Gossen MetraWatt SECULIFE IT User manual

Operating Instructions
SECULIFE | IT and ITC 15507
Illuminance Tester 2/2.14

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Perspective view of SECULIFE IT
Photometer head
Circular orifice
Light collector
USB Port
Display
Key pad
Back of display unit:
- battery door
- serial number
- calibration seal for DAkkS- or
calibration certificate (if available)
Back of photometer head:
- serial number of display unit
- tripod socket ¼ “

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Contents
Page Page
1 Applications.............................................4 5 USB Port –Standard Software……..12
2 Display..................................................... 5 6 Accessories..................................... 13
2.1 Description of Display Elements.............. 5 6.1 Standard Equipment......................... 13
2.2 Key Pad................................................... 5 6.2 Optional Accessories........................ 13
6.3 Calibration Certificate........................ 14
3 Functioning of the SECULIFE.............. 6 6.4 DAkkS Certificate………………… 14
3.1 Preparation............................................. 6
3.2 Duration of Display – 7 Service and Maintenance….……. 14
Continuous Operation.............................. 6
4 SECULIFE IT Operation.......................... 7 8 Specifications................................. 14
4.1 Switch On – Make Measurement...... 7
4.2 Selecting the Measuring Unit –
lx or fc – cd/m2 or fL........................... 7 Declaration of Conformity............ 18
4.3 Overload Display – Zero Point Indication 7
4.4 Memory Functions.................................... 8
4.4.1 „HOLD“ Display Hold Function................. 8
4.4.2 „Mem“ – Save Measured Values
in Memory........................................... 9
4.4.3 „Mem Edit“ – Overwrite a Saved
Measured Value.................................10
4.4.4 „Mem Recall“ - Data Memory Recall….... 11
4.4.5 „Mem Clear“ - Clear Memory...................12

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1 Applications
The SECULIFE IT illuminance meters are handy, easy to use and high precision measuring instruments.
They allow the accurate measurement of the illuminance in the unit lx or fc.
Combined with the Luminance Attachment, available as optional accessory, the SECULIFE IT can also be
used for measuring luminance in the unit cd/m² or fL.
The light sensor is color corrected, i.e. its relative spectral responsivity has been adapted to that of the
human eye V(  ). All the important types of light can be measured with high precision, without the necessity
to apply any additional correction factors.
The accuracy of that V(  ) adaptation is the main difference between the two types SECULIFE ITC
(M688E) and SECULIFE IT (M688A). The quality classes for illuminance meters have been defined in the
Standard Specifications DIN 5032, Part 7. Consequently, the SECULIFE ITC complies with Class C,
SECULIFE IT complies with Class B (DIN 5032, part 7 and 8).
The light collector with circular orifice in the photometer head has integrated cosine correction, so that
oblique incident light will be measured accurately.
Both SECULIFE IT/ITC types allow measuring very high intensity light (daylight, headlights) without
additional accessories. Especially the SECULIFE IT having an initial sensitivity of 0.01 lx is ideally suited
for measuring extremely low light intensities, such as emergency lighting.
The instruments are provided with a measuring value memory with 100 data spaces, which can be read
and processed directly by the keys and the display but also through the integrated USB Port and the
Standard Software supplied with the meters.
lx = Lux 1 lx = 0.0929 fc
fc = footcandle 1 fc = 10,76 lx
cd/m² = Candela per square meter 1 cd/m2 = 0,2919 fL
fL = footlambert 1 fL = 3,426 cd/m2

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2 Display
2.1 Description of Display Elements 2.2 Key Pad
1 Display of measuring value and Memory 1 Switch On/Off
2 Measuring Unit 2 Range key – Memory/Measuring range
3 Display „HOLD„ indication / Buffer Storage 3 lx/fc – Select measuring unit
4 Multiplying factor for measuring value 4 HOLD – Function / Buffer Storage
5 Auto ranging – automatic range selection 5 Range key – Memory/Measuring range
6 Low Battery 6 MEM – Memory key
* SECULIFE IT 5032 B USB with automatic
backlight in HOLD function
Hintergrundbeleuchtung.in der „Hold“-Funktion.

