Gossen MetraWatt MAVOLUX 5032C User manual

MAVOLUX 5032C
Digital Luxmeter 3-349-038-15
1/5.99
Operating Instructions

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Sensor
Luminance Attachment
Keypad
MAVOLUX 5032C
Display
Light Detector
CALCULATOR

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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.

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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.

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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.

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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).

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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%

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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.

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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.

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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.