available as

accessories.

The instrument is equipped with color correction,

i.e. its spectral response has been matched to that

of the human eye, V(λ), in accordance with

DIN 5032, part 7, class C.

The correction filter is integrated into the sensor. All

important light characteristics can thus be accu-

rately measured without taking correction factors

into consideration.

Integrated cosine correction is included as well in

order to assure that oblique, incident light is also

evaluated correctly.

Even very intense light (e.g. daylight or headlights)

can be measured without additional accessories.

4GOSSEN-METRAWATT GMBH

2Operation

First install the included battery (one 1.5 V mignon,

alkaline-manganese cell per IEC LR6) into the bat-

tery holder. Open the snap-fastener at the battery

compartment at the back panel of the measuring

instrument. Be certain that the battery is correctly

poled when inserted according to the poling indica-

tion in the battery compartment.

2.1 Battery Test

Battery testing is performed automatically. If the “”

symbol appears at the display, the battery must be

replaced.

2.2 Taking Measurements

Switch the measuring instrument on by pressing the

“on/off” key.

After the instrument has been switched on, auto-

matic measuring range selection is always active.

The currently selected measuring range can be

locked by briefly pressing the „Auto ↕“ or the

„Range“ key (range hold). Browsing up or down

through additional measuring ranges is accom-

plished by briefly pressing the scroll keys in a

repeated fashion. If both the „Auto ↕“ and the

„Range“ keys are pressed and held simultaneously,

the instrument is returned from manual to automatic

measuring range selection.

2.3 Special Functions

After the MAVOLUX 5032C has been switched on,

the “auto-mode” is always active, i.e. the measuring

range with the best resolution is selected automati-

cally, and the display is refreshed at a frequency

which is equal to the measuring rate of the A-D

converter (approx. 2.5 measurements per second).

Hold Key

When the hold key is activated, the current mea-

surement value is frozen at the display.

The hold function is cancelled if the key is activated

a second time.

MAX Key

Maximum illumination or luminance can be deter-

mined by activating the MAX function, after which

the highest detected value is stored to memory.

The MAX function is cancelled if the key is activated

a second time.

lx/fc Key

The “lx/fc” is used to select the desired unit of

measure, either lux or footcandles. When one of the

luminance attachments is screwed to the sensor

(see chapter 3, page 6), the instrument will automat-

ically switch over to reading the corresponding units

of cd/m2.

GOSSEN-METRAWATT GMBH 5

Combining Special Functions

The hold and MAX functions are mutually incompati-

ble. If one is selected, the other is automatically dis-

abled. If a measurement value has been obtained with

the hold or the MAX function, it cannot be converted

into the other unit of measure by activating the “lx/fc”

key. The hold or MAX function is exited in such cases.

2.4 Overload Display

If a measuring range is exceeded, “OL.” (overload)

appears at the display.

2.5 Switching the Measuring Instrument Off

Switch the measuringinstrument off by pressing the

“on/off” key. The instrument is switched off automat-

ically if none of its keys are activated for a period of

approximately 2 minutes.

2.6 Measuring Luminance (accessory required)

Illumination defines the amount of light which strikes

a surface, and luminance is a measure of the

amount of light reflected from a surface.

When the luminance attachment has been screwed

onto the sensor, the measuring instrument is auto-

matically switched to the luminance mode and indi-

cates the measurement value with the correct

numeric value at the display (you do not have to

convert the value as is the case with older measur-

ing instruments!).

2.7 Tips for Taking Correct Measurements

Make sure that the illuminated surface is lit up in a

complete and uniform fashion (e.g. no shadows

cast by hand or body). Hold the sensor parallel to

the surface to be evaluated, if illumination of the sur-

face is to be measured (e.g. workstation lighting).

Please observe the following:

– Artificial sources of light do not reach full power

until after they have been on for a lengthy period

of time, and should therefore be switched on

15 minutes before measurements are taken.

– Mains voltage influences the intensity of light

generated by artificial light sources.

Check the mains voltage with a voltmeter. We

recommend the handy METRAVOLT10D from

GOSSEN-METRAWATT GMBH.

6GOSSEN-METRAWATT GMBH

2.8 Ever-Ready Case

A leather ever-ready case for the luxmeter and a

leather quill for the sensor are included as standard

equipment. A clip is provided at the rear for attach-

ing the instrument to a belt.

A window in the ever-ready case, as well as an

opening for the sensor in the quill, allow for outdoor

use even under inclement weather conditions.

The leather quills for the sensor and the luminance

attachment (accessory) can be fastened to the ever-

ready case with Velcro strips at the right and left.

When storing the equipment, please place the sen-

sor in the quill with the measuring aperture turned

away from the opening. So the light sensitive sur-

face will be protected.

3 Accessories

Separately available accessories expand the

applications range of the instrument.

Calculator for the camera man

and the professional photographer

The measuring results from any luxmeter can be

selected at this exposure calculating disc with a

diameter of approximately 110 mm, and the corre-

sponding exposure time / aperture combinations

can be viewed. Values can be read from the calcu-

lating disc in the following units of measure: lux (lx)

and footcandles (fc), or candela per square meter

(cd/m²) and footlamberts (fL).

Luminance Attachment

The luminance attachment measures reflected light,

i.e. the luminance of a surface, with a measuring

angle of ±10°.

The measuring instrument is informed by a touch-

sensitive switch as to whether or not the luminance

attachment has been attached and which one.

The luminance measurement value is indicated at

the display with the correct numeric value and unit

of measure (see also chapter 2.6, page 5).

