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Fax: ++49 (0) 911 96 26 05-9
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e-mail:
www.
stepsystems.de
6.2 Taking measurements
To take measurements proceed as follows:
1.
Using the LUX/FC key, select the desired unit, where LUX, or lx, is the current unit in Europe. FC
stands for ft-cd, an 'obsolete' unit, which nevertheless continues to be used in some English-speaking
countries. Convert as follows: 1 ft-cd = approx. 10 lx = 1 lm (lumen) per m2.
2.
Select the light source to be measured. There are four switchable benchmark levels to choose from:
1 = Tungsten or Sun - filament lamps or sunlight/day-light at 2856K
2 = Fluorescent - fluorescent lamp light
3 = Sodium - light from a sodium vapour lamp (orangeemitting light, street flood)
4 = Mercury - light from a mercury-vapour lamp (whiteemitting light, lantern)
Caution!
If the setting is incorrect, a false benchmark filter will be taken as a basis and errors in measurements may
occur.
3.
Use the measurement range switch to select the measurement range expected. Example: in a
secretarial or drawing office, illumination levels of up to 2000 lx are possible. If '----' is shown instead of a
measurement, then the measurement range is too low, so select the next higher range. If '____' is shown
instead of a measurement, then the measurement range is too high, so select the next lower range.
4.
Position the sensor as directly under the light source as possible and read off the illumination level.
5.
As the display is 3-1/2 digits, a max. measured value of 1999 lx can be displayed. In the 20000-lx
range, the last digital place will therefore be displayed in the form '0' in the subdisplay beneath
corresponding to the factor 10. The value read off in the 20000-lx range must therefore be multiplied
by 10. And in the 100000-lx range the last digital place will be displayed in the form '00' in the sub-display
corresponding to the factor 100. The value read off in the 100000-lx range must therefore be multiplied by
100.
6.3 How to use the data 'Hold' function
When taking measurements, if you want to capture a 'stationary' value from relatively fast changing data,
operate the HOLD key once. That will hold the instantaneous value. The symbol D.H. appears at the
same time on the top line of the display. To leave the Hold function or to revert to instantaneous
measurement,
operate either the Hold key again or change the measurement range, or switch the instrument off. During
the Data Hold function the other keys are inoperative.
6.4 How to use the RECORD/RECALL to record measurements
Using the RECORD key starts recording and storing the measurement of the minimum (MIN), maximum
(MAX) and average (AVG) values.
Using the RECALL key you can retrieve the minimum (MIN), maximum (MAX) and average (AVG) values
in turn at any time. To terminate recording measurements, operate the RECORD key again once and you
will return to instantaneous measurement.
Whilst recording a measurement, the following symbols will appear at the bottom left of the display: REC
(start of recording), Max (maximum value), Min (minimum value) and AVG (average value).
Caution!
The average value is not the algebraic sum of the Min. + Max values divided by 2. The LIGHT SOURCE,
LUX/FC and ZERO keys are inoperable when recording a measurement.
6.5 Auto power-off function
During normal measurement the instrument automatically switches off after about 10 minutes without
operation of the keys to save power. This automatic switching is not active when the instrument is in the
recording mode.
6.6 Table for different levels of illumination
By means of the external sensor you can monitor the illumination at particular points along different angles
whilst the instrument itself continues to remain in the same position. In the same way the effect of
individual luminaries and their beam angles can easily be determined at any desired point. As an
indication, the table below gives some optimal levels of illumination for typical environments:
Summary of Contents for 32020
Page 9: ...Optimal Lux Values Table ...
