
Part Number: 210112 • Revision Level: A • Specifications subject to change without notice
While sophisticated and powerful, the SL-3101 is a user-friendly instrument allowing for simple
“plug-and-play” operation.
QUICK START GUIDE INSTRUCTIONS
Scotopic / Photopic Specialty Meter
Model SL-3101
Measures Illumination According to the Dark and Light
Luminous Efficiency Curve of the Human Eye
To access the complete user manual, please visit the
“Literature & Downloads” section at www.solarlight.com/product/spmeter
METER OPERATION
1 To operate the meter, simply connect the
sensors.
2 Turn the meter on by pressing the ON/OFF
key.
3 Zero out the readings by placing the sensors
upside down on a flat opaque surface, so
that the sensors are covered and not exposed
to light. Read the display. If the readings are
not zero, or fluctuating around zero, press
the Zero key. This step can be skipped once
you know the characterization of your
sensors. If they always read zero, then this
step can be skipped.
4 Point the sensors at the desired source.
5 Read the meter.
DISPLAYING CALCULATED VALUES
Press the Calc key to display the Visual Effective,
Brightness and S/P Ratio calculated values. These
values are in a continuous loop by pressing the
Calc key.
To show both photopic and scotopic readings at the
same time, press the Actual key.
Pressing the Units key toggles the units from
lux to
foot candles (fc).
MEASURING WITH SL-3101
To perform measurements with a SL-3101, the
following steps should be followed:
1 Power ON the SL-3101 by pressing the
button. If the meter does not respond, attach
the optional external power supply. The unit
will be powered ON whenever connected to
the external power supply. The SL-3101 will
turn itself OFF after 3 minutes of inactivity if
no sensor is attached.
2 Plug the selected sensor into the sensor
input located on the side of the meter. The
meter will indicate the connection by two
beeps and the display will show the
measurement result. Squeeze the locking
arms of the sensor plug while connecting or
disconnecting it.
3 In order to turn the SL-3101 OFF press the
ON/OFF key. If the unit is connected to
external power, it will remain powered up and
pressing the ON/OFF will have no effect.