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3 Functioning of the SECULIFE IT
3.1 Preparation
First remove the snap-on cover of the battery compartment at the back of the meter. Insert the battery
included in the delivery contents (1.5 V size AA, IEC LR6) in the battery compartment.
Care should be taken to place the battery correctly according
to the polarity indications “+“ and “-“ in the battery compartment.
When the battery warning symbol ( ) appears in the display,
the battery must be replaced.
The values in the measuring data memory and also the preset
individual values will be maintained, even when the battery is changed.
3.2 Duration of Display –Continuous Operation
If for approx. 4 minutes none of the keys of the SECULIFE IT is pressed down, the instrument will be
turned off automatically. When the instrument is switched off, the values stored in the measuring data
memory and also the preset individual values will be maintained.
You can override the automatic switch-off, when you switch on the instrument and simultaneously keep
the HOLD key pressed down. The measuring unit „lx / fc“ in the display will blink and indicate that the
Continuous Operation Mode is on.

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4 SECULIFE IT Operation
4.1 Switch On –Make Measurement
Press down the on/off key and the SECULIFE IT will start up in measuring mode and will immediately be
measuring at 2 times per second. The instrument is in the function „AUTO“, i.e. the SECULIFE IT will
select the best suited measuring range for the existing light level. By pressing one of the range keys, one
of the measuring ranges can be set. Scrolling up or down through additional measuring ranges is
accomplished by briefly pressing one of the range keys. If both keys are pressed and held simultaneously,
the instrument is returned to „AUTO RANGING“.
4.2 Selecting the Measurement Unit lx or fc –cd/m² or fL
Use the key lx/fc to select the required unit for the read-out – lux or footcandle. With the additional
Luminance Attachment (please refer to 6.2 – Optional accessories), this key also selects the measurement
unit for luminance cd/m² or fL – candela per square meter or footlambert.
4.3 Overload Display –Zero Point Indication
When exceeding one of the measuring ranges „OL“ (Overload)
appears in the display.
The zero point indication may be achieved by putting the protective
cap over the light collector of the photometer head.

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4.4 Memory Functions
In addition to the display buffer storage, the SECULIFE IT has also been provided with a memory space
for up to 100 measured values.
This function allows the user to make several measurements in the field and then to view them later. The
data stored in the memory will be maintained, even if the meter is turned off or if the battery is changed.
4.4.1 „HOLD“ - Display Hold Function
The SECULIFE IT has been equipped with a Display HOLD Function in order to enable you to make
measurements in very low light conditions and to read them out later in brighter light conditions.
The latest measurement will be buffer-stored in the display by striking the HOLD key. Then “HOLD” will
appear in the display. Pressing down the HOLD key again will prompt the SECULIFE IT to return to the
measuring function.
The function HOLD is the basic function for all the memory functions.
Hold

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4.4.2 „Mem“ – Save Measured Values in Memory
The measurement measured value which is to be saved will be
maintained by the Hold key in the display and may be filed onto
the next free memory space by pressing down key Mem. Then,
for a few seconds, the display shows the saved measured value
alternating with the number of the memory space.
After that, the SECULIFE IT returns into the measuring mode. If
the memory space is filled with all 100 memory spaces, then the
display will show “FLL”.
Hold
Mem

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4.4.3 „Mem-Edit“ – Overwrite a Saved Measured Value
The SECULIFE IT offers the function „Mem Edit“ for correcting a
stored value in the memory. Measure again, press the Hold key
and the new value is logged in. Then, by pressing one of the
range keys, you can scroll through the memory.
At the memory space to be
corrected press down the key Mem.
Then the display shows the saved
value for a few seconds alternating
with the number of the memory
space. Subsequently the
SECULIFE IT will return to
measuring mode.
Hold
Mem