GOSSEN-METRAWATT GMBH 7

4 Technical Data

Light Detector silicon photodiode with V(λ) filter per DIN 5032/7, class C

Error Limits per DIN 5032, part 7, class C

Most Important Error Limits Measuring Rate approx. 2.5 measurements per

second

LCD Field 50 mm x 25 mm

Display 7 segment

Char. Height 13 mm

Digits 3½ places

Overload Display “OL.” is displayed

Measured Quantity Measuring Range Resolution

in lx Resolution

in fc

in Lux (lx) in footcandles (fc)

Illumination I0.1…199,9 0.01 …19,99 0.1 0.01

II 1…1 999 0.1 …199,9 1 0.1

III 10…19 990 1 …1 999 10 1

I V 100 … 199 900 10 …19990 100 10

in Candela/m² in cd/m²

Luminance

(with luminance at-

tachment for cd/m2)

I1…1 999 1

I I 10 …19 990 10

III 100…199 900 100

I V 1000 …1 999 000 1000

Characteristics Allowable Error

Limits per

DIN 5032 Class C

Actual Error,

MAVOLUX 5032C

V(λ) Matching 9% 7.5%

True Cosine Evaluation 6% 2%

Linearity 5% 1.5%

Adjustment Error 2% 1%

Total Error 20% 15%

8GOSSEN-METRAWATT GMBH

Power Supply

Battery 1.5 V mignon alkaline-

manganese cell per IEC LR 6

Service Life approx. 75 hours continuous

operation, equivalent to

approx. 2500 measurements

Battery Test Automatic display of “ ”

symbol when battery voltage

drops to below approx. 1.0 V

Electromagnetic Compatibility (EMC)

Interf. Emission EN 50081-1: 1992

Interf. Immunity EN 50082-1: 1992

Mechanical Design

Housing Plastic

Dimensions Meter: 65 x 120 x 19 mm

(without ever-ready case)

Sensor: 31 x 105 x 30 mm

Weight Meter and sensor:

approx. 200 gr. w/o battery

Light Detector Light collector surface

at diffuser: approx.20 mmdia.

Cable from Meter

to Sensor Permanently attached coil cord

Cable Length approx. 1.5 m

Technical Data, Accessories

Luminance Attachment (meas. angle ε1/10 = 20° )

5 Maintenance and Calibration

No special maintenance is required if the instrument

is handled correctly. Keep outside surfaces clean.

Use a slightly dampened cloth for cleaning. Avoid

the use of cleansers, abrasives or solvents.

Should the instrument nevertheless not work to your

complete satisfaction, please send it to our Service

Division who will speedily carry thorough the neces-

sary repairs. The equipment will be calibrated while

using a standard light source of 2856 K correspond-

ing to the PTB Standard Specifications.

Recalibration Schedule

We recommend re-calibration every 1 to 3 years

depending upon how theinstrument is used.Please

contact our calibration service, whose address is

included on page 13.

GOSSEN-METRAWATT GMBH 9

6 Illumination Regulations

The following definitions are included in part 1 of the

DIN 5035 standard under the heading “Terms and

General Requirements”:

Nominal Illumination

Nominal illumination values for indoor areas include

20/50/100/200/300/500/750/1000/1500 and

2000 lx.

The nominal illumination value is related to the mean

aging factor of the lighting system in question.

The nominal illumination value which is assigned to

a specific type of room or activity is related to the

difficulty of the respective visual task. The assump-

tion is made that the nominal illumination value and

its influence on ones ability to see are not impaired

by interference effects suchas direct glare, reflected

glare and loss of contrast, as well as unsuitable

color and color rendition.

The assignment of a specific nominal illumination

value to a visual task is based upon persons with

average sight. A sight defect which has not been

fully corrected with glasses etc., can be partially or

fully compensated for by increasing illumination.

Illumination at the Workplace

Nominal illumination of at least 200 lx is required for

continuously occupied indoor workstations, unless

another value is required due to operational or

optical, physiological reasons.

In rooms or indoor areas which are continuously

occupied by personnel, nominal illumination of at

least 100 lx is required.

Planning Values and Minimum Values

The nominal illumination value should be multiplied

by a factor of 1.25 for planning purposes.

The mean, arithmetic illumination value at the work-

place may not have a value of 0.8 times less than

the nominal illumination value, independent of the

aging factor of the lighting system. However, illumi-

nation at any given workstation may never have a

value of less than 0.6 times the nominal illumination

value.

10 GOSSEN-METRAWATT GMBH

DIN 5035 Part 2, Illumination with Artificial Light

Under the heading “Recommended Values for

Indoor and Outdoor Work Areas”

This standard includes an extensive table which

classifies types of work areas and activities, illumina-

tion values, the color of the light, characteristic color

rendition levels and classifications for the limitation

of direct glare. Important notes concerning special

requirements for lighting systems are included in an

additional column, for example, under which cir-

cumstances additional illumination at any single

workstation would be recommended, or even

required.

A table with recommended values for outdoor work

areas has also been added since the version issued

in October, 1979. In addition, characteristic color

rendition levels have been updated to correspond to

the classifications set forth in DIN 5035 part 1.

7 For Lighting and Illumination Technicians

The measurement of illumination is required for the

planning, and during the installation of lighting sys-

tems for which testing and monitoring is required by

law, as well as for the definition of illumination values

for hygienic, physiological, psychological or safety

reasons.

Scope of applicability, terminology, responsibility,

requirements and practical guidelines have been set

forth to a great extent in various DIN standards.

Definitions:

General Lighting

Uniform lighting within a room which provides for

roughly equal seeing conditions at all points within

the room.

Workplace Oriented General Lighting

General lighting with specified relationships between

lamps and specific workstations (see

DIN V ENV 26385 for definition of workplace).

Individual Workstation Illumination

Illumination for a single workstation in addition to

general lighting.

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